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Prev Professional Automotive Repair Technical Discussions for May 5, 2005
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Limited 3.8L Stall VIN: 1G4HR53L1N
This car has a very intermittent stall, problem will occur idling, cruising, turning , decell. nothing very consistant I can get it to act up in the bay a few times during the day while idling, engine will usually start right back up with no problems. Sometime...
1993 Cadillac Seville STS 4.6L water pump VIN: 1G6KY5296P
Hello Cybertechs, This Cadillac STS came in with a coolant leak and following a pressure test, a leak was observed from the waterpump. The pulley side of the pump shows a long term seeping leak. Very nasty looking. Tech proceeded with the teardown to replace t...
1997 Cadillac Eldorado 4.6L Electronic VIN: 1G6EL12Y3V
This one is acting a little strange. Car came in today with A/C cooling pretty good, but customer complained that yesterday the A/C off light was on, on the control panel and she could not get it to go off and compressor was off and only cool air blowing out t...
1994 Chevrolet K1500 4.3L high idle VIN: 1GCEK14Z8R
hi guys,we are having a hard time with this truck,it idles at 1100 rpms all the time,customer replaced the iac motor and the pcv valve.we blocked off the iac port and did not change,also drilled out the base idle adjustment screw will only go down to about 850...
1996 Chevrolet K1500 Cheyenne 5.7L Engine VIN: 1GCEK19R7T
Hello all. I could use a little help on this one. Vehicle came into our shop with a random misfire code, misfire on 1 3 and 8. Opened hood and found number 1 and 3 plugwires swapped, changed back and nuber 3 misfire went away. I then set cam retard and small m...
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1C1JC5247V
vehicle returned to shop following monday. mil on and P0300 stored. scope checked ign. found all normal. misfire data/ misfire on all cyls. alternating, LTFT at -8 STFT at -17 customer has stated that #2 fuel injector had been changed about 3 weeks prior. we d... Trouble codes: P0300
1998 Chevrolet K1500 Cheyenne 5.0L Misfire, MIL Lamp on VIN: 1GCEK19MSW
Hi Guys, This truck came in last summer with a SES light on, another tech in our shop found a random misfire code and the customer confirmed that the truck indeed had a skip if you put it under a load for a long time(long steep grade). At that time the truck s... Trouble codes: P0300, P0420
1999 Chevrolet Silverado 1500 4.8L flasher relay VIN: 1GCEC14V1X
Vehicle has a clicking noise(relay closing).Have narrowed it down to combination flasher relay.Located backside of instrument panel fuse block,inside vehicle.It sounds like when you have directionals on,but there not blinking).It is intermittent.Anybody seen t...
1999 Chevrolet Silverado 1500 5.3L mode switch VIN: 1GCEK19T4X
2000 Chevrolet Silverado 1500 5.3L ablilty to stop VIN: 1GCEK19T6Y
This vehicle was brought to me by the customer after he replaced front hubs.He told me they were replaced (he did not state why) l.h.front first then r.h. front hub.After the left hub hub was repalced the A.B.S. will activate EVERY time speed drops below 10 mp...
2000 Chevrolet Impala 3.8L Cuts out, Stall VIN: 2G1WF55K9Y
This car is going to take what little hair I have left. It will intermittently cut out in a rythmic pattern, check engine light, brake light and trac off light will blink in rythm with the cutting out. It will stall if allowed to idle, but keep running if acce...
2001 Chevrolet Blazer Xtreme 4.3L Mechanical VIN: 1GNCS18W51
we ran diag, after pump was replaced and code came back on, found it to have a voltage drop at battery and cable ends looked bad so they were replaced , code cleared and then came back on again. ran diag same code comes up. is it possible the pump is defective...
2001 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Surge VIN: 1GCHK24161
Hello to all, I have a duromax with a slight rolling ilde all the time, cold, hot, in gear, etc.No fault codes runs fine other wise. Idle speed varys only slightly 25 to 50 rpms but you can here and feel it surge up and down. any 6.6 techs. out there seen this...
2001 Chevrolet Prizm 1.8L oil consumption VIN: 1Y1SK52871
Hello group, This Prizm came to us with what anyone one would concider eccesive oil consumption, up to two qts. per 1000 mi. After consulting with our machinist & checking TSB,s, we thought it best to pull the head for inspection & valve job. After completion ...
1994 GMC K2500 Sierra SL 5.7L ddaytime running lights VIN: 2GTFK29K0R
im asking for help because im not sure of what the module is looking to see on the tan and white wire that goes to the ign switch and the park brake light switch,then through two diodes and then to the rwal module and then the proportioning valve switch,i have...
1997 GMC K2500 Sierra SL 6.5L Stall VIN: 1GCGK29F2V
the pick up stall intermitent,when driven or idle,to start it again i have to take out and put it back the shut off selenoid fuse many time whit the ignition swicht on,that fuse is for drive injector module too. Trouble codes: 1218 (unknow for mi)
2001 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GS64C92
Hello fellow techs. We have this 2001 Aurora that came in initially with a code P0140. We went through the flow of diagnosis from Alldata and concluded that during a previous major repair, the fresh air tube to bank one was crushed and no fresh air was being i... Trouble codes: P0030, P0141, P0155 (a2 sensor heater malfunction b2s1), P1032 (invalid dtc)
1990 Pontiac Grand Prix Mclaren 3.1L Poor Idle Quality VIN: 1G5WP14VXL
I have 1990 pontiac grand prix 3.1 turbo, the car came in with a check engine light on, code 34. Map sensor signal low, engine vacumn is at 20 hgs,the car runs rich and idle quality is poor. The following parts have been replaced by past mechanics, all this is...
1998 Pontiac Trans Sport Montana 3.4L speedometer VIN: 1GMDX03F1W
replace speedometer with a used one still no working, replace power train computer with used one and still does not work, injected 5 volt on pin 55 and broke signal up by moving wire and i can make the speed increase on the speedo. On my wiring diagram it look...
2001 Saturn L200 2.2L Poor Idle Quality, MIL Lamp on VIN: 1G8JU52F21
car came in for ses light on, and car shifts hard and then can't get above 30 mph. test drove car and duplacated problems. scan check car and found code p0122. tested tps and wiring. cleared code and and test drove again. problem did not return. must have fixe... Trouble codes: P0122

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick LeSabre Custom 3.8L Cuts out VIN: 1G4HP53LXP
Tested ignition coils & 2 didn't have enough spark, replaced all three coils and seems to run just fine now. Thank you for all of the help.
1995 Buick Riviera 3.8L Twilight Sentinel and Auto headlights VIN: 1G4GD22K6S
Thanks to Jeff,Chris and Brian for taking the time to find the information on Mitchell and answering my request.Thank you Chris for faxing the info to me.The ambient light sensor would change resistance from 1,000 to 5,000 ohms,it's supposed to change from 15,...
1999 Buick Regal GS 3.8L No Start, Stall VIN: 2G4WF5212X
Thank you to all who responded to my request. The short answer is that the maf was bad. It would cause the injectors to stay open too long intermittantly. Details as follows: Since the car would die right after starting, the most common cause on the supe...
1994 Cadillac Eldorado 4.6L No Start VIN: 1G6EL12Y7R
the wire connector to the crank sensor b was replaced but the wires were crossed (the polarity was backwards) good lesson and a lot of Aggravation Trouble codes: 53 (4x not recieved).
1995 Cadillac Seville SLS 4.6L Starting VIN: 1G6KS52Y8S
I had to change the decoder module thank you for all the help as all the help I recieved the answer from ken in georgia
2000 Cadillac DeVille DTS 4.6L Brake switch circuit VIN: 1G6KF5799Y
The fix was simple, although the diagnosis was not. We tapped in to the white wire on the load side of the brake switch to observe its operation. The switch circuit worked normally EXCEPT WITH THE CAR IN REVERSE WITH THE BRAKE RELEASED. Under those conditions,...
1994 Chevrolet K3500 7.4L Poor Idle Quality, Surge VIN: 1BHK34N4RE
I apologize for the long delay in closing this with a fix. My location is very rural, and sometimes with a fix, I don't see my customers again for a very long time. Anyway, thanks to all who responded so very quikly with help. The aftermarket PROM fixed the id...
1996 Chevrolet Monte Carlo Z34 3.4L rotors VIN: 2G1WX12X1T
thanks for the help. the final fix on this car was to actual relace the rotors with a better rotor. i was using car quest rotors. the rotor that solve the problem was from ac delco. thanks for all of the suggestions.
1997 Chevrolet K2500 5.7L speedometer VIN: 1GCGK24R9V
Finally,its working.The problem was the purple wire from the sensor was cut and corroded,and would not get signal all the time,i pulled on the wire harness a couple of times and it showed up.Thanks to rodger,john,deke, and louis for your time.PS---I never did ...
2002 Chevrolet Venture LT 3.4L No Start, MIL Lamp on
Most of you hit the nail on the head. I must have nicked the sensor when cleaning off the gasket. New sensor, and no problem. Thanks for all your replies. They were very helpful. Tim. Trouble codes: P0340.
1997 GMC K1500 Suburban SLT 5.7L No Start VIN: 1GKFK16R0V
thanks to all it turned out to be a loose ground fou the ign.module up by the theromstat housing. also found broken body ground by the right head. curt at [...] auto
1993 Pontiac Bonneville SE 3.8L anti theft system VIN: 1G2HX53LXP
first off i have to say thanks to all who replied. i was fianlly able to finish this car today.i had put it on the back burner for a few days. i soldered in then resistor and it started right up the problem i was having was my wiring diagram in mitchell was ...
1992 Saturn SL1 1.9L sunroof VIN: 1G8ZH5492N
hi techs thank you all that relyed i needed the help it turned out to be a bad swich ...replaced and it works perfect .. thank you again for your help in this matter...
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