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Prev Professional Automotive Repair Technical Discussions for March 9, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L heater core VIN: 1G4HP52L6S
Hi guys, I'm usually one giving advice on GM cars, not asking for it! But this car has got me stumped by having repeat heater core failures. The first 3 cores were AC Delco units, the current one, and the one that is going in it today are from Napa. I have ano...
1993 Cadillac Seville STS 4.6L No Start VIN: 1G6KY5294P
Description vehicle tries to start like its out of time. all ignition module outputs 24x 1/2 cam ok. ran test on 53 when vehicle running and passed the frequency test on the purple/ white wire, While road testing vehicle stalled and acts like its out of time. ... Trouble codes: 53 (4x refrence)
1996 Cadillac Eldorado 4.6L No Start VIN: 1G6EL12Y2T
Well I'm getting pretty stressed out on this,I hope somebody out there can help me.This car came from a trans shop.They dropped the rack to remove the side cover and make a internal repair.After putting everything back together the car will crank start and die... Trouble codes: P1631 (Theft Deterrent system password incorrect), B2750 (Pass Key Data Communication Failure)
2001 Cadillac DeVille 4.6L key fob VIN: 1G6KD54Y51
thanks for checking this one out! my customer has a faulty key fob (#1). # 2 still works. we purchased a new #1 transmitter and we need to program. we have a snap-on scanner but the only data i can find in alldata is to use a tech2 to program. all other cars w...
1994 Chevrolet K1500 5.7L possible transfer case VIN: 2GCEK19K0R
I am not well versed in transfer cases. This is my personal truck and I have had this noise since I bought it 7,000 miles and 2 years ago. The noise is like a snap with the low tone of a clunk. I can make the noise happen only in 4wd, under load (wheels straig...
1998 Chevrolet Camaro 5.7L cluster/starter VIN: 2G1FP2265W
I have code p1626... do not believe any fault here. have no instrument panel operation and no crank. have no power to icm on pin a13. have no ground comand at starter relay. ignition switch test good. all fuses good, getting power and ground at bcm. my history...
2000 Chevrolet Astro 4.3L air flow VIN: 1GNEL19W9Y
This van has developed a problem with the air flow to the driver's side. When you start it cold, the passenger's sidebegins to warm up very soon while driver's side stays cold for awhile. Also the vents to the floor do not seem to flow as much air so that the ...
2000 Chevrolet Suburban 1500 LT 5.3L Instrument cluster VIN: 3GNFK16T7Y
When you start the vehicle the ABS and Airbag lights stay on, the PRNDL display does not indicate what gear it is in, the message center switches from Battery to Security to Service 4WD continuously, and the fuel guage goes from empty to 1/4 to empty. I have c...
2001 Chevrolet Silverado 3500 LS 6.6L Cooling Systems VIN: 1GBJC341X1
this truck will push coolant out of the overflow bottle first thing in the a.m.,put combustion tester on,head gaskets seem ok. it builds up a lot of pressure in the system, pulled the return coolant line off the turbo and put a pressure gauge on it,crimped off...
2001 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on, loses power; fuel pr VIN: 1GCHK29111
We have seen this truck a few times before, always ran strong, pretty well maintained. Engine oil not fuel contaminated. On morning cold start (air temp 0 degrees F or colder); engine heater plugged in overnight or not; loses power (any where between leaving d... Trouble codes: P0093 (Fuel Sys. Large Leak Detected)
2002 Chevrolet Cavalier 2.2L #3 cylinder VIN: 1G1JC12462
Hey group, Have this 2.2 with PO303, 50 psi compression and 100 % cyl. leakage from exhaust/crankcase. Removed valve cover to inspect valve train with all looking great. My main question pertains to the misfire- it goes away at higher RPM(above 2000 RPM). Why?...
2005 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13540
This vehicle has been driven by us for the last year or so. And has seen regular oil changes and any maintenance needed. The vehicle runs great the only thing of concern is the CEL. The code is po410. I have looked up TSB's and have made a search of the arcive... Trouble codes: P0410
2006 Chevrolet Suburan 5.3L Surge, Misfire, MIL Lamp on VIN: 1GNEK16Z66
this sub has a mis fire on #7 cyl at idle if rpms raised to 1500 miss is gone.I have looked at the plug wire and coil swapped to different cyl.swapped injector checked fuel rail for obstruction.checked compression.smoked tested for vacumn leaks none found.pull... Trouble codes: P0300
2003 GMC Savana 3500 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GDJG31U73
hey techs. got this gmc box van that runs great most of the time. every once in a blue moon.(twice in the last three weeeks this idle will flare up to 900 to 1000 rpm and hang up there. i thought i had bad iac motor. replaced it and then relearned idle . iac s... Trouble codes: P, 0507 (idle speed too high), P0300
2003 GMC 4300 7.5L Lighting VIN: IHTMMAAM03
This truck is as follows: 2003 International 4300 [...] 102762 mileage There was no International-Harvester listed in the post listings. Good evening We have this International Harvestor 4300 with no brake lights. We thought this was going to b...
1996 Pontiac Grand Am GT 3.1L No Start, Stall VIN: 1G2NW12M8T
Car was towed to the shop with a no start condition. We found the car would start and then shut down immediately. It acts as if the security system is shutting car down, however the theft light is not blinking. We checked for codes and only found code 1573. ... Trouble codes: 1573 (no communication between ebtcm/pcm)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L engagement VIN: 1G4CW52L6R
Thank for all the help it was the front input clutches were smoked, valve body needed to be gone thru, thanks again.
2002 Cadillac Escalade 6.0L ride control VIN: 1GYEK63N82
thanks to all who replied. it was the steering wheel position sensor. was not to bad of a job to do, took me about 30 mins . its a [...] hard for a big guy like my self to get under the dash to get at it but i was able. thanks for all the help
1993 Chevrolet Lumina Euro 3.1L Excessive Emissions, Poor Idle Quality, Hesitation, MIL Lamp on, VIN: 2G1WN14TXP
Let me start by Thanking all that replied I had 20 responses thats amazing I'm sure somewhere along the line I did have a ground issuse Heres what I did I supplied 3 extra Ground Wires to the car 2 Off Battery 1 to radiater support and 1 to engine and for my o... Trouble codes: 15 (temp signal high), 17 (crank signal shorted), 35 (iac problem), 36 (dis fault extra or missing est pulse), 43 (est module circuit problem), 51 (ecm prom error).
1995 Chevrolet K2500 Cheyenne 6.5L high idle VIN: 2GCFK29S1S
The 'repair' was simple thanks to Cory [...]...
1996 Chevrolet K3500 6.5L Stall VIN: 1GBHK33F6T
Thank you all, as almost all of you thought it was the injector pump module. changed it, problem gone thanks again Dave
1998 Chevrolet Lumina 3.1L Hesitation, Surge, Cuts out VIN: 2G1WL52M5W
I finaly got this car back. I found the fuel trims did not drop when the car was cutting out so i did not put a guage on it. After 15 of the replies said it soundes like a fuel problem, I put a guage on it and the fuel pressure was dropping when the car cut ou...
1999 Chevrolet Malibu 3.1L Poor Idle Quality, Stall VIN: 1G1ND52M4X
we did a smoke check. we took the purge canister off and checked it. then we replaced the canister. re tested the car after refilling the tank the car did not stall
2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J91
So far I have pulled the radio out of the car to be able to get to the power wires to the ignition switch. The car has run fine for a week with the radio out but still plugged in. I am having the Customer bring in a differnt key to see if that has any differen... Trouble codes: P1189 (oil pressure circuit returned), U1040 (bus code returned), P1626 (theft history never returned), P0452 (evap history never returned), C1255 (abs history never returned), U1000 (bcm returned).
2002 Chevrolet Silverado 1500 5.3L reverse lamps VIN: 2GCEK19T32
Thank you all who helped on this one. It was the switch. Made me crazy because i know i was behind the truck just after the install with it running in park. And I did not remember the feeling that I was about to be backed over. I guess even Delco parts fail on...
2004 Chevrolet Impala 3.8L dash panel direction control switch not working VIN: 2G1WF52E14
still waiting for owner to bring car back, says he has to save up money for part and repair. i checked and pulled fuses for hvac module,didnt fix , will replace hvac module when owner is ready. thank you to every who helped.
2004 Chevrolet Express 3500 LS 6.0L Power Steering VIN: 1GAHG39UX4
Thankyou for the time and expertise of my fellow iatn members. Especially Peter, Dale, and Craig for the reassurance that this would most likely solve the problem. We performed the cold climate flush but we haven't seen low temps and hopefully won't. I'll have...
1994 Geo Prizm 1.6L Poor Idle Quality, Hesitation, Stall VIN: 1Y1SK5368R
I am sorry to say this car has whipped me! Thanks for all the input,I was able to narrow it down to either the ecm or dist.The scanner showed that the timing was advancing but at the crank it had no adv. refered to our local dealer and wished him good luck.(fp...
1998 GMC Jimmy Envoy 4.3L Hesitation, MIL Lamp on VIN: 1GKDT13W7W
The reason i haven't sent a post on this jimmy is the customer hasn't brought the truck back yet but when he doe's i will send a fix. This customer has a car lot so he has been keeping me busy along with the other customer's that i have to take care of. thanks... Trouble codes: P0122, P1122.
1999 GMC Jimmy SL 4.3L front axle VIN: 1GKDT13W3X
hello fellow members. i regret that i did not get to fix this problem as the customer had been thinking about a new car for a while and it seems this problem was the final straw. thanks for the reponses. one reply was tccm possibly had water intrusion. a coupl...
2003 GMC Savana 3500 6.0L rear differential VIN: 1GJHG39U93
Thanks for the replies, phone call and faxes. From this info and Dana I was able to determine this is a Dana Super 60 derivative only serviced by GM parts. 4 area GM parts departments couldn't tell me what model and only offered complete axle units. Since then...
1999 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G3GR62COX
thanks to dave, kevin and tadd. the pcm had a defective driver. replacement of pcm and re-program fixed the vehicle. Trouble codes: P0440.
1999 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 1G2WR521XX
Thank you everyone for your help. I finally got this one fixed. Here's the story, when I first got the car it came in with the harmonic balancer coming apart. I replaced the balancer and crank sensor. I assumed since this car came from a used car lot auction t... Trouble codes: 300 (random miss).
2002 Saturn SL2 1.9L Hesitation VIN: 1G8ZK52762
Hello and thank you again for all the input I do appreciate it well lesson learned on after market parts I put in OE plugs(NGK)and wires from the dealer runs great now thanks again to all
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