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Prev Professional Automotive Repair Technical Discussions for August 21, 2006
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Open Help Requests for GM
Help Request Answers
1994 Buick Regal Custom 3.8L voltmeter VIN: 2G4WB55L1R
Hi group, This car came in with a complaint that when the flasher is on, the voltmeter fluctuate. I checked all the grounds indicated on the wiring diagram and the powers according to Mitchell, they seem to be ok. I donot know what to check else. Has someone c...
1997 Buick Century Custom 3.1L a/c compressor VIN: 2G4WS52M7V
Hi guys, I have one that blows the fuse in the engine compartment fuse box for the a/c compressor. Its been in several times but its working fine at the time. The customer will drive it a day or so and he has to replace the fuse. Its an intermittant problem a...
1990 Cadillac Eldorado 4.5L interior lights VIN: IG6EL1337L
hi all have a problem with interior lights inop when you open the doors. they come on with the switch only.i have tested each door pinn switch and handle switches at bcm all are ok ,have no bcm faults i replaced the bcm ,still have same problem.has a...
1988 Chevrolet V30 Scottsdale 7.4L gear box VIN: 1GBHV34K4J
Thanks for everybodies time. Thiss old tuck is in good condition but has a pull to the right. Upon inspection found alignment good but both axle u-joints froze up & steering wheel kicks to the right on start up & falls back to the left we shutting off. Replace...
1995 Chevrolet K1500 5.7L Poor Fuel Economy, MIL Lamp on VIN: 2GCEK19K7S
hopefully someone can help us on this one. customer came in and said mil light on. scanner - code 13. he changed the o2 himself and light comes back on and burns all kinds of fuel. changed the o2 and same thing - vehicle will go into closed loop initially and ... Trouble codes: 13 (O2 Sensor open short or no good)
1997 Chevrolet S10 LS 2.2L Misfire, MIL Lamp on VIN: 1GCCS1942V
This is for a friend @ another shop I believe we have a computor or crank reluctor problem butttttttt.Here we go first after he brought the truck up today to see what my scan tool showed on the missfires it does the same which is if if you disconnect injector ... Trouble codes: P0300
1998 Chevrolet Venture 3.4L bogs on hard acceler VIN: 1GNDX03E8W
I know I'm overlooking something. When floored engine revs to about 2800 to 3600 rpm then bogs, spits,sputters,can't go faster. Seems worse when cold or warm. Seems like over-active rev limiter. Iatn data base says trans sends gear selection to pcm and rev lim...
2000 Chevrolet Impala 3.4L No Start VIN: 2G1WF55K8Y
This car originally came in with a vent valve code. Traced out wiring and found broken wire where harness loops under A/C accumulator. After repairing wire, found that car would not crank over. Tested circuits and found PCM was not grounding starter relay. Man... Trouble codes: P1825 (Mode switch)
2001 Chevrolet Tahoe 5.3L compressor VIN: 1GNEC13T91
as mentioned we replaced the compressor for a vibration problem @ idle no complaint of noise... vehicl left throwing out ice cubes... no vibration or noise... couple weeks later it returned with A/C belt thrown... checked for locked up pullies and found none s...
2002 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality VIN: 1GCHK23172
vehicle at times won't rev pass 2000 prms. scan codes p01093. all parameters on scan tool in-line.actual fuel pressure parameters desired and actual are within flow chart limit. need help thanks. Trouble codes: P1093 (fuel pressure problem)
2004 GMC Envoy SLE 4.2L speedometer VIN: 1GKDT13S84
tachometer intermittently increases above engine speed and will stay high when engine is shut off. if you turn key on and off several times it will settle back to being acurate. speedo will be way high sometimes too. we have checked the main ground under conso...
1995 Oldsmobile Aurora 4.0L overheating at idleblock test VIN: 1G3GR62C4S
Engine runs hot at idle,in the red when driven and let idle for 15 min. Cooling fans operating correctly, low speed and high speed. Scanner temp closley matches temp at thermostat housing (taken with infared thermometer). Thanks for the help !!
2000 Pontiac Sunfire SE 2.2L engine VIN: 1G2JB1241Y
This vehicle was brought in on the hook, no start, customer said it died while driving and wouldnt restart. Car was first taken to pontiac dealership near where it died, about 50 miles away from me, they put a reman pcm and still no start so customer had it de...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Cadillac Eldorado 4.5L ignition VIN: 1G6EL1159K
thanks for all the help !! The fix ended up a rat problem , it chewed on a harness that included the theft system I solved this problem with a shotgun, some solder and shrink. again thanks for the help! Dave
2000 Cadillac DeVille 4.6L Charging VIN: 1G6KD54Y5Y
sorry for the delay in posting a fix, but we werent sure on this one. after we installed the first alternator the charging voltage was low, after the second alt is was the same, apparently it can take up to 10 minutes to excite the field in these alternators, ...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GNCS18WXS
Thanks to everyone that replied. After checking and rechecking everything I was running out of ideas. All readings on Map, Iac, Fuel Trims etc. were fine. I tried a distributor and now it runs perfect. Thanks again for the help. Trouble codes: 44 (Lean Exhaust).
2001 Chevrolet Tracker LT 2.5L Idles high VIN: 2CNBE63481
We scanned this Tracker and could not find a reason why it wanted to idle high. Cleaned the battery cables and tested the charging system. Never found any reason for the high idle. As a last attempt to fix this truck we disconnected the battery cables and touc... Trouble codes: P0340.
2002 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2GCEC19T42
After running some checks to make sure of no vacuum leaks went a replaced the cat on the left bank and that solved all my problems,so thanks to all who sent replies to me it was greatly appriciated.All the O2 sensors are reading correctly & the rpm's steadied ... Trouble codes: P0300 (Random misfire).
1990 GMC V1500 Suburban 5.7L Surge, Cuts out, Stall VIN: 1GKEV16K1L
Thank you for all your replies. After talking to the customer directly, which from what they told our service advisor she had the distributor replaced already and it made no difference, we found out that they may have only replced the cap and rotor. Upon inspe... Trouble codes: 22 (tps voltage low), 33 (map voltage low.).
2003 GMC Sierra 2500 HD 6.0L #7 cylinder VIN: 1GCHK23U53
The problem was determined to be that the case hardening came off cam lobe for #7 intake. We replaced the engine.
1986 Oldsmobile Cutlass Ciera Brougham 2.8L MIL Lamp on VIN: 1G3AM19W6G
we installed a mass air flow sensor from the dealer and the light stayed off. the vehicle has been gone for 4 days. thanks for the help. Trouble codes: 33 (maf sensor error), 34 (maf sensor low).
1990 Pontiac 6000 LE 3.1L Poor Fuel Economy, MIL Lamp on VIN: 1G2AF54T1L
Thanks for all the help guys. I wasn't very clear in my request. Many were confused at the integrator readings w/ a junk O2, but we had already changed it. Sorry for the confusion. The problem turned out to be junk injectors. This car sits a lot. We replaced a... Trouble codes: 44 (Lean).
1993 Pontiac Grand Prix SE 3.1L Hesitation, Misfire, MIL Lamp on VIN: 1G2WH51T7P
I did not get the vehicle back in the shop at this time. I tend to think that the reason may be is that the customer does not want to spend too much money on the car. Might be the 345,000 kms?? :-) I'm a little disappointed with half of the replies, telling me... Trouble codes: 35 (51), 43 (Etc...), 53 (36 -), 36 (42 -), 42 (15 -), 15.
1994 Saturn SL1 1.9L Dash gauge VIN: 1G8ZH5599R
Thanks for all the help. I guess its going to have to go as is. We monitored the temp of the engine and the resistance for the sensor and all were correct. but the gauge still went to the red zone. we used a resistance box and along with the published specs an...
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