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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 3, 2006
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54C8M
hello to all; thanks in advance for this simple problem giving me a headache. has cam sensor code 41 upon start up. runs great, no driving issues, replaced everything!! cam sensor, ignition module, computer, prom, tested wiring to pcm. followed test steps; tak... Trouble codes: 41 (NO CAM REFERENCE signal)
1994 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1G6KD52B1R
This customer came in with this car and said he would be going down the road and the car would just start slowing down on its own and start popping and running bad.He said he could pull over and turn off the ignition for a few minutes and start it back and it ...
1997 Cadillac Catera 3.0L Cooling Systems VIN: WO6VR542VR
Hi Guys, this 1997 Cadilac Catera with 3.0L , Customer concer Temp gauge goes almost to red, No anti-freeze leak, fans working fine, We check Alldata & there's a TSB for coolant temp sensor we install the update one, new thermostat & still running high, accord...
2001 Cadillac Catera 3.0L sport track light .prndl lights VIN: W06VR54R21
customer states that the sport track light comes on. when the light comes on the prndl lights come on also .this happens intermittently,usually on the first start of the day and will not do it later in the day.if he cuts it off in the morning the light will go...
1976 Chevrolet K20 Cheyenne 5.7L Misfire VIN: CKL246Z151
I have a miss on #3 cylider. Checked all of the basics.. ignition timing, compression, vacuum reading (is low, 10-14 inches at idle and 19-20 on cruise, the needles bounces on cruise,and bounces slightly more on idle). Discounted a burnt valve due to compressi...
2000 Chevrolet Suburban 1500 LT 5.3L hard starting VIN: 3GNFK16T6Y
Hello fellow techs, Had this Suburban come into the shop for hard starting after hot soaking. I have tested for codes and none found. This vehicle will take up to 30 sec. to start after setting for more than 30 mins. after it is hot. When cold, it starts right...
2001 Chevrolet Impala LS 3.8L Hesitation VIN: 2G1WH55K71
Hi, folks. This vehicle has a very bad "chuggle" or "fishbite" sensation and RPM gauge fluctuates up and down just as torque converter clutch PWM begins in third and fourth gear. TSB #05-06-04-058 describes the symptoms exactly, so I replaced the TP sensor to ...
2004 Chevrolet Trailblazer LS 4.2L starter VIN: 1GNDS13S54
hello everyone, truck towed in, no crank. after fooling with some wiring and the remote key for awhile, was able to get started. could not get started again after we turned it off. fooled with the same wiring and remote and nothing. sometimes with key on the s...
2005 Chevrolet Tahoe LS 5.3L Transfer Case VIN: 1GNEK13T05
Hey Folks, Wondering if this CO327 is a common issue with these vehicles. What happens is the shift indicater switches light up with key on but all go out when running. Transfer case won't shift into any position. Obviously is in default 2WD since it moves ok....
1997 GMC Jimmy SL 4.3L No Start VIN: 1GKDT13W5V
hello all,had a jimmy towed to shop with no crank will turn over fine but no spark.first noticed the wrecker driver cant get vehicle out of park to roll off of wrecker.after checking it out when u turn key on there are no lights on in dash at all only thing th...
1999 GMC K1500 Sierra SLE 5.7L Peddle travel VIN: 1GTEK19R5X
This unit came in for routine service - Inspected unit and found brakes were bad all around - called customer and he approved work, all went well on friday and thought this was a done deal, Monday morning this truck is at my door step with complaints of low pe...
2000 GMC Sierra 2500 SL 6.0L 4wd VIN: 1GTGK2448Y
hey guys i have this 2000 gmc that is in 4wd when you press 2wd button a grinding noise from transfer case and the 2wd button flashes.is this a common problem.it seems that the truck is stuck in 4wd.please help
2003 GMC Sierra 3500 6.6L Rear Brakes
This is the 3rd time in the last 6 months that we have had to do major repairs to the rear brakes on this vehicle. In each case, the brakes on the rear will wear down to metal on metal within 2000 - 4000 miles. This is a work vehicle that is used by a backho...
1995 Oldsmobile Cutlass Ciera 3.1L Hesitation, Cuts out, Stall VIN: 1GEAJ53M5S
Hello again guys, have another wierd one. This vehicle will turn the service light on and cam sensor po341 is set every time. Now when you road test the cam shaft frequency will glitch out and code is set. When glitches will hesitate stumble and when come to a... Trouble codes: P0341
1997 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy VIN: 1G2JB1241V
original shop replaced all four injectors, fuel filter. came back next day with check engine light on. found code po172, bank 1 system too rich. replaced both o2 sensors as injectors damaged the sensors. went back four days later. don't know what the codes wer...
2001 Pontiac Montana 3.4L Hesitation, Cuts out VIN: 1GMDX03EX1
This van acts like you are turning the key off and back on every second or so for 5-10 seconds, then clears out. Our Genysis has recorded several of these occurences and shows , cam, MAF, TPS, etc. all good. o2 sensors act like nothing has happened. The only t...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Custom 3.8L No Start, Poor Idle Quality, MIL Lamp on VIN: 1G4HP52L7S
Thanks for the help! Most of the replies told us to check items that we had already checked, but there were a couple of good ideas such as testing the charging system and inspecting the grounds on the bellhousing. We had already tested the voltage drop across ... Trouble codes: P0640 (QDM 1 Failure), P0650 (qdm 2), P0670 (qdm 4), P0705 (PRNDL Switch Failure), P0561 (Cruise vent Malfunction).
2001 Cadillac Seville SLS 4.6L Unknown VIN: 1GGKS54Y01
our customer has decided to trade for new car. chad,jim and kevin suggested pwm solenoid and wiring problems a lot like we have had on 4t60e and 4t65e transmissions.problem is the time it says it is going to take to change them. then jeff told about tsb with m...
1995 Chevrolet Cavalier 2.2L Poor Idle Quality VIN: 3G1JC1246S
thanks for the advise guys. it turns out that the timing chain had jumped or it was installed incorrectly. put new chain gears and guides car runs great. and compression is back. thanks once again.
1997 Chevrolet S10 2.2L tensioner VIN: 1GCCS1444V
The problem was the ac compressor.The high side pressure fluctation was consistant with the tensioner noise.Customer does not want to fix the truck right now.Thanks again IATN and everyone that took their time responding to my post.
1999 Chevrolet Tahoe LS 5.7L Excessive Emissions, Poor Idle Quality VIN: 1GNEK13R9X
found broken o2 sensor harness at back of engine , when engine was replaced it must have gotten pinched and finaly work apart, repaired harness, has been running great , thanks for all your help, sorry for the long delay on closeing, have had computer problems...
2001 Chevrolet Express 1500 5.7L Lighting VIN: 1GBEG15W91
This problem is with the wiring harnesses for the taillights ( mostly grounds ). The upper two lights are signal lights on bright. The lower two are stop lights on bright. All 4 are taillights on dim. There is a repair harness avail from Chevrolet to cure this...
2005 Chevrolet Silverado 2500 HD 6.6L trailer wiring VIN: 1GCHK24265
Thanx to all who replyed. Turned out to be the flasher module. Thanx again Steve
2003 GMC Sierra 1500 SLE 5.3L Poor Idle Quality, Misfire, MIL Lamp on, Low Power VIN: 2GTEK19T63
Thanks to all 15 members who took time too help me out!!! 14 of you voted for a plugged cat on the affected side, & that was what it was. After the first two replies I gave my head a smack for not thinking of this most obvious problem. (forest & tree syndrome)... Trouble codes: P0101 (Maf Efficiancy), P0300 (Missfire).
2005 GMC Envoy XUV SLE 5.3L Rear window VIN: 1GKES12P84
Hey fellow techs. Came in this morning and hadn't had any replys yet so I searched alldata again and again didn't find anything. I decided to take the rear door panel off and have a look. I was also able to take glass loose from regulator and slide up out of t...
1996 Saturn SL 1.9L Misfire, MIL Lamp on VIN: 1G8ZF5281T
Thanks for all of the input guys! I ran a top end cleaner through the engine and it had no effect. Motorvac was the ticket. Found it odd that #1 and #4 injectors were iffy, was inclined to think it was ignition as they share a coil. Drove car for ten miles and... Trouble codes: P0300.
2005 Saturn Ion-2 2.2L Hesitation, Stall, MIL Lamp on VIN: 1G8AN12F55
Thank you to all that replied. In the end i found out that the motor had been replaced with a 2003. The injectors were different from 03 to 05. I ordered injectors and then found i needed a new injector harness also. After replacing both of them wile road test... Trouble codes: P0171.
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