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Prev Professional Automotive Repair Technical Discussions for October 16, 2007
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L control head VIN: 1G4HP52L8R
Hello and thank you in advance for any help, We have a 1994 Buick Le Sabre in the shop with HVAC controls stuck on defrost. I found a vacuum hose off under the hood going to the vacuum tank but the problem we have here is electronic. It has the manual system ...
1999 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K1X
I have a 3.8 with multiple cylinder missfires #3 #6 cylinder miss at same time I have tried replacing the coil and module with known good wires and plugs are new and look ok what I want to know is there something related to these two cylinders (cam sync or cra... Trouble codes: P0300
2004 Buick Rendezvous CX 3.4L a.b.s.pump VIN: 3G5DB03E24
the problem only occurs at low speed stopping 3-7 miles per hour. during hard or normal braking you never feel it
1994 Cadillac DeVille 4.9L Engine VIN: 1G6KD52B5R
This car came in no start- tried to start a few times and the starter (which was removed and bench tested) just groans hard and won't turn motor. Motor will not turn clockwise by hand either. It will turn counter clockwise completely through its cycle. It WILL...
1995 Cadillac DeVille 4.9L pump noise VIN: 1G6KD52B4S
well here is another one guys, i'm pulling out my hair. deville with a power steering noise. it howls and groans, it seems to subside when you turn the wheel, but makes good noise when just sitting idling, if you wiggle the steering wheel it seems to subside a...
2002 Cadillac Seville STS 4.6L Intermediate Shaft VIN: 1G6KY54942
Caddy has a clunk felt in steering wheel especially while turning. Have updated Intermediate shaft ready to install. Just looking for some guidance before I do this. I have removed the lower column covers, how do i get to the upper bolt under the clear plastic...
1986 Chevrolet K30 Custom 6.2L tachometer VIN: 1986CUCV62
quick question I'm not the greatest diesel mechanic but I'm interested in them I own one and I have a tach that i would like to put on it now reading around i'm seeing something about hooking up to the altenator ??? will send the signal to the tach ??? If so w...
1995 Chevrolet C1500 Cheyenne 5.7L Hesitation VIN: 1GCEC14K5S
Hey Fellow Techs. Thanks in advance for you help. This truck came to my shop the first time with a tip in hesatation when taking off. I checked the EGR selenoid it was ok, checked the vac and all ok. The EGR vac syst. all checked ok. So I suspected the egr va... Trouble codes: N/A (none)
2001 Chevrolet Blazer LS 4.3L key removal VIN: 1GNDT13W91
customer complaint is he can't remove his key most times after driving the vehicle. i thought this shouldn't be this difficult to remedy. i found the solenoid at fault and showed him how to release the key by pushing the plunger with a pen thru the provided ho...
2003 Chevrolet Silverado 2500 6.0L MIL Lamp on VIN: 1GCHK23U23
please help gm techs. i have a fleet customer at times. sets p1516. have performed service bullitin doc#1346034. have inspected yellow feed circuits for opens. with lab scope on circuit#486 which is tp sensor2 signal it shows lots of (noise) ie poor pattern. i... Trouble codes: P1516
2004 Chevrolet Suburban 1500 LS 5.3L Misfire VIN: 3GNFK16Z74
Hi Chevy Techs, I have been helping another shop on this Suburban and there is another vehicle at another shop doing the same thing. Number seven cylinder has a misfire at idle. When you raise the rpm's to around 1500, the misfire goes away. If you go above 1... Trouble codes: P0300 (Random misfire), P0307 (Cyl. 7 misfire)
2004 Chevrolet Silverado 3500 6.6L flywheel bolts VIN: 1GCJK39124
We can't remove the flywheel bolts. If no special proceedures are used, possibly the other shop glued them in. Just want to know if these are normal bolts that remove in a normal manner.
2002 GMC Sonoma SLS 4.3L 4wd VIN: 1GTDT13W42
During hard acceleration in 4 wheel drive there is a loud bang-pop noise coming from the front of the truck about once every ten feet. It feels like transfer case chain jumping over a gear tooth. I have removed rear drive shaft and driven truck in 4 wheel driv...
1971 Oldsmobile cutlass 350CID rocker stud VIN: 332871M114
good morning all, i have a question.. this cutlass has a chevy motor in it and it has a broken rocker stud broken almost flush w/ the head..according to the info i have available the stud is pressed into the head. can this be removed w/ the head on the car or ...
1997 Pontiac Sunfire SE 2.2L No Start, MIL Lamp on VIN: 1G2JB524V7
vehicle will try and start but it backfires threw the intake, like its out of time and dies, spark plugs are black vehicle is flooding out.checked compression, shows 125psi on all cylinders.vehicle did run for 5 minutes one time. checked vacuum while running i... Trouble codes: P1601 (pcm serial comm or ecm overtemp), P0300 (random cylinder misfire), P0440 (evap emissions system fault)
2002 Pontiac Sunfire SE 2.2L overheating VIN: 1G2JB52452
the car came in with an overheating problem.i have replaced the head gasket due to leakage the vehicle is still over heating. the thermostat@radiator have also been replaced. the waterpump was removed and inspected and looks good.after about 2to3 miles of driv...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Regal 3.1L Stall VIN: 2G4WB54T3P
This buick had an ecu that does require programming to operate. I called another local dealer after talking to several people at the dealership I purchased the ecu from and they said that right on the parts data base was a note saying that the ecu must be fl... Trouble codes: 46 (vats).
2000 Buick LeSabre Limited 3.8L speakers VIN: 1G4HR54K0Y
I'm sorry it took so long. Thanks for all the help. I pulled the radio out and retested for a shorted speaker. The ground for the right rear speaker was grounded out. Traced wiring from speaker to where wiring enters passenger compartment and found wire in...
1966 Chevrolet impala 327CID drum VIN: 168376Y101
Thank you everyone for the overwhelming response! Everyone's specs information was more than we could find in print anywhere.
1989 Chevrolet K1500 Cheyenne 4.3L No Start, Poor Idle Quality, Surge, Cuts out VIN: 1GCDK14471
Thanks for all the help! After I replaced the IAC valve and installed another oxygen sensor, the truck still had a rough idle. No external vacuum leaks so I injected propane into the valve covers and idle did not change. The last thing I suspected was contamin... Trouble codes: 45 (Rich Exhaust).
1999 Chevrolet Silverado 1500 5.3L several items
I always hate to post a fix like this. Truck came back from dealer with fuel guage still inop. Yes, the truck is "fixed", meaning fuel guage is now working properly. There were several problems, all with dissimilar causes. The power mirrors was a bad switch. ...
1999 Chevrolet S10 LS 4.3L lifters VIN: 1GCCS1941X
2000 Chevrolet Silverado 1500 4.3L Excessive Emissions, Hesitation, Stall, Poor Fuel Economy VIN: W1YE278955
Thanks to all of you that took the time to respond with help. I feel like a fool, because this is something that I know and should have done right in the beginning. Most of you figured it out right from the description - it was bad fuel, or more correctly, i...
2001 Chevrolet Monte Carlo LS 3.4L b3128 code VIN: 2G1WW12EX1
Replaced BCM with a new GM unit and problem is taken care of. BCM problems seem to be very common on this model. Thanks to those who responded.
2001 Chevrolet Silverado 1500 HD LS 6.0L Hesitation, Surge, Stall, MIL Lamp on VIN: 1GCGK13U91
Sorry, this vehicle has not come back. If it does and I get it repaired, I will try to remember to post a fix. Trouble codes: P0300.
2003 Chevrolet Tahoe LT 5.3L Transfercase VIN: 1GNEK13Z53
Just wanted to thank all who responded, many of you hit the nail on the head when suggesting the Range Position Sensor (no. [...]) located under the larger gear in the transfercase motor. we changed it about a week ago now and customer took vehicle on a tri...
1994 GMC K1500 Sierra SL 5.7L No Start VIN: 2GETK19K5R
well after a dozen other repairs were done we finally got back to 94 gmc p/u and found terry from oregan and scott from illinois were right and all though a new tps was installed at other shop it read 4.48 koeo so we installed another new one and truck starts ...
2007 Saturn Outlook XE 3.6L air bag light
concensus was that the air bag module needed to be programmed by Saturn, since its a brand new vehicle, had Saturn program and light went away so all is good. all codes cleared. thanks to all that replied. programming cost $75.00 not bad.
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