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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 1, 2008
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Open Help Requests for GM
Help Request Answers
2000 Buick Regal GS 3.8L starting VIN: 2G4WF5511Y
This vehicle came to our repair shop and its not cranking. We check for codes in pcm and itís clear. We check for Bcm codes and found a code B1422 and the 10a fuses pcm,bcm relays is blown. We replace the vehicle battery and repair a short in right signal lamp...
2002 Buick Century Custom 3.1L front speed sensors VIN: 2G4WS52J32
i have a 2002 buick that is draining my time and wallet. the vehicle came in with 8 abs codes: c1216 ebcm command pressure release too long, c1221 lf wheel speed sensor input signal fault, c1222 rf wheel speed sensor input signal fault, c1225 lf excessive whee...
2003 Cadillac DeVille 4.6L starter VIN: 11G6KD54X5
i have a 03 deville that will not crank i have 13.5v at starter when ing is turned to start i have 13v at solonid wire.you can hear a little sound at starter but gear not engage. ihave cleaned ground at alt.an body battery cables are like new i also cleaned gr...
1995 Chevrolet Camaro Z28 5.7L Excessive Emissions, Hesitation, Cuts out, Misfire VIN: 2GIFP22P95
This car is at another local shop and I was called for a fresh opinion. This is the managers personal car and they've not been able to fix it long term. The water pump is not leaking. The distributor is dry. The car throws no codes at this point. Rpm is lim...
1997 Chevrolet Express 2500 5.7L long crank time cold VIN: 1GCFG25R7V
Have been living with this problem for several months, and after sitting for long period of time, excessive cranking time is required before engine will start. Any suggestions will be greatly appreciated. When new pump is installed, crank time is about 50% sho...
2004 Chevrolet Silverado 2500 HD 6.6L No Start, Hesitation, Misfire, MIL Lamp on VIN: 1GCHK242X4
So far I have not reproduced the problem. Thinking about my codes and their order of importance to me, I'm thinking that I'm losing my 5 volt reference voltage at or within the fuel press sensor. The reason being that is 2 codes are saying low voltage and 1 fo... Trouble codes: P0193 (FR Press Sensor Ckt High Voltage), P0405 (EGR Vac Sensor Ckt Low Voltage), P0642 (5 Volt Ref 1 Ckt Low Voltage)
2004 Chevrolet Astro 4.3L No Start VIN: 1GCDM19X04
help-van started out with a no spark-no start when hot and shut off-let cool off would be fine,now has no spark all the time,also no communication with my scanner,also no fuel gauge operation,before when communiction was there i also had spark and fuel gauge,r...
2007 Chevrolet Tahoe LTZ 5.3L alternator VIN: 1GNFK13077
Hello G.M. guys, This beast came in for its first service since being bought used. The customer mentioned that the ammeter was reading low intermittently on all driving conditions, and wanted a new battery just in case. We replaced the battery and tested the s...
1997 GMC K1500 Sierra SL 5.7L No Start, Stall VIN: 2GTEK19R7V
this ones got me stumped. it will stall while driving or on start up it cranks with no start. customer states that when this happens it seems as it is cranking fast then kind of bucks. had it towed in started right up ran for hours. fuel pressure is great, wav...
2006 Pontiac Grand Prix 3.8L Odometer VIN: 2G2WP58216
Mileage on odometer is accumulating different than the car is actually traveling. Drove car yesterday approx 105 miles, odometer registered 168 miles, first I thought maybe KM/H selected, that is pretty close to what the km would have been, but it does not alw...

Fixes & Summaries for GM
Fix/Summary Answers
1941 Buick roadmaster 322CID radiator
thanks to everyone lots of good advice , the problem seemed to be in the bypass check valve , a little brass disc thay is supposed to close when the thermostat opens , we inserted a freeze out cup in the bypass circuit and it seemed ok on a short test drive a...
2002 Buick LeSabre Limited 3.8L blower motor VIN: 1G4HR54K02
thanks to rolfe new motor was bad from gm hard to second guess a new dealer part but i guess quality evrywhere is going downhill - thanks for the help everyone
2002 Buick Rendezvous CX 3.4L tranny fluid
Had alot of replies.11 said to do.3 said have a 50/50 shot.4 said don't do.Others said first check for code P1811(run out of adaptive stratagies to make tran work correctly),If it has code do not do.If metal in pan do not do.Don't use additives or cleaners. If...
1999 Cadillac Seville SLS 4.6L engine VIN: 1G1CHWU935
removed thermostat and found to be defective replaced and worked great thanks for the replies
2003 Cadillac CTS 3.2L Poor Idle Quality VIN: 1G6DM57NX3
Jacked up on oil pan and vibration was less, so we replaced the engine mounts. Vibration in now gone. Thanks for the replies.
1987 Chevrolet Corvette 5.7L instrument cluster VIN: 1G1YY3182H
Upon further inspection, we found numerous cracks in the instrument cluster's circuit boards. We are currently awaiting the customer's authorization to replace the cluster.
1997 Chevrolet Lumina 3.1L Surge VIN: 2G1WL52M1V
Just to let everyone know. The car is fixed and it does have the 3 wire ect that no one but the dealer shows. The car returned today as the used ecm finally came in yesterday evening. I changed it out and everything works as it should. Temp. is where it should...
1999 Chevrolet Tracker 2.0L heater core VIN: 2CNBJ13C3X
thanks to all that replied, i replaced the heater core with a delco one, grounded the core to the engine block and replaced the radiator cap. checked for combustion is system, none found. checked for electrical current, none found. new cap is functioning propo...
2000 Chevrolet Astro 4.3L Hesitation VIN: 1GCDM19W2Y
Well, thanks to all that replied, several nailed on the head. The problem was the fuel pump. My pressure was a little low and once in testing it had trouble starting. I tried a volume test while running with the bleed on my pressure tester. The volume was ... Trouble codes: P0131, P0151, P0713.
2001 Chevrolet Venture LS 3.4L No Start, Cuts out VIN: 1GNDX13E11
Well this is why we get big bucks - NOT! We found the problem to be a loose fuse on the right side of dash, that controled the gauges. Hit dash on right side and gauges would work and car would start. Thank you to all who responded, the car is perfect!!! Al...
2002 Chevrolet S10 LS 4.3L Misfire, MIL Lamp on VIN: 1GCDT13W62
Thanks to all for your input. all your ideas were previously performed so I took a little extra time and thought about if the engine was really misfiring or was the computer thinking that there was a misfire. I ruled out all the possibilities as far as ignitio... Trouble codes: P0300, P0304.
2003 Chevrolet Silverado 1500 HD LS 6.0L Engine VIN: 1GCGK13U73
Found the problem. Thank you all for the help. Most replies suggested unbolting the convertor to check for a broken flex plate. One was for a starter stuck engaged. Special thanks to Michael from oklahoma and Ivan from Florida, They said I had the wrong head g...
2005 GMC C6500 6.6L lost high idle VIN: 1GBE5C1265
sent to dealer to have reflashed or new ecu since no wiring problems were uncovered during testing. All circuits tested ok and all signals were present to activate high idle but no activation was taking place.
1996 Pontiac Firebird 5.7L cooling fans VIN: 2G25FV22P1
Thanks for all the responses. After much debate and feeling like I was repremanded for not being thorough, we replaced the ECM and all is well. Sometimes all the fact just don't add up and 'educated' guesses are all we have to go on. Thanks for helping me with...
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