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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 12, 2009
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
2005 Buick Century Limited 3.1L heater VIN: 1GBHC24U45
hi friends,i have this car,my problem,is i have heater only in the right side,but the other side came air cold,i ajust the heater control,from hot to cold,same problem.change thermosthat,bleed the system.nothing help.may be something in the left side not open ...
2005 Buick Rendezvous CX 3.4L 2-3 shift VIN: 3G5DA03E55
This is a new costumer for us but he says he had the trans flushed at a quick lube shop. Had to take it back because it leaked and they tightened a line to make it stop. Now he's noticed it occasionally shifts slow or delayed from 2-3 gear. For some reason we ...
1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y3X
car came in running. the message display read anti thieft problem car may not start. there is no communication with any moduals. i checked the class 2 data line and there is 8 volts all the time. i replaced the pcm, now the car will not start and all symtoms a...
1994 Chevrolet C1500 Silverado 5.7L Stall VIN: 2GCEC19K8R
hello iatn universe this 94 chev pk came in for intermittent stall at stop signs. truck fires right back up and off idle runs great.no codes stored. could not find the problem exactly other than distributor bushing was making noise and truck was in poor tune, ...
1996 Chevrolet Blazer 4.3L converter VIN: 1GNDT13W5T
vehicle has torque converter lock up at all times,scanned vehicle has p0742 tcc clutch circuit stuck on.checked wiring and solenoid for foreign material. checked harness connector for main 12pin connector no trouble found.rechecked scan data have at idle in ne...
2000 Chevrolet K2500 5.7L pedal fading VIN: 1GBGK24R9X
The previous repairs were done by another shop.I thought I would pick the brains of THE GREAT iatn members before going further. I have test drove the vehicle and it seems normal to me with no brake lights coming on but the pedal does seem to fade too far if y...
2000 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDX03E7Y
came in for mil light at idle and normal cruise the sensors work fine when you go into wide open throtle or heavy accell the voltage of both sensores drops to 50-60mv i did find that fuel pressure is about 10 psi higher than spec would this cause that and any ... Trouble codes: P0131, P0137
2001 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12481
car came in code p0440 tech checked wires at rear axle then replaced evap vent valve and purge valve, car came back tech replaced gas cap, car came back i told him to check tank for leak at sender he failed to find one replaced tank pressure sensor, car came b... Trouble codes: P0440 (evap emissions system)
2001 Chevrolet Silverado 3500 6.6L white smoke VIN: 1GCJC39151
Hey diesel guys I am a rookie and trying to figure out how to check these injectors. We just got this duramax today and it is smoking like crazy. I am pretty sure it is a injector but I dont know how to read the base rate on the injectors though my modis. it t...
2005 Chevrolet Suburban 1500 LS 5.3L Starter VIN: 1GNFK16Z65
Greetings IATN wizards. I've got a ghost in the machine here and it goes like this. Customer called up and said that for about a month that each and every time you get into the vehicle and turn the key JUST to the "Run" position [never getting the key to the C...
1997 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C0V
Came in as a no start found plugs flooded replaced ran for about 2 minutes then wouldn't restart. Determined we had a foriegn fluid in the fuel. removed all the fuel via the fuel pump. Put fresh fuel in still no start. Seems to keep flooding plugs for some rea...
1977 Pontiac Bonneville Brougham 4.9L water pump VIN: 2Q69Y7P397
vehicle was overheating. customer replaced waterpump himself. radiator was leaking as was the overflow bottle. would not idle. we rebuilt carb, did headjob. replaced radiator and coolant resevoir. still overheating. we didnt mess with water pump since it was n...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Custom 3.1L abs VIN: 2G4WS52J82
You guys are outstanding. It seems logical that the wire harness will deteriate with age and wear from the wheels being steered after so many miles. We did not see any unusual wear or resistance when inspecting the harness but these things awlays work in a sta...
1997 Chevrolet S10 2.2L Poor Idle Quality, Misfire VIN: 1GCCS1442V
found egr gasket on back of cyl head was wrong, install correct egr base plate gasket, problem solved. Thanks to all who took time to replay. Trouble codes: P0300.
1998 Chevrolet Astro 4.3L speedometer VIN: 1GNDM19W8W
Thanks for the help everyonethat replied. The signal from PCM to the istrument cluster is suppose to be a 5 volt signal. While testing, the speedo started to work intermitantly and when it worked the signal jumped from .5 volts up to 5 volts. After some fut...
1999 Chevrolet Monte Carlo LS 3.1L #2 cylinder miss VIN: 2G1WW12M4X
Well, I got a lot of push rods switched, valves tuliped and cam lobes slipped. I wish people would read the posts and not just post to be posting. I did say it had an intake leak so I could have switched the push rods but I did tell you it had the [...] and t...
2000 Chevrolet Silverado 2500 LT 6.0L Flexplate VIN: 1GTEC29UOX
Thank you for so many replies however I had checked them all. Apparently I had one of the very very early production (3-99)6.0's which does not use the flexplate mounted flange according to to the GM parts tech help in Michigan. I followed their advice and r...
2001 Chevrolet Silverado 2500 HD 8.1L No Start, Stall VIN: 1GCHK29G21
OK Everyone the Truck is hopefully repaired. I found that the crank sensor was not replaced my tech replaced the cmp sensor on the front of the engine. Thought he got the job done a little quick last month. OK back to the truck. I replaced the crank sensor on... Trouble codes: P0335, U1041.
2001 Chevrolet S10 4.3L front differential pinion seal VIN: 1GCDT19W81
Customer has returned to have me check this leak again. There seems to be no play in the pinion bearings, u joint, or anywhere else. The vent tube seems clear as I removed the fill plug and blew air through the vent hose and could hear it echo in the diff ho...
2004 GMC Sierra 1500 5.3L Hesitation VIN: 1GTEK19T84
So we finally have this vehicle fixed. Thank you to all who responded. The issue turned out to be a transmission problem. We had no torque multiplication in first gear. We removed the transmission again and performed an inspection on the stator support and fou...
2006 Pontiac G6 2.4L Hesitation, Low Power VIN: 1G2ZF55B66
Thanks for the replies. Mark nothing changed at an idle when the cam solonoids were unplugged. Robert no codes, fuel trim OK, ran worse with MAF unplugged. Kevin compression was good. I checked valve timing, was right on. One thing that was odd was for how poo...
2009 Saturn Outlook XE 3.6L Poor Fuel Economy VIN: 5GZER13D49
Thanks to all for the input. Replys included motorvac service, questions and comments on mileage calculations, driving habits, the fact that if fuel trim and no trouble codes mean its driving habits and a question if a reprogram that may hurt mileage had been ...
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