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Prev Professional Automotive Repair Technical Discussions for November 15, 2005
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Open Help Requests for GM
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1992 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP53L2N
Heres the problem this car runs fine and we are stumped. It was in about 3 weeks ago for this problem and now it is back for the same code. We replaced all of the above components, and we thought it was fixed. we removed the cam sensor when it was in the first... Trouble codes: 41 (cam sensor fail)
1990 Cadillac DeVille 4.5L Climate Control VIN: 1G6CD5338L
Hello, techs! I have a problem child Caddy. This is a clean, well maintained car owned by one of our best customers. The climate control will work fine for a while, up to 10 miles sometimes, then I hear a relay clicking [I think the rear defrost relay] and the...
1993 Cadillac DeVille 4.9L whole car VIN: 1G6CD53B8P
car origionally came in for broken swaybar links - replaced - came back in apparently the boots were both nicked with the cutoff wheel - so we replaced both axles (for free) - customer left to go get new tires from tires plus - customer went back to the tires ...
1978 Chevrolet El Camino 5.7L fuel pump VIN: 1GLLW80K3B
Fuel pump noise, clatter like a lifter on zero miles reman engine. Are there different pump rods this one seems to short, can it have wrong cam? The rod retracts up inside the block more than normal it seems. Rod out of unknown year V8 chevy engine.
1987 Chevrolet Camaro Sport 2.8L Misfire VIN: 1G1FP21S7H
This is my son's car. He is 9 hours away from me. Complaint is low power and engine shakes. Check engine light NOT on-no codes. He heard a "pop" under the hood, and then the symptoms. I went there with limited equiptment, a scanner and vantage. No codes. Dead ...
1996 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R0T
Customer complains that it would not start intermittently. Finally it just quit starting. Checked for spark at plugs okay. Checked fuel pressure, normal. Check compression, okay. Could it be ignition switch not powering up a circuit Jaime
1996 Chevrolet K2500 5.7L Poor Idle Quality, Cuts out, Misfire, NO POWER VIN: 1GCGK29R5V
I have disabled the injectors in cylinders 5 and 2 and found no change in idle speed but noticed idle speed drop in the other 6 cylinders. The compression is 165 to 170 lbs cranking in these 2 cylinders. This truck was tuned up 500 miles ago with new AC spark ...
1997 Chevrolet K1500 Suburban LS 5.7L Power loss VIN: 1GNFK16R7V
Hello GM masters, please help. This high mileage Suburban is in good condition with mostly highway miles. Before coming here, the truck has had significant work to correct a low power situation that occurs on hard acceleration right around 3000-3200 RPM's. The...
1997 Chevrolet Lumina 3.1L Poor Idle Quality, Misfire VIN: 2G1WL52M2V
vehicle came in with a dead miss. check engine light on code 304. #4 injector was stuck so we replaced all injectors. vehicle came back 3 days later ,customer complaint was low idle or surge. no ses light and no codes stored.so i looked at and experienced inte...
1998 Chevrolet Blazer 4.3L Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNT13W4W2
Truck came in codes PO171, PO131,PO300, PO1870, and running rough. Found bank 1 sensor 1 dead and all plugs on that bank black. Replaced HO2S and did a major tune-up truck ran great. Came back 1 week later HO2 sensor dead again and plugs fouled. Replaced HO2S ... Trouble codes: P0171, P0131, P0300
1998 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03E7W
I would like some help with this code, P0440A. I have changed the purge valve, the evap. canister vent valve and the fuel tank cap. All seemed ok until customer came to get vehicle and MIL came back on. Checked code and got same P0440A according to OTC tester.... Trouble codes: P0440
1998 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W5X
This van was towed in for a no start, engine cranks normally, but about every revolution fires violently through the intake. Came in with a crank sensor code, scoped signal, not very good, replaced, no change. Also checked crank circiuts per trouble chart. Fue... Trouble codes: P0337 (Crank Sensor Circuit Low Frequency)
2002 Chevrolet Venture LS 3.4L valvetrain VIN: 1GNDX03E12
hey folks , Just wondering if this seems to be a common problem or not ,vehicle came in with what sounded like a broken rocker or collapsed lifter noise .We took it all apart ,replaced the lifters (on definately seemed collapsed) ,however ,upon start up ,same...
2002 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22GX2
hello friends, this vette is a crank but no start, no ignition and no injector pulse, many modules have codes set. we are only getting 3 volts to crank sensor, check wiring from pcm to crank sensor, all data shows should have a 12 volt reference. if we crank a... Trouble codes: U1016, B2860, P0341, P0336
2002 Chevrolet Silverado 1500 4.3L distributor VIN: 1GCEC14W62
this vehicle disturbs me to no end because the dist drive gear we found when we checked for a possible timing chain failure. the gear was over half gone and on one side the teeth halfmooned we put a new dist in vehicle runs fine now but the issue is the debris...
2003 Chevrolet Express 2500 5.3L No Start VIN: 1GCHG39RX2
Van would not start, towed in, hit fuel tank with hammer started, install new fuel pump went 2 days would not start again. Customer thinks (not sure) the fuel pump was not coming on. Went up to check van at his house and it started, had for 2 days started fine...
1994 GMC Sonoma SL 2.2L Belt VIN: 1GTCS1448R
Ok Techs...Got a question on this belt tensioner for a rear wheel drive 2.2... The way it looks now, the tensioner pulley actually touches the crank pully..and the belt can be removed (with some work) without even loosing the tensioner. So before I tell custom...
1995 GMC K2500 Sierra SL 5.0L Clutch VIN: 2GTFK29H0S
This truck arrived with a destroyed cluth disc and rear brakes frozen solid. We repaired the brakes and replaced the clutch kit. We could not get into gear in first, second or reverse with out grinding. Third, fourth and fifth would engage with some force. I t...
2002 GMC Sierra 1500 SL 5.3L coolant VIN: 2GTEK19T02
Customer complaint- coolant loss. First time customer and just had his oil changed so oil was clean. Pressurized system and found no external leaks. Put dye in coolant. Reinspect two days later and found dye in oil and customer also advized that he has develop...
1999 Oldsmobile 88 Royale 3.8L Stall, MIL Lamp on VIN: 1G3HN52K6X
Car came in two weeks ago with rough idle and check engine light on. 2 codes found. Random missfire and Mass air flow circuit signal low. Replaced air filter, fuel filter, PCV valve spark plugs and wires. Car ran beautiful. Let run for 25 min, Mass air flow co... Trouble codes: P0102 (Mass Air Flow Circuit Signal Low)
2000 Oldsmobile Silhouette Premiere 3.4L level control VIN: 1GHDX13E6Y
customer complaint air shocks no pump. fuses good, pump will run when hot wired, relay good, can close points on relay and pump runs. can ground yellow wire on s443 circuit and pump will run. think i checked the right grounds. checked the ones on wiring diagra...
2001 Oldsmobile Aurora 3.5L MIL Lamp on, Evaporative System VIN: 1G3GR64H61
Hi again best techs in the world, I'm needing help on this Aurora. It keeps setting a P0440 (Evap system "problem". May also be defined as large leak detected??). This car has been to several shops and a dealership for this fault. So far no one can find it. ... Trouble codes: P0440 (Evaporative System Fault large leak detected)
1988 Pontiac 6000 LE 2.8L Poor Idle Quality, Hesitation VIN: 2G2AF51W8J
car came in like it is,when it warms up it idles rough and fluxuates up and down around 600-800 i have replaced the mass air flow sensor. with no fix...I found a fuse blown for the mass air sensor relay. replace the fuse with no real change. i also noticed tha... Trouble codes: 34 (mass air flow sensor or circuit)
1994 Pontiac Grand Am GT 3.1L 4th gear VIN: 1G2NW15M8R
Hi guys, this is my sons car. Transmission appears to lock-up when it shifts to overdrive. By lock-up I mean engine will bog down considerably, like applying the brake hard,and R.P.M. will drop. If you manually return to third gear everyything is ok then. I ha...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Roadmaster Estate Wagon Collector's Edition 5.7L No Start VIN: 1G4BR82P1T
Well this one is fixed, thanks to everyone who replied. After receiving the replies I deceided to take a closer look at the distributor. Even though I could see no problem when I removed the cap I went ahead and removed the distributor assembly, when I got it ...
1982 Cadillac Seville 4.1L No Start, Stall VIN: 1G6AS6985C
Well now with the seasonal drop in air temperature on Long Island the vehicle is running very well and starts all the time so far. I have received two replies to check the air intake temp sensor and the engine heat sensors, maybe there is a connection will hav...
1988 Cadillac Seville 4.5L ac VIN: 1G6KS5155J
Thanks for all the help on this,but I have to fix my vehicles.Pull the BCM and ECM out,used a torch file and cleaned the connecters,BCM had reported low voltage,and voltage drop test on ground connecters was high,so clean up grounds and feeds,reset BCM ECM wit...
1995 Chevrolet Blazer 4.3L ignition-dash VIN: 15DF5E6HKU
thanks to all replaced ignition switch all is good pretty much all said the switch thnks for the help
1999 Chevrolet K2500 7.4L Brake Pedal VIN: 1GCGK23J5X
I found that the hydrobooster was weak per test procedure from Mike [...]. The test I did to determine this was with KOEO press brake pedal several times, then hold down pedal and start vehicle. Pedal should fall away then push back up; it it not. I replaced hy...
1999 Chevrolet Express 3500 5.7L Hesitation VIN: 1GCHG39R4X
We cleaned the maf and that seem to have fixed it. The temp has been warm the past week or so. Cold weather is coming this week. Thank for the help.
1999 Chevrolet Tahoe LS 5.7L radio VIN: 1GNEK13R1X
Thank you everyone Scott, Steve, Seth, Tony, Barry and Jerry for responing to my radio problem.I looked at all the replys, they were all good and straight to the point.I took Steve's ideas and pulled the radio out and found the bulbs but,finding replacement bu...
2000 Chevrolet Silverado 1500 5.3L message center VIN: 15DF5E6HKU
you guys are great sorry so are the ladies replaced the 4x4 switch all looks good now i can go hunting
2002 Chevrolet Express 3500 6.5L No Start VIN: 1GBJG31F92
This truck had a bad injector pump & went back to dealer under warranty. thanks for all the GREAT information !!!
2002 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDX03E02
The vehicle came back and I checked to make sure that the vent and purge solenoids clicked on and off. I also checked for other codes besides PCM codes and none were found. I also looked under the carpet (by the left sliding door) at the connector and it was d... Trouble codes: P0440 (Evap system - Large leak).
2002 Chevrolet Avalanche 1500 5.3L all gauges VIN: 3GNEK13T93
Thank you all very much, it was what most of you said , the grounds, something that we tech tend to miss out on diagnostic, you look at them and they look good and clean, ( a new truck?)but you dissconect them and see that they are corroided(We are at sea's eg...
1999 GMC Savana 3500 5.7L Surge, Cuts out, Stall VIN: 1GTHG39R1X
thanks for all the replies,i actually had 2 vans with the same problem,both turned out to be a restriction in the trans cooler lines..we temped in an external aftermarket cooler on 1 of the vans first,and low and behold it didn't stall any more.the fix was sug...
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