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Prev Professional Automotive Repair Technical Discussions for January 8, 2007
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Open Help Requests for GM
Help Request Answers
2004 Cadillac DeVille 4.6L No Start VIN: 1G6KD57Y44
Car was purchased not running with light collision damage on front end after body repairs done was brought to us the first thing we noticed was no mil light when key turned on we printed wiring diagram and checked all powers and grounds at the ecm they were ok...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GNDT13WXS
my question is .. has anyone come across a way to eliminate the carbon ( ie: a method of cleaning it out) without removing the intake completely? thanks in advance for any help anyone can provide jack "a first choice auto" Trouble codes: P1406 (egr pintle stuck open)
1996 Chevrolet C2500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 1GCGC29R2T
Hi guys, I need some advice on this Chevrolet truck. It had a new fi unit with intake gaskets about 3 yrs ago. Over the last 2 months it has begun setting codes intermittenly. The only driveability problem is slight roughness at idle in gear only. Codes are P1... Trouble codes: P0172, P0175, P0300
1997 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1440V
this one came in at the end of the day wouldn't rev up checked fuel filter blocked replaced it same thing. the only time i had left was to gather the codes and head out the door.the two tps codes 122 ,123 ithink ihad the same problem once before ,had aused tps... Trouble codes: P0108, P0122, P0123
1998 Chevrolet S10 LS 2.2L high idle VIN: 1GCCS1941W
I installed rebuilt cylinder head, new T statt, water pump. Found unattached vac line that goes to a nipple in LF fender and Tees into a tube in a wire bundle that goes through the firewall. The hose was brittle and broken. I have no idea where tha vacuum sour... Trouble codes: 507B
1999 Chevrolet Silverado 2500 6.0L oil cooler lines VIN: 1GTGK29U2X
I have this 99 chev new body style for that year. We are replacing the engine cooler lines. The new ones from gm part number [...] and are a newer style [2001 and older]. My under standing is they are for 2001up trucks and on the older trucks you have to mo...
2002 Chevrolet Silverado 2500 HD 6.6L Transmission VIN: 1GCHK23142
Need help with Allison trans completely inoperitive. We have had in several times for same condition, 3 to 4 weeks between visits. When ever it rains trans will not move in any gear range. Have checked other help requests that suggested replacing trans range s...
2002 Chevrolet Astro 4.3L Hesitation VIN: 1B7GL22X8S
Van came in for no start. replaced dist cap and rotor, van ran fine. Cust returned two days latter with very lacking in power.Van starts and idles fine but has VERY little power.There was a code for MAF sensor, i,m at home and can,t remember the code.The cust ...
2003 Chevrolet C4500 Kodiak C4C042 6.6L fuel gauge VIN: 1GBE4E1153
The fuel gauge reads empty with fuel in the tanks. The pcm sets p1172(fuel transfer pump flow insuf.) and the gauge defalts to empty. My problem is I have no information on this truck. Alldata and mithell go up to 3500. My friend who works at a GM dealership (...
1991 Geo Tracker 1.6L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 2CNBJ18U6M
Hello everybody. I have a Geo Tracker here that is chock full of electrical gremlins. This unit will start and run but all of the computer outputs "buzz" with KOEO or KOER and runs very rich when it is running. I am unable to retrieve codes from from ECM. ECM ...
2000 GMC Yukon XL 1500 SLE 5.3L Key fobs VIN: 3GKFK16T6Y
Good day!I've got intermittant keyless entry problems,The customer requests that his key fob unlock the drivers door,with key in ignition and engine running.I have the auto locks enabled,and sometimes if you drive the truck till the locks actuate,put in park,e...
2004 GMC C8500 7.2L Oil System VIN: 1GDM8C1C54
Hello Jim here..once again asking for some help or direction today. While doing a PM on this 2004 C8500 GMC Dump Truck, with a CAT 3126 engine I came across something I really have not experienced or seen.While draining the oil ,it started to rush out of pan a...
1999 Saturn SL1 1.9L Surge, CODE P0401A VIN: 1G8ZH528XX
I have this car with intermittent problem... Intermittent code P0401 shows up once every 2 months customer complain of Intermitent lack of power under smooth acceleration just after a cold start (witch I have not been able to reproduce) I have the good EGR va... Trouble codes: P0401 (EGR insufficient flow)
2001 Saturn L200 2.2L Cylinder Head VIN: 1G8JU52F21
Hey Guys, This is my first Saturn with the "Broken Timing Chain/Warped Valves" problem. My info says the head bolts torque to 22 ft/lbs and then an additional 155 degrees. Does that sound about right to y'all? Sounds kinda fishy to me. Thanks for your time.

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet Lumina APV 3.1L starts & dies VIN: 1GNCU06D2M
Well gentlemen, don't know what to say. Checked everything out that was suggested and could find no problem. So I ran the van down the road and got it warmed up. Then started it about six times in a row with no problems. The only conclusion I could come up wit...
1999 Chevrolet Tahoe LS 5.7L MIL Lamp on VIN: 1GNEK13R9X
Well gang, this Tahoe of my wife's is finally fixed, it has completed the required(however vague) drive cycle before emmission testing & has passed the test. But I must admit that I am amazed at the cause. Dan [...] had the cause n... Trouble codes: P0308.
2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNDM19W2Y
Thank you to everyone who replied. I had already tried an AC Delco cap and rotor. There was no difference. What finally fixed the car was a new distributor from GM. Trouble codes: P0300 (Random Misfire).
2001 Chevrolet Impala LS 3.8L Surge, Misfire, MIL Lamp on VIN: 2G1WH55K31
the #4 injector was causing the problem installed a new one and worked great after.thanks to all that replied. Trouble codes: P204.
2001 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W81
Wow, 28 replies! First of all I want to thank each of you for taking the time to help, it truely is appreciated. The general consensus seems to be to use an OEM cap and rotor. Lots of good suggestions regarding other areas to look at. This does not appear to...
2002 Chevrolet Express 2500 5.7L ABS module VIN: 1GCGG25RX2
Customer has decided to run this vehicle ,until it starts to give him some serious problems.I told him that it would probably to new abs module.He didn't want to spend that kind of money at this time.Several replies referred to a bulletin about a ground proble...
2002 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W02
First of all, Thanks to each and every one of you who took the time to help. A special thanks to Dave [...]. I was so focused on fuel press. loss I never did go back and do voltage/amperage test AFTER we wired in the new...
1996 GMC C1500 Sierra SL 5.0L external lights VIN: 1GTEC14M5T
thanxs to all the helpful replies,this truck didn't have trailer pack.after going to all the wires to the dash with bad of the e-mail i got said to check the drivers door. we took it apart and found that a window regulator had been replaced and wires ...
2000 GMC Sierra 1500 SL 4.8L 2-3 3-4 shift VIN: 2GTEK19V8Y
Thanks Guys, upon further inspection we have found that the third gear band is burnt out of this thing. It is down the road to the tranny shop. Thanks again for the help
2001 GMC Cab & Chassis Sierra 3500 8.1L Drive indicator VIN: 1GDJC34G81
Thanks to all the replied. We replaced the PNP/NS switch on the trans with the updated brown part. It did not change anything. We replaced because of being an updated part and the fact that the connector was full of moisture and green corrosion. We tested the ...
2002 GMC Envoy SLE 4.2L Differential VIN: 1GKDT13S52
i replaced the front actuator/switch for the front differential and it worked great. several of the replys said after finding a short (at a/c compressor) the actuators go bad. i still think this vehicle also needs a encoder sensor but customer wants to wait fo...
2001 Oldsmobile Alero GL 2.4L battery VIN: 1G3NL52T91
The underhood fuse is for the right side interior fuse panel. the customer said she was having prior problems with the radio and had some work done to it. He was going to take it back to the repair facility and let us know what happened. Not a word as of yet. ...
1992 Pontiac Grand Am SE 3.3L engine VIN: 1G2NE14N9N
You guys were all right, we did a block test, and it failed, we got the ok to send the heads out and do a head gasket, thanks to all for aid, and assist
1996 Pontiac Sunfire SE 2.2L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: IG2JB1248T
I want to thank the 9 people who replied. This a good example of never to second guess yourself. I knew going into this that these injectors need to be replaced with GM injectors and all need to be replaced. We replaced them but from the aftermarket. So we dec... Trouble codes: P0303, P0172.
2002 Pontiac Grand Am GT 3.4L Surge VIN: 1G2NW52E12
Hello everyone just letting you know what I found on this Grand-Am, John from Missouri said block the EGR valve, did this and no difference, thanks anyways. Stephen from British Columbia talked about Maf Sensor and I drove it with it unplugged and made no diff...
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