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Prev Professional Automotive Repair Technical Discussions for July 9, 2009
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Open Help Requests for GM
Help Request Answers
1986 Buick Regal T-Type 3.8L No Start VIN: 1G4GK4771G
Vehicle is a friends car. He was having stalling problems over the past few months and recently has been getting worse to the point of a no start. Vehicle is in the shop and the started was burnt out so I replaced the starter and upon initial start up after st...
1938 Cadillac lasalle 353CID no turn
customer charged battery , but it has been sitting a long time -before i make trip out to her house can anyone tell me the size of the crank shaft bolts and spark plug as i want to bring the right tools to r/r plugs and add mystry oil to cylinders and turn cra...
1993 Chevrolet K1500 Suburban Silverado 5.7L Hesitation, no power VIN: 1GNFK16K3P
This truck is getting old. When taking off from a stop, under full throttle it will accelerate to 24 mph and stay right there, it won't rev over 3200 or shift gears until you take your foot off the gas. All the gears shift, but there is no power at all, you ca...
1997 Chevrolet C2500 Suburban 7.4L brake light switch
Once a year, this truck eats a brake light switch. Brake lights stop working, cruise control doesnt cancel, and a check engine light comes on for torque converter. Every time this happends, I pull the switch apart and find the copper contacts have broke off. I...
1997 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall, Misfire, Poor Fuel Economy VIN: 1GNDT13W3V
This truck has had a very bad shake at idle since i bought it. The coil was burned through and thought that would fix it but didnt. As you can see from above it has many new parts already on it. When the truck is started, and the idle comes down it seems to id...
1999 Chevrolet Astro 4.3L No Start
distributor 180 out coil primary broken o-ring for injector harness in plenum. now have security light on 2-3 sec then off try to start light blinks three 1/2 times then off tried an ign. switch seen before on s-10 relearned fine this thing will not blink mo...
2000 Chevrolet Express 1500 5.7L no start VIN: 1GBFG15R5Y
hi all i have this chevy brick on wheels and it cranks but won't start fuel is at spec and mass airflow is working i get rpm on tech2 but but not spark showing on scanner but have spark at plug replaced cap and rotor corrioded now if i squirt carb cleaner into...
2000 Chevrolet Impala 3.4L power steering VIN: 2G1WF55E7Y
customer complained about hard steering effort when parking car,fluid was full,steering was hard both way's at idel,flushed steering and replaced pump,steered ok,a little harder than i would have liked,but ok with customer. came back same thing in a couple wee...
2001 Chevrolet Silverado 1500 5.3L power steering VIN: 1GCEK19T11
Hello all and thanks for taking the time to read this post. This 2001 Silverado Ext. Cab 4x4 has a "hiss" type noise from power steering, but it only seems to do it when turning to left, sitting still in parking lot can rotate wheel from center to right turn w...
2001 Chevrolet Astro LS 4.3L Cuts out, Stall, MIL Lamp on VIN: 1GNDM19W51
Hello IATN tech members. I have a 2001 Chevy Astro van in my shop I just can not seem to figure out. It came in with the symptom of not being able to idle and I just can not put my finger on why. The customer informed me this happen after she filled up with ga... Trouble codes: P0405, P0404
2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J62
This chevy has a cranks but wont start at times, when problem is happening there is no fuel pressure but also the instrument cluster does not energize,all of a sudden you hear an electrical clicking type noise the cluster sweeps and it starts, no bcm or pcm co...
2004 Chevrolet Silverado 1500 4.8L Compressor VIN: 2GCEC19V74
Truck came to shop not cooling. Found Low side line freezing up. Added 4oz. r-134a all seemed to be ok 40 degree air out of vents. Customer picked up vehicle and came back complaining of hot air out of vents sometime. Test drove vehicle with scanner and found ...
1997 Oldsmobile Aurora 4.0L Cooling Systems VIN: 1G3GR62C8V
Real hair puller here,car overheating after about 15 to 20 mile,s,temp climb,s into red.If you turn the heater on temp will drop to normal condition.Will set and idle all day without overheating.will also overheat worse in town driving.replaced radiator,t-stat...
2003 Other GM W22 Chassis 8.1L Data Scrambled VIN: 5B4M967G22
Tried 2 different scan tools to read data. Both had wheel speed sensor data changing from -45 to 125 MPH on all four wheels while unit was not moving. ABS light comes on at key on and self checks off. ABS light comes back on at 25 MPH and remains on. Checked a...
2001 Saturn SL2 1.9L 3-4,4-3,3-2 shifts VIN: 1G8ZK52771
Though my shop doesn't do much w/ automatic transmissions, this custumer who is one of my oldest and best sent me his sons saturn for advise and possibly repair. I would only like to have some help that might allow me to come up with a likely course of action....

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue Ultra 3.8L unknown VIN: 1G4CU5219S
Overall responce mode doors --- problem is much more severe than that. Others say windshield plastic edge or roof brace or accumlator pop ? Never heard this term. Last was to wait listen for more time, believe it is in dash, this is most acceptable for now as ...
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on, VIN: 1G6KE54Y0X
Thank you guys who tried to help, Yes that was the best way to get to the sensor by removing the craddle bolt and lowering the sub frame, even though that was a bit tight I finally got over it. Thanks again IATN and you techs who helped me. Regards, Herman.
1999 Cadillac DeVille 4.6L HVAC cooling VIN: 1G6KD54Y3X
Hello, everyone. I found the problem. The actuators I looked were vacuum ones and according the diagram none of them for air mix door. I found electric ones on the pass side, one for pass side door, one for driver side. Both linkages were disconnected, one out...
1999 Cadillac DeVille 4.6L blower speed VIN: 1G6KD54Y7X
to all who replied, thanks for info. the fix was as i suspected, the problem was i didn't have vehicle running to check operation. tried new blower motor and checked operation with vehicle running. operation successful. thanks again to all of you. i even lea...
1999 Cadillac Eldorado ESC 4.6L hvac VIN: 1G6EL12Y6X
Well I hate to post a fix where the repair was a shot in the dark, but here goes!! Customer elected to replace control head,( his other choice the programmer)we test drove the vehicle several times and did not experience air from dash vent default to defrost ...
2007 Cadillac Escalade ESV 6.2L temp door VIN: 1GYFK668X7
I do not know for sure wether this vehicle is fixed at this time. Thanks to Steve and Jason for their replies suggesting warranty coverage or the possibility of the door's foam insulation coming loose. What we have done so far is this: The customer stated that...
1993 Chevrolet Lumina 3.1L master cylinder VIN: 2G1WL54T6P
Thanks to all that replied, Given the expense involved with the replacement of the valve body with the possibility of that not completely solving the problem the customer decided to scrap the car.
1998 Chevrolet K3500 Cheyenne 7.4L not sure VIN: 1GBJK34J3W
Sorry for the delay in getting this fix posted...long story! I followed advice from Chad from Alabama "I'm assuming this truck has drum brakes on the rear? Take it back out for a road test. Get back up to speed were you feel vib. Pull the parking brake rel...
2004 Chevrolet Express 3500 6.0L Misfire VIN: 1GBHG31U74
Thanks for everyone's input however we have exhausted all efforts outside the engine. We are currently working with Jasper Engines tech staff. They have been very helpful but the problem still exists. We are installing a new engine as we speak in hopes the iss... Trouble codes: P0300 (Misfire).
2002 Oldsmobile Aurora 4.0L unknown surge VIN: 1G3GS64C62
2001 Pontiac Firebird Formula 5.7L altenator VIN: 2G2FV22G81
I never recieved a defenitive answer on how many volts the regulator should recieve. It was the only wire on that circuit. So I put the rebuilt alt from pep boys the customer had, he did not want to pay for an a/c delco. Did a voltage drop test to the grou...
2006 Pontiac Wave 1.6L reprogramming issue VIN: KL2TD59616
Thank you Bob for your caring about my concern, I finally reprogrammed this deawoo by using another calibration software. As I mentioned into the request on these Deawoo it is not possible to overwrite these car's ecm, I know even if not recommended we can ref...
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