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Prev Professional Automotive Repair Technical Discussions for February 22, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick Park Avenue 3.8L auto heat control VIN: 1G4CW52K4T
car came in battery going dead was unable to duplicate then after several days starter car after turning key off and out noticed clock light still on.pushed the auto temp button on heater and light came on dimly and heater blower motor will come on and operate...
1998 Buick Skylark Custom 3.1L passlock VIN: 1G4NJ52M3W
Vehicle was towed in from another shop with Theft system problem. Pull codes p1629,run diagnosis only to be referred to Antitheft and Alarm Systems. Only have Mastertech available, so checked under Body control and get wrong selection or ecu not present messag...
2003 Buick Rendezvous CXL 3.4L 4 wheel drive VIN: 3G5BDO3EO3
Hi everyone, This is my first time to work on a Rendezvous, the 4 wheel drive will not engage, when the front wheels start slipping in the snow the all wheel drive disable light comes on. I checked for codes and there are none. I checked the wheel speed sensor...
1999 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y3X
Cadillac Men, got a Caddy with P0202(injector ckt problem).Vehicle runs fine,no complaint from customer.Seems to be intermittent.No Tsb's,no hits on iATN and following the code tree chart leads nowhere(see tests and results).Current ramping shows no clues. I c... Trouble codes: P0202 (Injector ckt 2 this code set the MIL lamp), P0203 (injector ckt 3), P0205 (injector ckt 5), P0208 (Injector ckt 8)
2000 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS54Y4Y
this cad came from dealer. they had installed bank 2 coils, and crank sensors, recommended convertor. customer brought car to me for convertor, used oem convertor and bosch o2 sensors. car returned 1 month and 179 miles later with code P1134. retest and replac... Trouble codes: P1134
1982 Chevrolet Corvette 5.7L No Start VIN: 1G1AY0783C
Hey all, 1982 Vette had new fuel pump installed by non-local dealer about 100 miles ago( if you seen low miles, car is a trailer QUEEN). Brought to us with no start, diagnosis bad pump, we installed new AC/DELCO with new sock & inline filter. Inspected wiring ...
1989 Chevrolet Corvette 5.7L Poor Idle Quality, MIL Lamp on VIN: 1G1YY2183K
89 Corvette Installed new engine. customer returned set code 42 EST. Checked Mitchel On Demand and followed flow chart. Ingition Module was not switching. Replaced Ingition Module - switiching now. Still have code setting. Per flow chart replaced ECM. Not prom... Trouble codes: 42 (Electronic spart timing)
1990 Chevrolet Cavalier 3.1L rad fan will not com VIN: 1G1JF11T8L
Hi We are having a time to get the rad fan to come on.If you ground aldl it will work.The relay is not seeing a ground from the ecm.voltage drops at the grounds are ok.the temp switch has ground at b5 and 5 volts at e16.wire is good to ecm.For some reason the ...
1998 Chevrolet C3500 Cheyenne 7.4L Collapsed fuel tank VIN: 1GBKC34JXW
This is a one ton dump truck that receives much abuse. Two months ago the truck came in with multiple problems; plugged exhaust, clogged injectors, bad O2 sensors, along with a collapsed side fuel tank. The sides of the tank crushed the pump module and I could...
1999 Chevrolet Malibu 3.1L Poor Idle Quality, Stall VIN: 1G1ND52M4X
This 99 malibu has recently had the intake manifold gasket's done, 4-5 weeks ago. The complaint is immediatley after she fills up with fuel, on restart the vehicle will have a surging idle, and stall. upon restart it will run fine untill another refill is need...
1999 Chevrolet Silverado 1500 4.3L Surge, Misfire, MIL Lamp on VIN: 1GCEC14W2X
This is the third Chev pu that we have seen with cam / crank syncronization problem. Distributor is not adjustable, nor has it been removed. Timing chain does not have excessive play, yet scan tool shows 12 degrees out on cam shaft retard. The first rig had th... Trouble codes: P0300
2000 Chevrolet Impala 3.8L tcc VIN: 2G1WF55K1Y
i have code p0741 tcc stuck off thiss vehicle had nasty fluid in it when i started looking at it flushed and rt veh code came back on rt tried to follow diag. procedure but scan tool doesnt have capabilities to control tcc pwm i also noticed under trans info o...
2004 Chevrolet Silverado 2500 HD 6.0L Cuts out, MIL Lamp on VIN: 1GCHK23U44
This vehicle has been a thorn in our side since day one, I got thrown in the mix now, the customer can go 2 to 3 days before codes return and reduced power light comes on, I have performed wiggle test of all wiring harness and cant fail anything. The customer ... Trouble codes: P0220, P1516, P2101, P2135, B2961
2004 Chevrolet Express 3500 LS 6.0L Power Steering VIN: 1GAHG39UX4
Customer states that when its really cold (-15F) the vehichle is very hard to steer. This vehichle has hydro boost brakes. The temp is up around 30-40F and we tried it and of course its not acting up now. Looking for any input or maybe somone has run across th...
2005 Chevrolet Express 3500 6.0L camber bolts VIN: 1GCHG39U65
The forward upper control arm bolt head is enclosed in the coil spring mount. How in the world do you access it to adjust camber/caster? Is there a special tool?
1994 Geo Prizm 1.6L Poor Idle Quality, Hesitation, Stall VIN: 1Y1SK5368R
this car came in as a no start found bad wires, tunned up and it started.still did not run good,had a code for the map, replaced sensor this problem is corrected,also found a bad o2 and replaced it, now it reads great. the real problem is when it gets hot the ...
2003 GMC Envoy XL SLE 4.2L noise VIN: 1GKET16S73
this vehicle has a tapping noise behind the radio area sounds like either stripped blend door or a bad acuator I dismantled 80% of the dash but cant see anything didnt want to go farther without some help dealer stated fuel peddle sensor caused this noise but ...
1995 Pontiac Sunfire GT 2.3L Engine VIN: 1G2JD12D7S
We have a 1995 sunfire here it has the 2.3 quad motor. We are looking for a used engine, and the yards we deal with are telling us 95 only... Is it possible to use 1990-1994 engine in this unit? I have checked other cars and it appears to be the same block and...
1998 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB5243W
car had wrong plug # in replaced with new and I can only get it to run under full throtal and it seems like it runs on 2 cylenders. custemer was driving and all the suden it staled and could not get car to restart. steve [...] Trouble codes: P0118, P0335, P0530, P1629, P0707
1999 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WR521XX
Thanks in advance for any help. I have been working on this car for a used car lot on and off now for a month. It is a Pontiac Grand Prix GTP. The problem is that the #3,#6 coil pack does not spark. I have moved coil packs and problem stays in same spot on Ign... Trouble codes: 300 (random miss)
2002 Pontiac Sunfire SE 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G2JB12472
In August 2006 customer came to us complaining of RPMs surging to 4K when the engine is hot. Check engine lite had been coming on, but not on when the car dropped off. Had codes PO105, MAP sensor or TP sensor out of range; PO171, System lean bank 1; PO507 idle...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Reatta 3.8L Instrument panel VIN: 1G4EC11CXK
Each of the respondents to my help request suggested that the digital dash module that had been recieved was defective and needed to be rebuilt. Most suggested a place to send the module where it could be rebuilt for a nominal cost. None of the replies answe...
1997 Cadillac Catera 3.0L no heat VIN: WOGVR52R6V
I received 6 replies, 5 of them said that in was probaly the actuators, one said to remove one on drivers side & move the blend air door manually to see if there was heat & there was. So we ordered to actuators & installed them, the as allen said we had to syn...
1994 Chevrolet C1500 Cheyenne 6.5L Surge, over rev VIN: 2GCEC19P9R
The customer contacted the person that he recently bought the vehicle from and they picked the vehicle up yesterday and towed it 400km to be worked on. I asked the customer if he could call me once it it fixed so that I can update this post properly but I will...
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2GCEK19T1X
most everyone was right on on this one-added propane at base of intake and voila!trim numbers took a dive!installed updated intake gaskets and problem solved.should have known when dealer had 12 sets in stock.intake was leaking at both center ports on each sid... Trouble codes: 171 (lean condition), 174 (lean condition).
2000 Chevrolet Venture 3.4L Oil consumption VIN: 1GNDX03E7Y
Great News! This Venture is well again! Thanks to all of you who took time to help and a special thank you to those who called and gave a lot of help. I waited for a few weeks to post this fix so we could see if the van was going to do fine. What we did to fix...
2000 Chevrolet Silverado 1500 4.3L oil filter VIN: 1GCEK14W4Y
thanks everyone for all the replies,what i found out was the oil filter would blow out the gasket due to high pressure when temp was very cold,when outside temp was around 20 degree the oil pressure was ok,no trace of coolant in oil but when changing filters n...
2001 Chevrolet Silverado 1500 4.3L Excessive Emissions, No Start VIN: 1GCEC14W91
thanks to everyone who replied. the filter in the dist. was plugged with the green. i removed the screen and cleaned base. even though this only happens after a years time, im calling this one fixed
2001 Chevrolet Silverado 2500 HD 8.1L Mechanical VIN: 1GCEHK29G8
Basics, basics, basics. Even though there was no piston washing or scoring in any cylinder, the three worst had broken rings. We were sure the PCV or intake couldn't pull that much oil but were looking for that 'Silver Bullet' so as to not have to disassemble ...
2001 Chevrolet Silverado 2500 6.0L No Start, Starts and Dies VIN: 1GCHK29U71
We still don't know for sure what caused all the damage to the modules, I assume the jump starting spiked the system, but the truck is now fixed! The Transfer Case module, Instrument panel Cluster, Body Control module, and Radio were all replaced. The Transf...
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J22
thanks for the help putting my head back on my shoulders. it was the ignition switch. thanks again
2003 Oldsmobile Silhouette Premiere 3.4L coolant fans VIN: 1GHDX03E53
We finally determined that the computer was the problem. We tried the coolant temp sensor as it was showing correct #'s but we wanted to make sure after receiving the e-mail about the problems that one of the techs found. After replacing the sensor we still ha...
1996 Saturn SL2 1.9L No Start VIN: 1G8ZJ5279T
Hello, This car is fixed. The whole problem was somebody worked on this that did not know his head from his #$$!!!. I ended up replacing both fuel lines from the tank to the engine. They all were for a 98 instead of a 96. It did end up having a return line but...
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