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Prev Professional Automotive Repair Technical Discussions for August 13, 2007
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Open Help Requests for GM
Help Request Answers
1992 Cadillac Eldorado 4.9L ABS, Master cyl? VIN: 1G6EL13B4N
Hello all! I got this caddy that came in with excessive pedal travel. Only to find out I have no brake fluid flow coming out of Left Front and Right Rear wheels. When gravity bleeding fluid flows fine, only under pressure this problem occurs. The RF and LR whe...
1994 Cadillac Seville SLS 4.6L blower motor VIN: 1G6KS52Y1R
gm techs, 94 cad seville sls blower inop at times. enter on board diag no acp codes. ihave been following symptom for blower inop/improper blower speed chart 2 is telling me that i need to replace blower motor. so i went to double ck myself,motor wont fail aga...
1995 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6KD52B6S
This vehicle came into my shop with an intermittent stalling problem when the AC was turned on. It had codes for a shorted(po26), and open(po27)throttle switch.I checked the switch position data while driving down the road. It would go from open to closed inte...
1987 Chevrolet Astro 4.3L engine VIN: 1GNDM15Z2H
I am thinking about replacing the engine in my van. It is a 4.3 V6 with throttle body injection. I have access to a 5.7 from a police car. I beleive the 5.7 is from the early 90s. My plan is to use the tbi that came on the 5.7 with my current ecm and harness, ...
1989 Chevrolet S10 Blazer 4.3L Stall VIN: 1GNCT1820K
Sorry it has taken so long to get back with the fix on the 89 S-10 Blazer. After putting a new flywheel and starter in it due to both crapping out while diagnosing, I still had the same problem. Engine would run fine in limp mode but not any other way. I went ...
1993 Chevrolet Caprice Classic LTZ 5.7L Blower Motor VIN: 1G1BL8376P
Car was not driven for 3 years. New engine installed 2 months ago. When I shut off the engine the air conditioning blower continues to run for about 10 to 15 seconds. So far it always shuts off; but it has never done this before. Also, it works fine on low or ...
1998 Chevrolet Malibu 2.4L Engine VIN: 1G1ND52T4W
Hello all, Thanks for taking the time to read this. I have a car that is over heating. Antoher shop told customer it may be a head gasket because it was boiling out the coolant tank cap. We checked for head gasket by using shop air into the cylinders and brin...
1999 Chevrolet Tahoe LS 5.7L Misfire, Loss of power VIN: 1GNEK13RXX
Hi folks, Tahoe came in with a loss of power and miss complaint. We performed a complete tune up and vehicle still displays same symptoms but is getting worse. When misfire data is checked , number 3 and number 4 cylinders always show misfire counts, several ... Trouble codes: P0300 (Random misfire)
2001 Chevrolet Blazer LS 4.3L timing cover VIN: 1GNCS13W41
A question for the GM guys out there: Our other tech is doing a timing chain on a 4.3 S-Blazer, and due to time/space constraints, we're reluctant to pull the motor. In the "Old Daze", I remember trimming the lip on the bottom of the cover enough to allow rem...
2001 Chevrolet Cab & Chassis Silverado 3500 6.6L No Start VIN: 1GBJC3419F
This truck was brought to us at the recomendation of another good customer,when arrived found out was a cluster #*@!,had fuel leaking out under truck,had electric pump spliced into suction line,multible bad hoses on suction side,air cleaner melted,flex hose to... Trouble codes: P0087 (fuel rail pressure too low)
2002 Chevrolet Avalanche 1500 5.3L Misfire, VIN: 3GNEK13T92
Customer came in, originally, for MIL on- turned out to be Evap DTC's, with no other DTC's recorded. As an after-thought customer mentioned rough running at times- but that was not the main complaint--the MIL (which were Evap codes) on was her primary complain...
2004 Chevrolet Trailblazer EXT LT 4.2L Hesitation VIN: 1GNET16S54
Have a slight stumble off idle, under load. Vehicle will stumble light up to about 50mph. The key word here is intermittently. No check engine light. Happens quick, but what I think I see is a lean stumble (fuel trim, and o2 readings).Read archives, found simi...
2006 Chevrolet Malibu LT 3.5L engine VIN: 1G1ZT51846
Used Engine labor basic time, plus additional time for 3.5l p/s a/c & automatic, additional time for tune it or replace necesary parts to make it fit, thanks in advance, I have a car that damage engine in a accident & insurance is paying for!
1997 GMC Safari SLE 4.3L Poor Idle Quality, Stall, Misfire VIN: 1GKEL19W6V
here is my problem. i found the lower intake gasket leaking coolant. so i replaced the lower gasket, without removing upper plenum. everything went smooth until i started it. it started right up but with a noticeable random tick which sounded like spark arcing...
1998 GMC Safari SLE 4.3L system/ accumulator VIN: 1GKDM19W2W
Fellow technician guru's, this gm is blowing 65 degree air at idle and cruse. The pressures are 85/300 the compressor is on all the time, this is a CCOT system.The pressure never drops low enought to cycle the compressor. Keep in mind this is Arizona at 110 de...
1986 Pontiac 6000 LE 2.8L hard start VIN: 2G2AG19W9G
techs, this car is going to make me reconsider my profession. heres the deal, after a good amount of a wait, start engine the first time and all is well. if you immediately, about 2 seconds, turn the ignition off after you have started in, and then try to rest... Trouble codes: 12 (no rpm pulse), 34 (map/maf voltage low), 42 (est circuit open or grounded)
2000 Pontiac Grand Prix GT 3.8L Blower Motor VIN: 1G2WP12K3Y
When you go to turn the blower motor on,the day time running lights will go out and the blower motor will not operate. You turn the blower motor switch to the off position and the drl's will come back on. After a couple tries the blower motor will start and al...
1997 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZJ5279V
hello everyone, we have this saturn that came in with a hard start the first time it is started, then starts all day. code po340 is in the computer. we changed the ignition module and the crankshaft sensor, the car now starts right away on the first try, but t... Trouble codes: 340 (cylinder detect signal missing)

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Century Limited 3.3L injector pulse VIN: 3G4AL54N2L
Vehicle is fixed and running great. I should have posted this three weeks ago. Thanks to Mike from Ill. Gil from wisconson, Raymond from ohio, Ryon from Ca. And all the guys who gave me such great info. Turned out to be low resistance in two of the injectors. ...
1994 Cadillac Seville SLS 4.6L temp gauge VIN: 1G6KS52Y7R
Replaced Ecm. Ecm sending false info to cluster. No help from forum.
1992 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 2G1WN54T5N
After scanning the car further and thinking about the replies I found a lazy TPS. I replaced the TPS, Cleaned all the carbon from the EGR, And added some fuel injection cleaner. I asked the customer to drive the car the car for a few days and get back to me ....
1993 Chevrolet Lumina APV 3.1L No Start, Hesitation, Cuts out, Stall, Misfire VIN: 1GNDU06D3P
Thank you everybody for your suggestions. They made me rethink my diagnostic procedures. The crossfiring during cranking was caused by a defective distributor pick-up coil. I had tested and replaced everything else but because the pick-up coil was new and...
1996 Chevrolet Corvette 5.7L Clutch VIN: 1G1YY3254T
OK here we go. Sorry for the delay its been so busy we have not time to bring the car back in since removing the clutch. The costomer has cancer and has been in and out of the hospital and because he bought the first clutch I have been needing info from him. B...
1997 Chevrolet Malibu 3.1L Low Coolant Light VIN: 1G1NF52M6V
1999 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1447X
The end result was the vehicle had a stuck roll over valve in the fuel pump. I came to that conclusion when the tank built pressure i started unhooking the evap lines from the manifold back watching the scan tool to see if the pressure would bleed away i got a... Trouble codes: P0452.
1999 Chevrolet Blazer 4.3L air temp./blend door VIN: 1GNDT13W9X
I did tear down the instrument panel to get to the back of the control head and gain a visual on the actuator. I perfromed my electrical checks at the back of the head and failed the actuator. Althought the customer could not afford the repairs. Thanks for all...
2001 Chevrolet Suburban 1500 5.3L Unknown VIN: 3GNFK1GT91
Most guys pointed towards a bad fan cluth. Apparently fan clutch failures are common on these vehicles. I checked the fan clutch for play and leakage and it was ok. I did change the t-case oil as it looked petty bad. I am not sure if this helped or not. I have...
2004 Chevrolet Express 2500 LS 6.0L Misfire VIN: 1GCGG25U64
Well, once again we were banging our heads against the wall for no good reason. A common problem on these vans is the catalytic converters plugging. This would make the most sense given that we had the miss only on one bank. The problem I ran into here is t... Trouble codes: P0300.
2005 Chevrolet Silverado 1500 4.8L engine VIN: 2GCEC19V05
Several susgested piston slap causing the noise, however we inspected the cylinders with the pan off and did not see any scouring. The squeaking noise at idle was quite pronounced and would suggest a dry bearing. Another suggestion was a lifter that had turned...
2000 GMC Jimmy Diamond Edition 4.3L A/C controll VIN: 1GKDT13W7Y
Thanks to all that responded. The problem was fixed by replacing the ambient temp sensor. Thanks for pointing out that there was such a sensor, I missed it in the schematic. Sorry it took so long to respond back, as it is my personal vehicle, and we were ta...
1999 Pontiac Grand Am SE 3.4L Speakers VIN: 234TERG45Y
Ok I got the speakers wired up I ended up having to run knew wires from the stereo for the easiest repair thanks for all the help
2000 Pontiac Grand Am SE 3.4L ignition switch VIN: 1G2NG52E2Y
I have fixed this car. The shift cable would not release because the key would not turn. The Passlock wires also would not release because the key would not turn. I hammered the inner part of the tumbler out then the center slid out. When the center came o...
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