× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 26, 2007
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1990 Cadillac DeVille 4.5L Cuts out VIN: 1G6CD1337L
Thanks to all in advance! It has been some time since we worked on one of theese and this has me stymied! Intermittantly the car will seem to loose ignition, come back to life and blow the muffler off! It happens mostly cruising on the highway and acts like th...
1999 Cadillac Catera 3.0L Misfire VIN: W06VR52RSX
Single cylinder misfire (#3) under light to moderate load . just as the approach to a hill is encountered. This feels just like a spark exiting the boot and not firing in the combustion chamber. It can be seen in misfire datastream . Can not duplicate in the s... Trouble codes: P0303 (only set the code once misfire cylinder 3)
2000 Cadillac Catera 3.0L Misfire, MIL Lamp on VIN: W06VR548YR
Cadillac Catera experts please help!First time customer brought vehicle in with CEL light on complaint.When I pulled vehicle in the service bay CEL light was flashing-retrieved codes P0300-P0301-P0303-P0305.Engine felt like had a misfire although not like all ... Trouble codes: P0300 (random cyl misfire), P0301 (cyl 1 misfire), P0303 (cyl 3 misfire), P0305 (cyl 5 misfire)
2002 Cadillac Eldorado ESC 4.6L temp door VIN: 1G6EL12Y72
Greetings to all,this eldorado has dual climate control for the interior you set the passenger side at 80 degrees and you still get cold air .The drivers side works ok.I did test to see if I was getting a voltage signal to the motor when you change the temp se...
1994 Chevrolet Corsica 3.1L suspension VIN: 1G1LD55M4R
has any one had one of these-- it is very well kept city car-- very low mileage--and almost new front end-- i can get it to pop on either side by going forward-stopping turn wheel slightly and go to reverse--or from reverse to forward-- some times---also just ...
2000 Chevrolet Blazer LS 4.3L 4 wheel drive
Hi Just Like To Ask If there Is A Seprate DLC For The 4 Wheel Drive Module To Pull Codes. Mitchell says to use pin # 13. I Found the OBD 11 DLC But Could Not Find One For The 4 Wheel Drive Control module. I Think There Is One. Thanks.
2000 Chevrolet Silverado 1500 4.3L neutral switch VIN: 1GCEC14W5Y
Well, we got this 00 Silverado 2wd 4.3 pickup in. it has a 4L60E transmission. vehicle first came in with transmission locked in 3rd gear according to my mechanic & customer stated just wasn't working right. mechanic checked it out and found codes P0753, P0758...
2001 Chevrolet Silverado 1500 4.8L abs action VIN: 2GCEC19V01
This is the second vehicle we have with same problem, left front wheel speed sensor drops in rpm compared to other wheels at low speed almost stopped, causing abs activation. All looks good and tests good, we changed the ignition switch which was not a related...
2001 Chevrolet Blazer LS 4.3L radio VIN: 1GNDT13W21
Dear group, I received, BLAZER 96. Replaced the battery.The theftlock was activated. Now dont have the code and the radio says loc. Please advise. The first 3 digits of the display code are displayed: 232 the next 3 numbers: 235
2002 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNFK16Z42
Hi all this thing runs bad. Most of the misfires are on 1 and 3 but all have some in the history. Fuel trim is way out there -31short and -15 long both banks. Blows black smoke and all plugs are black. The fuel pressure is about 50psi. The fuel pressure regula... Trouble codes: P0300 (Multiple cylinder misfire)
2003 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDX03EX3
This one came in with MIL on, cust. stated it ran fine. Found code 131 for O2 voltage low. On the freeze frame it showed that PCM was operating in OPEN Loop, O2 showing lean, Coolant temp was 195F, TPS at 100%,4800 rpm 73mph.OK, Van has 134000 miles,orig. O2 I... Trouble codes: 131 (HO2S low votage)
2000 GMC Jimmy Diamond Edition 4.3L Front Wheel Bearings VIN: 1GKDT13W8Y
Okay we get this new customer with a 2000 Jimmy 4x4 (by referal) last year. She complains that one of her Front Wheel bearings are noisy. So she also adds that the GM Dealership have changed both front Wheel Bearings TWICE in the past. Can't remember if they w...
1994 Oldsmobile Cutlass Supreme 3.4L Hesitation, Misfire VIN: 1G3WT35X5R
car came back after wires and plugs customer said it stalled 5 times brought it back and we could not get it to die . he said it is alot better but still has a miss felt light accel from stop , a little shaky at idle and you feel it good at about 50 mph.we re ...
1997 Oldsmobile Aurora 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3GR62CXV
customer came back complaining of stalling after previous work was done road tested with customer vehicle stalled in parking lot during parking manuvers got vehicle back inside found code p1599 stored in computer did diag for code found bad idle air control va... Trouble codes: P1599 (cc power management or engine stall), P0507
1999 Oldsmobile Intrigue GL 3.5L crank chain sproket VIN: 1G3WS52HXX
car overheated, we pulled heads and did not find any thing wrong with gaskets or heads, we then found block craked at engine valley. We had engine crack welded by alloy specialist, we put engine back toghether and it ran perfect. Two weeks later came in on hoo...
2002 Oldsmobile Alero GX 2.2L brake pads VIN: 1G3NK12FX2
Hi Techs, I installed new high quality pads and rotors on this car 6 months ago (12,000) miles and now the front outboard pad is worn down to metal on one side and the other side is almost gone also. The slides on the cradle move freely and the piston in the c...
1988 Pontiac Grand Prix 2.8L Stall VIN: 1G2WJ14W7J
when driving this car under accel when rpm reaches between 3500 and 4000 the engine quits as if you turned the ignition off. I have replaced the pcm ign.module and crank sensor. when it quits you can put it in neutral and it starts right back up.
1999 Pontiac Grand Am GT 3.4L Serpentine Belt VIN: 1G2NW52E3X
This vehicle has been a nightmare. I would never think it would be so hard to fix something as easy as a squealing belt. Vehicle had a horrible belt squeal at all engine speeds that was very loud and has been squealing for a long time. First I changed the belt...
2000 Pontiac Grand Am SE 3.4L plenum VIN: 1G2NF52E2Y
hellow first time user so bear with me, replaced lower intake on grand am 3.4 have done lots of these and never had this problem before when putting on the plenum it craked, thought maybe i screwed somethning up, took it off and did not see any thing out of pl...
2004 Saturn L300-1 2.2L oil VIN: 1G8JCJ4F74
we have changed oil on this car from day one last week we change the oil and filter the car left the shop full of oil with in 20 miles the car returned making all kinda engine noise . no oil lights or any lights of any kind ... removed the valve cover and foun...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Century Custom 2.5L no start VIN: 1G4AH5155H
I checked the car for fire when it was cold and did not start and it did not have fire so we pushed the car inside where it was warm the next morning it had fire and started fine .So i replaced the module and tried it again and it had fire and has been startin...
1992 Buick Eighty Eight 3.8L Cuts out VIN: 1G3HY53L6N
I tested the crank sensor, seemed ok tap tested it and would not even stumble a little, so I checkedd the ground wires all were tight and so I replaced the ignition module. Seems to ber runnning fine now. Thank you everybody for the help the common replies I g...
1993 Cadillac DeVille 4.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6CD53B9P
I have not had the opportunity to work on this car since the update. I must close this request. The cam sensor is a hall effect sensor. I replaced the sensor. It did have a signal, but I could not check it at the ecm. I had a 2 connector ecm. It was not the bc... Trouble codes: E23 (Electronic Spark Timing EST Signal Fault), E41 (Camshaft Position CMP Sensor or Circuit Fault).
1989 Chevrolet Corvette 5.7L Poor Idle Quality, MIL Lamp on VIN: 1G1YY2183K
First Thanks to all that responded. I was pulling my hair out till I went back through the flow chart again and found that circuit 424 Tan/Black wire was intermently Grounding out between the 4 wire connector and the disconnect for timing connector, I Hooked u... Trouble codes: 42 (Electronic spart timing).
1999 Chevrolet Silverado 1500 4.3L Surge, Misfire, MIL Lamp on VIN: 1GCEC14W2X
Hi all who offered help. One said tune engine witch we had already done, four thought a worn distributor gear was the problem (we had already verified good gear and distributor in good shape), the most promising was to perform CKP variation relearn, but would ... Trouble codes: P0300.
2004 Chevrolet Silverado 2500 6.0L inst. cluster VIN: 1GCHC24U14
Thank you to all who responded. what a diaster this entire job was,who would ever think replacing a cluster would be such a pain in the rear, took it to the 1st dealer and had a guy wait he was there an hour before he called and said their internet was down,ca...
1992 Geo Storm 1.6L Hesitation, Cuts out, Stall, MIL Lamp on VIN: J81RF2365N
I want to thank all the techs who tryed to help us. We checked cam and crank gears but key ways looked good. We tryed a air temp sensor in manifold but did not help. We tryed a remaned dist. & a set of plugs but no help. Seeing as how the fuel pressure was goo... Trouble codes: 110 (undocumented code), 140 (undocumented code).
1994 GMC K1500 Suburban SLE 5.7L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GKFK16K9R
Thank you for all of your information- you guys are awesome! The miss is gone- on advise from several of you, I double checked valve clearance, and while it was a bit tight it did not cure the problem. Turns out, when the local Chev dealer rebuilt the throttle...
1998 GMC Savana 3500 6.5L Cuts out, Stall, no start VIN: 1GTHG35F4W
We willl call it a fix. I installed a new fuel cutoff solinoid , fuel driver module and external cooler for the module and so far so good. The customer had it for a week with no problems. I knew it would repair the problem, just wanted some feedback. Thanks
1999 GMC Sierra 1500 SL 4.8L Fuel gauge VIN: 1GTEC14VXX
I changed both the IPC & fuel sender as one of the respondents stated. I apologize for not having the names of all that sent advice, but computer problems wiped out all my previous e-mails. Thanks to all for the help.
2003 GMC Envoy XL SLE 4.2L noise VIN: 1GKET16S73
I want to Thank You All for the replies Gary in Florida and Glen in Louisiana nailed it It was the Mode Door Motor But I also got some good Info from Charles in Georgia and Scott in Illinois about BCM Reflash bulletins and Bradley in Missouri said IPC being Tr...
2004 GMC Savana 2500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTGG25U14
Thank you for all the replies and tips. In a nutshell it ended up being a defective upstream O2 sensor on Bank 2. Ted from Manitoba made the suggestion that had already occured to me. I switched the RH O2 to the left hand sensor position and watched the readin... Trouble codes: P0174, P0175, P0300.
2006 Hummer H3 3.5L No Start, Stall VIN: 5GTDN13696
Car was sent to another shop that have GM ecms coding/programing tools. I donīt know the diagnosis result yet. The information I received: Probably a internal ecm memory failure Or a ignition switch problem (typical) Thanks Trouble codes: P0601 (Control Module Read Only Memory).
1999 Pontiac Grand Am GT 3.4L Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G2NW52E3X
After I flow tested and cleaned the injectors along with new upper intake gaskets, the fuel trim is now reading around -10%LT. The car is idling fine and running good. I am still skeptical as to whether the car should be purging at idle. But for now I will cal...
2003 Pontiac Grand Prix GT 3.8L key cylinder VIN: 1G2WP52K53
ya you guys were right, i put a bone yard shifter in it and now it works fine. problem was intermittent, now it definately gone.i'm not sure i like the idea of the used shifter but less than 1/4 of the price of new a used car lot will never put a new one in.no...
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next