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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 27, 2009
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Open Help Requests for GM
Help Request Answers
1992 Buick Regal Gran Sport 3.8L Cuts out, Stall VIN: 2G4WF54LXN
Hello all! Regular customer brought his car in complaining of stall. Restarts right away. On test drive with no pattern car will buck. Speedometer and tach drop to bottom then go to top simultaneously. Then guages will resume normal operation. Engine will surg... Trouble codes: 41 (CAM SENSOR I dont think its related.)
1995 Buick Century Special 3.1L very low power VIN: 1G4AG55M7S
Buick came in for a severe coolant leak. It turned out to be the intake gasket. So I performed a routine intake job. After I finished the job, the vehicle starts a little hard and acts as if I crossed a couple wires. Since this time, I've torn down top again, ...
1996 Buick Skylark Custom 3.1L Cuts out VIN: 1GM4J52M2L
hi iatn techs,gat one for the buick tech.this car have a problem with the passlock system.found out that the pass system fails some times.when it works,all the ligths on the dash turns on.when it fails,no dash ligth turn on.the engine would crank start and tur...
1982 Cadillac Eldorado 4.1L Cuts out, Stall VIN: 1G6AL5784C
This car has made its rounds around town. When cold it starts and idles fine when it warms up the second you put it in gear it dies and will restart first click of the key. Everyone has change everything at least once on this car. I origanly thought it was the...
1993 Cadillac Fleetwood 5.7L No Start VIN: 1G6DW5277P
vehicle came into shop on hook, cranks but no startup. has 13 psi fuel pressure. no spark at the coil. no injector pulse at either injectors! we replaced ign module and distributor. the vehicle still does not have spark/pulse. still no start. any help would be...
2004 Cadillac DeVille 4.6L washer pump
I have this car that is driving me crazy. The customer is complaining about the washer pump not working, but wipers work when you hit washer button. I have witnessed this not working when she first came in. Since then everytime she comes in (twice)it is workin...
2002 Checker 1500 Silvera 5.3L Misfire VIN: 2GCEK19T32
Pickup came in with p0300 code (multiple misfire). It misses less at idle but on a road test watching scan tool misfiring. The cylinder on bank 2 are missing. cyl. 4 and 6 miss terrible and 2 and 8 not as bad. This engine was replaced by a GM dealer 20,000 mil... Trouble codes: P0300
1986 Chevrolet K30 Custom 7.4L master cyl linkage VIN: 1GDJK34W3G
hello all hope somebody has some insight to this problem.as stated in history ring gear was replaced .same clutch, release brg , fork, pivot , master cyl & slave cyl reused.tranny went in easy not forced in at all.customer picked truck up day after job complet...
1994 Chevrolet Camaro Z28 5.7L Code 81 2-3 solenoid circuit VIN: 2GIFP22P9R
Vehicle came in with code 81, 2-3 shift solenoid circuit. I checked all the wiring, internal trans wiring was rough so I replaced it and both shift solenoids. Code came back. I found that the PCM wasn't sending a signal to the 2-3 solenoid. Replaced the PCM. I...
1996 Chevrolet P30 Fwd Cont 7.4L Mechanical VIN: 1GBLP37JXV
This RV Belongs to me. I noticed last year that intermittently i would lose power and then it would come back as quick as it left. There were no noises. The power loss didn't last long, maybe 30 seconds to a minute. I also noticed that the A/C Ducts closed at ...
1998 Chevrolet Venture 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDX03E7W
This van came in running ruff with po300 after checking codes we found some misfires on different cylinders but #1 was missing all the time I check for spark and it was ok lissen to injector it seam to be working.Ok here is what I have done. I resealed the int... Trouble codes: P0300
2002 Chevrolet Cavalier LS Sport 2.2L shift VIN: 1G1JH12F82
This Cavalier drove into the shop (with violent ex-boyfriend in tow) with a complaint of poor shifting and a check engine light. Went through the Mitchell diagnostic and found no faults in the circuits. Checked continuity from the 20 pin connection at the tran...
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality VIN: 1GNDT13S82
Vehicle came into center with the following codes with in the system: P1345- cam crank correlation error. This code sets at idle. Idle is moderately poor with the A/C compressor active. with out the compressor on it purrs nicely. I removed the cam actuator a... Trouble codes: P1345 (CMP/ CNK correlation)
2004 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Misfire, Flooding VIN: 1G1JC52F54
Customer complaint of miss @ idle. Verified after start up when engine idles down it will act like it is loading up on fuel, O2 sensor remains in high 800 - 900 mlvolts, fuel trim LT -14 to-18 ST -10 to -18. Vacuum starts @ 15hg drops to 9-10hg when engine is ... Trouble codes: P0300, P0171
2006 Chevrolet HHR LS 2.2L starter
first hhr I've ever touched. it took fifteen minutes to find the battery. customer complaint is intermitent no crank and itermitent guages inop while driving,but car still drives. any ideas would help. thanks, steve
1998 GMC K1500 Sierra SL 5.7L brake pedal VIN: 2GTEK19R6W
Had vehicle come in with low brake pedal. Customer said he had to add brake fluid once. We checked brake fluid and level was good. Looked for external leaks found none. Checked out brakes, found pads and shoes to be wore out. Replaced rear shoes, spring kit, t...
2003 GMC C4500 Topkick C4C042 6.6L no accelerator funct VIN: 1GDE4E1123
when you start the vehicle it is able to go down the road then intermittantly while accelerating it returns to idle, it can only be driven after it has been shut down for a minute or more, and then sometimes it will only move 500ft or it will run for the rest ...
1991 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, Hesitation, Cuts out VIN: 1G3WH54T9M
I've got an old one that just doesn't want to run right. The car is 18 years old but still looks good. Customer came in with run issue and stated that a relative did some tune up work awhile ago. I scoped engine and #3 & #5 were showing high kv patterns. Found...
2001 Oldsmobile Alero GL 2.4L engine noise VIN: 1G3NL12T81
have a good one it make noises on the right rear near the manifold at high idle or running around 2800-3000 comes and goes, put scope on timing cover not loud there check exhaust and shield none found loose ,remove belt the noise became little louder , also fe...
2003 Saturn L200 2.2L No Start VIN: 1G8JU54F43
See above short tests. Engine will start with short burst of starter fluid. IGN ok. I went to the BCM mode of my scan tooled and selected "security". "Key learn mode" is enabled. "Key Learned" says, "no". I think that the car hasn't recognized the key & has di...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac DeVille 4.6L Torque conveter lockup system VIN: 1G6KD54Y8X
Thank you all for your help in this mater. I will be running this new imformation past my customer and we will see if he bites. I am glad i posted for i would not have know about the optional converter design (mechanical vs visous clutch) and sense a transmiss...
1998 Chevrolet C1500 Suburban LS 5.7L Radiator VIN: 1GNEC16R8W
I`m going to close as a fix but time will tell. Replaced radiator with different brand, checked for voltage in coolant checked ok. Installed ground strap for insurance. Checked for headgasket leak it checked ok. All now we can do is wait and see. Thanks for th...
1998 Chevrolet Astro 4.3L Misfire VIN: 1GCDM19W7W
Well after banging our heads for awhile we figured it out. We started tracing all the wires from the injectors and under the battery and tray we found a rusted loom bracket that was rubbed threw the wire harness. Fixed the broken wire and we were back in buisn... Trouble codes: P0300.
1999 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W1X
Thanks everyone for all of the help. This was a used engine that was installed. Don't know if that was the problem but the VCM was goofy. Car ran great for 30 miles then started acting up. Misfiring. Nothing helped. Then the fuel and temp gauge quit which I ... Trouble codes: P0300 (Random misfire).
1999 Chevrolet K1500 Suburban 5.7L Parasitic drain on battery VIN: 3GNFK16R5X
This one is fixed. All it took was another new NSA unit. I was lucky enough to have a NSA warehouse 10 miles away. And the person working there was very helpful.I took the unit there hoping to compare it to other units of the same part number. My unit had meas...
2002 Chevrolet Monte Carlo LS 3.4L ipc VIN: 2G1WW12E52
customer declined any further repairs at this time, as we did head gaskets ,and blower resistor.the iginition switch was cked with no problems found. i can tell you that by taking the sdm/airbag module off the class2 line the cluster worked perfect,also couldn...
2003 Chevrolet Tahoe LT 5.3L control module VIN: 1GNEK13Z83
Thanks to all that replied. This Tahoe is finally fixed.I checked all wiring etc. as suggested and found all to be good. Sent to dealer to be programed and all was well for 5 days and service 4 W.D. light came back on.This time it took an encoder sensor to fix...
2004 Chevrolet Silverado 2500 HD 6.6L Fuel Gauge VIN: 1GLHK23184
Vehicle had the wrong sending unit. Resistance values where exact opposite. Replaced sender with correct unit. Fuel guage works correctly.
2004 Chevrolet Blazer LS 4.3L Excessive Emissions, MIL Lamp on VIN: X24K113591
I've checked to see how much amp draw on both and 80mA on both.I didn't load up the wires though.I 've ck the signal hi and lo and both seems to working according to rich and lean condition that i created.But B2 will tend to stay on the lean side a little long... Trouble codes: P0135, P1153.
2005 Chevrolet Trailblazer LS 4.2L right axle VIN: 1GNDT13S25
Well then, it's fixed. The axle shift lock assembly, also known as the bearing plate was replaced. This little case bolts to the right side of the engine oil pan and is machined to just fit the bore in the pan for proper alignment. I'm glad I choose to estimat...
2005 Chevrolet Trailblazer EXT LS 4.2L Stall VIN: 1GNDS13S45
After pulling the tank and inspecting inside I found the fuel pump module broken as a result of a sudden impact in the rear. Module was laying down toward the rear and whenever the truck was stopping fuel sloshed to the front, the pump gulped air and the vehic...
2003 GMC Sierra 2500 HD SLE 6.6L Starter & PCM VIN: 1GTHK23183
Well it's fixed. Michael and Jonathon were both suspicious of the ignition switch, Andrew gave me information on where to get a better GM wiring diagram, and Matt suggested a harness or connection that may have been wiggled or moved that would temporarily cure...
2004 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKFK66404
the charcoal canister is what fixed this truck. It was full of dirt, wich was restricting the flow. Trouble codes: P0446.
1998 Oldsmobile Aurora 4.0L Cuts out, Misfire VIN: 1G3GR62C2W
Well I got the car back in again and did some more tests. I did the compression test that Charles & Rimvydas suggested and they tested good. I then rechecked the plugs & wires that Michael & Paul suggested and they hit it on the nose. After close exam under a ...
2001 Oldsmobile Alero GL 2.4L Poor Idle Quality VIN: 1G3N52T41C
Sorry i did not get back sooner. what I found out that the throttle percent was always 2.3% at idle. It did go up when throttle was increase. I did disconnect the battery and touch them together, but the throttle percent was 2.3% at idle. when I unpluged the ...
1997 Pontiac Grand Prix SE 3.1L Poor Fuel Economy VIN: 1G2WJ52M4V
Thanks for responding - fuel pressure regulator not leaking - put clear hose and tested running, performed smoke test - slight leak to inside of engine. Replaced intake manifold gasket with major tune up - customer still complaining of loss of fuel economy. ...
1999 Saturn SL2 1.9L Starting VIN: 1G8ZJ5277X
Thank you too all that offered help. I finally found that the problem was related to pin fit, as it got to 25 to 30 below zero there was enough clearence created to prevent the crank sensor from sendng a signal to the pcm. Made some further adjustments to the...
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