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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 8, 2009
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Open Help Requests for GM
Help Request Answers
1981 Cadillac DeVille 4.1L Electronic VIN: 1G6A04748B
Good Morning We are working on this 1981 Cadillac deVille with Automatic Climate Control. We are looking for Climate Control PROGRAMMER. (This is the unit that mounts under the right side of the dash and is attached to the heater case.) 3 questions: 1)Wher...
1997 Cadillac Seville SLS 4.6L compressor VIN: 1G6KS52YXU
Covered all basics for caddys. made repairs to bad componets above.disconnected battery. If you ground pin 27 on ecm(green w/white to relay)compressor comes on. pressures are good,no acm codes,no body codes.pin 27 is relay ground.Thought ecm was problem,but sa...
1999 Cadillac DeVille 4.6L blower speed VIN: 1G6KD54Y7X
performed diagnostics on blower speed inop. thru diagnostic tree. led to replacment of blower motor,tried new blower motor but still inop. also tried known good ac programmer. still inop. checked controls with scan tool,everything operative. ( doors,compressor...
1999 Cadillac DeVille 4.6L HVAC cooling VIN: 1G6KD54Y3X
Please help. This Caddy came with complain AC not working, blowing hot air. But compressor is kicking and discharge pipe is very cold. Seems to be blend door on climate control does not operate. For some reason I can not find diag procedure on ALL DATA on line...
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on, VIN: 1G6KE54Y0X
Hi techs, This car is in my shop for driveabilty concerns and to get the fix done I have to replace both upstream O2 sensors. I was unable to find any info on how to replace the sensor at the back for bank one. The sensor is located in a very tight area betwe...
2006 Cadillac CTS V 6.0L MIL Lamp on VIN: 1G6DX67D46
This one was in and out(Customer waiting).Local parts house scanned code but "generic" gives no description. They went to the Cadillac dealership and they read codes then cleared.The dealer tried to sell them a "Supercharger Cleaning"(this is what the customer... Trouble codes: P1182 (Supercharger inlet pressure sensor performance), P1101 (Intake air flow system performance)
1998 Chevrolet Malibu LS 3.1L relay junction block VIN: 1G1NE52M4W
Helloy good friends at iATN This Chevy is way out of our specialities so please be patient Fans are not turning on as they should and we traced damage to junction block relay connector inside of it. Customer offered us to bring a used one from USA and so he...
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...
2001 Chevrolet Monte Carlo SS 3.8L no crank VIN: 2G1WX15K31
the body module numbler is [...]. it's lower than the new numbler of update. if you turn the key to crank. all the dash light go blank only service engine soon light on. if you release the key. it's dash light normal again. also found the battery terminal c...
2003 Chevrolet Impala 3.4L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G1WF52EX3
I am trying to help a friend and diagnose his car over the phone cause i wont get a chance to look at it for about a week. He called me about a week ago with misfire, he borrowed a scanner, p0300, he replaced plugs and found one that the ground strap was actua... Trouble codes: P0300
2003 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK23173
p0741- TCC performance/ stuck off This vehicle came in with code i drove didnt have tcc operation. Pulled pan to perform tsb someone had beat me to the punch. Brand new valvebody installed. Found a loose mounting bolt so loosened all up and retightend to spec...
2003 Chevrolet Express 2500 5.3L abs module VIN: 1GCFG25T23
van cam ein with abs ligh on scanner will not comuncate with ebcm changed ebcm with used unit still no cominication checked wireing can not find broke wire any ideas can not get codes with out comunication
2004 Chevrolet Express 3500 6.0L Surge, Stall VIN: 1GCHG35U54
Van stalls intermittently,mostly on start up. Sometimes idle races upon start up. Checked for vac. leaks,found none.Do not have a smoke machine.(still think i have an intake leak just can't prove it) Tested fuel pressure all ok,also holds steady with key off.T... Trouble codes: P0506, P0507
2002 GMC Savana 3500 5.7L engine VIN: 1GDHG31R22
Sorry guys, not alot of info to go on here, and I'm sure this is going to be one of those where I've overlooked the obvious. As you can see from the mileage, this vehicle is rarely driven, sits alot. After sitting, when cranking, it kicks back against the star...
2003 GMC Yukon SLE 5.3L Steering VIN: 1GKEC13T93
this yukon has a power steering problem only when moving very slow or not moving at all; the power steering works normal when turning to the left, but it binds up when turing to the right. it makes a hissing noise while it is binding up which sounds like a vac...
1996 Oldsmobile 88 Royale 3.8L Stall, Noisy Fuel Pump VIN: 1G3HN52K5T
This Olds has a fuel pump that gets quite noisy when it is hot. The customer says it has died for her a few times, but always restarts. It has never died for me. The pump was new about two months ago. I scoped the pump for current draw. It draws about 6.5 Amps...
2002 Oldsmobile Aurora 4.0L unknown surge VIN: 1G3GS64C62
we have this olds aurora with a surge at hwy speeds. we know there is torque issues with these 4t80e trannys but we can't seem to find exact specs on trans.does anybody have specs specifically slip speed @mph or any other suggestions.thanks for any help
2006 Pontiac Wave 1.6L reprogramming issue VIN: KL2TD59616
Hi techs, I did reprogram this car's ecm with the latest version using j-2534 bse device. Everything went just perfect during the programming session, and the car restarted fine but while roadtesting it, it ended up with no communication between the ecm and t...
2006 Pontiac Vibe 1.8L sir airbags VIN: 5Y2SL65846
this car came from a friends body shop with the sir light on when i checked the codes it has code b 1650 passenger pressence malfunction so i printed the chart and started testing {it says test switches and sensors with a dvom but it dont give any values}i l...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille 4.6L Ventilation VIN: 1GKD54Y2VU
Sorry but problem is intermittent and customer says he will come back if it gets more frequent.I appreciate the fact that you all stress the vacuum issue and will have a closer look into this. The programmer is quite expensive and I do not like throwing darts....
1998 Cadillac Eldorado ETC 4.6L Car runs great VIN: 1G6ET1291W
Replaced fuel tank pressure sensor. Ran EVAP test on snap on Verus everything looks fine. Thanks for all help. Mike Trouble codes: P0440.
2003 Cadillac DeVille 4.6L ecm/icm VIN: 1G6KD54Y93
1992 Chevrolet S10 2.5L Hesitation, Cuts out, MIL Lamp on VIN: 1GBCS10A7P
well after getting sick of this truck, the other tech took back over on it. he removed the fuel pressure regulator that i installed and found a tear in the diaphram.(came from the parts store defective!) The Cat broke up on us, and we changed that too. The tec... Trouble codes: 44 (lean).
1992 Chevrolet K2500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 2GCFK29K8N
Thanks so much to all who replied...I tested all the grounds on the vehicle and found the one on the fender next to the battery to had very high resistance...repaired that and went a step further by grounding the ecm case with a new wire. I returned the truck ...
2000 Chevrolet Impala 3.8L Stall, VIN: 2G1WF55K9Y
This was kinda of a tough one. The car ran fine most of the time and when it ran poorly it did so for about 45 secs then cleared up. Our service advisor suggested a fuel pump, he worked the desk at a chevy dealer for 17 yrs, so he thinks he knows something a...
2001 Chevrolet Blazer LS 4.3L left side motor mount VIN: 1GNDT13WX1
thanks for your time and replies.i used advice from all 3 replies but in the end i removed front differeential to complete the job.thanks again
2003 Chevrolet Silverado 1500 4.3L Warning lamp VIN: 1GCEC14X63
Kevin from Illinois gets the prize!!! The parking brake pedal was used extensively to get the truck to the shop (Instead of towing. Ended up costing the customer 5 times as much!!!) Turns out the brake pedal switch was jammed in the on position. I manually pul...
2003 Chevrolet Venture LS 3.4L Poor Idle Quality VIN: 1GNDX03E53
Apparently the previous shop had installed a TPS and while it seemed to functon properly 95% of the time we replaced it. We had learned the hard way that the previous shop had installed "dubious" parts. We had found a IAC motor forced into the bore, so in or... Trouble codes: P0122, P1122.
1998 GMC W3500 Forward W3S042 3.9L Engine VIN: J8DC4B1KXW
Thanks for those who responded. The request was for help on torque specifications for this vehicle. Didn`t know where to look. Thanks guys for the assistance. Mark
1999 GMC Jimmy SL 4.3L back light display on dash, climate contrl, radio VIN: 1GKDT13W5X
thanks to all that replied. Was using OE switches. Turned out that the gray wire that delivered power bulbs was occasionally shorting out under shifter consel. So that is why it would be alright for a while, then if consle got bumped lights would flicker or...
2005 GMC Canyon Z71 SLE 3.5L Driveline VIN: 1GTDT13605
Transfer case was replaced, problem solved. Thanks for the replies
1996 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C4T
Well folks, its gone! Many responses to injectors and Passlock issues--not the case. All injectors ohmed at 12 and injectors were being fired all the time while cranking--10-20ms. The only time the car wld start was if an external fuel source was added or if... Trouble codes: 1599 (engine stall).
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