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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 26, 2005
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Open Help Requests for GM
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1993 Cadillac Eldorado Touring 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6EL1292P
hello friends have a intermittent fault, customer stated check engine lamp on, had multiple codes, recorded codes, cleared all modules, road tested vehicle several miles with no reoccuring troubles. 1 week later owner started car, white, grey smoke out exhaust... Trouble codes: P0046, P0083, P0137, 1032, A037, T072
1994 Cadillac Seville SLS 4.6L Poor Idle Quality, Cuts out VIN: 1G6KS52Y1R
The customer said the vehicle would stall also the speedometer would not work when the traction control disabled message would come on. I road tested the vehicle and checked for codes. There were several history codes,Po56,Ipc 32,52,tcs72, 73 and a current Po5... Trouble codes: TCS73 (PCM-EBTCM/EBCM PWM Signal Fault 4.6L Engine)
1999 Cadillac Seville STS 4.6L fuel gage VIN: 1G6KY5492X
the fuel gage drops to empty, radio cuts off, power windows & door locks quit working, traction off message, theft system message comes on. Was sent to us from another shop. The DIM has been replaced, PCM has been replaced, & reflashed with latest updates. No ...
1991 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCDC14K9M
When you try to accelerate the vehicle stumbles and then takes off. The vehicle seems to be ok at higher rpms but when it comes back down to low rpms it wants to stumble and die. This seems to happen intermittently. We have tried replacing the ecm, the knock s... Trouble codes: 43 (esc)
1995 Chevrolet Lumina 3.1L Hesitation, Surge, Misfire, Poor Fuel Economy VIN: 2G1WL52MOS
hello guys this car came in to me with no repair history runs rough ,I pulled codes has 77& 76 egr solenoids 2&3 . I went ahead and did function test found no flow,raise hood has a brand new egr valve on it,egr port needs to be cleaned .now on to next problems... Trouble codes: 77 (egr 3), 76 (egr 2)
1999 Chevrolet Express 3500 5.7L Stall VIN: 5B4KP32RXY
Thanks ahead for any advice. I've got a fleet van that won't idle. I have an endless supply of parts for these vans so I've already tried swapping upper plenums (with the IACs in them), reflashed PCMs, etc. The problem is that the IAC always extends all the wa...
1999 Chevrolet Malibu LS 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1NE52J8X
this one is driving me crazy, another tech in the shop did a valve job and that went well 2 days later car comes in with check engine light on and misfire code p0 305 stored,found injector # 5 not working replace injector and test drive,all okay. Now car is ba... Trouble codes: P00, 300 (random misfire)
2000 Chevrolet Silverado 1500 5.3L Window VIN: 2GCEC19T1Y
Hello folks, I have this Silverado the driver window would not go down or up. When activating switch for window to go down it makes clicking noise at the switch area, just like there is a relay making click noise. Also it has late start problem, possible fuel ...
2001 Chevrolet Silverado 3500 6.0L engine VIN: 1GCGK13U12
This truck is knocking (15K). It sounds like a piston pin or lifters. Does not go away after worming up. I did put some top cleaner into cylinders owernight (after reading previus help request). No difference in noise at all. Then I disassembled right cylinder...
1996 GMC C1500 Sierra SL 5.0L All Shift VIN: 1GCGC24M3T
Hello to all, I got this truck four days ago stuck in failsafe, no scan communication and burnt tranny fluid. I put in a new computer after verifing power, ground and continuity to the relevant pins on the DLC. Still no communication on three different scantoo...
1996 GMC C1500 Sierra SL 5.0L Brakes
Customer came to me after putting new brakes(front & rear), on his 1996 GMC 1500, the brakes are very weak, on a test drive, I stepped on the pedal and minimal braking force was being applied, and the truck was very slow to come to a stop. Felt like air... cra...
2003 GMC C5500 Topkick C5E042 6.6L engine VIN: 1GDE5D1113
Scan Data shows cranking rpm of 180. Scan Data shows injector balance info of 20ms with KOEO,when cranking these numbers fluctuate for the first couple of revolutions and then return to 20 and stop fluctuating during cranking.Cam pulses missed always shows 1 a...
1999 Oldsmobile Alero GL 3.4L MIL Lamp on VIN: 1G3NL52EXX
Vehicle presents with no shift quadrant display, no odometer, no tach or fuel gauges, no hi-beam indicator. All fuses test good. Computer will not communicate with our M2500 scanner despite numerous attempts. After cycling key off and on again now all dash lig...
1999 Pontiac Grand Am SE 2.4L codes b1001, b2965 VIN: 1G2NE52T1X
This vehicle seems to set a B1001 option configuration error code every few months. We have installed new BCM's from GM each time. This BCM comes configured when you buy it and can not be reprogramed. This vehicle still has all its factory options such as radi... Trouble codes: B1001 (option configuration error), B2965 (key in ignition fault)
1997 Saturn SC1 1.9L No Start, Cuts out VIN: 1G8ZF1286V
Engine Started OK cold! Fast idle [1700-2000 rpm]initially Approx 8min later it dies and won't restart until cooled down. Checks: Before all this Service engine light came on twice [cleared both times never to return]: CODES Trouble Code : P1404 Descriptio...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW54K71
I replaced the EGR valve and purge solenoid. Customer has been driving it for a week now and I drove it around for 3 days before I gave it back to her. She called today and said the light has not been on. Trouble codes: P0440 (Evap System), P0404 (EGR open position performance).
1980 Chevrolet Pickup K10 5.7L Stabilizer Bar Bushings
I did not have any luck in pressing in the factory bushings. I managed to call a 4WD supply place & get a kit to solve this situation. The replacement for the original 1 piece bushing is a 3 piece set of 1 metal sleeve and 2 plastic bushings.
1995 Chevrolet Lumina 3.1L Safety VIN: 2G1WL52M9S
Good morning Replaced the door lock switches again, after replies indicated broken wires, but power supply or being able to make the locks work by jumpering the connectors at the lock switches was never a problem. We will know if these new switches will cont...
1995 Chevrolet S10 2.2L No Start VIN: 1GCC51440S
Thanks to chris and also a big thanks to joe who called me and reminded me that the injectors were sequential instead of mulitiport.I wound up replacing crank sensor back with other two wire uniyt and swithing injectors from old motor into new unit and the tru...
2000 Chevrolet Blazer LS 4.3L trans VIN: 1GNDT13W3Y
I checked the fuses and ignition switch - all ok. Still no codes present. All wireing tested good. Several people said to look at the solonoids, since the concern is intermitten, i went ahead and replaced the shift solonoids. Test drove several times, cust. ha...
2002 Chevrolet Silverado 1500 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 2GCEK19T82
Thanks for the thought and information provided by all of you for my problem. Found the answer in a recent TSB from GM. Roger [...] hit the answer on the head too!! Big Ups Roger!!! Based on computer strategy, this engine will misfire based on a clogged cat ... Trouble codes: 300 (Multiple Misfire), 301 (misfire cylinder 1), 307 (misfire [...]).
2003 Chevrolet Suburban 1500 LS 5.3L radio VIN: 3GNFK16Z93
Thanks for the pointers. However I finally got a 03 gmc yukon in that had a nav. system in it. In the gmc I could receive data from the amp., in the chevy I couldn't. I have to assume that chevy must run a different amp for the non-nav. system even though both...
1990 Geo Prizm GSi 1.6L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1Y1SL5453L
Hi ,thanks to the 4 people who tried to help .After rechecking all the wireing and actually testing the new o2 sensor disconected it would put out voltage,also i checked the wire all the way to the comp and with the wire disconected still had same prob .Only p... Trouble codes: 26 (rich exhaust), 21 (02 sensor), 25 (lean exhaust).
1990 Geo Storm 1.6L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: J81RF2367L
Hello and thanks for the replies. Unfortunately, this one seemed to work itself out before I could look into it further. I was going to pull it in and check for vacuum leaks as two of the replies said and the misfires were gone. I had also considered doing a r...
1992 GMC Motor home 454CID No Start, Stall VIN: 70N6322373
Thanks to all that replied, and gave me encouragement on this beast...and also to those who had good comic relief on the topic. All is much appriciated. Anyway, I had quite a few responses regarding the distributor. I removed the distributor and had a close ...
1996 GMC K2500 Suburban SLE 6.5L Poor Idle Quality VIN: 3GKGK26F2T
found a wire harness behind the fuel filter bracket that rubbed creating a short to ground. harness not routed correctly since the dealer replaced the injection pump!
2000 GMC Sierra 1500 SL 4.8L engine VIN: 2GTEC19V3Y
I would like to thank all of the people that replied to my post Gm says this is a normal condition. my friend feels better knowing that it is noe=rmal and that he didnt buy a lemon. thanks again for the help
1969 Pontiac Gran Prix 428CID ignition VIN: 276579P159
well, the response from you guys was incredible, but at the same time a little confusing. So, with my own experience, I picked out what I thought would be the most likely and got it going. I did check the wire I was using for ignition supply, but once it was r...
1993 Pontiac Trans Sport 3.8L No Start VIN: 1GMDU06LXP
You guys hit the nail on the head !!! Cleaned the ignition module grounds and it started right up. Thanks for all the help. Trouble codes: 17 (crank rpm shorted), 18 (crank signal open/no signal), 21 (tps ckt high), 37 (maf sensor or circuit too low), 42 (est problem open/clsd loop-open exhaust 02-rich).
1995 Pontiac Sunfire SE 2.2L Poor Idle Quality, Stall VIN: 1G2JB5245S
It appears that most of the stalling problems were actually cured by replacing the PCM. It just took a lot of miles & time for the relearn process. Although the car did still ocasionally die, but only when coasting or braking in 3rd gear. Replacing a sticky br...
1996 Pontiac Grand Prix GTP 3.4L Timing belt VIN: 1G2WJ12X9T
I recieved 26 responces on this job and about 24 of them were a great help. It had a loose timing chain causing the noise that was coming from this beast. After seeing how this thing is put together I suppose the loose chain could have caused the old timing be...
1997 Pontiac Sunfire SE 2.2L poor starting VIN: 1G2JB1248V
Fuel pressure tests and leakdown tests were in spec.Replaced all 4 injectors.Problem cured.
1999 Saturn SL1 1.9L Service Light VIN: 1G8ZH5282X
I received 8 responses, of which Jim from NC was right on with a QDM error. Because this is my personal vehicle, I don't have a Tech 2 scanner. Thanks for all your help!
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