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Prev Professional Automotive Repair Technical Discussions for October 22, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick LeSabre Limited 3.8L No Start, Stall, MIL Lamp on VIN: 1G4HR54CXL
vehicle came in with a stalling problem and a code 42. our shop computer with mitchell on it is down and i do not have the book for this year or anything close to it. we have seen this problem before and it was always either the ecm or the ignition control mod... Trouble codes: 42 (est bypass fail)
1996 Buick Regal Custom 3.1L Hesitation, Surge, Cuts out, Misfire VIN: 2G4WB52M5T
car came in for a hesitation,surge, & jerking under acceleration, fuel pressure was dead on, volume was good, no excessive backpressure, when problem occurs the upstream O2 sensor voltage is 4 mv, problem occurs only when gas pedal is depressed more than 30%, ... Trouble codes: N0NE
1994 Cadillac DeVille 4.9L MIL Light Code 91 VIN: 1G6KD52B6R
This vehicle arrived with a code 91, defective or mis adjusted transmission lever postion switch. We tested it thoroughly via GM flow charts, the detailed 1 and 0 tests, repeatedly, and it passed. We replaced the switch, checked the alignment impeccably, went ...
1996 Cadillac Seville STS 4.6L Traction control VIN: 1G6KY5291T
Track Light on, Customer symptom shudder/pulsation in steering on turns. Codes P1644 (Delivered Troque Output Circuit) 73 (EBTCM TCS Internal Fault) I have limited information from All data and info from Mitchell is inconclusive. Any common failures related to...
1997 Cadillac DeVille 4.6L Blower motor VIN: 1G6KD54Y8V
We check voltages at blower motor according to my shop key information I should have 9 volts at terminal B with the fan in the low speed position I have 2.8 volts and in the hight position I have .5 volts. It says replace the ACM if voltages are incorrect. We ...
1995 Chevrolet S10 4.3L Misfire, MIL Lamp on, VIN: 1GCCT19W6T
Has set random missfire code several times over the course of 3 months of driving.(owner has cleared each time) Not acting up for us.We checked timing and found cam retard was at negative 10 degrees and according to our info it should be at 0 degrees.Truck run... Trouble codes: P0300
1996 Chevrolet Blazer 4.3L Dist VIN: 1GNCS13W3T
Hi, This is a simple one, but I am limited on my tech info. I searched the archives, but no specifics related to finding TDC on these. I tried to line up the left most line on the Crank pulley and point rotor to #1. I read that these Vortec CSFI engines are no...
1998 Chevrolet Tahoe 5.7L ABS System VIN: 3GNEK18R8W
This vehicle came in with customer complaint of ABS operating at slow speeds.Test drive indicates ABS system definitely comes on during last few feet of normal stop.No codes stored,checked all speed sensors output with both Tech1 and DVOM,all appear to be norm...
2000 Chevrolet C3500 7.4L No Start, Cuts out VIN: 1GBKC34JXY
HiIATN, I need your help once again. I have this Verizon fleet truck in my shop. Problem was that every so often truck would die and not restart, brought in on a hook and presto-vehicle would start everytime. Finally truck died the other day and found no fuel ...
2003 Chevrolet Silverado 2500 6.0L abs system VIN: 1GCHC24U63
any information requested on code c0550, turns out there is no information available to me on this code and i need to test it for the warrenty company. any response thst is accurate would be of help.
1995 Pontiac Firebird Formula 5.7L Light Motor VIN: 2G2FV22PXS
when you turn the head lights on they flip up and on ok, when you turn them off they go down fine but the left motor grinds for about [...], other than that every thing works fine has an after markert alarm system on it, and now when I unlock or lock my car...
1997 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1GZHX52K8V
I am stuck and looking for help this system is fairly simple. I have good flow from the exhaust and I do not have excesive backpressure at the egr. The engine vacumm is good at the egr valve. The valve can be commanded open with the tech2 and does affect engin... Trouble codes: P0401 (Insufficant flow for EGR)
2000 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WJ52J3Y
lite comes on after short drive , scan tool says low voltage to vent solenoid and we can't activate solenoid .with scan tool , but has full voltage when key on. Must be bad grounding circuit . Any one have a wireing diagram for this vehicle ?
2002 Saturn LW300 3.0L cooling VIN: 1G8JW84R42
car drove in with overheat,coolant recovery tank full of milky liquid,OE required dex-coolant,check oil cap and oil measure stick and found no coolant residue,motor oil full and clean. customer didn't add any foreign substance into coolant,remove thermostat an...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Electra Park Avenue 3.8L Poor Idle Quality, Stall VIN: 1G4CW5131H
Well leave it to the customer we found out the hard way that the harmonic balancer was from a buick lasaber. When we removed the original balancer there was only one tone ring. We went by the vin for the replacement part and got a balancer with two tone rings....
1997 Cadillac Catera 3.0L oil in the radiator VIN: W06VR5456V
I would like to thank everyone that replied. unfurtunally the customer did not want to pay for us to confirm that the oil cooler was leaking. but i would like to say it was very usefull knowleddge from every one that replied. thanks.
1972 Chevrolet K10 5.7L Lacks power
I received many replies to my question, most sugested checking things that i stated I had already checked. two sugested an ignition coil, a new coil did not help. I still could not find any problems with the engine and decided to time it by ear and it runs gre...
1995 Chevrolet G20 Chevy Van 5.7L speedometer VIN: 1GBEG25K1S
Thanks for the help Several mentioned the ignition switch as a possible problem. After going through the wiring there was a connector under the battery that should have been beside the battery. The connector had the power wire going to the transmission and w...
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge VIN: 2GCEK19T9X
Thanks to all who responded to our plee. We were reluctant to just replace the intake gaskets on the one without confirming the leak was there at all. We were advised by the customer that the dealer was sure it was the intake manifold (craked on the inside). S...
2000 Chevrolet Suburban 1500 LT 5.3L No Start, Stall VIN: 3GNFK16T0Y
Hi Fellas, Thanks to ALL for the help. It was the Fuel Pump. The Wire in the module was melted and shorting to another. Thanks Again, Paul
2001 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS14591
Sonoma was repaired with an new fcs. After replacement specs were 58hz. and an alc. content of 9% which is consistant ith our ethonal blend found here in IOWA. Thanks to all who responded below is there replies. Date: 10/20/2004 18:00:59 Probably, but firs... Trouble codes: P0178 (FLEX FUEL SENSOR OUTPUT LOW Hard Fault), P0179.
1999 Oldsmobile Silhouette Premiere 3.4L power sliding door VIN: 1GHDX03E3X
Good news group...i checked with my local olds /gm dealer about a service recall there were 3 recalls on this problem..they replaced the power module part #[...] and door is working like new ! and best of all no charge! Can't get much better than that. We o...
1994 Pontiac Grand Am SE 3.1L dome lights VIN: 1G2NE15M6R
Sorry for the delay. We finally figued out that the door switches were telling the chime module that the doors are always open. the customer had us disconnect the latch switches. Thanks
1997 Pontiac Grand Prix GTP 3.8L Starting VIN: 1G2WP5219V
Thanks to all who replied to my request...As it turns out, I looked over the factory amp...It was part of the radio circuit, and i crossed it off the list, thinking that i had unplugged it, but really haden't. It was a dumb error on my part, but lucky for me, ...
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