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Prev Professional Automotive Repair Technical Discussions for March 16, 2006
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L engine VIN: 1G4AG55M2T
replaced intake gasket and oil pump drive seal about 6 months ago car return with oil leak at at oil pump shaft seal area however after taking upper intake off it looks as if it may be leaking at head to block area wondering if anybody has had this problem bef...
1986 Chevrolet Corvette 5.7L ping VIN: 1G1YY6786G
After installing a rebuilt engine in this Corvette we noticed it pinged very badly I checked for TDC and found every thing mechanicly was in order. I then checked bace timing found it at 6 btdc which is where I had set it and is spec for the engine. Ithen chec...
1992 Chevrolet K2500 Cheyenne 5.7L No Start, Poor Idle Quality VIN: 1GCFK24K6N
good evening everyone. I have a friends 1992 Chevy K2500 4 wheel drive pickup with the 5.7 (350) engine. It came to me by way of a co worker from the local Ford Dealer who replaced the intake manifold gasket due to a coolant leak and the ignition module 'cause...
1993 Chevrolet S10 Blazer Tahoe 4.3L bogs warm VIN: 1GNDT13W1P
OK Chevy gurus, this blazer runs strong cold but once warmed up will fall on its face from about third throttle on. Acts like a restricted fuel filter as the more throttle given it "bogs" worse but letting up on accelerator it will pick back up and accelerate....
1995 Chevrolet Astro CL 4.3L No Start, Cuts out VIN: 1GNDM19W2S
this one is a little tricky.this van came in for stalling while in motion as if someone turned off key.it is NOT losing spark nor fuel pressure, something is cutting the injector out or something in the csfi, if i spray ether in intake just as it is about to d...
1995 Chevrolet Lumina LS 3.1L passkey ii VIN: 2G1WN52M0S
Every few week and some times months the customer has this 1995 Lumina towed in for a no start. The DTC is 46 Pass Key II system. Before I can do any test on the system the vehicle will start for me.The customer states that the vehicle will not crank. The igni...
1996 Chevrolet C3500 6.5L engine block VIN: 1GCHC33F8T
The engine in this truck broke a rod and the block. Have been trying to find used parts to rebuild it and not having any luck. Does any one know if you can use a 6.2 short block in place of the 6.5? Does any one know if any one makes an after market block sinc...
1996 Chevrolet S10 LS 2.2L Misfire VIN: 1GCCS1942T
This truck has an intermittent misfire. I could only get it to do this one time and it would misfire on cylinder #3. Customer says that when it misfires he can shut the engine off and restart it after several minutes and it would run ok. Vacuum readings are st...
1999 Chevrolet Silverado 1500 4.8L tcc VIN: 1GCEC14VXX
Hello everyone, I have a pickup here that comes in regularly for service that has a very randomly reoccuring [...]. First 2 months[3k. km.] then 4 months[12k km.]then 6mo. then 1month then 2months etc... It doesn't realy seam bad enough to justify the sonna...
2000 Chevrolet Cavalier Z24 2.4L engine noise VIN: 1G1JF12T6Y
hi all, this thing is making a noise, especially when in 1st and 2nd gear. it sounds like a broken flex plate, and it varies with engine rpm. i inspected the flex plate, its not cracked and the bolts are tight. the noise is still at the back of the motor, and ...
2002 Chevrolet Silverado 2500 6.0L temp VIN: 1GCHK29U82
we removed the small factory cooler and replaced with cooler that is 3 times larger. checked cooler flow found to be more than a gal per min. we pulled the unit back out and replaced pump assy and also replaced high stall conv with a low stall unit still have ...
1999 GMC Safari SL 4.3L Oil leak VIN: 1GTDM19W8Y
Vehicle towed in for excessive oil loss. First tech replaced the oil cooler lines as he thought this was the problem. As soon ay the engine is started, oil begins to flow from the area of the filter housing. I gave a quick look and saw all the casting cracks o...
1987 Oldsmobile Cutlass Ciera LS 2.8L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 2G3AJ51W1H
ok heres a gem. it is local body shop loaner car. the body shop tech (we'll call him ace!!) has spent hours diagnosing this vehicle. (more like replacing parts and adjusting things he shouldnt). anyways this car runs like crap. alreardy burnt up cat new exhaus... Trouble codes: 44 (lean exhaust), 33 (map signal high)
1997 Oldsmobile Bravada 4.3L Chassis VIN: 1GHDT13W0V
Under moderate acceleration there is a popping noise,sometimes once,sometimes twice.A reputable local transmission shop rebuilt the transfer case,because it sounds like the chain skipping teeth.
1992 Pontiac Grand Prix LE 3.1L Excessive Emissions, No Start, Poor Idle Quality, Misfire VIN: 1G2WH54T8N
Car came in on a hook. We pushed inside and found no spark. Replaced crank sensor and car started but ran very rough. Found two bad injectors so we replaced all injectors with new boush ones. Then we replaced plugs and plug wires. Car was much better but #6 cy...
1993 Pontiac Trans Sport 3.8L MIL Lamp on, trans wont up shift VIN: IGMDUV6L2P
thanks to all in advance. This van came in with a complaint of no upshift after 2nd. On my first roadtest it did shift into third after a while and enough speed. I came back and scanned the computer looking for a trans code, but instead came up with a lot of c... Trouble codes: 25 (Manifold Air Temp to high), 65 (Cruise Control Servo Position Sernsor/67Fault cruise control switch/68 Cruise control command problem), 66 (A/C Pressure Sensor/Circuit Problem), 69 (High pressure switch circuit), 88 (PCM Reset), 99 (Power Management Problem)
1995 Pontiac Bonneville SE 3.8L no start VIN: 1G2HX52K4S
car was towed in a couple days ago. car died on highway and would not restart. car will start at wide open throttle but sounds restricted like its starving for air or exhaust restriction. also back fires thru intake system while trying to start or when it dies...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Century Custom 3.3L Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 3G4AH5YN1M
thanks to all you guys for your help . i tryed a computer clear all codes send car for test drive drove it for 45 miles then check engine light came on intermittenly . hook scanner pull code 26 quad driver failuer change sevral computer and then it was finally... Trouble codes: 27 (2nd gear switch or circuit problem), 26 (quad driver module failure), 21 (throttle position sensor/circuit high), 43 (esc module for sensor circuit problem), 48 (misfire/fuel/ignition problem), 14 (coolant tem signal low or shorted).
1991 Buick Skylark 3.3L Poor Idle Quality, Hesitation, Surge, Stall VIN: 1G4NV54N4M
hello guys finally repaired this car replace knock sensor with delco unit and car idled fine and drove out good.thanks again for all your help
1995 Buick LeSabre Custom 3.8L Stall, MIL Lamp on VIN: 1G4HP52LXS
Well after many hours of reading wires and checking all of the 16 responces we found the problem, Yes it was the computer, now the car communicates with the scanner and also starts and runs well. So thanks to everyone who replied.
1994 Chevrolet Lumina Euro 3.1L Misfire VIN: 2G1WN14TXR
Thanks for all of the replies-most said to do a cylinder leak down test-tried that every thing checked ok.Customer decided to put a used engine in-runs fine.I bought the core and will post when i fine the problem
1999 Chevrolet Cavalier 2.2L valves VIN: 1G1JC5246X
yes car is running well,tank had contamident that caused the valves to get stuck open,thanks again
2000 Chevrolet Impala LS 3.8L No Start VIN: 2G1WH55K4Y
finally gone. sometimes we overlook basic problems. we had good fuel pressure, good spark & injector pulse. what we overlooked was fuel quality. after taking a sample and a good sniff and spilling some on the ground, which would not evaporate, quess what??? di... Trouble codes: P0300.
2001 Chevrolet Malibu 3.1L dreveability VIN: 1G1ND52J71
The fix was the battery replacement, hard to beleive but all tests were good on batt and charging system, with load, took a chance and on a hunch (professional term) and a prayer, vehicle ok since. Tech suggestions were, alternator marginal and battery can't h...
2001 GMC Safari SLE 4.3L MIL Lamp on VIN: 1GKDM19WX1
as mentioned,to relearn cam/crank on those vehicules ,,you have to bring to max rpm 10 times,then relearn is done and you can erase trouble code Trouble codes: 1345 (cam /crank degree offset).
2002 GMC Yukon XL 1500 SLE 5.3L No Start VIN: 1GKEK13272
James had it right when the tank got below a quarter, fuel flow was almost non existant. Changed pump with OEM unit everything worked fine. Upon inspection of pump by disection, we found that the commutator was very blue from overheating. Thanks to all for the...
1994 Pontiac Firebird 3.4L No Start VIN: 2G2FS22S4R
We still have the car but put it on the back burner in order to get other work caught up in the shop. Got an email to close this post so need to close it. Will spend some time on it tommarow and will start a new post tommarow in hopes of getting some fresh ide... Trouble codes: 82 (3x signal error).
1995 Pontiac Grand Am SE 2.3L engine VIN: 1G2NE15D1S
Well,I had alot of responses telling me to watch cam/crank sync. This motor does not use a cam sensor. Others said check coil cover. Turns out timing chain jumped, due to severe wear on gears. The tensioner was fully extended, and chain would skip over cams wh...
2001 Saturn SC2 1.9L Hesitation, Surge
turned out to be a bad coolant sensor cust wanted a tune and thats what he got he brought it back and i checked some parameters and thee iat was 77 deg. and the ect was 48 deg. funny the computer didnt set a code the dash also showed cold always the sensoing e...
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