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Discussion Starter #1
I recently purchased a 2008 TBSS 2wd. I noticed it had a slightly rough idle, but felt pretty much the same as other TBSS I had test driven before. I hooked up my dash hawk and there were no trouble codes or signs of misfires. I thought everything was ok.
I then purchased a PCMforLess stage 2 kit (intake for stock maf and airbox, grounding kit, 160 thermostat, electric fans and tune). Install went fine, fans work great, no problems. Start the car and do a short test drive, and get a check engine light. I scan it with my dash hawk and get a p0171 & p0174. I contacted PCMforLess and was told to clean the MAF and check for leaks. Followed their recommendations, cleared the codes and went for another test drive. The CEL popped back up.
I did a log of my drive and noticed that trims were fine except at idle. STFT was less than 4% long terms were the same. At idle though, LTFT's would shoot up to as high as 30% and STFT up to 8%. As soon as I started cruising again the trims would come back into check. I logged the MAF sensor and it stayed within check.
I did some searching and have verified that the plug is still in the block for the dipstick, and I have ran top end cleaner through the motor to try and fix some of the common causes of lean codes.
Does anyone have any other ideas what I may be missing? PCMforLess told me to send the comp back to them for a retune, but this was before I noticed the issues with fuel trims. I have tried to contact them for the last two days with no response. I am really trying to avoid having additional down time if I can.
 

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07 TBSS 1SS AWD
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did you fog the thing with propane or carb cleaner around the intake to see if you have a vacuum leak?




DTC P0171, P0172, P0174, or P0175
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0171: Fuel Trim System Lean Bank 1

DTC P0172: Fuel Trim System Rich Bank 1

DTC P0174: Fuel Trim System Lean Bank 2

DTC P0175: Fuel Trim System Rich Bank 2


Circuit/System Description
The engine control module (ECM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy, and emission control. Fuel delivery is controlled differently during Open Loop and Closed Loop (CL). During Open Loop, the ECM determines fuel delivery based on sensor signals without heated oxygen sensor (HO2S) input. During CL, the ECM adds HO2S inputs and level of purge to calculate the short and long term fuel trim (FT) adjustments. If the HO2S indicates a lean condition, the fuel trim values will be above 0 percent. If the HO2S indicates a rich condition, the FT values will be below 0 percent. The short term FT values change rapidly in response to the HO2S voltage signals. The long term FT makes coarse adjustments in order to maintain an optimum air/fuel ratio. A block of cells contain information arranged in combinations of engine RPM and engine load for a full range of vehicle operating conditions. The long term FT diagnostic is based on an average of cells currently being used. The ECM selects the cells based on the engine speed and load. The FT diagnostic will conduct a test to determine if a rich failure actually exists or if excessive vapor from the evaporative emission (EVAP) canister is causing a rich condition.

If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets. If the ECM detects an excessively rich condition, DTC P0172 or P0175 sets.

Conditions for Running the DTC
• DTCs P0030, P0036, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0117, P0118, P0120, P0121, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0201-P0208, P0220, P0300, P0301-P0304, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P1106, P1107, P1114, P1115, P1133, P1516, P2101, P2119, P2120, P2125, P2135, P2138, P2176 are not set.

• The engine is in Closed Loop status.

• The engine coolant temperature (ECT) is between -40 and +150°C (-40 and +302°F).

• The intake air temperature (IAT) is between -20 and +150°C (-4 and +302°F).

• The manifold absolute pressure (MAP) is between 10-255 kPa (1.45-37 psi).

• The vehicle speed is less than 134 km/h (83 mph).

• The engine speed is between 375-7,000 RPM.

• The mass air flow (MAF) is between 1-510 g/s.

• The barometric pressure (BARO) is more than 70 kPa (10.2 psi).

• The fuel level is more than 10 percent.

• This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC
• The average long term FT weighted average value is more or less than a calibrated value.

• The above condition is present for approximately 3 minutes after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second ignition cycle the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. The control module illuminates the malfunction indicator lamp (MIL) when one of the following occur:

• The control module detects the same fuel trim failure during 2 consecutive trips.

• The control module detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria:

- The engine load is within 20 percent of the previous test that failed.

- The engine speed is within 375 RPM of the previous test that failed.

- The engine coolant temperature is in the same range of the previous test that failed.

Conditions for Clearing the MIL/DTC
• The control module turns OFF the malfunction indicator lamp (MIL) at the beginning of the fourth ignition cycle, after 3 ignition cycles that the diagnostic runs and does not fail.

• A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

• A history DTC and related Freeze Frame data clears after 40 warm-up cycles, if no failures are reported by this or any other emission related diagnostic.

• Clear the MIL and the DTC with a scan tool.

Reference Information
Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification
Important: Disregard any transmission symptoms, antilock brake system (ABS) indicators, and traction control system (TCS) indicators until any fuel trim faults are repaired. A fuel trim fault may cause default actions such as harsh shifts and illumination of the ABS/TCS indicators.

• Verify that other DTCs are not set.

⇒ If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

• Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.

⇒ If the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132, P0137, or P0138, DTC P0133, P0134, P0140, P1133, P2270, P2271, P2A00, or P2A01, DTC P0151, P0152, P0157, or P0158, or DTC P0153, P0154, P0160, P1153, P2272, P2273, P2A03, or P2A04.


Important: EVAP purge enablement may cause the FT to be momentarily outside the normal range.


• The normal Short Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.

• The Long Term FT parameter should be between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.

• Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing
P0171 or P0174
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between 0-19 percent.

⇒ If not within the specified range, inspect for the following:

• With the ignition ON and the engine OFF, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor pressure should be within the range specified for your altitude. Refer to Altitude Versus Barometric Pressure.

⇒ Refer to DTC P0106 if the MAP sensor does not indicate the correct barometric pressure.

• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.

⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.

• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.

• Insufficient fuel in the tank

• Low fuel pressure--Refer to Fuel Pump Electrical Circuit Diagnosis.

• Fuel contamination--Refer to Evaporative Emission System Diagnosis.

• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.

• Missing, loose, or leaking exhaust components from the HO2S forward--Refer to Diagnostic Starting Point - Engine Exhaust.

• Vacuum leaks at the intake manifold, the throttle body, and the injector O-rings

• The air induction system and the air intake ducts for leaks or for a missing air filter element

• A cracked EVAP canister

• Evaporative pipes obstructed or leaking--Refer to Fuel Hose/Pipes Routing Diagram.

• The crankcase ventilation system for leaks

• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system

• The HO2S signal circuit open, shorted to ground, or shorted to the low reference circuit

• Malfunctioning engine components--Refer to Symptoms - Engine Mechanical.

• Ethanol concentration greater than 15 percent-Refer to Alcohol/Contaminants-in-Fuel Diagnosis.

P0172 or P0175
Allow the engine to reach operating temperature. With the engine running, observe the affected Long Term FT parameter with a scan tool. The reading should be between -19 and 0 percent.

⇒ If not within the specified range, inspect for the following:

• With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.

⇒ Refer to DTC P0106 if the MAP sensor parameter is not between 19-42 kPa.

• With the engine idling, observe the mass air flow (MAF) sensor parameter. The MAF sensor parameter should be within 2-6 g/s at idle.

⇒ Refer to DTC P0101 or P1101 or DTC P0102 or P0103 if the MAF sensor parameter is not within 2-6 g/s at idle.

• Vacuum hoses for splits, kinks, and improper connections--Refer to Evaporative Emissions Hose Routing Diagram.

• The air intake duct for being collapsed or restricted

• The air filter for being dirty or restricted

• Objects blocking the throttle body

• Excessive fuel in the crankcase due to leaking fuel injectors

• The evaporative emissions control system for improper operation--Refer to Fuel Hose/Pipes Routing Diagram.

• Excessive fuel pressure--Refer to Fuel Pump Electrical Circuit Diagnosis.

• Malfunctioning fuel injectors--Refer to Fuel Injector Diagnosis.

• Fuel contamination--Refer to Evaporative Emission System Diagnosis.

• The HO2S for improper installation and for electrical wires or connectors that may have contacted the exhaust system

• The HO2S signal circuit shorted to voltage

Repair Instructions
• Air Cleaner Assembly Replacement

• Air Cleaner Element Replacement

• Air Cleaner Resonator Outlet Duct Replacement

• Evaporative Emission Canister Purge Solenoid Valve Replacement

• Evaporative Emission Canister Replacement

• Evaporative Emission Canister Vent Solenoid Valve Replacement

• Evaporative Emission Hose/Pipe Replacement - Chassis

• Fuel Hose/Pipes Replacement - Chassis

• Evaporative Emission Hoses/Pipes Replacement - Engine

• Fuel Injector Replacement

• Fuel System Cleaning

• Fuel Tank Draining

• Fuel Sender Assembly Replacement

• Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 1

• Manifold Absolute Pressure Sensor Replacement

• Mass Airflow Sensor/Intake Air Temperature Sensor Replacement

• Accelerator Pedal Position Sensor Replacement

Repair Verification
Important:

• After repairs, use the scan tool Fuel Trim Reset function in order to reset the Long Term Fuel Trim.

• To verify the performance of the catalytic converter has not been affected by the condition that set this DTC, perform the Repair Verification for DTC P0420 or P0430. Refer to DTC P0420 or P0430.


Install any components or connectors that have been removed or replaced during diagnosis.
Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
Turn ON the ignition, with the engine OFF.
Important: DO NOT clear codes with the engine running. The codes may reset in the same ignition cycle.

Clear the DTCs.
Turn OFF the ignition for 60 seconds.
Start the engine.
Duplicate the Conditions for Running the DTC and use the Freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets, or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.



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Discussion Starter #4
I have not fogged the intake yet. I will do that next.

The only parts that have changed are the entire intake tract up to the throttle body. I have taken the pcv valve off and placed the k&n breather in place per the instructions from Pcmforless. I can watch the vacuum with the dash hawk, at idle I get approx 18 pounds, on decel 22 psi and 14ish during cruise. I would assume that a huge leak could either be heard, or would show up as low vacuum on the gauge.

Let me go try fogging the intake and see what I can find out.
 

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TrailblazerSS
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Discussion Starter #5
As a side note I noticed these two connectors disconnected and I can seem to locate where they belong
On top of the intake manifold

Just to the right(when looking into the engine bay) of the brake booster
 

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The first connector is the leftover connector for trucks with AFM its suppose to be disconnected since our trucks don't have that feature.

Did you by chance have the TB off when you did the intake to clean it? Could be leaking around the seal.

Can you monitor o2 voltages? might have a dead o2 sensor.
 

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Discussion Starter #8
I didn't take the throttle body off, although I did notice it was pretty dirty behind the throttle plate. I attempted to propane the intake manifold and intake piping. I didn't see any changes in trims or idle quality. I am going to try again this am though as my tank was on the low side. I did a search and read the throttle body controls idle, i.e. No ics. Is there a way you disable this function, or should I still be able to notice the difference with everything in place.

I have monitored the o2 sensors. They correspond with the trims. At idle they bounce around in the 500's (don't quote me could have been higher), and as the trims start rising the voltage drops to double digits. As I begin to drive and the trims correct themselves, the o2 voltage does the same. It does this on both sides with the voltages being almost identical.
 

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secret squirrel
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along with two tons of fun...i found this........

TECHNICAL

Bulletin No.: 03-06-04-030G

Date: April 22, 2009
Subject:
Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT CH-47976)

Models:
2005-2009 GM Passenger Cars and Light Duty Trucks
2005-2009 HUMMER H2
2006-2009 HUMMER H3
2005-2009 Saab 9-7X



Equipped with Engine RPOs listed in the Table above and MULTEC(R) 2 Fuel Injectors
Attention:
GM does not support cleaning injectors on any engines that are not listed in this bulletin. Engines other than the ones listed in this bulletin that diagnosis indicates having restricted injectors should have those injectors replaced.

Supercede:
This bulletin is being revised to update the model year to 2009 and to provide applicable engine RPO table. Please discard Corporate Bulletin Number 03-06-04-030F (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on any of the following various driveability symptoms:
- Extended Crank Time

- Hard to Start

- MIL/SES Illuminated with DTCs

- Hesitation

- Lack of Power

- Surge or Chuggle

- Rough Idle

- Light or Intermittent Misfire

Cause

Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms.

Correction

Fuel injector restrictions, deposits can be cleaned on the vehicle using the following procedure. Under NO circumstances should this procedure be modified, changed or shortened. As a long term solution, and to prevent reoccurrence, customers should be encouraged to use Top Tier Detergent Gasoline. For further information on Top Tier detergent gasoline and fuel retailers, please refer to the following Corporate Bulletin Numbers:
- 04-06-04-047G (U.S. Only)
- 05-06-04-022D (Canada ONLY)

Notice
GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent approved for use with General Motors fuel system components. Other injector cleaners may cause damage to plastics, plated metals or bearings. General Motors has completed extensive laboratory testing of GM Upper Engine and Fuel Injector Cleaner, and can assure its compatibility with General Motors fuel system components, as long as the cleaning procedure is followed correctly.

Injector Cleaning Procedure

The following tools, or their equivalent, are required:
- CH-47976 Active Fuel Injector Tester (AFIT)
- J 35800-A Fuel Injector Cleaner
- J 37287 Fuel Line Shut-off Adapter
- J 42964 Fuel Line Shut-off Adapter
- J 42873 Fuel Line Shut-off Adapter
- * One bottle of GM Upper Engine and Fuel Injector Cleaner, P/N 88861802 (in Canada, P/N 88861804)
- * One bottle of GM Fuel System Treatment Plus, P/N 88861011 (in Canada, P/N 88861012)

Active Fuel Injector Tester (AFIT- CH-47976)

Some dealers may not have an Active Fuel Injector Tester (AFIT- CH-47976). Dealers can contact to order an AFIT- CH-47976. Dealers still can test the fuel injectors without an AFIT. Refer to Fuel Injector Diagnosis (w/ J 39021 or Tech 2(R)) in SI.
Important
As mentioned in the AFIT User Guide, vehicles that are not listed in the AFIT menu can still be tested with the AFIT. Depending on the model, it may be possible to enter the previous model year and proceed with testing using the DLC connection. If this is not possible on the model that you are working on, it will be necessary to use the direct connection method outlined in the AFIT User Guide (See Pages 17-31).

General Motors recommends that the Active Fuel Injector Tester (AFIT) be used in testing fuel injectors. If the SI diagnostics do not isolate a cause for this concern, use the Active Fuel Injector Tester (AFIT - CH-47976) to perform an "Injector Test" as outlined in the AFIT User Guide.

The AFIT "Injector Test" measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2(R) fuel injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC (for example: if it is being caused by a fuel injector concern).

The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down. Also, as mentioned in the P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the concern. Refer to Fuel Injector Diagnosis (w/CH-47976) in SI for additional instructions.

Training (U.S.)

To access the training video on AFIT, take the following path at the GM Training Website:
1. After logging into the training website, choose the link on the left side of the page titled "web video library."

2. Then choose "technical."

3. Next, within the search box, type in September course number "10206.09D.

4. This will bring up a link with this course. Scroll through to choose "feature topic."

5. At this point, the seminar can be chosen to view or the video related to the AFIT.

Additional training is available from the training website. Please see TECHassist 16044.18T2 Active Fuel Injector Tester and also see 16044.14D1 GM Powertrain Performance for more information on GM Upper Engine and Fuel Injector Cleaner.

Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE).

Training (Canada)

To access the training video on AFIT, take the following path at the GMPro LMS Training Website:
1. After logging into the website, choose the link on the left side of the page titled "Catalog."

2. Then choose "Catalog Search."

3. Next, within the search box, Select Course Number - Contains - "T" then select search.

4. This will bring up a list of TECHassist courses. Scroll through to choose "Active Fuel Injector Tester" and select "View."

5. At this point, a new window will open and the program can be Launched.

Also, dealers can now download software updates for the AFIT at GM Dealer Equipment (GMDE).

Techlink

Additional information can be found on AFIT (June 2006 Edition) and GM Upper Engine and Fuel Injector Cleaner (November 2006 Edition) in Techlink. To access the articles, take the following path:
1. Go to GM DealerWorld (U.S.) or the GM GlobalConnect (Canada).

2. Click on the Service Tab in DealerWorld (in Canada, click Technican Resources in the Service Library of GM GlobalConnect).

3. Click on the GM Techlink Hyperlink.

4. Click on the Archives Hyperlink at GM Techlink.

- Click on 06-2006 in the Archives Section and Click on the Active Fuel Injector Tester Link in the June 2006 Techlink Article.

- Click on 11-2006 in the Archives Section and Click on the GM Top Engine Cleaner Replaced Link in the November 2006 Techlink Article.

Injector Cleaning Procedure
Notice
GM UPPER ENGINE AND FUEL INJECTOR CLEANER is the only injector cleaning agent recommended. DO NOT USE OTHER CLEANING AGENTS AS THEY MAY CONTAIN METHANOL, WHICH CAN DAMAGE FUEL SYSTEM COMPONENTS. Under NO circumstances should the GM Upper Engine and Fuel Injector Cleaner be added to the vehicle fuel tank.

Do not exceed the recommended cleaning solution concentration. Testing has demonstrated that exceeding the recommended cleaning solution concentration does not improve the effectiveness of this procedure.
Important
Vehicles with less than 160 km (100 mi) on the odometer should not have the injectors cleaned. These vehicles should have any out of specification injectors replaced.

1. For 4, 5 and 6 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) mixed with 420 ml (14 oz) of regular unleaded gasoline.

2. For 8 cylinder engines, empty two of the 30 ml (1 oz) reservoirs of the GM Upper Engine and Fuel Injector Cleaner container into the J 35800-A - Injector Cleaning Tank then add 420 ml (14 oz) of regular unleaded gasoline. If you are using any other brand of cleaning tank, you will need a total of 60 ml (2 oz) of Upper Engine and Fuel Injector Cleaner mixed with 420 ml (14 oz) of regular unleaded gasoline. This procedure will need to be repeated for a second time for an 8 cylinder engine (8 cylinder engines receive 960 ml total fluid - 120 ml (4 oz) of Upper Engine and Fuel Injector Cleaner and 840 ml (28 oz) of gasoline.

3. Be sure to follow all additional instructions provided with the tool.

4. Electrically disable the vehicle fuel pump by either removing the fuel pump fuse or the fuel pump relay and disconnecting the oil pressure switch connector, if equipped.

5. Turn the ignition to the OFF position.

6. Relieve fuel pressure and disconnect the fuel feed and return lines at the fuel rail. Plug the fuel feed and return lines coming off the fuel rail with J 37287, J 42873 or J 42964 as appropriate for the fuel system.

7. Connect the J 35800-A to the vehicle fuel rail.

8. Pressurize the J 35800-A to 510 kPa (75 psi).

9. Start and idle the engine until it stalls, due to lack of fuel. This should take approximately 15-20 minutes.

10. Turn the ignition to the OFF position.

11. Disconnect the J 35800-A from the fuel rail.

12. Reconnect the vehicle fuel pump relay and oil pressure switch connector, if equipped.

13. Remove the J 37287, J 42873 or J 42964 and reconnect the vehicle fuel feed and return lines.

14. Start and idle the vehicle for an additional two minutes to ensure residual injector cleaner is flushed from the fuel rail and fuel lines.

15. Pour the entire contents of GM Fuel System Treatment Plus (P/N 88861011 [in Canada, P/N 88861012]) into the tank and advise the customer to fill the tank.

16. Review the benefits of using Top Tier Detergent gasoline with the customer and recommend that they add a bottle of GM Fuel System Treatment Plus to the fuel tank at every oil change. Regular use of GM Fuel System Treatment Plus should keep the customer from having to repeat the injector cleaning procedure.

17. Road test the vehicle to verify that the customer concern has been corrected.



Parts Information

* Only 1/8 of the cost may be claimed for 4 and 6 cylinder engines and 1/4 of the cost for 8 cylinder engines.

Warranty Information (excluding Saab U.S. Models)



For vehicles repaired under warranty, use the table above.

Warranty Information (Saab U.S. Models)



For vehicles repaired under warranty, use the table above.



Disclaimer


 

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i say take throttle body cleaner and spray around the intake manifold and watch the fuel trims if you spray by a spot and the car trys to die your itnake manifold gaskets are leaking.
 
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