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Prev Professional Automotive Repair Technical Discussions for November 18, 2004
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Limited 3.8L Air Bag VIN: 1G4HR52K9W
We have codes B1021 (Driver deployment resistance high), B1036 (Discriminating sensor shorted) B1051 (Deployment commanded). Sometimes there are other codes but these come right back after the codes are cleared and even when we install another module the same ...
1990 Cadillac Fleetwood 4.5L MIL Lamp on VIN: 1G6CB5339L
Does anyone remember Cadillac on board diag?, have this one with intermitant "SVC ENG SOON" and "SVC VEH SOON" teltale lamps coming on and off, not always at the same time.The body module sets code F32,serial data problem,1st, then, PCM code E47 sets, both as ... Trouble codes: F32 (BCM codeBCM-PCM data problem), E47 (PCM/ECM codeBCM-ECM data problem)
1998 Cadillac DeVille 4.6L battery draw VIN: 1GGKE54Y4W
this car has a intermitent battery draw ,most times when it draws you can here it back feed through the speakers,leading me to believe i have a retained power problem ,the problem lies in where the rap relays are located in the fuse blocks in the trunk area.i ...
1978 Chevrolet Malibu 5.7L crankcase pressure
We have a perpetual oil leak. We fix one and the customer comes back a week later with another one. It started with oil coming out of the dipstick tube. We added a vent to the valve cover in addition to the PCV on the other one and took care of it. We have sin...
1991 Chevrolet Corsica LT 3.1L fuse melting VIN: 1G1LT53T1M
ok engine runs fine,ecm fuse (not wiring)gets hot even after bypassing fusebox to the point of actually melting the fuse.changed fuel pump,changed oil sending unit,disconnected and checked all fittings,sensors and relays,ohmed fuel injectors and they are well ...
1993 Chevrolet S10 Blazer 4.3L No Start
vehicle towed in no start customer replaced fuel pump and filter. car started ran rough then died out very shortly also alternator making alot of noise. Replaced alternator. restarted again ran rough then died and would not restart. checked fuel pressure no pr...
1994 Chevrolet G20 Sportvan 5.7L light on VIN: 1GBEG25K4R
hi everyone...this van has a abs light that comes on when driving about 12 miles or above if you slow down below that the light goes off i checked for codes with snap on scanner i see a code 52 .rear pwm valve circuit open but only see this for a sec then it d...
1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCT18W1S
thanks in advance car came in a couple of weeks ago mil on scan of ecm found p0401 removed egr valve found filter screen completely clogged with carbon also found egr filled with oil pulled plenum to check for clogged passages they were ok replaced valve road ... Trouble codes: P0401
1996 Chevrolet Express 1500 4.3L Stall, MIL Lamp on VIN: 1GCFG15W4T
If you start this van up it will start and run good. after a minute or two it will slowly start to bog and loose power. If I add propane the motor perks right up. Once it goes into closed loop the problem goes away. My gut tells me to replace the fuel pump. Bu... Trouble codes: P0171 (system lean), P0174 (system lean)
1997 Chevrolet S10 LS 2.2L no power VIN: 1GCCS1946V
This thing is acting like it has a restricted exhaust, but we have taken the exhaust loose . This did not change things. Fuel pressure is normal. It will idle but a little rough. When you try to accelerate it simple has no power.
1998 Chevrolet Monte Carlo LS 3.1L ABS module VIN: 2G1WW12M3W
Customer complains of antilock light coming on intermittently. No DTC's are stored. Looking at the data stream I noticed the abs voltage at 2.4 volts. I cleared codes although there were none found and both left and right abs solenoids clicked and the system r...
2001 Chevrolet C3500HD 6.5L Reverse VIN: 3GBKC34FX1
This vehicle is a 1 ton work truck. Around 2 weeks ago the driver noticed that the transmission would slip while driving down the highway. It would be fine, then rev up while slipping and then re-engage. The fluid level was checked, and found to be overfull. T...
2001 Chevrolet Tahoe 5.3L Poor Idle Quality, Misfire VIN: 1GNEC13T31
whats happening is that we have good compression,good fuel pressure,good spark,plugs are fine. it missing on #1 & 7 cly. have good vaccum. 17 in. no noticible signs of vaccum leaks, trying to figure out if the intake gasket could be leaking without no possible... Trouble codes: P0300
2001 Chevrolet Suburban 2500 8.1L MIL Lamp on VIN: 3GNGK26G41
after new cmp was installed, no problems @ first. cold start a couple days after replacement and light was back on w/ po343 only. Have scoped sensor, wiggled harness while monitoring cmp pid on scan tool(no changes) all circuits testing fine. I am suspicious o... Trouble codes: P0342, P0343
1995 GMC Jimmy 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKCS13W5S
95 s-15 4.3 v-6 a/t serv engine soon light intermittent- says obd 1 under hood and I can only find an obd 2 plug under driver side dash.when plugged in to my genisys otc scanner it says it can't communicate--can it also have aldl plug for obd1 which hood stick...
1996 GMC Safari 4.3L brakes VIN: 1GTDM19W9T
customer complaint when hard braking,comes to complete stop;whole vehicle vibrates. Takes foot off brakes for one second to two seconds reapply brake vehicle stops vibrating.Took out main relay for abs problem still exists. No brake shimmy problem.No brake noi...
1999 GMC K1500 Suburban SLE 5.7L theft deterrant VIN: 3GKFK16R3X
i have this suburban that i thought the fuel pump was going out. it is my sister's vehicle, a couple of weeks ago she called me in the morning and said her car would not start. i get there and it starts right up. this happened on two occasions. finally the car...
1995 Pontiac Grand Prix SE 3.1L lfters, engine oiling VIN: 1G2WJ52M5S
After intake re-installed, no start, no compression.Removed intake again,found valves not closing, all lifters highjacked. No amount of manually spinning engine or limited cranking (with intake still removed) would bleed lifters. Removed lifters from front ban...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Century Special 3.1L Cuts out VIN: 1G4AG55M0S
Sorry for the delay in closing this post, but I have been awaiting word from the customer as to whether the vehicle was actually repaired, but I guess no news is good news. I want thank everyone who responded, the suggestions were quite helpful. A few of you m...
1997 Buick Century Custom 3.1L passkey VIN: 2G4W552M0V
hello techs, thank you for your replies. several said to checkfor broken wire at the key switch. i had removed key cylinder and checked the resistance through full range of motion. there is no pass key module on this model pass key is through the bcm. securi...
1996 Cadillac Seville STS 4.6L Traction control VIN: 1G6KY5291T
Do to my limited diagnostic equipment ie red brick, I did not have the bi directional capability to properly diagnose this issue. I advised customer to take to dealer, but he has decided to live with the problem since it is minimal. Denny from Arizona says tha...
1991 Chevrolet Beretta 2.2L Rear brakes only VIN: 1G1LV13G8M
THANK YOU !!! to everyone who sent us information on this LABOR EATING problem. We just wanted to let everyone know that the problem is FIXED. We had been looking at the back brakes as the culprit when in fact it was actually the front calipers that were c...
1992 Chevrolet K1500 Cheyenne 5.7L interior lights 4x4inop VIN: 2GCEK19K7N
found bad wire in scuff plate area thanks don now the dome lights are off and the [...]
1999 Chevrolet Express 2500 5.7L starter VIN: 1GCGG25R5X
We found a 7volt leak across the park nuetral switch so we just replaced it. It has been gone for 2 weeks and a check was recieved so I'm sure that fixed it. Most thought Ignition switch but 1 enlightened person suspected the p/n sw. Thanks to all that respond...
2000 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R5Y
hello everyone, thanks for all of your responses sorry it took so long to close but we were waiting for the customer to drive it for a while to see if it acted up again. After all my testing i decided that it probably had bad fuel so i put 5 gallons of fuel in...
2001 Chevrolet Tracker LT 2.5L alternator VIN: 2CNBJ63481
I was not able to pin point the actual problem. After working countless hours tracing wires and replacing alternators I installed a band-aid. The car is covered by an aftermarket warranty company. I was paid 1.5 diagnostic time for all this time. My band-aid c...
1988 Oldsmobile Cutlass Ciera SL 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 2G3AM1135J
Thanks for all of the good advise, and I encourage others to view the replies to see possibilities that could apply to their situation. The car is fixed, but the repair could not have been more difficult to find. After all other options have been tried, we dec...
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