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Prev Professional Automotive Repair Technical Discussions for October 9, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Limited 3.8L HVAC control head VIN: 1G4HR52L6S
Hey Techs, I could really use some help with this one. I have this buick which is one of our techs and he is having a heck of time with. The HVAC control head won't power up and the blower runs constantly. This has steering wheel controls and duel climate cont...
1993 Cadillac DeVille 4.9L Cuts out
This car will die intermittantly;;leaving from a stop. Scanner says that a code E52 has been set,Checked all ground connections according to all data as well as power circuit.Then cleared codes and retest only to happen again.I changed the fuel pump thinking i... Trouble codes: E52
1999 Cadillac DeVille d'Elegance 4.6L No Start, no pcm data VIN: 1G6KE54Y8X
ok cadillac gurus, i need your wisdom... i have this cadillac that came in on the hook. customer thought it was the fuel pump, so i checked for psi,had none. so i checked fuses, fuel pump fuse was good, jumped the relay and had around 55psi. got the above code... Trouble codes: P0462, P0603, P1189, P1599
2001 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6JD54V21
Ok Gm techs, This is very intermitant. Cyl 8 and 6 have misfire history in the 2000-4000 range. cyl 2 and 4 are in the 50-300 range and mayjust be as a result of the major misses on 6 and 8. My fuel trim shows adding 34% at the freeze frame for the p0300 but o... Trouble codes: P0300
2003 Cadillac CTS 3.2L MIL Lamp on VIN: 1G6DM56N03
Car turns on mil light. Reduced power message comes on. Car will barely move under thses conditions. Only code found is p0700. I can unplug and replug throttle postion sensor to regain power,but mill light stays on. Trans will shift hard and no codes are found... Trouble codes: P0700 (tcm request mill on)
1995 Chevrolet C3500 6.5L Stall VIN: 1GBHC34F0S
Fuel supply pump works when cranking and full voltage is supplied to it(separate input during crank) and engine will idle for a while. However, while driving, it will stall- probably because voltage is too low (7.7 VDC measured across the connector pos and neg...
1995 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52M9S
this car was towed in for died and cranks no start - died while driving down hywy - has no spark and no injector pulse - tested all crank and cam sensor and all have signal - have power and ground to module, replaced module three different parts due to all sig...
1995 Chevrolet S10 2.2L Misfire VIN: 1GCCS1442S
This little chevy is driving me nuts. When you step on the gas going up hill the engine behaves like is has a weak coil or low fuel pressure. It bucks and back fires out the intake manifold. The fuel pressure is good, and I replaced the fuel filter, I install ...
1997 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS19X1V
I could use some advise on this one. 1997 Chev S10, has sat at our body shop for a couple years. I bought it and am trying to get it running again, it did run and drive when it came in. No spark, fuel pressure, fuel pump relay no fire, fuel gauge reads high on...
1998 Chevrolet K1500 Suburban LS 5.7L Unknown VIN: 1GNFK16R1W
Hello All, We have this Suburban that pulls to the right and the brake pedal will dive to the floor if your going less than 15 mph. We replaced both front calipers and replace the right front wheel speed sensor. We checked all lines and rear drums and shoes an...
1998 Chevrolet Venture 3.4L Cooling Systems VIN: 1GNDX03E5W
98 Chev Venture. Low coolant level light comes on. Coolant is full in rad and reservoir. Replace sensor. Light out. Customer drives for 2 days, light back on. Repeat. 2 days later, light is on. Coming back in tomorrow. Any insight on which direction to tackle ...
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEC13R7X
cyl 2 is still missing . when you start cold it runs fine after a few min it starts if you kill it and wate a few some timek it runs fine all day till next cycle .i did see fuel teims st 1 128 lt 1 128 st 2 130 and when missing lt 2 142 to 153 %st 1 0 lt 1 3 s... Trouble codes: 302 (cyl 2 miss fire)
1999 Chevrolet Blazer 4.3L No Start
car came in for a no start. scanner shows no injecter pulse but rpm. no timing advance. does not appear to be security related. no tcs. tries to start every once in a while then it shows a momentary pulse width then quits. guessing crank sensor. never seen thi...
2002 Chevrolet Silverado 2500 HD 6.6L not sure VIN: 1GCHK24172
a few months ago this truck had injectors go bad and replaced under warranty by gm.truck was picked up at dealership and when leaving would not go over 45 mph on highway.returned to dealer and picked up next day running much better.since this repair truck has ...
2002 Chevrolet Express 2500 5.7L Engine VIN: 1GCGG25R72
ATTN GM techs, we are looking for an oil consumption problem on this low mileage van. There are no signs of leakage. Runs normal, no smoke. It is using about a quart in 300 to 500 miles. The van is used by a local electrician and rarely sees any highway mile...
2004 Chevrolet Monte Carlo LS 3.4L ignition VIN: 2G1WW12E94
the original problem was when you put the key in the start position it feels like it goes in all by it self like something is controlling it now you have to hold the key in the start position for about 10 seconds before it actually cranks and starts. i underst...
1994 GMC C3500 HD 6.5L Hesitation, no power VIN: 1GDJC34F4F
hi everyone, i have this 6.5l desiel that had a missfire all the time in the shop. using mastertech i performed an injector bal. test and found cyl. #1, #8 not working, so i removes glow plugs and did a compression test on those two cyl. i had aprox. 350psi. s...
1996 GMC C1500 Sierra SL 4.3L Misfire, MIL Lamp on VIN: 1GTEC14W9T
Truck came with complaint of Check Engine Light comes on And Missfires. Road tested w/scan tool. No missfire & light not on. Bank 1 sensor 1 is switching fine but freeze frame showed Bank 1 Sensors 2 & 3 at 99%. Sensor 3 is before cat & 2 after cat. Fuel press... Trouble codes: P0143 (02 Low Voltage Bank 1 Sensor 3), P)300 (Multi-cylinder missfire)
1998 Oldsmobile Intrigue 3.8L engine VIN: 1GM24WC45H
heyeveryone. i have this 98 olds intrigue. came in with a coolant leak. found water pump leaking. replaced and car ran fine. didnt overheat. cameback this morning towed in and would not turn over. tried turning by hand and the engine will turn over about halfw...
2001 Pontiac Grand Am SE 2.4L Poor Idle Quality, MIL Lamp on VIN: 1G2NF52T61
See the related repair history on this high idle issue. Trouble codes: P0122 (tp sensor circuit low voltage), P0133 (os2 slow response sensor1)
1999 Saturn SL 1.9L high idle VIN: 1G8ZF5288X
Hi saturn techs. I need some help please. HAve a 99 sl1 or sl I don't know how to tell. Any way it has an intermittent high idle around 2000 rpm. Sometimes it runs fine sometimes not. With the a/c on you do not notice the high idle. There are no codes stored. ...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Rendezvous CX 3.4L Differential VIN: 3E54S58950
all good info.STILL TRYING TO FIND PROBLEM. cant find why solus says w\sped dis- yes all speed sensors are working.
2003 Cadillac Escalade 6.0L a/c compressor VIN: 3GYEK63N33
Thanks to everyone for your help.Turnes out that I had 2 issues.the high pressure sensor was bad.Replaced sensor and got compressor operation.High pressure went up to 450 psi before I shut compressor off.Fan clutch was bad as well.Replaced fan clutch. pressure...
1991 Chevrolet S10 2.8L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCCS14R5M
Injectors were the wrong flow rate. I pulled the injectors and found two different part numbers. (I have yet to identify the manufacturer of these units) Suffice it to say that they are not Delco or anyone else I am generally familiar with. A pair of reman inj...
2000 Chevrolet Tracker 2.0L motor VIN: 2CNBJ13C1Y
Thanks for all the suggestions. The new motor mounts arrived today and after installing them the vibration is gone. While the old mounts were not "broke", they did feel soft what I would describe as mushy, new ones stiff and tight. Without iatn I probably w...
2005 Chevrolet Impala LS 3.8L instrument illumination VIN: 2G1WH52K75
thanks for the help. turned out to be the switch melted down and took out the wiring. new switch and pigtail fixed it.
2005 Chevrolet Express 3500 6.0L Misfire VIN: 1GBJG31U35
Thanks to all that replied. After pulling our hair out on this one, listening to what help I recieved, I said I have to be missing something simple. We too service a fleet of these vehciles & have seen most problems. So I started to retrace our steps. The ... Trouble codes: P0300 (Random Engine Misfire).
2001 Geo Tracker 2.5L Poor Idle Quality VIN: 2CNBJ63411
Hello: Michael hit the nail on the head when he suggested a vacuum leak of some sort. Several others noted a real possibility of cam timing being off a tooth on bank #1 noting fuel trims following that theory. This is a 3 chain timed engine. I put the smo...
1964 Oldsmobile Dynamic 88 390CID Heater Core VIN: 844M251966
Thanks To All Who Responeded,I Called A Bunch Of Local Radiator Shops Because I'm Always Nervous About Buying Stuff Over Internet.After Talking To Radiator Shops Found Out They Were Just Ordering Part Over Internet And Doubling Price (They Qouted Me Around $90...
1995 Oldsmobile Aurora 4.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1G3GR62COS
This is a used car which we have not had time to work on recently. We did send it to a shop with a Tech2 for the TPS idle releasn procedure which eliminated the code 80, but not it is coming up with multiple codes, communication errors, so going to have to te... Trouble codes: 80 (TPS Idle learn procedure incomplete).
1999 Oldsmobile Cutlass GL 3.1L compressor VIN: 1G3NB52J1X
1988 Pontiac Bonneville SSE 3.8L No Start VIN: 1G2HY54C2J
ITS ALIVE!!! thanks to all who replied. the module was the culprit. replaced module and coil pack as an assembly and she purred. fuel pump still weak but cust. wants to recover from this bill b4 we go to town on it. again, thank you all for this valuable ...
1999 Pontiac Sunfire SE 2.2L head VIN: 1G2JB1245X
long story---when I originally pulled the head I couldn't find anything wrong with the gasket however it was badly warped. the machine shop couldn't find parts as it needed some work-I advised the office-ie service writer-that the head should be pressure check...
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