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Prev Professional Automotive Repair Technical Discussions for February 7, 2011
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Open Help Requests for GM
Help Request Answers
1991 Buick Regal Custom 3.1L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G4WB14T8M
Hello all! We had this vehicle towed to us. The customer says he was driving it one day and all of a sudden the vehicle died. Tried to restart and now its having problems. The car starts up fine but idles terrible. As soon as you try to give it throttle it die...
2005 Cadillac CTS 3.6L Mechanical VIN: 1G6DP56735
Hey guys, really frustrated with Mitchel-1 right now. No info on camshaft variable timing chain set-up. We are trying to reassemble the timing chain on the right side. My tech put marks on the camshaft wheels before dis-assembly, but we don't know if the chain...
2007 Cadillac Escalade 6.2L Mechanical VIN: 1GYFK63837
oil pressure light is coming on intermittently. Replaced sensor. Seemed ok for awhile. Came back with light coming on. When oil pressure light comes on scanner does read low oil pressure. Down as far as 2psi. Shut car of oil pressure at about 40psi the slowly ...
1994 Chevrolet K2500 5.7L Hesitation, Surge VIN: 1GCGK24K0R
You get a slight bogging down at about 45-50 mph only after driven for 15 - 20 miles here in our 20-30 degree weather. Then its very intermittent. Its a farm truck and customer says it happens all the time and its done it for 6 months. It must be worse in Summ...
1997 Chevrolet S10 LS 4.3L No Start, Flooding VIN: 1GCCS19X7V
Got 1 I cant figure this vehicle came to me after the customer replaced half of everything to figure out a P0300.The vehicle came to me as a no start.I was told he replaced the fuel pump,fuel filter,ignition complete cap rotor wires plugs.Saw A new ignition co... Trouble codes: P0300
2002 Chevrolet Tahoe LT 5.3L reverse VIN: 1GNEK13T42
Grinding noise in reverse, sounds like your putting it into park while moving. Customer says they were shifting from drive to reverse, while stopped, when the problem happened. I notice that if the Tahoe is NOT moving (on the ground) you put it into revers...
2002 Chevrolet Suburban 1500 LS 5.3L Misfire VIN: 1GNEC16T22
hi i need help wt this one, the truck had the ck engine lith on wt po300, since have over 100,000 miles we d the wires and plugs, but still misfire on driver side of the engine cilynder 1,3,5,7 all the coils are good the ingectors puls is good. if some one see... Trouble codes: P0300
2004 Chevrolet Silverado 3500 6.6L Misfire VIN: 1GBJC34224
I have a duramax with a p1223 that i can't seem to get a definitive diag.replaced #1 injector-old one did not fire most of the time-and was good for about a code has returned.have a hard time blaming injector as it was a new g.m. Unit.any and all hel... Trouble codes: P1223 (1 injector output circuit)
2005 Chevrolet Impala 3.8L Poor Idle Quality, MIL Lamp on VIN: 2G1WH52K85
hey fellow techs, Got this brain teaser here. car came in with customer complaining of poor idle quality. Excellerates fine but at idle vehicle misfires from random cylinders.Vacuum at idle jumps between 17.5 to 16 psi. Misfire tends to be random but when i lo... Trouble codes: P0300
1996 GMC K2500 Sierra SL 5.7L Tcc VIN: 1GTGK29R9T
At 50-55 mph only in 3rd or 4th gear tcc solenoids are cycling on and off. This is cuasing a rpm "surge". Unhooked the egr and evap sol with no change. New tps installed. All input and output speeds steady on graphing scanner. It appears that the ecm is turnin...
2005 GMC Sierra 3500 6.6L MIL Lamp on VIN: 1GTJK33255
Checked four glow plugs checked ok, truck starts good even in temp. around 20 deg. after sitting all night. Replaced glow plug controller started about 10 times and reset codes all eight glow plug circuits, still starts fine. Thanks for any help. Trouble codes: P0671, P0672, P0673, P0674, P0675, P0676
2007 Pontiac G6 GTP 3.6L Misfire, MIL Lamp on VIN: 1G2ZM58767
Thanks for your time. This this has got a miss on cylinders 1 3 and 6. swaped coils around no change swaped fuel injectors with no luck pulled both cats and no change good compretion on all cylinders. injector spay pattern good, coils are snapping hard. the th... Trouble codes: P0300, P0306, P0301, P0303
1999 Saturn SL2 1.9L Stall VIN: 1G8ZK5270X
Car runs fine when cold. After getting to operating temperature the car bucks when accelerating and wants to stall when coming to a complete stop.also hesitates when taking off from a trouble codes and firing order is definitely correct.
2002 Saturn Vue 2.2L Misfire, MIL Lamp on VIN: 5GZCZ23D52
This vehicle first came to us with a noise in the engine that we determined was lifter noise. It was overdue for an oil change so we changed the oil & added an oil additive to help with the lifter noise. (lucas oil treatment)3 days later the customer calls us ... Trouble codes: P304

Fixes & Summaries for GM
Fix/Summary Answers
2003 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 17E3146310
Well i guess its fixed. had a wire going to the pcm rubbing through a harness against a bracket. Thanks for the info! Trouble codes: P0380.
2003 Chevrolet Trailblazer LT 4.2L all gears VIN: 1GNDT13S83
I hate going the wrong way trying to repair something... Most all of the replies said it was the trans. filter clogged. It was plugged with what looked like metallic silt. I can't believe that would stop it from pulling and have those symptoms but it did. T...
2011 Chevrolet express 3500 6.0L rear blower motor VIN: 1GAZGZFG6B
Thank you to all four techs that replied. Boris [...] hit the nail on the head saying I had a short in circuit #1924. I followed the wiring harness all the way from the rear of the van to the front and didn't find anything, but I did notice an aftermarket br...
1998 GMC K2500 Sierra SL 7.4L No Start, Stall VIN: 1GTKGK29J9
Well I have replaced fuel filter 2 weeks ago and have not encountered problem since. Sometime we overlook the simple things. thanks all who replied
1999 GMC Safari SLE 4.3L Poor Idle Quality, Hesitation, Stall VIN: 1GKEL19WXX
Well Heres one you dont see to often.After exhausting all efforts to correctly diagnose this van,we decided to go back to square 1. we took off the intake and checked the problems with gaskets,But. When we lifted the intake off the engine a funny ra... Trouble codes: P0301.
2000 GMC Yukon SLE 5.3L Unknown VIN: 1GKEK13T2Y
Thankyou men, it was at the bottom, eventhough the dog was barking and it was snowing, it still turned out to be an unpleasurable job. Oh well, mondays are for happiness. LOL...
1994 Oldsmobile Cutlass Ciera S 3.1L No Start, Poor Idle Quality, Stall VIN: 1G3AG55M8R
Guys this ones fixed. Most responded saying to check the injectors. After checking them a couple of different ways it was determined they were good. As a side i did learn a handy new way to test them with an ammeter from the tech help archives. The problem tur...
1996 Pontiac Grand Am SE 2.4L No Start, Backfires VIN: 1G2NE52T2T
I am done banging my head against the wall. This car is fixed. I pulled the timing cover, and the cam timing was right on - no problem there. I still had the crossfire/backfire issue, so I second-guessed the coil tower I had already replaced. Yes I said "I... Trouble codes: P0335 (Crank sensor circuit a), P0341 (Cam sensor).
2003 Pontiac Bonneville SE 3.8L Hesitation, Surge VIN: 1G2HX52K43
Thank you all for your help. Sorry for the late response but the customer took it back to the shop that originally worked on it and I just heard they got it fixed. That shop was convinced that it was in our tranny job so they stuck a reman Valve Body on it to...
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