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Prev Professional Automotive Repair Technical Discussions for April 8, 2010
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Limited 3.8L Cuts out, Stall VIN: 1G4HP52K9V
Hey folks, got a Buick w/intermittent stall, car will start right up and be fine. Seems to stall while rolling to or at stop sign/light, meaning foot of gas slower speeds. I have replaced crank sensor, fuel filter and IAC motor, cleaned throttle body. Not sure...
1994 Chevrolet Camaro 3.4L clutch VIN: 2G1FP22S4R
have a clutch job that has gone really bad on me!!! car was towed in for no clutch. after checking car out determinted it needed a clutch. have installed new clutch, new slave and master clyinder, resurfaced fly wheel.. probolem is that the clutch will not ful...
1997 Chevrolet Blazer 4.3L abs VIN: 1GNDT13W8V
Hi all, hope someone has seen this issue before. The ABS and red brake lights will come on after going about 5+ mph. They flash on and off intermittently. Only one of them on at a time. No codes found in the ABS system. With a tech2, mph looks good on all 3 se...
1997 Chevrolet Malibu 3.1L abs VIN: 1G1ND52M4V
car sets c1232 (open/short l/f speed semsor) as soon as key is on and brake is depressed. all 4 sensors measure equal resistance through the complete circuits measured at ecm connector. all sensors create a/c current when wheel is rotated. all 4 sensors read t...
1998 Chevrolet Corvette 5.7L SPS Sensor? VIN: 1G1YY22G5X
This Car will throw a c1255(ebctm internal malfunction) and a C1281(sps sensor uncorrelated) code, always together, and only when the car hits a pothole or decent sized bump in the road. It sets these codes daily on rougher streets or railroad tracks, and they...
2002 Chevrolet Silverado 1500 4.3L motor VIN: 2GCEC19W92
hello fellow techs.Ihave a 02 silverado with a 4.3 that is driving me crazy.It came to the shop with a complaint of a vibration just off idle and on decel from 45-40mph.The problem occurs mostly at 1000-1200rpm.It doesn't matter if the truck is in park,drive,n...
2004 Chevrolet Trailblazer LT 4.2L headlamp/drl VIN: 1235G45871
It appears that the grounds are okay and there is no voltage drop. The headlamp plug kees burning through at the pins.
2005 Chevrolet Impala LS 3.8L speedometer VIN: 2B1WF55E45
I am about to release this nightmare to the dealer unless I can figure out where to go from here. The glitch is very fast and happens at 40 to 50 mphs.
2006 Chevrolet Silverado 1500 LS 5.3L Misfire, MIL Lamp on VIN: 2GCEK13T46
truck came in with misfire cust wanted plugs and wires. installed plugs & wires still has misfire on #6 cylinder only. only skips at idle runs good off ilde it is idleing at 650. swapped coil and injector, fuel pressure is 63 psi, vaccum is 19, long term fuel ... Trouble codes: P0300 (ramdon misfire)
2007 Chevrolet Uplander LS 3.9L MIL Lamp on VIN: IGNDV33W57
Hi guys, Here that Uplander just keep kicking my butt.Car came in with CEL onand P0172 rich bank.LT trim -5to-25 ST trim -5to-15.Engine runs and drives ok no any other codes.MAP and MAF reads correct.Composite fuel reset,clean the injectors,plugs ,wires.O2 sns... Trouble codes: P0172 (Rich bank)
2008 Chevrolet Silverado 1500 LS 4.8L blower motor VIN: 2GCEC13C38
Hey Guys, I have an 08 chevy 1500 that has a very wierd problem. This problem is intermittant. Sometimes the blower motor will come on all by itself, without the key in the ignition. I have checked all wiring for a short to voltage and they all look good. Kind...
1997 GMC K1500 Sierra SL 5.7L booster VIN: 1GTEK14R8V
the brakes work great in this truck, they stop normally and feel great, they have normal wear and all is fine no issues on all four corners.but when you perform a panic stop the pedal is really really stiff for a few seconds then abs takes over. but the issue ...
2001 GMC Safari SLT 4.3L Poor Idle Quality, Cuts out VIN: 1GKDM19W21
Vehicle came in with complaint of hesitation, basically when you step on the gas it cuts out like its starving for fuel. While its doing this the fuel pressure is @ 47-50 psi...I couldn't find a running fuel pressure spec. KoEo is 60-66psi. The vehicle came in... Trouble codes: P0300
2006 GMC Sierra 2500 HD WT 6.6L None
Hey IATN guys. Thankfully I don't think I have a problem. I have a question for the Duramax guys. I personally own an'06 truck with an LBZ engine which I got new. I know there were some problems with the LLY glow plugs breaking in the heads. The LBZ has glowpl...
2007 GMC Sierra 1500 SLT 5.3L Poor Idle Quality VIN: 2GTEK13M17
Hi everyone . Just replaced a throttle body on this GMC and now it will not return to idle properly - after i clear the system it will start and idle down -relearn is to run for 3 minutes and off for 1 min. - the second time i start it it will go to 1200 rpm a... Trouble codes: P0121
1994 Oldsmobile 88 Royale 3.8L abs lamp, cruise control VIN: 1G3HN52L9R
This one is kicking my butt, and i need some help. This thing came in with the complaint of no cruise control. I found the code of P1562- cruise vaccume solinoid, Also the cruise control would not work. So I followed the flow charts provided from Mitchell and ...
2001 Pontiac Grand Am SE 3.4L engine noise/dies out VIN: 1G2NF1ZE21
This vehicle runs fine but after it gets warm it starts to sound like a deisel and knocks as well as lifters clattering inside. The engine surges and the noise comes and goes as the RPM drop and rise. The oil pressure was reading about 25psi to 30psi at idle w...
2005 Pontiac Montana SV6 3.5L Cuts out, Misfire VIN: 1GMDV23165
Hi everyone, the customer has had a issue with this van all winter, she has taken it to the dealer on 3 separate occations after it has stopped on her and would not start. Each time the dealer has called her and told her nothing was wrong with the van. I have ...
2002 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R52
Hi all, car came in with intermittent stall no start. Let car run sure enough it stalled. Found all 3 codes listed, and no signal from crank sensor when hot. R&R crank sensor. Let run and test drive seems ok. Cleared codes and P0050 and P1780 come back right a... Trouble codes: P1780 (PNP Switch/Mil request by TCM), P0335 (CKP Sensor A Circuit), P0050 (HO2S Heater B2S1)

Fixes & Summaries for GM
Fix/Summary Answers
1984 Chevrolet El Camino Conquista 5.0L blower motor VIN: 1GCCW80H5E
Thanks for all of the help. Several of you nailed it. The problem was the connector near the right valve cover. It had a burned connection inside. I soldered the wire together bypassing the connector (it is a large red wire coming from the alternator). no...
1996 Chevrolet S10 2.2L Stall VIN: 1GCCS14477
Thanks to all that replied and helped. I replaced the ignition switch and the truck is gone. What is amazing is the lack of usefull information on Mitchel 1. I don't know if Aldata is any better, but if their salesman calls again and offers a "test drive" I'll... Trouble codes: P0141 (HO2 Curcuit fault).
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Surge VIN: 1G1JC1242V
Thanks for all the sugestions, as stated in my update, found plenum gasket broken/missing. Also found head gasket blown between 2 and 3 cylinders. Replace head gasket and resealed manifold. Runs fine now, compression test okay, even used old map sensor! Thank...
2001 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Stall VIN: 2GCEC19V31
thanks for all the great replies.did extensive throttle body cleaning,cleaned maf,tried relearn procedure,did gain about a 100 rpm gain in idle.customer said he needs his truck back for work and he will live with it the way it is.the replys were excellent and ...
2001 Chevrolet Suburban 1500 LT 5.3L SRS module VIN: 3GNFK16T21
You know those jobs where you dread having to explain what you found out...this is one of those! After spending almost as much time explaining as i did fixing the customer is satisfied with the outcome. That being the truck is now running fine, no more "U" cod...
2004 Chevrolet Silverado 3500 6.0L Misfire, MIL Lamp on VIN: 1GBJC39U24
Hello all! I did fix this vehicle. I pulled both fuel rails and all 8 injectors. #7 was totally clogged with a gummy varnish looking gunk,also traces of this gunk in all the injector screens. I cleaned 7 of the injectors and replace the # 7 injector. Drained t... Trouble codes: P0302, P0307.
2009 Chevrolet Impala LT 3.5L Housing VIN: 2G1WB57K39
Well, folks it is done, but not the neat way. Two respondents suggested an impact wrench, one suggested a salvage yard unit...but Michael instructed me to turn the nut counter to the arrow on the fan until the three slots lined up, and the fan would come off. ...
1997 GMC K2500 Sierra SL 5.7L abs module VIN: 1GTGK24R2V
The ABS was not the problem. Leaking wheel cylinders were causing contamination on the pads resulting in slight brake bias toward the rear brakes. The ABS would activate because the rear brakes were appling more than the front. The customer declined our sugges...
2000 GMC Savana 1500 5.7L Hard start VIN: 1GDFG15R7Y
We did not find a screen or plugged distributor it had a offset stepped hole no screen at all. We did not find a bad distributoe drive gear all looked good. replaced with Delco cap & rotor and we drove for several days and let it sit problem did not come back....
2004 GMC Sierra 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTEK14T74
Well, I finally got the ok to replace the intake manifold and I can say that it idles better, though not perfect. After replacing the manifold with a Dorman unit the idle smoothed out some and the cyl 5 misfire counts all but went away but the cyl 6 misfire co... Trouble codes: P0300 (Misfire).
2004 GMC Sierra 1500 SLT 5.3L power steering pump VIN: 2GTEK13T34
Thanks for all the help.I should have stated that it was a new gm pump that was installed.Also the system was flushed at the gm dealer.We had to replace the pump again as well as the high pressure line because even when the line was flushed it looked to still...
2004 Oldsmobile Alero GL 3.4L HVAC control VIN: 1G3NL52E64
it's fixxed! swapped out the after market ignition switch for a factory one. also, before i installed the new switch, i phoned the local GM dealer and spoke to the lead tech. he said he has seen this condition before and that before you preform the Passlock r...
1991 Pontiac Firebird 3.1L Ignition VIN: 1G2FS23T7M
Thanks to all who replied. Chris from California had the best test. It was the VATS module that was bad. I replaced the module with a used one and put a resistor for that module in line. The Firechiken started right up. Very much appreciated.
2004 Saturn Vue 2.2L Cuts out VIN: 5GZCZ23D14
I found the C2 connector at the ECM has a loose connection somewhere. If i wiggle the wires at the connector ever so slightly I can get the vehicle to act up. The ECM loses power and that sends a flurry of other things shutting down. I believe the main engine ... Trouble codes: P0303 (3 Misfire).
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