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Prev Professional Automotive Repair Technical Discussions for December 16, 2004
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L valvetrain noise VIN: 1G4AG55M51
hi fellow iatn guys, have this 1996 buick century with intake gaskets leaking antifreeze externally. replaced intake gaskets and now all the rockers are noisy. replaced valve lifters (rocker-roller type) and intake rockers are not oiling. have replaced lifters...
1992 Chevrolet G30 Chevy Van 7.4L Surge, Cuts out, Misfire VIN: 1GBKP37N3N
This vehicle has tbi and I was wondering if anyone has the spec on what wot injector pulse width would be?
1994 Chevrolet S10 Blazer Tahoe 4.3L Shift on the fly VIN: 1GNDT13W5R
Was shifting to 4HI & 4LO front drive shaft spinning but front axle not, had Vac. at S/W but plugged in wrong, put it on the right way and the system worked. Tried it a couple of times then it stop shifting. no rocker S/W light accepted for key test. I unplugg...
1997 Chevrolet K1500 5.7L Excessive Emissions, Poor Idle Quality, Surge, Misfire
Engine ran good for 14 months. Problem started suddenly. Misfire codes P0300. Major tune, Cap, Rotor, Wires, Plugs, Fuel filter. Idles fine for a few minutes then surges and stalls. Would not fire out of 4 legs on the cap before replacement. Traced disconnecte... Trouble codes: P0300 (Random misfire)
2000 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG39R4Y
hello this van came in with a misfire. we did a basic tune/up. van came back next day missing again. code p0340b always resets after starting engine. replace cam sensor twice and checked wiring. the clue to this problem is when the engine is missing and i mome... Trouble codes: P340
1997 GMC Jimmy SL 4.3L Head Gaskets VIN: 1GKDT13W5V
Merry Christmas everyone: We have just changed the head gaskets in this Jimmy, and a few days later it is doing the same thing. Lots of air in the cooling system and intermittent loss of heat from the heater as well as overheating. Previously about 2 months ag...
1999 GMC Savana 1500 5.7L engine misfire VIN: 1GDFG15R6X
Van came in to replace two fuel injectors (#5 and #7) due to misfire codes(Engine misfired under heavy loads but ran good at idle and under light load)). We are assuming that while we took the upper intake or plenum off we disturbed the lower intake manifold g...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Cadillac Eldorado 4.6L mil hard shift VIN: 1G6EL12Y1R
hey guys this was incorrect gear ratio from dealer. dealer fixed for free. but waut it gets better. they were unaware that the initial diagnosis was to replace the defective computer. did not take the time to find out trhat it was there ecm that we installed j...
1989 Chevrolet S10 Blazer Sport 4.3L cyl. 1,3,5 VIN: 1GNCT18Z9K
WE GOT THIS ONE FIXED IT WAS THE EXHAUST VALVES ON THE LEFT HEAD. I would have never thought it because of the good compression.
1995 Chevrolet C2500 Suburban 7.4L Excessive Emissions VIN: 1GNGC26N9S
Thanks for all the replys. Most of them focused on the EGR and some on using the Lamda calculator and emissions triangle. I had previously removed the EGR and made sure I had exhaust and intake vacuum at the ports, so plugged ports were not the issue. One neat...
1999 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDU06E1X
Thank you all for your help, you hit it on the head. The Intake EGR passage was partialy clogged. Cleaned Passage & it is fixed..Thanks for all the help. That is what makes this system great Dale Trouble codes: P1404 (EGR Closed Position Performance).
1992 Oldsmobile 88 Royale 3.8L no spark VIN: 1G3HY5316N
thanks for all the great replys. problem turned out to be a bad ecm. replaced it and all was well. special thanks to Tom for talking to me on the phone and helping me sort some things out.
1998 Pontiac Sunfire SE 2.2L Air Bag Lamp VIN: 3G2JB1241W
Starting with Ken, thank you. I checked the Remote-start install yet another time, and all was well. Chris from ON and Dave from from PEI told me how simple the system really is. I pulled the passenger seat, sill plate and seat belt, lifted the carpet enough t...
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