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Prev Professional Automotive Repair Technical Discussions for September 30, 2009
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Open Help Requests for GM
Help Request Answers
2005 Buick LaCrosse CXL 3.8L Engine/Transmission VIN: 2G4WD532X5
We have this Buick with an intermittant rattle type noise that appears to be coming from the bellhousing area. Of course it makes the noise very little while in the shop on the lift but will make it a lot while driving down the road. When the customer first br...
2000 Cadillac Catera 3.0L MIL Lamp on, P0411 VIN: W06VR54R2Y
fixed two leaks on injection system p0411 still returns. the pump runs the vac. solenoid for by pass valve opens the valve its self will open. i have to do this manually as there are no bi directional controls for this vehicle with the snap on solis pro. using... Trouble codes: P0411 (sec. air injection incorrect flow)
2003 Cadillac CTS 3.2L steering angle sensor VIN: 1G6DM57NY3
hi everyone, thanks for your help in advance, i have a 2003 cadillac cts, which has a porblem in the vses/abs traction systems, every now and then the abs light will light and the service stability message will come up, and code c1287 will set indicating an is...
2003 Cadillac Seville STS 4.6L oil pressure VIN: 1G6KY54993
Ok, so I am on my way to work yesterday morning and I am right around the corner from the shop. I'm at a traffic light and have just taken off from a stop and the oil pressure light/warning chimes saying oil pressure low - stop engine. Then it goes away. As I ...
2006 Cadillac STS 3.6L starting and dash componates VIN: 1G6W677160
help out there fellow cadillac techs, i have the 2006 sts that is driving me crazy. it does not want to starting whenvever it feels like it. i looked at the past history, and it has had everything from batterys replaced to wiring to the transmission fixed. so ...
1987 Chevrolet Corvette 5.7L Poor Idle Quality, Cuts out VIN: 1G1YY3185H
car came to me with rough idle and miss under light load.Checked vac, it checked good and steady. Ran fuel volumn test, it was low (less than a pint in 30 seconds)R & R fuel pump, but still has same symptoms. My master tech will not do an injector balance test...
1992 Chevrolet C1500 WT 5.0L Poor Idle Quality, Stall, MIL Lamp on
i have been fighting with this thing for a few days and it is frustrating me now. customer complains about long cranking and once it goes it stalls or poor idle all while cold.i could not get it to act up on me other than rough idle for about a minute and a ha... Trouble codes: 33 (map sensor high voltage reading)
1996 Chevrolet C1500 Silverado 5.7L No Start VIN: 2GCEC19R5T
Still no start no injector pulse and no fire from coil scanner shows cranking rpm but no injector pulse width
1998 Chevrolet C1500 Silverado 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge VIN: 1GCEC14W9W
1998 Chevrolet Astro 4.3L speedometer VIN: 1GNDM19W8W
Hello Everyone. I have this Astro van with an inop. speedo. There are no DTC's and the data stream is showing MPH. The cluster was removed and tested by Instrument Sales and Service here in Phoenix (these guys are a great outfit) and was told the cluster is go...
2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Hesitation, Misfire VIN: 2GCEC19TXY
When The truck is started up it has a missfire cyl number 4, it also has an extened crank. When the key is released and restarted it fires up, but has a rough idle. When the gas is depressed the miss will go away. I also pulled the number 4 plug to find that i...
2001 Chevrolet Silverado 3500 6.6L Surge, LOSS OF POWER VIN: 1GCJK33121
this vehicle always loses power pulling trailer uphill only. vehicle does not show excessive fuel oil fuel hoses visually ok vacuum gauge idle less than 2" at cruise 3-4" fuel pressure actual and desired are ok - when taking vacuum reading from suction side o... Trouble codes: P0093 (large fuel leak)
2001 Chevrolet S10 LS 4.3L Misfire, MIL Lamp on, misfire 1&4 cyl p300 VIN: 1GCCS19W61
truck was towed in with blown engine,replaced with low mile used engine.resealed and tuned.ran great after replacement was completed.truck returned 2weeks later for fuel level sensor repair.thats when we found the misfire complaint from customer, high... Trouble codes: P0300, P0304
2001 Chevrolet Cavalier LS 2.4L Surge VIN: 1G1JF52T01
Hi everyone, This one car has got me and another tech stumped. The car came to me with a blown engine(coolant in oil, and knocking). I put in a used engine from another 2001 sunfire gt(vin t as well). When the car came to me, it ran okay, no surging. Ever sinc... Trouble codes: C1275
2002 Chevrolet Tracker 2.0L compressor VIN: 2CNBJ13C92
This suzuki came in with a low charge and a noisy compressor which would not turn off even with no low side pressure.I checked the diagram and found there is no low side switch only a hi side switch,a temp sensor on the evaporator, and a compressor clutch cont...
2004 Chevrolet Silverado 2500 6.0L valves VIN: 1GCGK23U44
hi gm guys. i need to know what you think might have bent two intake valves on this 04 2500 6.0 silverado. customer said he ran out of gas and added some from a can possibly contaminated with water. no piston damage apparent. cyls look ok. had some rubbery bui...
1995 GMC Sonoma SLE 4.3L abs lamp VIN: 1GTDT14Z4S
Customer complaint about brake lamp coming on, had service performed for ABS lamp complaint from other facility, friend of a friend (oh boy here we go). They sold him a front brake job and told him he was all set. I get this vehicle and found they had removed ...
1998 GMC K1500 Sierra SL 4.3L power steering pump VIN: 1GTEK19W0W
Tested customer installed p/s pump, no pressure. Replaced p/s pump, cleared codes, test drove, worked briefly then same problem came back, pump started making noise like low on fluid and no power assist, fluid gets hot and boils out the resevior. We performed ...
1997 Oldsmobile Cutlass Supreme SL 3.1L anti theft VIN: 1G3WH52M5V
first of all, thank's to all of you that bother to read my message, i have this 1997 oldsmobile cutlass supreme, with the security light indicator always on, found bad ignition lock cylinder cables at lock cylinder, replaced cylinder, but light is still on, th...
1991 Pontiac Sunbird LE 2.0L Excessive Emissions, Poor Idle Quality VIN: 1G2JC14K0M
Greetings: Vehicle failed CA ASM test for elevated NOX at 15/50 portion of test. Monitored O2 when performing baseline- no symetry and very jaggeded. Observed 12 in vacuum to egr while testing. Timing at 10 degrees. Alldata gave wrong info as to what type of e...
2000 Pontiac Grand Prix GT 3.8L factory alarm VIN: 1G2WP52K9Y
Customer stated that the "Security" light was flashing, and at one point would start and die. He disconnected the battery and the vehicle started, but the light was flashing still. He drove another couple of days and the same thing happened--no start. He disco...
2003 Saturn Vue 3.0L fuel gauge VIN: 5GZCZ53B13
gas gauge not registering correctly 1/4 tank no matter what .. fuses good -check with modis fuel level is [...],volts 1.85 on scan data resistance on primary sender is 67.2 ohms and secondary sender 78.3 5 volts at purple wire-- good ground verified shorted...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet C3500 Cheyenne 6.5L smoke out of dipstick tube VIN: 1GCGC39F5P
We cleaned the can on top of the passenger valve cover and the smoke was much better. We replaced it and it was almost all gone. Thank ya'll for ya'lls help.
2001 Chevrolet Suburban 1500 5.3L no 2nd gear VIN: 3GNFK16T41
thanks for all the help. Its looks like interal trans. problem. Customer wants to trade for new truck.Thanks again for all the help,this my first time asking for help and I got to say WOW! it feels good to know there is that much help out there. keith.
2001 Chevrolet Silverado 2500 HD 6.0L Misfire, MIL Lamp on VIN: 1GCHK23U21
Most replies suggested egr:totally plugged off egr,plugged all 4 vacuum ports,changed intake,compared injector and coil pulse width w/good cylinders,removed and bench tested/compared injector flow to a new one,tested compression running and cranking,physically... Trouble codes: P0300 (engine missfire detected).
2002 Chevrolet Trailblazer LT 4.2L Electronic VIN: 1GNDS13S62
control unit was bad it had and intermiten conection problem
2003 Chevrolet Silverado 2500 HD 6.6L abs VIN: 1GCHK23143
After going back and rechecking everything my techs had already done. I found that with the vehicle off the ground and on the lift I could erase the C0040 code and it would not come back. We could set the vehicle down and start to drive it and the code would i...
2002 GMC Envoy SLT 4.2L power window VIN: 1GKDT13SX2
thaks to all for help. it was broken wires in the door jamb loom. repaired all the wires, and it is good now. thanks again for all your help
2004 GMC Sierra 2500 HD SLT 6.6L No Start VIN: 1GCHK29244
well after waiting on the insurance company to approve the claim on this truck we proceeded with checking return flow from the injectors. We had just a trickle but that was enough not to get the pressure we needed. It seem as though these pumps are a high pr...
1998 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C4W
Car is repaired. It was not stated in original reply, but both crank sensors had been replaced and fire and fuel pulse were available- I would not have made the request otherwise. The problem was the fuel pressure regulator. There are two types of fuel rails (... Trouble codes: P1599.
2001 Pontiac Aztek 3.4L No Start, Poor Idle Quality, Cuts out VIN: 3G7DA03E51
Thanks to every one who replied. This one was ended up being a simple fix. I had one of the new shop helpers put the t-body on for me. When he installed it he didn't look at the gaskets, the gasket for the t-body that came with kit did not have the iac port... Trouble codes: P1189 (engine oil pressure circuit).
2005 Pontiac G6 3.5L VIN: 1G2ZG52815
First, thanks for all the help. This vehicle had overlaping problems. The windows problem was a broken dedicated ground in drivers door. The no communication, was more interesting. While finding the ground to door windows, located behind left front kick panel,...
2006 Saturn Ion Red Line 2.0L Mechanical VIN: 1G8AY11T86
thanks for everyone input we managed to fix this one ,,ordered another slave cylinder from the dealer and all is well ...thanks you again
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