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Prev Professional Automotive Repair Technical Discussions for October 8, 2009
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Open Help Requests for GM
Help Request Answers
1993 Buick Century Limited 3.3L Hesitation VIN: 1G4AG55N5P
Ok you GM guys. I never seem to have good luck with pre-obd-II diagnostics. This '93 century came in about 6 months ago with a no start. (cranks no fire) Found the fuel pump was the culprit and replaced it.(and the filter) The customer took it home and parked ...
1996 Buick Roadmaster Collector's Edition 5.7L Misfire, MIL Lamp on VIN: 1G4BT52P2T
misses on cyl # 4 continuosly backfires through exhaust instaled new cap ,rotor,wires,plugs twice still misses cyl 4. installed new injector no change compression 180 fuel pressure in spec vaccum excellent valve springs not broken rockers ok pushrods ok in ori... Trouble codes: P0300 (misfire detected)
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 ...
1994 Cadillac Eldorado 4.6L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G6EL12Y9R
Good afternoon. This vehicle came in with cel on. It was scanned and P085 was found. The code was cleared and returned. Diagnostic routine was followed and the idle control was found to hang up. I replaced the control and went to relearn the TPS/idle control a... Trouble codes: P0080
2001 Cadillac DeVille 4.6L Poor Idle Quality, Surge VIN: 1G6KD54Y21
Hi and thanks for reading my post, I have this 2001 deville that surges at idle. No codes no vacume leaks that we can find tried the rubber boot and iac with no help, all fuel trims are normal at this tmie aroud 0-4% only does this at idle. I did see someone r...
2002 Cadillac DeVille DTS 4.6L steering VIN: 1G6KF57992
Customer brought in for hard steer at idle or when braking slow. Found large leak at P/S pressure hose that was leaking onto serpentine belt. Replaced hose and belt. Cleaned up area. System was bleed properly. This vehicle DOES NOT have hyro-boost. We have fo...
1988 Chevrolet C2500 Silverado 5.7L Cuts out VIN: 2GCFC29K0J
customer was driving truck and it died. was towed and then checked and was found to have no injector pulse or spark. replaced ing module and truck ran ok and soon as it got warm it quit again. tried another ing module as we have had some defective ones and it ...
1990 Chevrolet C1500 Cheyenne 5.7L Surge VIN: 1GCEC14K9M
truck came in with with a sruge in second and third gear. test drove the truck and it would start at 60 km to 90, when it started surging, your speed would drop. so went to the shop, checked the plugs, wires, cap, rotor, and pulled the dist. found the plugs fo...
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 codes stored. could not find the problem exactly other than distributor bushing was making noise and truck was in poor tune, ...
1999 Chevrolet Tahoe 5.7L Reverse 2/3 Flare VIN: 1GNEC13R1X
I sure need some input on this one. This is my sons truck and I have a little more time than I do money. This one has several different symptoms. They seem to change up a bit...but here goes. When first started and until about op temp everything is fine. Then ...
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...
2002 Chevrolet Silverado 2500 HD 6.6L Misfire VIN: 1GCMC29132
Got this 02 2500 pick up with 6.6 that is skipping on cylinder #3. The cylinder has a lot of oil in it and not sure how it is getting there. Any ideas on what could have happened and also I have a 6.6 in a wrecked 06 2500 and wondering if it may work in the 02...
2003 Chevrolet Impala 3.8L compressor VIN: 2G1WF55K13
Please help with this one , a/c compressor has been replaced due to failure 4 times along with o tube and accumulator and condenssor, first one was replaced in feb of this year car came back less than a month later with compressor making noise that one lasted ...
2005 GMC Sierra 1500 4.3L cannot refuel VIN: 1GTEC14X05
hello,and thanks for taking the time to read this.customer complained of having to pull the pump nozzle 1/2 way out of the filler neck,and can only squeeze trigger 1/2 way or pump shuts off,making refueling a chore.i have removed and checked the vent valve,as ...
2005 GMC Sierra 3500 6.6L Hesitation, Cuts out, Misfire VIN: 1GTJK33225
This truck originally cam in for running rough and a pinging sound from engine, 2 months ago, Now back for same concern. Truck will miss while driving. I originally replaced cam sensor and checked tone wheel, appears ok. Came back in with above codes. Cleared ... Trouble codes: P0016 (cam and crank correlation), P0301 (missfire 1 cyl.), P0335 (crank sensor), P0341 (cam sensor), P1223 (inj. 1 output circuit)
2007 GMC Sierra 2500 HD SLT 6.6L No Start VIN: 1GTHK23687
Good morning all! Need some GMC help here PLEASE!!! Unable to program new ECM, but it begins with no start...Truck was rebuilt by local bodyshop tech. Truck was driven for several days after bodywork,then 1 day no start.Scanned(p0340),verified circuits,replace... Trouble codes: P0340
1997 Oldsmobile Achieva S 2.4L MIL Lamp on VIN: 1G3NL52T9V
SES light on code p1336. Using Snap-On Modis code clears but immediately returns. Tried relearn procedure with Modis, replaced crankshaft sensor and tried to relearn it. When performing relearn procedure with Modis, instructions are to accelerate to full throt... Trouble codes: P1336
2006 Pontiac G6 3.5L steering rack or steering motor VIN: 1G2ZG55816
this car came from a used car dealer, it was brought in with a vibration and steering problem. we replaced the outer tie rod end on the drivers side. this removed all slack in steering. when parked it turnes very easy to the left but hard to the right. i have ...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac Escalade 6.0L No start. VIN: 1GYEK63N13
Thanks for the great responces. This Escalade has every after market item ever offered installed on it with some of them wired to the pcm. We believe these devices are the problem or cause a componet failure. The customer wouldn't let us unhook anything and sa...
1995 Chevrolet Camaro 3.4L Excessive Emissions VIN: 2G1FP22S0S
I took the manifold off and as I said before it was clean and clear, it has one port only and real simple system. Sadly I wasted my time taking the manifold off. After I replaced the cat NOX went down to 501 from 860. Here's the trick - I took the EGR off, ...
1997 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC5241V
Many thanks for the people that took time to help me, most said the same thing the crank sensor is a problem removing. I had to remove the oil pan to access and punch it out. the interesting thing when i installed the new sensor i had to take sandpaper and re...
2000 Chevrolet C3500 5.7L No Start VIN: 1GBGC34R1Y
Well this one is fixed, when the spider is unplugged power to the fuel pump is restored. Thanks Jerry for answering my question about the 2 problems being related. The new spider fixed both issues. The ecm I fuse powers up the fuel pump relay when key is on. T...
2004 Chevrolet Express 2500 LS 6.0L power window VIN: 1GAGG25U44
Hi guys! This morning Trevor from illinois is my hero! He hit it right on!The blue power wire inthe passengers side door chafes on a sharp edge on shorts to ground.At first glance it may catch you attention but cut open the tape for closer inspection and you w...
2003 GMC Yukon Denali 6.0L abs module VIN: 1GKEK63U53
Thanks for everyones help, problem was in left side reluctor wheel. There was noway to verify this just replaced it out of frustration. removed the sensor conector and used small video scope to look inside all i could see was a peice of rust between two teeth.
2004 GMC Winnebago 7.4L No Start, Cuts out VIN: 5B4MP67G44
The connection on the TPS was looseing connection and setting code for lost PCM found that the wheather pack on TPS was off and got to wet and to hot to hold connection replaced connector and things or good Thank you for all your help Trouble codes: U0107 (Lost Comm.W/Throttle Actuator).
1991 Oldsmobile Cutlass Supreme SL 3.4L No Start VIN: 1G3WS51X0M
unfortunetly the car never died again while in our possesion. the customer will return the vehicle when it happens again. i guess better luck next time:) thanks for the advice. it seems we all came to the same conclusion. crank sensor or module??? 2....
1999 Pontiac Grand Prix GT 3.8L DayTime Running Lights VIN: 1G3Z44G7A3
thank you to all that opened my eyes and saved me lots of time. its been a week and no news is good news. we took the ignition switch apart and found all the contacts burnt. surpriced this car started. thanks again Victor
2002 Saturn L200 2.2L Power door locks VIN: 1G8JU54F82
Thank you all for taking the time to reply to my help request. As each and everyone who replied mentioned problems with the BCM. I checked both fuse blocks in the kick panals and they were clean, dry and connections were tight. The plastic is still is tack. ...
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