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Prev Professional Automotive Repair Technical Discussions for July 29, 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...
1996 Cadillac Seville SLS 4.6L Stall, MIL Lamp on VIN: 1G6KS52Y2T
hi i have this caddy that will die in gear at idle once it gets hot. at times it will die at idle in park-cold. upon arrival codes in history were 1599 and a crank or cam code or both. sorry but its been a while. after clearing codes and driving it. it would s... Trouble codes: P1599
2000 Cadillac Eldorado ESC 4.6L mirror fuse VIN: 1G6EL12Y6Y
Customer recently purchased this vehicle,keeps blowing underhood mirror fuse,interior lights also on the same circuit. Only blows fuse when vehicle is put into reverse,removed rear seat and both relays for back up lights,still will blow fuse when put into reve...
1990 Chevrolet Astro 4.3L rear doors VIN: 1GCDM15Z1L
hello to you all, couldn't beleave I have a problem with this simple project. I cannot seem to drive out the hinge pins on the rear doors on this 90 astro van. My last resort maybe to heat the sucker out, but I'm affraid I may damaged the paint. Have anyone fo...
1995 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13WXS
After replace Cat and Muffler looked at code P0138 on scanner. Rear o2 sensor bias voltage is over 1 volt when ignition first turned on, drops to .400 after couple minutes while o2 heater warms up. Will not drop any farther. Front o2 sensor bias voltage on s... Trouble codes: P0138
1999 Chevrolet Express 3500 5.7L Hesitation, MIL Lamp on, BACKFIRES INTAKE VIN: 1GAHGS9R2X
new tech getting old techs x's on acc van falls on its face the hotter it get the worse it gets but does it all the time but once it gets up to speed it runs good it also back fires through intake when acc fuel press good all the time and getting o2s down in t... Trouble codes: P0151 (ho2 ckt low volts b2s1), P0157 (ho2 ckt low volts b2s2), P0137 (ho2 ckt low volts b1s2), P0131 (ho2 ckt low volts b1s1), P0730 (incorrect gear ratio)
1999 Chevrolet Tahoe LS 5.7L Hesitation, Cuts out VIN: 1GNEK13R8X
when driving vehicle if you hit a pothole, large bump, or drive on a rough washboard type road vehicle will hesitate or cutou slightly but does not die. customer says at times it will turn on abs, srs,and mil lamps. We have never seen that.when it first came i...
2000 Chevrolet S10 2.2L extended cranking VIN: 1GCCS1457Y
hello all have as flex fuel vehicle with a intermittent extended has high fuel pressure 57/59 @idle, getting plenty of volume and pressure and no pressure drop after sitting,spark plugs were slightly corroded but was not able to duplicate symptom. ...
2002 Chevrolet Trailblazer LS 4.2L Hesitation, Stall VIN: 1GNDS13S42
This vehicle arrived with customers request to install a fuel filter to repair a stalling problem.(Problem just started that same day)After filter installation, vehicle was driven and seemed perfectly normal until about 5 miles into the testdrive. All at once,...
1994 GMC C1500 Sierra SL 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GTEC19KXR
Everyone in shop has spent time on this one. Co-worker condemned throttle body (without aid of ocilliscope) He replaced T/B with used unit to no effect. Boss has identical truck. He swapped T/B between trucks and subject truck runs great. He replaced T/B with ... Trouble codes: 44 (Lean Exhaust)
1998 GMC Jimmy Envoy 4.3L 2-3 shift VIN: 1GKDT13W6W
Hello all! Trying to help a fellow tech on this one. Vehicle winds up going into third gear, causing a mil and a third gear default which it will stay in until the mil is cleared. With a volt meter on the 2-3 command wire out of the VCM, it will apply shift wh...
1986 Oldsmobile Cutlass Ciera Brougham 2.8L hard start VIN: 1G3AM19W9G
hello all you gm guru's. i have this cutlass cierra that has an intermittent hard start issue. 90 percent of the time this vehiclestarts right away. on ocassion when starting this beast, it will crank for 5 to 15 seconds with out starting up. will pop and sput...
1986 Oldsmobile Custom Cruiser 5.0L Low Power VIN: 1G3BP3578G
C/S after I reseal the reman carb top plate and after new GM engine had been replaced car ran great for 3 weeks. Then C/S one day car made loud grinding noise under air cleaner area and gradually the noise wnet away the same day. Since then fule milage is terr...
1999 Oldsmobile 88 Royale 3.8L lights VIN: 1G3HN52K9X
The vehicle is now running and charging very well. The only problem that remains is lights won't turn off. If you cycle the twilight control off, on, off, the headlights only will go off. All the remaining lights stay on. We don't know what caused the initial ...
1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE12T5T
Trouble code for cam sensor, scope signal looks great, but unable to scope during the problem, I do get resynch counts on the Tech-2 during the episode, may only happen for 2 minutes at a time, once a day, It appears to have a new sensor and wiggling the harne... Trouble codes: P0341 (Camshaft sensor circuit performance)

Fixes & Summaries for GM
Fix/Summary Answers
1977 Cadillac Eldorado 7.0L hose nipple VIN: 6L47S7Q209
Hi all, Well, I received numerous responses to my question, and I explained everything to the owner including the fact that the old nipple might break on the way out, and also the possibility that the new one won't go in. Either way, the car would be undriva...
1986 Cadillac Eldorado 4.1L Excessive Emissions, low power VIN: 1G6EL5780G
all the responses i received were things we had already tried - no plugged exhaust, tried new o2 sensor, had cleaned throttle body vacuum ports, the oil was not contaminated, distributor checked out fine, we tried a new map sensor - the customer finally decide...
1990 Cadillac Seville 4.5L No Start, theft system VIN: 1G6KS5339L
Everyone got this one right Bad wires in steering column by switch/tumbler - First one I have run into with this problem, I'm sure by the responce it would not be the last. Some one had been in there before and resoldered wires and they got caught in the steer...
1990 Chevrolet C1500 Cheyenne 5.0L Hesitation, Misfire, MIL Lamp on, Lack of power VIN: 2GCDC148H3
Thanks for the replies 15 in total, the customer decided to purchase a used throttle body with injectors, he replaced it a week ago with no more hestation or lean misfire, the injectors fixed this one, thanks again. Trouble codes: 44 (Lean Exhaust).
1990 Chevrolet BOUNDER 7.4L power steering VIN: 1GBKP37N8L
motorhome had trapped air in power booster, system had special bleeding procedures, thanks for all the replies. thanks again gary for your phone calls. your info was very helpful,. diamond auto.
1992 Chevrolet S10 2.5L Hesitation, Surge, Cuts out, Misfire VIN: 1GCCS14A6N
I Put a ignition module in it and it helped a little the customer says he can live with the miss for now Trouble codes: 25 (Mat Readings Are Very High Around 200 Deg).
2001 Chevrolet Malibu LS 3.1L No Start VIN: 1G1NE52J71
Hello all, Bob from Arizona was on the right track. I think we actually had 2 problems. The first problem after replacing gaskets was the security light was flashing. We relearned the security system several times until light stopped flashing during cranking. ...
2001 Chevrolet Cavalier Z24 2.4L Idles Too High VIN: 3G1JF12T81
Hello again! I'm sorry, I have not had the opportunity to try some of the ideas suggested to me. I have not been able to have the customer bring the car back yet. I have had this problem with this customer in the past... they never seem to have the time to hav...
1999 GMC Savana 3500 5.7L drivers front VIN: 1GTHG35R7X
Thank you for all the help. All three responses I received for this vehicle were in relationship to the door flexing. The thoughts were to reinforce the door, and make sure the regulator is bolted tight. We were not able to get the vehicle from the driver at t...
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