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Prev Professional Automotive Repair Technical Discussions for February 23, 2006
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Limited 3.8L fuel gauge VIN: 1G4HR52L2S
This car came in with the fuel tank leaking so I replaced the tank with a new tank and new sending unit. After installing the new tank and sender I put the gas back in the tank turned the key on and guage reads empty. I drained tank took back out hooked sender...
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1998 Buick Century Custom 3.1L water in oil
Hello all, this vehicle came in last month with water in oil, bottom end wiped out. replaced engine with low mileage bone yard unit. replacement engine was very clean, oil was noticably used but not filthy. well now its back, customer has put less than 500 mil...
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1993 Cadillac Seville STS 4.6L Cylinder heads VIN: 1G6KY5292P
Hi Techs, we have a northstar engine that is pumping coolant and we are removing the heads,this is a first for us. Our book says it is recommended to remove the powertrain then remove the heads. Can this job be done without removing the powertrain? We are more...
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1997 Cadillac DeVille 4.6L Cuts out, Stall VIN: 1G6KD52Y1V
Ok Good Afternoon I have this Caddy that my customer brought in with the concern that it sometimes stumbles and sometimes dies out.To date it has happened to us once and that was on the way to pick the customer up after driving it for two days.Here is what we ...
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1986 Chevrolet S10 2.5L Stall VIN: 1GCB514E5G
This truck has a stalling problem it starts and runs ok and will sit and idle just fine, but when you go down the road it drives ok but when you slow down to stop it stalls. It will also do this when you back up as soon as you let off the gas it stalls but you...
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1996 Chevrolet Cavalier 2.2L Cuts out, Stall VIN: 1G1JC1246T
I need a little help with this one guys. Customer came in last week and said vehicle would die on parkway and restart after a few minutes. No codes, ign scoped good found really dirty fuel filter. Replaced filter and returned to customer. Drove fine for a week...
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1998 Chevrolet Express 3500 5.7L oil pressure VIN: 1GCHG35R3W
VAN IS LOADED HEAVY AND IS A WORK TRUCK,ENGINE HAS A ERRATIC IOL PRESSURE WITH NO CONSISTANCE.AT 45 MILES AN HOUR MAINTAINS AT 45 PSI,AT A STOP IT WILL DROP TO 25 PSI AND SLOWLY GO TO 0 PSI.aFTER SITTING IT WILL RATTLE ROCKERS AND WILL CLIMB UP ON A SLOW ACCEL...
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1999 Chevrolet Silverado 1500 5.3L No Start VIN: 1GCEK19T5X
When the truck would not start agian after the two months the same tech went up and checked fuel pressure it was at 55 psi. The tech said the pump is bad again and will need to be replaced. After we had the truck towed to the shop and it set inside for a perio...
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2000 Chevrolet C2500 6.5L Dies VIN: 1GCG29F3YF
Complaint by driver is dies at times wont restart right away. Did restart After siting 20 minuets Has happened several time but not while Compatent technician is around to test.When some one compatent is around it starts fine. We are aware of the injector pump...
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2002 Chevrolet Silverado 2500 HD 8.1L transfercase VIN: 1GCHK29G12
truck came in trans fluid dirty sent to dealer to have serviced, got the truck back finished inspection had truck detailed, couple days later service 4wd light came on with code p1518 checked connectors all clean no corrosion found checked grounds and powers a...
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2003 Chevrolet Silverado 2500 HD 6.6L trans shift faults an d lack of power VIN: 1GCHK23133
well i got my self into a good one. this truck has an intermitant shift problem with multiple codes. local dealer spent hours and lots of his money with no resolve. i have gone through the gm trouble trees step by step. repaired chafed wiring by prndl opened u...
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2003 Chevrolet Express 1500 5.3L MIL Lamp on VIN: 1GCFG15T93
Any GM tech's out there. Help!! This van came in with a mass air flow code and lean fuel trim codes. The truck was running rough and stalling. We replaced the mass air flow sensor and the mass air flow code went away the truck ran much better. The mil light ca... Trouble codes: P0171 (Fuel trim lean bank one), P0174 (Fuel trim lean bank two)
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2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S24
Any help is appreciated! Mil lamp on. Customer is concerned about light. Only very slight hesitation or bump. Almost feels like transmission hesitation,but see no problems. This hesitation rarely occurs. Scanned and found P0410 Secondary air injection. Checke... Trouble codes: P0410 (Secondary Air Injection system)
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1992 Geo Tracker LSi 1.6L Poor Idle Quality, VIN: 2CNBJ18U1W
Hello fellow techs:I need help on this 1.Vehicle had a bad pressure regulator (fuel in hose) Replaced regulator vehicle ran fine for 1 day then it came back with idle speed at 300rpm's warm and it was hard to start cold acted like it was flooded.Ck'd fuel pres...
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2002 GMC Yukon XL 1500 SLE 5.3L No Start VIN: 1GKEK13272
Sorry about the lack of test data up to this point I don't usually post like this but this is such a strange intermitent problem that I thought I would try to throw it to you guys to see if someone else has seen this. This Yukon once it goes below a quarter ta...
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1990 Oldsmobile 98 Regency 3.8L Mechanical VIN: 1G3CX54C2L
HAS A SCRAPPING/THUMPPING NOISE. IS MOST NOTICEABLE WHEN I PUT MY STETHESCOPE ON EXHAUST MID PIPE JUST ABOVE TRANS. ALSO WHEN I PUT IT ON THE EGR PIPE RIGHT NEXT TO THE EGR IT IS REALLY NOTICEABLE. WHEN I PUT IT ON LOWER INTAKE I CAN HEAR IT A LITTLE BIT BUT N...
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2000 Oldsmobile Intrigue GL 3.5L heater core VIN: 1G3WS52H7Y
customer complaint is intermitent loss of heat from hvac sys. also relates loss of coolant although it is possible this was all before cap replacement...car was low on coolant when I got it. topped it off and let it idle for an hour. good heat out of vents, st...
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1991 Pontiac Grand Am LE 2.5L Cuts out, Stall, Misfire VIN: 1GZNE14U3M
car towed in no start -had bad crank sensor replaced crank sensor module coils wires and plugs now under excelleration the car backfires and dies if you cycle ignition off and on quickly car will take off again until move throttle down again and instantly shut...
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1993 Pontiac Grand Am SE 3.3L inj pulse eng off VIN: IG2NE14N3P
This car will fire the injectors and ignition with the key on and engine off will not start. This car has a new crank sensor, ignition module and ECM. Ihave pulled both ground bundles from the bell housing and cleaned them. I have pulled the harness between cr...
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1994 Pontiac Firebird 3.4L No Start VIN: 2G2FS22S4R
Hi all. I've got one here that has me ready to pull out what hair I have left. This vehicle was towed in. It will once in a great while start and run like crap. The injector pulse will go back and forth from 9 to 30. All sensors are with in limits. It always h... Trouble codes: 82 (3x signal error)
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2001 Pontiac Grand Am SE 2.4L wont start at times VIN: 1G2NF52T81
HI Y'ALL !! customer commented the car wont start sometimes for two or three days, then it will. I have found body codes for passkey (b2965) and antitheft detergent (b2958). There is also code B2600 that may have something to do with daytime running lights. T...
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Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Skylark Custom 3.1L Cooling Systems VIN: 1G4NV55MXS
thank you for all the replies after showing the customer how the car fails the block test I finally convinced him the car had a blown head gasket, however he declined any further work. He said he would try adding bars leaks head gasket sealer and if that doesn...
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1994 Chevrolet Lumina APV 3.8L No Start, Stall VIN: 1GNDUO6L7R
Thanks for all the help. Unfortunatly I was unable to find the problem yet. I tried your suggestions. I replaced the crank sensor, cam sensor, the pigtail to the cam sensor, the harmonic balancer and spark plugs. Fuel pressure was very good at idle or off idle...
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1996 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1246T
Thanks to all who replied, i had 4 in the first hour WOW!! It seems some of early testing on this vehicle was flawed. I did indeed have 12 volts at both crank and cam sensors, what had me going was the fact my wiring diagram said that feed wire should be batt+...
10
1997 Chevrolet K1500 5.7L abs VIN: 1GCEK14R5V
thanks everyone cleaned the rust under the sensor but it did not help so we replaced the 2 front hub it works great now sorry about the close time as it is our shop truck thank for all the help
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1998 Chevrolet Malibu 3.1L po401 VIN: 1G1ND52M8W
hey Iatns thanks for all your emails.there were 3 problems,bank1 sensor2 was bad,the mass air flow sensor wasnt reading right,and i took off the throttle body and there was a am little carbon there clean passage pasted obd2 test car has a sticker on it. thank ... Trouble codes: 401 (egr low flow).
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1998 Chevrolet K1500 Cheyenne 5.7L 1-2 shift, 2-3 shift VIN: 1GCEK19R3W
Thanks to all for taking the time to reply. Checked voltage to trans from ignition switch as was suggested - OK. Since vehicle origonally came in with everything working but reverse I got another unit from Jasper and problem solved. I guess they're not perfect...
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1999 Chevrolet Venture 3.4L no start VIN: 1GNDX03E9X
I was unable to find anything at time the car was in the shop. But a big help was Bluffs Chassis for sending me a 15 page fax with everythiing you need to know about this system. I the van acts up again on the customer he will bring it back and now I have so...
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1999 Chevrolet Blazer 4.3L transfer cas VIN: 1GNDT13W1X
Vince gave an excellent explanation on how this thing works and a quick and easy way to test it. Needless to say I am sure it is the transfer case motor assembly now but the customer does not have the $600 my dealer wants for it. Thanks to all. here is vince's...
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2001 Chevrolet Cavalier 2.2L MIL Lamp on, runs fine VIN: 1G1JC12451
Well I am confident that this problem is cured. After reading all replies it really got me thinking how this system worked. Thank you to all who replied it helped me understand the system to figure it out. The problem was the EVAP canister Vent Solenoid. It wa... Trouble codes: P0440.
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2001 Chevrolet Impala 3.4L doesn't accelerate VIN: 2G1WF52E41
Thanks to everyone found that under hard acceleration vac. showed cat. was melted. warranty part problem fixed
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