Cadillac DTS Forum - 2006 through 2012 Discussion, 2007 DTS Performance Lean Air reading, torn plenum, bad fuel injectors? in Past Cadillac Vehicle Discussion; Have had lean air reading (code po171 lean, p0a01 bank 1 sensor 2, p0174 bank 2 lean) for 25 K ...
2007 DTS Performance Lean Air reading, torn plenum, bad fuel injectors?
Have had lean air reading (code po171 lean, p0a01 bank 1 sensor 2, p0174 bank 2 lean) for 25 K miles.. Took to my shop 3
times until they told me to go to GM. Had sensors replaced, but engine lite still. Took to dealer and was told
plenum leaks. Paid $500 to replace. Lite back on next day. Dealer said rear O2 senssor still reading MV but may drop after
CAT cleans out. Took back to local shop, who I trust, and they think fuel injectors need replaced. Any ideas?
You have a vacuum leak. Whoever replaced sensors (what sensors?), and whoever's suggesting injectors, doesn't know what they're doing.
You (or a competent shop) needs to start looking for a decent size vacuum leak. The EGR line grommet going into the intake manifold is prone to cracking, but someone SHOULD have noticed that when the plenum was replaced.
I had the same issued this week. The air intake bolts were loose take a look at that another thing because these car do not longer have a pcv valve the valve cover work as a pcv valve. If the valve cove gasket is bad it will pull air in to the intake. But only will give you one of the backs code. Also check the maf sensor it could be going bad but it hasn't giving you a code.
Re: 2007 DTS Performance Lean Air reading, torn plenum, bad fuel injectors?
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) - (Aug 28, 2012)
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: 2005-2013 GM Passenger Cars and Light Duty Trucks
Equipped with Engine RPOs listed in the Table Below and MULTEC® 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.
This bulletin is being revised to update the model years to 2013 and to update Applicable Engine RPOs table. Please discard Corporate Bulletin Number 03-06-04-030G (Section 06 – Engine/Propulsion System).
Some customers may comment on any of the following various driveability symptoms:
• Extended Crank Time
• Hard to Start
• MIL/SES Illuminated with DTCs
• Lack of Power
• Surge or Chuggle
• Rough Idle
• Light or Intermittent Misfire
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.
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 latest version of the following Corporate Bulletin Numbers:
• 04-06-04-047 (U.S. Only)
• 05-06-04-022 (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 88861803 (in Canada, P/N 88861804)
• * One bottle of GM Fuel System Treatment Plus, P/N 88861013 (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 1-800-GM-TOOLS (1-800-468-6657) 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®) 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® 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.
To access the training video on AFIT, take the following path at the GM Training Website:
1. After logging into the gmtraining.com 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 gmtraining.com 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) on the web at http://www.gmde.net/AFIT.cfm.
To access the training video on AFIT, take the following path at the GMPro LMS Training Website:
1. After logging into the <www.gmprocanada.com> 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) on the web at http://www.gmde.net/softwareupdates/.
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 GlobalConnect.
2. Click on the Service Tab in GM GlobalConnect (in Canada, click Technician 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.
• Click on 7-2010 in the Archives Section and Click on AFIT Adapter for Direct Injection Engines and Duramax Diesels in the July 2010 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 88861013 [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.
Description Qty 1 88861803 GM Upper Engine and Fuel Injector Cleaner 473 ml (16 oz) Container (U.S.)
QTY 1 88861804 GM Upper Engine and Fuel Injector Cleaner 473 ml Container (Canada)
QTY 1 88861013 Fuel System Treatment Plus 591 ml (20 oz) Container (U.S.)
QTY 1 88861012 Fuel System Treatment Plus 591 ml Container (Canada)
Re: 2007 DTS Performance Lean Air reading, torn plenum, bad fuel injectors?
Tom3998, I'm sorry you've been having these persistent concerns! Have you been in touch with our Cadillac Customer Assistance Center at any part of the process? Please don't hesitate to email me at Katie_Lucille@gmexpert.com for further assistance, although I understand if you're seeking only DIY input from other owners.