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Prev Professional Automotive Repair Technical Discussions for May 1, 2013
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1987 Buick Electra Park Avenue 3.8L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G4CW5134H
changed 5 MAF sensors and 1 ecm vehicle idles @approx.1000 rpm and runs rough @ cruise.all sensors reflect running condition of a lean system;block learn=130-138,vac guage reads 18-19 inches @idle,tps=.65@idle and doesnt drop out with increased throttle pressu...
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1998 Cadillac DeVille 4.6L Ac VIN: 1G6KD54Y2W
At times the AC vents will blow out of the defrost vents. This happens on start up and will continue until the vehicle is shut off. It does not happen often. Also when we pulled it inside for the night we noticed the blower motor running even with the keys out...
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1997 Chevrolet Express 2500 LS 5.0L Unknown VIN: 1GCFG25M0V
fuel pump is on constantly upon key turned to ignition and never stops No spark or injectors operating Scan tool does not see the ecm. If i replace the ecm with a used one of the same year and engine size will she run??? or do i have to reflash/reprogram??? ...
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2002 Chevrolet Silverado 1500 4.8L exterior lighting VIN: 2GCEC19V82
Truck came in for poor running,found low fuel pressure 30psi.Pump was just changed by customer.Then found that truck has electrical issues.When engine running hit brake pedal it quits.Exterior lighting{running lamps} go out when brakes applied and no brake lig...
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2004 Chevrolet Silverado 1500 4.3L Engine VIN: 1GCEC14X24
Stall happens after running for random periods of time, and will always restart with no hesitation regaurdless of temp. I've looked at the connections at the distributor as well as the connections at the coil, since these are common failures, these are good. A...
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2005 Chevrolet Colorado Z85 LS 2.8L Starter VIN: 1GCDT19875
Hi guys - first time post for help - have a truck with a starting issue - towed in - found ignition switch binding ,so replaced with dealer parts , did passlock relearn and now i have a starting issue that is puzzling - i can crank the truck and it will give m...
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2006 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AK15FX6
Hi Techs, Have this cobalt that came to me for state emission test and found codes PO411 and P2440 stored in PCM. After a quick look, I found the air pump was seized and would run a little if you tapped on it and also found AIR injectio control solenoid rusted... Trouble codes: P0411
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2007 Chevrolet Silverado 2500 HD Classic LS 6.6L MIL Lamp on, Limp Mode VIN: 1GCHK23D87
This truck throws a P0087 code and goes into limp mode, restricted to 40 MPH when the customer is hauling heavy loads in hot weather only. All winter long it was fine, it only fails on 75+ days after miles of driving. Balancing rates are Cyl 1 -3.2, Cyl 2 +1.3... Trouble codes: P0087 (Fuel Rail/System Pressure Too Low), P0401 (EGR Flow Insufficient Detected)
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1999 GMC W4500 Forward W4S042 5.7L No Start VIN: 4KDC4B1R3X
This truck was towed to the shop for no start, or at times very extended crank to start. When it arrived I checked for fuel pressure and spark. Also noted that the starter had a bad spot in it and would kick out while starting, so I replaced that before going ...
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2004 GMC Sierra 1500 SLE 5.3L driveshaft VIN: 1GTEK19T34
we have this 4x4 gmc that under just the right load and road speed-(38-40 mph) in 2 wheel drive there is a noise and vibration coming from the rear end of the vehicle. it feels like it has the harmonics of driveshaft speed. we pulled the truck on the lift but ...
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2003 Pontiac Bonneville SE 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G2HX52K43
Hey everyone, got another one for you all to ponder over. The customer called and said his check engine light came on the other day 3 weeks after I fixed his MAF problem. When he dropped it I noticed that it idled really rough when I started it and kind of cam... Trouble codes: P0171 (HO2S lean bank 1)
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1997 Saturn SL1 1.9L No Start VIN: 1G8ZH5287V
Both pcm fuses blown -- pcm b pops as soon as its instaslled & pcm 1 pops when cranked/key on -- unplug pcm & fuses are ok -- pretty much tells me pcm is toast -- my question is about pcm programming. The local parts store can flash pcm before delivery. Is the...
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2003 Saturn Vue 2.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 5GZCZ43D53
On cold start fires right up and runs good, just that idles to high and races to over 3,000 rpm runs good for about 30 to 40 seconds and then service engine soon and power loss lights come on at same time. Then it runs very rough no misfire codes, plugs, coil ... Trouble codes: P1514 (Airflow to tp sensor correlation high)
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Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Rendezvous CXL 3.4L gauge VIN: 3G5DA03E05
vehicle is fixed.the gauge going up is normal operation.After more drilling customer for info,they said they had the a/c on but it got too cold so they shut off a/c but not the engine and shortly after that is when it heated up on gauge.thanks for all the inp...
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2004 Cadillac DeVille 4.6L windows VIN: 1G6KD54Y94
I finaly fix the 04 cadi, it was 3 wires pinched in behind the door stop hinge on the the divers door, and it happen be the 2 wires going to the pass front door, cust said the door had never been repaired befor,m but i find it hard to believe it came from the ...
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2003 Chevrolet Express 3500 6.0L No Start VIN: 1GCHG39U83
We replaced the lock cylinder and housing. Performed a relearn and all is well so far. Thanks all for your help!
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2005 Chevrolet Silverado 2500 HD 6.0L power steering VIN: 1GCHK29U55
To start, thank you all again for your replies. Got that pump changed out with an OE unit, bled per the manual, and all is nice and quiet. The customer is happy and willing to change out that wimpy P/S cooler sooner than later (ie, before winter comes 'round...
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2006 Chevrolet Silverado 2500 HD LT 6.6L Tcm VIN: 1GCHK23D66
I GUESS THE MORAL TO THE STORY IS EVEN THOUGH IT IS NEW AC DELCO DOESN'T MEAN IT IS ALWAYS GOOD. A NEW TCM FIXED THE TRUCK.I LEARNED ALOT ABOUT THE BUS SYSTEM...APPARENTLY THE CAN BUSS HAS TO CHECK OUT OK BEFORE IT WILL SHOW PCM AND TCM ON THE CLASS 2 DATA BUS...
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2008 GMC Yukon Denali 6.2L Hesitation, Surge VIN: 1GKFK63858
Ok so the fix for this vehicle is their is definatly supost to be 12 volts on that wire when truck is running. After doing some more test, found that the wire was rubbing on front drive shaft. everytime the front drive shaft would turn it would pull the voltag... Trouble codes: P0230.
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2000 Saturn LS2 3.0L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G8JW52R2Y
SO I WAS GOING TO DO THE INTAKE MANIFOLD GASKETS, DECIDED TO DO A CYLINDER LEAK TEST AND FOUND OUT THAT CYLINDER NUMBER 3 ON THE BACK HAD NO COMPRESSION AT ALL AND THE OTHER TWO ON THE BACK HAD LIKE 30 PSI. WHEN I WAS DOING A COMPRESSION TEST BEFORE I ONLY DID... Trouble codes: P0056 (Heater oxygen sensor bank 2 sensor 2).
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