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Prev Professional Automotive Repair Technical Discussions for March 20, 2006
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L Battery Light VIN: 3G5DB03EX2
This is my mom's car and she is 250 miles away. Her battery light comes on only after driving over 75-100 miles. It will start to flicker a little bit and then after a few minutes it may come on steady. If she turns the car off and waits a few minutes the ligh...
1997 Cadillac DeVille 4.6L No Start, HARD START VIN: 1G6KD54Y5V
car wouldnt start cold after sitting overnight. customer said it started after dealer replaced fuel rail assembly for a recall. did some diagnostics & found spark plugs were being flooded with fuel. checked & replaced weak crankshaft sensors. still a little ha...
1983 Chevrolet K5 Blazer Custom 5.7L Harmonic Dampner VIN: 1G8EK18H9D
Ok guys we all heve seen this at least once. Someone's relative installs th engine and forgets something. In this case the timing tab. The dampner times straight up behind the water pump. The only timing tab I can get times from the side by the ps pump. The gu...
1993 Chevrolet Lumina Z34 3.4L timing belt VIN: 2G1WP14X3P
My first 3.4 belt job.I need to change a oil soaked timing belt(not broken).Can I lock the cam gears from the outside and mark belt and teeth.I,ve read archives and some have problems with belt whining from being to tight.they said you have to follow instructi...
1994 Chevrolet Camaro Z28 5.7L 3-2 solenoid VIN: 2GIFP22POR
Hello: My friend is working on this 4l60e at his shop. He keeps getting a code 84 3-2 downshift solenoid feedback fault. He has checked the two wires from ECM to solenoid. Replaced the solenoid, and even replaced the ECM but not the prom. He still gets an ins...
1996 Chevrolet Lumina 3.1L rocker arm VIN: 2G1WL52M3T
Hi have a 3.1 come in with a miss and low power. Found number 3cyl dead. Pulled rocker cover and found ex rocker pulled threads out of head with pushrod ok, in. rocker still tight but pushrod badly bent.I have pulled intake and thought I would find a broken li...
1996 Chevrolet Caprice Classic 5.7L trans shifting VIN: 1G1BL52PXT
have a jaguar conversion with a 1996 caprice engine and transmission installed, has aftermarket wiring harness for pcm and trans. problem seems to be mostly trans related, can manualy shift from 2-3 even though shifter will pull down into 1st, cannot tell any ... Trouble codes: P1652, P1664
1996 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19M9T
Hi all,this truck has a cold start problem.I'm told It usually has a long crank time first start and then fine untill cold again.It was driven to me and sat overnight ( -10 cel) start in morn.This truck has correct spark timing.Fuel pressure is very wierd,...
1997 Chevrolet K2500 5.7L Poor Idle Quality, Misfire, Low Power VIN: 1GCGK29R5V
Cylinder number 2 makes no difference when using Genesys to shut down injectors. Compression good, spark good. Any help or tests would be appreciated
1997 Chevrolet C1500 4.3L Mechanical VIN: 1GCEC14W6V
We just got this engine together and there is no wind in cylinder 5. I removed the valve cover and watched the rocker arms they are working good up and down, I then closed both valves and to a leak down test and the valves are seating, I dont have a clue on wh...
1998 Chevrolet C1500 Cheyenne 4.3L Misfire, MIL Lamp on VIN: 1GCECI4WXW
problem only occurs at cruise,never under load,idles fine.found several posts regarding worn distributor drive gear,pulled dist.,gears are fine.found several posts recommending to enlarge dist. hold-down hole to adjust.this may be something i attempt later(don... Trouble codes: P0300 (random misfire detected), P1345 (ckp sensor/cmp sensor correlation)
2000 Chevrolet C3500 5.7L Misfire VIN: 1GCGC33R5Y
Hi guys, this truck is a reoccuring nightmare. We put an engine in about 1,000 miles ago because of a no compression problem. We then had a fuel issue that turned out to be a bad VCM. ...1,000 miles later came back with an EGR code and random misfiring, We tra...
2000 Chevrolet Monte Carlo SS 3.8L torque convertor clutch VIN: 2G1WX12K9Y
Hi, Thanks to all for reading. This Monte came in due to a surge that happened when engine is warm and during light accel at around 45 mph and up the tcc will fluctuate at around 30 to 60%, and the rpm will surge 200-700 rpm. With no misfires detected, and tps...
2001 Chevrolet Impala 3.8L idle creeps up VIN: 2G1WF52K31
I'm sure there is something going on with this car that takes out the ECM. I find it hard to believe that I could have a new ecm that fails the same as the old one. Unfortunately I just don't have any idea where to look. Sensor values all looked OK with new ec...
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23103
no start cold/after sitting over night,no fuel pressure in primer/filter assembly, after priming fuel system (alot),it may start, temperature outside was below [...], has to be brought into shop for a couple hours at 70 degrees to get to start, after new f...
2004 Chevrolet S10 LS 4.3L air delivery VIN: 1GCDT13XX4
Customer stated it started blowing out the vent only. I checked vaccum at the control its fine. I know they have trouble with oil from the transfer case but thats not the case. Theres no air leaks in the lines. Has anyone seen this before? I guess i'm trying n...
2001 Oldsmobile Intrigue GL 3.5L windows/radio VIN: 1G3WS52H91
Hi Gang- we have a problem child here. The client states that when it is below 40degF the radio will intermittently not operate. When this occurs one or more windows will also not operate. When the car warms up than the windows and radio will operate fine. The...
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...
1999 Pontiac Montana 3.4L Misfire VIN: 1GMDX03EXX
there is a constant misfire on cyl 5. new coil and wire to cyl 5 has been tried. compression on all cyl 145-165 psi cyl 5 was 150 psi. the plug in # 5 is fuel fouling, there is no drop in fuel pressure when key off indicating not a leaking injector. there is a... Trouble codes: P0305
1999 Saturn SL2 1.9L MIL Lamp on, low fuel trim VIN: 1G8ZK5274X
P0172 stored; O2 and fuel trims comfirm engine is running rich. Car has no other symptoms. Engine vacuum is good at 20" idle, 22" at 2500 RPM. I feel this rules out valve timing. I've read of PCM programming that causes fuel trim errors, but I am able to er... Trouble codes: P0172 (rich running)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Eldorado ESC 4.6L air ride VIN: 1G6EL12Y3W
Fixed the caddy today, orange wire in harness going to air comp. rubbed threw on the rear sway bar and turned green. The orange wire supplies power to the exhaust sol. on the air comp. No power no work. Thanks everyone for the help.
1996 Chevrolet K1500 Cheyenne 5.0L with lights on and putting vehicle into reverse en VIN: 2GCEK19M1T
First of all, I would like to thank everyone replied to my call for help . I read all... and it wasn't the boopster valve. Believe it or not this truck some how ran for over a year with-out a ground connection between the frame back to battery.I finally added ...
1998 Chevrolet Express 1500 5.0L No Start VIN: 1GCFG15M5W
Thanks to all 10 techs who replied (Steve,James,David,Buddy,Robert,Bob-Michigan,Bob-Nebraska,P aul,Scott,& John) in that order. 3 replies answered my initial question on ground pins. Others included flow testing injectors(tested good) presence of crank rpm (ok...
1998 Chevrolet Venture 3.4L Cuts out VIN: 1GNDXO3E9W
Good evening Techs, Thanks to all who responded or gave it some thought. Kevin said to check the 7x wiring harness for heat damage from the exhaust. My Tech did and there it was. The insulation was melted in the same spot on both wires. I scoped the 7x several...
1999 Chevrolet Silverado 1500 4.8L lubrication system VIN: 1GCEC14V1X
Hi, well Bernard gave me some good advice about the moisture build-up with short trip driving and I guess I just never thought you could have that much moisture in the engine to cause a milky color and a lose of oil pressure. What I did was ran the truck for a...
2002 Chevrolet Trailblazer LS 4.2L starter VIN: 1GNDT13S62
The vehicle has never come back for further diag. and or the problem hasn't happened again. The truck left here running and not blowing fuse anymore.. Left this open this long to see if truck came back, but hasn't. Thanks for all replies.
2002 Chevrolet Silverado 2500 HD 8.1L Crank Sensor VIN: 1GCHK23G02
I had to remoce engine, drop crank down and push out the bottom 2 inches that would not come out. Then reinstall 18 hard hrs later. Thanks for the replies!
2003 Chevrolet Trailblazer North Face 4.2L body vibration VIN: 1GNET16S63
aran and ernie hit it right on the head, found stones lodged in trans mount causing grounding vibration. i would have never believed it without seeing it myself. if anyone out there runs into a heavy vibration , check there first, i completely removed the moun...
2005 Chevrolet Silverado 1500 LS 5.3L soft plug VIN: 2GCEK13T25
Cust. got the truck back today. Dealer said that the soft, freeze, expansion, frost,plug was installed incorectly. But do to the fact it has been replaced twice they will warranty it past the 36000 mile warranty. Thanks to Sherman, Marshall, Stephen, and Micha...
1993 GMC Safari SLE 4.3L Unknown VIN: 1GKEL19W2P
well thanks for all your sugestions what fixed it was 1.. changed the t/c fluid from dex to the syncro mesh found in the electronic type t/c the new style with the 4 button 4x4 that helped greatly but still some viberation took to mechine shop tot ballance the...
1999 GMC Jimmy SL 4.3L rear rotors VIN: 1GKDT13W7X
Thank you for the replies due to your info I was able to pinpoint the vibration. I found the Right Front rotor out of tolerance. The parallelism was .oo15, on the front. This Vehicle vibration was most definitely coming from the rear, when you step on the brak...
2000 GMC Sierra 1500 SL 4.8L eratic VIN: 1GTEC14V7Y
everyone seams to agree that its the sender unit in tank customer wants to wait awile before fixing thans for all the help 17 replies
2002 GMC Jimmy SLS 4.3L Bleeding VIN: 1GKDT13W22
hello thank you to everyone who responded to this one. i cand not find any diagnostics info in the brake pressure modualtor. I went on my huntch that it was faulty.. i had fluid from the master cylinder to the modualtor and then coming out on the rear. and Lef...
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