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Prev Professional Automotive Repair Technical Discussions for August 20, 2004
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L rotors/drums VIN: 1G4CW52L7R
This car developed a rotor warping problem about 6 months ago. I replaced the rotors twice thinking that the tire monkeys had used an air wrench when they did some tire work. The last time i installed Wagner second line rotors and hand torqued the lugs. Cust h...
1988 Cadillac Fleetwood 4.5L multiple electic devices VIN: 1G6CB5154J
This caddy shuts down many components after it warms up. All at once the following turn off: fuel data center, digital cluster, climate control (but compressor still cycles), radio, and wipers. I searched all the wiring diagrams. G100, G101, and G200 are goo...
1996 Cadillac DeVille 4.6L waterpump pulley on camshaft VIN: 1GGKD52Y0T
need help asap from you informed techs. water pump pulley on rear of camshaft on this northstar engine is worn out due to belt failure. how do you replace this pulley? it appears to have a lip (similar to power steering pump pulley) is this the correct way to ...
1991 Chevrolet Astro CL 4.3L No VSS VIN: 1GNDM19Z2M
Hello all. This van has no speedometer reading and VSS on scantool shows 0mph all the time... Once or twice in a 5 min road test the speedo will jump 2-5mph, and the scan tool shows the same, but returns to 0mph and stays there. This van has no speedo cable an... Trouble codes: 24 (No VSS Signal Received)
1992 Chevrolet Lumina Euro 3.1L speedometer VIN: 2G1WN54T3N
Hello fellow techs.. I am working on a speedometer & cruise control inop problem. Being that both items weren't working the first thing I checked was the vehicle speed sensor with my fluke meter. It changes in a/c voltage with speed. ( don't know what specs ar...
1993 Chevrolet Astro 4.3L No Start
1993 chev astro van with no start. CMFI system and injector pulse good at connector as well as at the injector itself. Replaced fuel injector assy. Injector shows 1.6 ohms. New one shows 1.7 ohms. Very good spark and in time, good compression, but still no sta...
1995 Chevrolet Corvette 5.7L Cam/Distributor VIN: 1G1YY22P9S
Howdy, LT1 mavens: This car has been essentially trouble-free for 6 years, except for a blown coolant hose several months ago, until it stopped DEAD in front of a non-GM dealer lot. They replaced many parts (coil, module, maybe ECM and/or distributor) and ret...
1996 Chevrolet K2500 Suburban LS 7.4L rotors VIN: 1GNGK26JXT
Hey guys, I think this is a no brainer, but thought I would ask anyways...I have a good customer that puts on 60,000 miles a year and every 16-25,000 comes in for "warped rotors". We verified it every time, and warranted them with new replacements. This "seeme...
2001 Chevrolet Suburban 1500 5.3L a/c tensioner VIN: 3GNFK16C21
The a/c belt tensioner vibrates wildly with uner a load. This customer was on the way to our shop for service unrelated to his a/c tensioner and his a/c belt broke. The belt did not look worn, it just broke. We replaced the belt and it broke again. We replaced...
1997 GMC Sonoma SLE 4.3L Heater Core VIN: 1GTCS19X3V
Truck came in with heater core leaking. After finding no traces of HC in cooling system, we installed an aftermarket heater core. Truck returned in about 6 weeks with heater leaking. Checked again for HC's and then installed an AC Delco heater core. Truck retu...
1999 GMC Yukon SLE 5.7L suspension VIN: IGKEK13R5X
this denali is kicking my but. the steering wheel shimmies at all speeds espically low speeds when hitting small bumps///but worse at 50 and 60 on a nice road it even feels like it shimmies more when you barley move the wheel to the right side while on a smoot...
1991 Pontiac Grand Am Value Leader 2.5L timing chain tensioner VIN: 1G2NG54U0M
This car came in to my shop in Jan 2002 with a noise in the front of the engine and an oil leak up front. I found a broken timing chain tensioner and a corresponding hole worn in the front cover. The milage at that time was 104451. The cust informed me that he...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Century Custom 3.3L No Start, Poor Fuel Economy VIN: 1G4AH54N1L
thanks to those who offered help, i hoped someone else had experienced and solved this problem and would still like to hear from them. we replaced the regulator one more time (previous times used gm parts) and to minimize cross firing risk, we replaced plug wi...
1991 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54C5M
Most everyone said to check the magnet, which we did before, and it looked okay. We checked it again anyhow and found the front of the plastic cage missing so when i put my screwdriver down there, the magnet came out completely. Put chain and gears and new mag... Trouble codes: 41 (CMP Sensor Failure).
1991 Buick Skylark 3.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G4NV54N3M
Thanks for all the replys on this one...This one will go down as a half failure...Computer,prom,ignition module,module harness...all replaced..Start car...runs perfect...BUT... if you shut the car off and restart the MIL light comes on, car begins to miss with... Trouble codes: 42 (EST Circuit Error).
1995 Buick Riviera 3.8L No Start VIN: 1G4GD2213S
Was unable to ever duplicate problem in the shop. Finally rolled the dice and replaced the ignition switch. All is well now and customer hasn't returned for 2 weeks with complaint.
1977 Cadillac Seville 5.7L No Start VIN: 6S69R70494
First, special thank-you to Gord for e-mailing the schematic the very next morning. Also, Glen gave very good specific advice on the fuel pump system. The fault lies in the ecm, the fuel pump relay which is internal in ecm, while it clicks it is not completing...
1995 Cadillac Seville SLS 4.6L blower
well thanks to all who applied.after much checking, everyone was right.even though there is a part number on the cage noone will sell it seperately.not even the bone yards. so i ordered a new one which will be in monday. thanks again to everyone.
2001 Cadillac DeVille DHS 4.6L instrument digital dash VIN: 1G6KE57Y41
hi tech Replaced a new battery fixed the problem,thank you for all the replies.CULATER .
1988 Chevrolet Camaro 5.0L Cuts out, Stall VIN: 1G1FP21E8J
Thanks for all the replies. Unfortunatley the customer has not been able to bring his car back again for me to look at it again. When he does I will double check the TPS again as so many replies mentioned that. A couple of people also mentioned a possible dist...
1988 Chevrolet Camaro 5.0L Cuts out, Stall VIN: 1G1FP21E8J
Thanks for all the replies. Unfortunatley the customer has not been able to bring his car back again for me to look at it again. When he does I will double check the TPS again as so many replies mentioned that. A couple of people also mentioned a possible dist...
1991 Chevrolet K1500 Cheyenne 6.2L black smoke VIN: 2GTEM19C2M
Cust. left truck until i could duplicate concern. Finally after several long test drives, i was finally able to duplicate concern. Got it to act up 2 times, it would go way down on power and pour black smoke out tail pipe, you wouldnt even see the cars behind ...
1996 Chevrolet Blazer 4.3L Mechanical VIN: 1GNDT13WOT
Thanks for all the replies, Seems that rotor finish is very important to these vehicles. A special rotor finishing device on the brake lathe works well for this. After the brakes break in real good, brake effectiveness improves. Effectiveness was not as good a...
1998 Chevrolet Tahoe 5.7L air conditioner VIN: 1GKEXK13RX
AT this time have only been able to make a 4 degree drop in temperature. Thank you guys for all the advice.
2001 Chevrolet Impala 3.4L starter VIN: 2G1WF52E91
I want to thank everyone for help with this car. we had no start concerns with this one. had several replies that were great help. Iam glad we have this resource. The impala had a bcm concern that would not let the pcm start the car. after repacing the bcm and...
1991 GMC Safari 4.3L Dies/w Brake Applied VIN: 1GDDM19ZXM
i got some good replies for this one. the fix was a new distributor. it had a cracked magnet in it. thanks for the help. bob [...]
1988 Oldsmobile Cutlass Ciera 2.8L Misfire VIN: 1G3AH51WXJ
Yep, You all were right!, most said to swap the coils and follow the misfire, replced bad coil, DOO dAH! thanx to you each and every one who took the time to reply, ALLDATA and the resistance test is worthless., Ken
1992 Oldsmobile Achieva S 2.3L ABS Module VIN: 1G3NL146NM
thank you for your replies looks like everybody leans toward a wheel speed sensor dropping out.I never got a chance to repair this car.
1987 Pontiac Grand Am LE 3.0L Stall VIN: 1G2NV54L6H
I want to thank everyone for responding-- I received replies within an hour of posting. Several replies said to check the egr to see if it was not closing quickly enough. I was told to disconnect it and drive the car. It still died. I had previously checked op... Trouble codes: 43 (esc).
2003 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K13
Well it's done and gone. After replacing the pcm (under warrenty) the car was still broke. Baro pid on scan tool still read 2.50 volts at koeo, must be scan tool issue. After I had a moment to reflect on my diagnosis, I realized I had not checked fuel quality.... Trouble codes: P0171 (Fuel trim system lean).
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