: Check engine light 500 miles from home
02-28-13, 12:09 AM
I looked at the suggested posts from other members and pulled off cover over intake manifold. Sure enough, the 4 bolts on each corner of intake mainfold :bouncy:were hand tightened. Went back and tightened them up to 7FT lbs.
My 2006 DTS with 47K hase been a gem since I picked it up with 28K last July. I was up in Baltimore on business and came out of a meeting and as I drove away , Check engine light came on as I headed back to Charleston,SC..
Ran a little rough so I headed to Auto Zone and hooked up OBDII scanner. Threw codes 171 & 174. I put new air filter (24000k 5/11/11)
last time it was replaced & can of Techron. I had been using 87 fuel for quite a while & filled up with 93 octane.
I drove about 300 miles and stopped to lunch. When I came back to the car the light was off!!
Plus my mileage was 1.5 MPG better
02-28-13, 07:24 AM
P0171 and P0174 is LEAN on both banks...
Air filter MAY have caused that... but I doubt it.
Both of those codes at the same time, usually mean it has a vacuum leak.
There have been instances of the intake bolts being loose...
May want to check them...
Clogged Fuel Injectors wall cause a p0171-p0174 making it run LEAN. By going with top tier
Gas and driving 300 miles it help clean the injectors.
A new class of fuel called TOP TIER Detergent Gasoline is appearing at retail stations of some fuel marketers. This gasoline meets detergency standards developed by six automotive companies. All vehicles will benefit from using TOP TIER Detergent Gasoline over gasoline containing the “Lowest Additive Concentration” set by the EPA. Those vehicles that have experienced deposit related concerns may especially benefit from the use of TOP TIER Detergent Gasoline.
What is TOP TIER Detergent Gasoline?TOP TIER Detergent Gasoline is a new class of gasoline with enhanced detergency. It meets new, voluntary deposit control standards developed by six automotive companies that exceed the detergent requirements imposed by the EPA.
Where Can TOP TIER Detergent Gasoline Be Purchased?
The TOP TIER program began on May 3, 2004 and many fuel marketers have joined the program and have introduced TOP TIER Detergent Gasoline. This is a voluntary program and not all fuel marketers will offer this product. Once fuel marketers make public announcements, they will appear on a list of brands that meet the TOP TIER standards.
Where Can I find the Latest Information on TOP TIER Fuel and Retailers?
On the web, please visit www.toptiergas.com for additional information and updated retailer lists.
Who developed TOP TIER Detergent Gasoline standards?
TOP TIER Detergent Gasoline standards were developed by six automotive companies: Audi, BMW, General Motors, Honda, Toyota and Volkswagen.
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02-28-13, 06:31 PM
Jim is right I had the same problem it was all the bolt of the intake loose.
03-02-13, 10:19 AM
Yeah that ^^^^ ANY air leak at or after the divorced MAF will set mixture codes. Check all intake ducting clamps as well as all vacuum lines to/from the throttlebody/PCV as well as the intake manifold bolts - and be careful with those bolts - torque is only 89 lb/in, about 7.5 lb/ft.
lohimike, I lived on Isle of Palms in the 60's and 70's when I was on sub duty in Charleston. Missile boats. Charleston/Mt.Pleasant is a totally different world now. Was on I of P for Thanksgiving.
03-02-13, 08:16 PM
I used to fly in to CHS AFB in the 80's for Reserve duty. Used to take my troops down to the Naval yard for boat tours. Went on a Spruance destroyer andLos Angeles atack sub. Good interservice visit.
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) 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: 2005-2013 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).
Applicable Engine RPOs
LH6, LS2, LQ4, LM7, LR4, L33, LQ9, L31, LU3, LL8, LK5, L52, L18
LH6, LS2, LQ4, LM7, LR4, L33, LQ9, L31, LU3, LL8, LK5, L52, L18
LH6, LS2, LQ4, LM7, LR4, LY2, LY5, L76, L92, LU3, LLR, LLV, LL8, L18
LH8, LS2, L92, LY2, LY5, LY6, LH6, LFA, LU3, L18
LH8, LS2, LH6, LY2, LFA, LY5, LU3, L18
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)
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03-07-13, 10:48 AM
Thanks for the replys on my 06 DTS kicking codes out last week. I pulled the cover off this weekend and all 4 corner bolts were could be tightened by hand. Tightened down to 7 ftlbs. good to go.
Great Catch & Thanks again forum!!!!
Cadillac Cust Svc
03-07-13, 01:19 PM
Lohimike, it's great that the forum members were able to provide feedback you found helpful! If you have any further questions along the way, please don't hesitate to let me know. I'm reachable via email at Katie_Lucille@gmexpert.com.
Cadillac Customer Service