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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 9, 2009
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Open Help Requests for GM
Help Request Answers
2004 Buick Rendezvous Ultra 3.6L tepm control VIN: 3G5DB03754
This vehicle has a very intermitant temp. control problem on either side but not the other or both sides. It finally acted up for us today, with the temp set to 80 there was cold air coming from the drivers side and warm from the pass. side with the pass. adju...
2001 Cadillac Seville SLS 4.6L Poor Idle Quality VIN: 1G6KF57941
thanks in advance for any help. i have a 2001 seville with 4.6l engine that has an intermittant high idle problem. problem began with customer bringing car in for a poor driveability problem with two crank sensor codes stored in ecm memory. testing was complet... Trouble codes: P0506 (idle circuit low), P0507 (idle circuit high)
1985 Chevrolet K20 Custom 5.7L engine block VIN: 1GCGK24M4F
We have this pickup that came in with a right blown hesd gasket. We removed the heads and found 3 of the cylinder head alignment pins broke, both front and rear on the right head and the front pin on the left head. All of these are below the surface of the blo...
1995 Chevrolet Impala SS 5.7L crank hub VIN: 1G1BL52P3S
we replaced the front timing cover gasket and seals for oil leaks now the problem we have is that after completing the repair and reinstalling all components and accessories it seems like the front hub went in to far because the harmonic balancer /crank pulley...
1999 Chevrolet Blazer LS 4.3L Rear Window Defrost VIN: 1GNDT13W0X
We have this Chevrolet Blazer that the customer says does not defrost on the back window when rear defrost button is pushed. We tested the grid and there is power through the entire grid. The customer also told me that the heated mirriors do not work. I do not...
2000 Chevrolet Express 3500 6.5L No Start, Interm. Long Crank VIN: 1GCHG35F8Y
I was driving on the highway at 60 mph and suddenly this van quit as if the ignition key was shut off. The wait to start lamp did not come on nor did the lift pump run. Lift pump did not run while cranking either. All other dash lights lit up when the key wa... Trouble codes: P0380 (Glow Plugs intermittently)
2000 Chevrolet Silverado 2500 LT 6.0L Flexplate VIN: 1GTEC29UOX
Customer came in with a noise in trans area at idle. Confirm noise as flex plate. Order a replacment from dealer according to the VIN number. After installing new flexplate, which looked different, with a reinforced area on the crankshaft mounting flange and n...
2001 Chevrolet Silverado 2500 HD 8.1L No Start, Stall VIN: 1GCHK29G21
Hello everyone I have this Chevy in here with a problem. The truck keeps stalling when warm. found several codes at first and found a bad alternator that was bleeding amps to the ckp circuit. replaced alt and crank sensor and all was well now 3 weeks later it ... Trouble codes: P0335, U1041
2004 Chevrolet Tahoe LS 5.3L No Start, Cuts out, Stall VIN: 1GNEK13Z34
Thanks in advance for your help. Vehicle came in originally as a no start. Car would start for a second then die out. Message on dash says Unknown Driver no theft light is on or flashing.Tech 2 will not communicate with ecm or bcm. After inital inspection truc...
2003 GMC Yukon Denali 6.0L Hesitation, loosespower VIN: 1GKEK634X3
Looking for advice.suv has no codes, prob usually will happen everytime you drive. The SUV will flag traction activation on dry pavement this is customers complaint. have had happen to me several times. monitor with tech 2 nothing obvious wrong not real sure w...
1999 Oldsmobile Intrigue GL 3.5L Misfire, MIL Lamp on
This car originally came to us for an New york state inspection. the customer was upset when they found out it had failed the emissions portion due to an "illuminated" mil. WRONG, the MIL is inop. KoEo shows no activity. Cannot command it with a scanner either... Trouble codes: P0300, P0303, P0650, P0335

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Century Limited 3.3L Hesitation VIN: 1G4AG55N5P
Thanks to all who replied. Many of you mentioned a clogged cat. Looking back at my post I neglected to mention I had checked for exhaust restrictions.. However.. Several of you suggested I unplug the mass air flow sensor.. Bingo!! Cleaned and replaced and she'...
1995 Buick LeSabre Custom 3.8L engine VIN: 1G4HP52L9S
Hi I thank all who responded. I recieved many pros and cons on this and found that the crank bearings harmonic and flywheel are different . I think I am going to try and find a 95 motor because I do not have the time to do this job twice in the event somthin...
1996 Buick Roadmaster Collector's Edition 5.7L Misfire, MIL Lamp on VIN: 1G4BT52P2T
1987 Chevrolet Corvette 5.7L Poor Idle Quality, Cuts out VIN: 1G1YY3185H
I appreciate all that replied to my corvette problem,there was alot of suggestions to check the injectors(they all checked good by ohming and flow testing), the distributor checked good also. I pulled sparkplugs to see if I could determine which cylinder might...
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC52442
All 4 Spark Plugs were fouled!!! My first case I have seen where the car was this bad! The customer tried to start it and it just kept cranking - like a sensor/computer/ign.mod/theft problem. But somehow just ended up needing new spark plugs! WOW. I had alrea... Trouble codes: P0132 (O2 Signal High Bank 1 Sensor 1), P0171 (Fuel System Too Lean Bank 1), P0303 (Cyl 3 Misfire), P0621 (Gen Lamp L Control Ckt Problem), P0130 (O2 Sensor Fault - bank 1 sensor 1).
2004 Chevrolet Silverado 2500 HD 6.0L Hesitation, Misfire, MIL Lamp on VIN: 1GCHK29U54
doing a crank relearn fixed the problem, still don't know why, but only showed misfired on cylinders 5 and 8, but wasn't actually misfiring. Trouble codes: P0300.
2005 GMC Sierra 1500 4.3L cannot refuel VIN: 1GTEC14X05
thanks for all suggestions,most pointing to faulty vent solenoids.i disconnected the vent canister and solenoid at the tank,eliminating both from the equation.my intent was to go back to the same gas pump i had used to verify the customer complaint.if it took ...
2000 Saturn SL2 1.9L Readiness Monitors VIN: 1G8ZK5272Y
Most of you suggested checking the coolant temp sensor - it appeared to be physically OK - no cracks or leakage; but I changed it anyway. Cleared codes and started through drivability cycle. Readiness monitors completed OK!! Thanks everyone! Trouble codes: P0341, P0404, P1599, P1620.
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