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Prev Professional Automotive Repair Technical Discussions for October 3, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick LeSabre Custom 3.8L electronic controller VIN: 1G4HR52KOT
we performed a water pump replacement on this vehicle. customer claims that now temp settings are showing in celsius. looked for a english/metric button with no luck. contacted local dealer who was nice enough to send over their shop manual. was unable to find...
2000 Cadillac DeVille 4.6L Vent actuator VIN: 1G6KD54Y4Y
Car came in with ac/defrost/vent actuator ratcheting. Took out the actuator O.K. with out removing dash, but can't get the new one in. The front door lever (next to the radio)has very little movement... almost none at all! Some of the levers fell out, but I go...
2003 Cadillac Escalade 6.0L a/c compressor VIN: 3GYEK63N33
Thanks to all for your help.I have 03 cad.escalade ext.No a/c.sys.had no freon.Recharge sys.Compressor not coming on.Tested low pressure switch tested good.I have 5 volt refer.voltage at high side sensor but it is a 3 wire switch.I'm not sure how it works so I...
1966 Chevrolet impala 327CID drum VIN: 168376Y101
need to know front drum max machining and discard specs. can not find a book old enough. no help from any local parts stores (can not even get me new one with out a lot of trouble). anyone know of a web site? or know the specs. please do not guess only replie ...
1989 Chevrolet K1500 Cheyenne 4.3L No Start, Poor Idle Quality, Surge, Cuts out VIN: 1GCDK14471
Truck has a surging idle, but when you first start it-it runs fine and then when it goes into closed loop it starts surging and runs rough. The gas readings that shows the HC=2100 at idle indicate a vacuum leak; none found. Scanner readings are blocklearn= 135... Trouble codes: 45 (Rich Exhaust)
1992 Chevrolet Corvette 5.7L ccm /bcm VIN: 1G23456789
Hey Gang, This is for the old time GM / Corvette guys I guess or anyone who may know how to go about getting this CCM flashed.. ( sorry about the incorrect VIN) I diagnosed a bad CCM (some call it BCM, GM refers to it as the CCM) for this 1992 'Vette, the sho...
1997 Chevrolet K3500 Cheyenne 6.5L front brakes VIN: 1GCHK33F5V
This 1 ton single rear wheel truck has had this problem before another tech replaced the hydra boost with a OEM booster. Well it's back. The problem occurs when coming to a stop and when you drop below 10 mph you can feel the front calipers release I dont know...
1997 Chevrolet Blazer 4.3L Hesitation, no power VIN: 1GNDT13W5V
hi everybody, hope you can help with this one. vehicle brought to me after all this work. runs like it has a resricted exhaust. did a backpresure test and found over 10psi. removed convertor & roadtested-still runs the same I rechecked distributor install -cam... Trouble codes: P0300
1997 Chevrolet K1500 Cheyenne 5.7L Cuts out, Misfire, MIL Lamp on VIN: 2GCEK19R6V
This truck came in for intake gasket leaks. While doing the intake, we noticed the ear was broke on the distributor. Replaced the distributor with new ac delco. vehicle returned within a week with the cam sensor codes.Found new distrubutor to be defective(or s... Trouble codes: P0340 (cam position sensor circuit), P0341 (cmp perfromance), P1345 (ckp/cmp position sensor correlation)
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3W
Vehicle is an interminent no start, usually when cold(40-50f). The fuel pump is operating. I have no codes and spark is present. When hooking up a test light there is no injector pulse. The engine will start and die imediatly. No codes and the security light i...
1998 Chevrolet Express 3500 5.7L Stall VIN: 1GBHG31R1W
Sorry for reposting on same car, but only allows one update, and am still having problems. This van has a problem where when you try to start it, it will start then immediately stall. It will usually start up the second time and run perfectly, on occasion will...
1999 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W4X
Help!! This car runs good upto 50mile/hr but if you go 65 & up check engine light flashes & set the DTC P0300. Checked compression--145 +- 10psi(Good), I replaced all the related parts(including MAF). but still same problem. I really appreciated your input on ... Trouble codes: P0300 (testing and results)
2001 Chevrolet Silverado 1500 5.3L starter VIN: 2GCEC19T71
hello all, i have a 2001 chevy silverado 1500 with an intermitent no crank. it has a new prndl switch, ignition switch & starter. and it still about every 10 starts or so when you turn the key nothing happens, but if you hold it over for 5 seconds or so it w...
2002 Chevrolet Venture LS 3.4L Hesitation, Stall, Misfire VIN: 1GNDX03E02
This truck is from a local scrap yard. They swapped the engine with the same year and size (3.4). This engine has 33,000 miles and has great performance with 02 staying at 900mv at WOT. This is a trusted scrap yard. At times when accelerating from a dead stop ...
2007 Chevrolet Silverado 2500 HD Classic LS 6.6L No Start VIN: 1GCHK23D27
This is a theft recovery. When cranking it has compression for a couple of strokes then sounds like it s freewheeling (sounds like a gas engine with a broken timing belt). The strange part is it builds vacuum on the exaust, and blows out the intake after the f...
1997 Geo Metro LSi 1.3L headlights VIN: 2C1MR2290V
I only have daytime running lights. When I turn on headlights with switch, lights go out, with no high or low beams. I do mostly A/C work so I have no wiring diagrams for the headlight system.
1994 GMC Jimmy 4.3L Excessive Emissions VIN: 1XCPK18349
I posted this machine back in July and you guys were of great help. The C0 level is low but the machine has a different smell coming out of the exhaust. It's not a rotten egg smell, I think it might be Nitrates of Oxides? Will an engine have a horrible smell i... Trouble codes: 42 (Ignition control error)
1999 GMC Savana 1500 5.0L Misfire VIN: 1GKFG15M9X
3 weeks ago van in for misfire, - checked and found #7 injector bad - replaced engine ran perfect. prior to coming to our shop , van had cap rotor and wires replaced at another shop. same complaint of intermittent misfire on #7. upon return van set code for mi... Trouble codes: P0300 (misfire)
2001 GMC Jimmy SLE 4.3L Steering VIN: 1GKDTI3WO1
rattle noise in left front sounds like susp or maybe something in dash replaced ball joints and shocks no clue sounds like steering shaft but you dont feel the rattle in the steering wheel
1992 Oldsmobile Cutlass Supreme 3.4L engine swap
Hey sorry for the lack of a VIN all. I have a real nice 92 Cutlass supreme available at the shop with a digital dash, full leather and a busted 3.4. I also own a 92 lumina with a 3.1 and an auto, but the body sucks. Anyone done a swap from 3.4 to 3.1? Just loo...
1998 Oldsmobile Silhouette Premiere 3.4L ABS lite on and RED brake VIN: 1GHDX03E8W
hey IATN crew, stumped on this van. I have looked at other posts and came up empty.. I went down trouble chart for c1256, came up with replace ebcm. installed a used one same symptom, tried another, same result. the abs and brake light on solid. if you hold th...
2001 Saturn L200 2.2L heater controls VIN: 1G8JU52F91
The heater control on this Saturn does not work; no blower motor, no lights, no nothing. The ign 3 relay located in the interior fuse box will not energize to send power to the ign 3 fuse that is also located in that fuse box. If you remove the ign 3 fuse that...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille 4.6L over heats VIN: 1G6KD52Y9V
Thanks for all the help, most replies we're head bolt and time sets concerns which we did .We removed the water pump again and found with force the shaft would slip in the pulley. replaced the pump with GM part and thermostat. car has gone 300 miles and no pro...
1986 Chevrolet Corvette 5.7L Misfire VIN: 1G1YY0785G
First of all thanks to eveyone who replied to helped me alot to narrow down the ended up being a bad was keeping up with fuel demand at an idle but when fuel demand increased it just couldnt provide enough juice. I replaced ...
1995 Chevrolet Lumina APV 3.8L Misfire VIN: 1GNDU06L4S
Harmonic Balancer had been replaced with after market balancer, Verified that it was correct part, Ordered new Balancer from dealer and corrected the problem. Could see no visable difference between the two Balancers Thanks for time and replies
1996 Chevrolet S10 4.3L No Start VIN: IGCCSI4XOT
Hello everyone I would like to thank everyone who replied.I think I confused some of you who responded to me and Im sorry for that.The biggest problem was there was no fuel pressure when you turned the koeo,that is why I was thinking fuel pump relay.I replace... Trouble codes: 151 (171 -), 171 (174 -), 174 (440 -), 440 (testing and results).
1998 Chevrolet Express 3500 5.7L Stall, Hard Start VIN: 1GBHG31R1W
I have yet to fix the vehicle, actually had to open another request. I did however receive some useful information. The most common answer was that I had received a defective pump, as it had to low of a cranking pressure should be over 60 I only had 55, which...
2005 Chevrolet Colorado Z85 2.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GCCS19855
This one is fixed. Almost everyone that answered said replace the cam actuator. Todd [...] hit it right on. Replacing the cam solenoid fixed it. As Todd mentioned 3 of the 4 oil passages should have screens on them, if one or more are missing , replace solenoi... Trouble codes: P0017 (CKP-Exhaust camshaft Position), P0300 (Random missfire).
1993 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN53L9P
after a wire by wire circuit check on the engine harness and ignition harness and pcm harness with a wiggle test on each wire,an hour into these checks an intermittant short to ground was found on circuit 645[wht/blk] that is a 10 volt feed to the cam and cran...
1997 Oldsmobile Achieva S 2.4L security light VIN: IG3NL52TOV
I ;m sorry for not sooner but waiting on them to come up with some money for the computer,I will post when i have the parts ,Eric
2000 Oldsmobile Alero GL 2.4L door locks VIN: 1G3NL52T2Y
Received replies relating to latch, neutral switch and bcm. Trying another good known latch and neutral switch changed nothing. Customer decided to just hit lock switch manually rather that tie up car any longer or invest any more money.
2000 Pontiac Grand Prix GT 3.8L No Start, Poor Idle Quality, Stall VIN: 1G2WP52K7Y
Thanks to all the problem was the MAF.There were no codes presen.When I removed the MAF I found the wires on the sensor had all sorts of paper like material on them and it looked like someone had tried to clean it with a wire brush.Thankyou all who responded
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