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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 28, 2004
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L engine VIN: 1G4CW52K2W
Hello everyone and Thanks in advance for some help! when we took in this Buick it would not start it would'nt even crank. Customer stated that it stalled while driving and would not restart. After about 1 hour would not crank over. After some basic checks we f...
1990 Cadillac DeVille 4.5L Poor Idle Quality, Surge, Cuts out VIN: 1G6CD5334L
engine ignition timing goes retard about 40 degrees from base timming. have to advance distributor just to idle engine.mechanical time correct.cam and dist gear ok.have to disconnect iac to keep from surge condition.
1988 Chevrolet Beretta GT 2.8L No Start VIN: 1G1LV11W2J
ok guys this one has me at my wits end this car was brought to us as a cranks,no start .I hooked up scan tool no codes,and no cranking rpm and my tp shows 1.63v, mat 1 deg, ect-40deg so I start by checking the crank sensor unplug the connector and part of the ...
1990 Chevrolet K1500 Cheyenne 5.7L master cyl VIN: 1GCDK14K3L
can bleed brakes manual/pressure bleed/get fluid at rear wheels/volume good/pressure low???
1996 Chevrolet K3500 Cheyenne 6.5L tcc lockup VIN: 1GCHK39F5T
This 4L80-E comes in and out of lock up whenever it likes - but it has to be driven up above 70MPH before it acts up, any slower speeds it's ok. Trans shop brought it in couple of weeks ago with new trans and EPC was not working after, the PCM was burnt up. Re...
1997 Chevrolet Astro 4.3L MIL Lamp on
Hello all, This truck has had an intermittent problem with this circuit (po121). I reviewed the freeze frame for the code and didn't perceive a problem. I'm a bit unclear about this situation. I followed the flow chart from Nodata and ofcourse came up with sy... Trouble codes: P0121 (TP sensor performance)
1999 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GCDM19W6X
This van has multiple cylinder missfires just off idle and at cruise, under load the missfire is gone, what I have noticed is that the cam sensor in the distributor is reading -15 degrees at 1000 or 2000 rpm, there is no adjustment on the distributor, I have r... Trouble codes: P0300 (Multiply Cylinder Misfire)
2000 Chevrolet Suburban 1500 LT 5.3L abs VIN: 3GNFK16T7Y
the customer came in complaining of low speed abs activation, scan tested the truck, no fault codes, performed gm's tsb regarding rust build up on the speed sensors (front), both were found to be covered, cleaned them as per the service bulletin, drove it, the...
2001 Chevrolet Corvette 5.7L ABS control module VIN: 1G1Y22G815
Good evening fellow techs, Usually I don't work on these vehicles, but I like challenges once in a while. Fixed belt squeal and stalling problems, but the ABS is calling for replacement of the EBC module. The code C1214 has to do with relay that powers up the...
1992 GMC Sonoma SLE 4.3L Poor Idle Quality, Hesitation, Surge, Stall VIN: 1GTCS19W2N
The customer complaint was that the truck would stall, hesitate and occassionally have a long cranks before starting. We found that the fuel pump was defective, it did not provide enough fuel pressure. Replacing the pump took care of the pressure problem. We t...
1997 GMC C3500 Sierra SL 6.5L No Start, Stall VIN: 1GDJC34F9V
this fleet truck has been stalling for no reason that we can find. some days it is fine, and other after driving and letting is set it will start, idle fine, then stall. when it stalls it is not like it is running out of gas, but like someone has pulled the b+... Trouble codes: P0236, P1641, P1643, P1654
2003 GMC Yukon SLT 325CID Rotors VIN: 1GKEK13222
Customer complaint of noise from the rear brakes. Upon inspection found that the right rear inside pad is worn out. Also noted excessive corrosion only on the inside of the front rotos. Looking in the iatn archives found that there is a problem with the rear p...
1994 Oldsmobile Silhouette 3.8L Stall VIN: 1FHDU06L7R
vehicle shuts off at idle, sometimes. owner complaint; dies during drive, (i suspect it is on deceleration. using "genisys", recorded stall and viewed data stream, all looks normal. cam/crank error is normaly 2, sometimes 3. i replaced crank sensor per other p...
1997 Pontiac Grand Prix GT 3.8L valvetrain ? VIN: 1G2WP12K7V
Hello, This car has what sounds like a lifter noise, kind of tick squeak noise, worse when hot. Rockers stay tight,lifters do not bleed down. The noise seems loudest on the rocker bolt on cylinders # 3,5,6 or could it transfer up from the balance or cam shaft....
1999 Pontiac Bonneville SE 3.8L Hesitation, -20 FUEL TRIM VIN: 1G2HX52K5X
hello fellow techs, this bonneville belongs to me. it is in good shape and i purchased it 2 months ago. it runs well but at times has some tip in hesitation and intermittent hesitation after sitting stopped at a light. this hesitation is very intermittent and...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP5219R
It was a bad ECM would loose Injector pulse or have none at times thats for the help. Something to keep in mind,the injector,it would flash with the key in the on position. I thought that was very stange. One of guys said that you had the same thing happen, if... Trouble codes: 1629 (Pass Key enable cir.), 1626 (Pass Key 2 signal).
1994 Chevrolet C3500 Cheyenne 6.5L Speedometer VIN: 1GBKC34F6R
Thanks to [...]. He was right the fix was a new ignition switch. Thank to other for their help. Gene
1999 Chevrolet Tahoe 5.7L No Start, Misfire VIN: 3GNEC18R3X
Hello!! Thank you for the opinions. I found the TSB on ALLDATA which Alex and Greg were also talking about. These trucks have extended warranty 10yrs or 200,[...] for injector poppets to stick closed. Now what? I have to make it run ,so the customer... Trouble codes: P0300.
2001 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GCEC19VX1
Well this one if fixed! #8 intake valve spring was broken not allowing valve to close fully causing low vacumm to map / pulse back into plemum causing maf eratic all of this adding fuel. It took me a while to figure out why #7 was showing the most misfires but...
1997 Oldsmobile 88 Royale 3.8L Hesitation, Surge VIN: 1G3HN52K6V
Sorry this has been open so lomg but we are waiting to get the car back in. we have tried just about everything on this car. feels just like timing is retarding. pulled front timing cover to check chain and gears it was ok. we driven it several times with tech...
1992 Pontiac Sunbird LE Value Leader 2.0L Misfire VIN: 1G2JC14H8N
Thank you men for the help! Especially Dave [...] and Vachicusco who firmly suggested using the OEM coil module. As far as I know the car is on the road and working good. I'm just sick of all these electronics components reps bragging about how good their c...
1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZG5284W
cleared check engine light and ran thru drive cycle, code did not return, ran thru inspection test (state) and it passed, customer told to drive until light re-activation. Trouble codes: P1404 (egr valve position error).
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