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Prev Professional Automotive Repair Technical Discussions for September 11, 2007
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Open Help Requests for GM
Help Request Answers
2002 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP54KX2
Car came in with severe lack of power and codes p0171 lean, and p0131 O2 sensor voltage low. Found severe dirt on MAF wire and very dirty air filter. Changed air and fuel filters and cleaned MAF wire. Car now has plenty of power, so I clear codes and let it go... Trouble codes: P0171, P0131
1998 Cadillac DeVille 4.6L A/C clutch VIN: 1G6KD54Y4W
Anyone seen problems with A/C intermittently cooling on these cars?? Briefly cools but mostly does not. Clutch cycles on and off, but mostly off. I checked the electrical part of the circuit and found a bad clutch diode, so I replaced it, but now the new diode...
1987 Chevrolet Cavalier RS 2.8L Hesitation, Cuts out VIN: 1G1JE31W7H
this is a speed density upgrade, this vehicle stumbles or cuts out when appling less than a 1/4 throttle. runs great on hard accell or cruise speeds. we ohmed the injectors, checked tps, map, and maf, no vacuum leaks, no intake leaks. im starting to lean towar...
1989 Chevrolet C1500 Cheyenne 5.0L Poor Idle Quality, Surge VIN: 1GCDC14H1K
I need help please I have this 89 chevy that acts like it is not getting enough fuel but other times it runs great fuel pressure is of the spray pattern looks ok the coolant sensor has been replaced (not by me) and seems to be reading ok , the tp sensor looks ...
1989 Chevrolet Camaro Iroc-Z 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1FP21E7K
This vehicle came into my shop running very rough and idling high. Customer stated that a performance shop installed an LT1 engine with an LT4 camshaft. Horrible butchers!! Customer stated that the pcm is factory and that the performance shop said it was runni... Trouble codes: 26 (Quad Driver 1 fault), 43 (ESC Module or circuit fault)
1990 Chevrolet K1500 Cheyenne 5.7L Hesitation, Cuts out, Stall, backfire at t-body VIN: 1GCDK14KLE
Hello all, This 1990 chevy k1500 will run great 99% of the time. Customers concern is when giving gas, stalls. I was able to duplicate this for about 10 minutes. If you step on the gas it really bogs, and stalls. In the shop if I snapped the throttle kept it ...
1992 Chevrolet S10 Blazer 4.3L No Start, Cuts out, Stall VIN: 1GCCT13W5N
this one is putting me back to eating hot dogs. 1992 blazer 4.3w. it has been everywhere and now it is here. a dealer replaced the pick up coil, ignition module, ecm, harness to cpi unit and the coil. at first when i got the vehicle it just wouldn't start. so ...
1993 Chevrolet Lumina APV 3.8L Hesitation, Surge, Cuts out VIN: 1GNDU06L0P
hi this van has problem when it run for 15 minut it make very black smoke the tail &the engine stall when you trun it over it trun but dosnot start when it gets very coold &you start it sometime it start sometime it dosnot&i check fuel presure it ok,i have pul... Trouble codes: 14 (coolent sensor)
1996 Chevrolet C1500 Cheyenne 5.7L Misfire VIN: 2GCEC19R3T
The reason I replaced some of these components is this. Crank sensor tested bad with ohm meter, fuel pump would not hold pressure without pinching return line, spark plugs were corroded shut, plug wires were burned, and fuel pressure regulator was plugged at v... Trouble codes: P0300 (Misfire detected)
1998 Chevrolet S10 LS 2.2L Starting VIN: 1GCCS1947W
Hey there guys, I have this S-10 that came in for a grinding noise. The customer had replaced the starter himself and used a "Auto chain" not reputable for dealing with shops- if you know what I mean... Anyway, this is a intermittent problem. What seems to hap...
1998 Chevrolet Malibu 3.1L ac compressor VIN: 1G1ND52TXW
thanks in advance guysthis malibu came in no ac compressor did not run put guages on plenty of pressure no power at compressor scan tool shows ac demand says no switch on dash sometimes blinks pwer at compressor relay jump relay still no pwer at ac comp pulled...
1998 Chevrolet Malibu 2.4L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1G1ND52T3W
Hello all, I need your expertise! This Malibu came to us after work done at another shop. Owner said that car was missing and so took car to another shop (while in a different city) plugs, coil tower, plug boot kits and coils replaced. Owner said that other s... Trouble codes: P0172 (Fuel Trim System Rich)
2002 Chevrolet Monte Carlo LS 3.4L a.c. blower VIN: 2G1WW12E32
This car is my wife's car so you know i am need help badly any information i can get is much appriciated.The blower motor will not work sometimes it will work only when it wants to I changed resistor and blower motor I am thinking it might be ignition switch b...
2004 Chevrolet Cavalier 2.2L Hesitation VIN: 1G1JC52F64
I have this 2004 Cavy that is causing major problems. It is terrible throttle response both in park and going down the road. Once the RPMs Get to 3000 it takes off and does just fine. The car came in 27000 miles OVER DUE on an oil change. We then put plugs and...
2004 Chevrolet Silverado 1500 4.3L guages VIN: 1GCEK14X74
Hey guys, Im a Ford guy mostly but one of our fleet customers has this one Chevy truck that none of the guages work. The tachometer and speedometer both work and the digital mileage/information center works, but none of the 4 guages on the right, volt meter, o...
2006 Chevrolet Aveo LS 1.6L ABS light VIN: KL1TD56606
I have an ABS light comming on intermittently and also get a peddle vibration at a lower speed stop as if a wheel is locking up and the ABS pump applies. The Snap on scanner (Solus) will not comunicate with the ABS system. Can not get codes. Light comes on and...
1995 Oldsmobile Aurora 4.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1G3GR62COS
I am ready to burn this car, and can see why it was sent to auction previously! First it's a 1995 and uses an OBDII diag connector, but has non OBDII codes and I'm told it is OBDI. :? AFter replacing the ECM, it has not reset any of the previous codes, but i... Trouble codes: 80 (TPS Idle learn procedure incomplete)
1995 Pontiac Bonneville SE 3.8L Steering VIN: 1G2HZ52145
very low power assiste in steering, car came in and rack was leaking, replaced and did not improve, then replaced power steering pump, still no help, by passed presure valve in pump and still no help, only time seems a little better is when rmp are raised a lo...
2000 Pontiac Firebird Formula 5.7L check gages VIN: 2G2FV22GXY
fuel gage reads empty at all times check gages light on and service engine also no a/c car seems to run fine shifts kind of funny scaned p1639 code 5 volt trigger lost
2002 Saturn Vue 3.0L Hesitation, Misfire, MIL Lamp on VIN: 5GZCZ63B92
I am losing the battle so far with this Saturn Vue! First time in it had misfires on many cylinders, both banks, ran o.k., but I could feel a miss at idle occasionally. With all the miles I opted to replace plugs and do a compression check. While the plugs wer... Trouble codes: P0300, P0301, P0303, P0304, P0332, P0343

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet Cavalier RS 3.1L Excessive Emissions, Poor Idle Quality, Stall VIN: 1G1JC34T3R
Thank you all for your replies. We fixed the car today - Thank you David [...] - Right on the button. The stall at idle and poor accel was caused by a soft and cracked vacuum hose that was tee'd into the MAP sensor line. (interestingly it never showed up ...
1996 Chevrolet K2500 Suburban 5.7L lean VIN: 3GNGK26R6T
after consulting with other techs and high performance enthusiasts, and all you guys help I have concluded that this is a normal condition. because they are cheap headers and are very thin. also sinse it will not happen under a load or driving.
1999 Chevrolet Silverado 2500 6.0L No Power !!!! VIN: 1GCGK29UXX
Checked battery cables, all is well there. Replaced battery with a Delco. Unit has not acted up since. I still think it will act up again when the weather changes, but for now its fixed. Thanks for all the quick replies. IATN Rocks!!!
1999 Chevrolet C1500 LS 5.7L Low Beams VIN: 1GCEC19R5X
Well, the best and "safest" fix was to replace the entire multifunction switch assembly (it comes with the affected wiring sub-harness). The only problem I encountered was the first switch was boxed wrong. The circuit for the brake lights was wired to ground...
2001 Chevrolet Monte Carlo LS 3.4L ac alternator radio VIN: 2G1WW12E51
got a dealer bcm had dealer program it, all syptoms are cured. thanks to will from ohio, philip from illinois, david from texas,and david from indiana.I checked power and grounds for volatage drops then got the bcm. thanks you guys helped a lot . nailed it ...
2001 Chevrolet Express 1500 4.3L Hesitation VIN: 1GCFG15W41
this reply is a bit late, but after testing the tps with a labscope and not seeing any glitches, the code would still set intermittantly. replaced tps and problem gone, i guess my LS 2000 isnt fast enough... Thanks to all who replied for your assistance..
2002 Chevrolet Cavalier 2.2L Surge VIN: 1G1JC52482
Thank you all gentlemen, the cavilier is fixed with your help. I work alone so I sometimes need other ideas when I get stuck. The TPS shares 5 volt reference with the fuel tank pressure sensor and the AC pressure sensor. I dont know why, but I never considere... Trouble codes: P122.
2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Poor Fuel Economy, NO POWER,BOGS VIN: 1GNDS13524
Thanks for all the replies. We ended up having to remove the intake to access the fuel rail and injectors for cleaning. The normal 3 part injector service did not clean it out.
2007 Chevrolet Silverado 1500 Classic LS 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 3GCEC14XX7
Well, I received some good responses and tried alot of things, but the fix for this one turned out to be internal engine repair. The # 2 cylinder had a bent exhaust valve. I cannot find the cause of this, and would never have thought of an internal problem wit... Trouble codes: 300 (random/multiple misfire).
1992 Geo Tracker 1.6L No Start VIN: 2CNBJ18U5N
Hey, guys are great. The problem was the ECM power output to the injector. I followed some suggested advice and took alternate power from the ignition powered alternator wire. Told the customer this was not the "proper" fix (that being a new ECM, but...
1995 GMC Yukon 5.7L abs VIN: 1GKEE13K4S
Thanks for all the help, this has been a real nightmare! turned out to be a bad abs control valve assembly, which was already was replaced with a GM parts. I wanted to make sure the cust. was happy before I closed it. Thanks again for all the good replies!
1994 Pontiac Bonneville SE 3.8L Air flow VIN: 1G2HZ52L1R
Well, the customer decided not to put any more money into the vehicle. I had a few guys tell me to check the programmer and a couple of guys said to check the vacuum. Unfortunely, we will never know. Thanks for all the replies.
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