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Prev Professional Automotive Repair Technical Discussions for June 20, 2007
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Open Help Requests for GM
Help Request Answers
1993 Buick Century Special 3.3L MIL Lamp on, Quad driver circuits VIN: 1G4AG55N0P
Car came in , complaint was check engine light comes on at times. Checked for codes : history code 26 quad driver circuit failure problem. Road tested & check engine light always comes on at about 35 MPH and stays on even up to freeway speeds 75 MPH. light w... Trouble codes: 26 (quad driver circuit problem)
1998 Buick Regal LS 3.8L RF Door window VIN: 2G4WB52K5W
Hello we have a problem child! dont we all!! on this car the driver window quits working after a month of working. Everytime we put a new one in it, it lasts 4 a month each time. We have put three window motor assy. in it we have checked the driver door wiring...
1999 Buick Regal GS 3.8L abs module VIN: 2G4WF5211X
Very good customers, very clean car. ses light and abs and trac lights come on and flicker off, No codes at first but then it finally stayed on long enough to give me p1608 and c1298 both communication codes and very simple 3 step process to condemn the ebcm, ...
2000 Buick Regal LS 3.8L dome lites VIN: 1GT1HFGSKO
fuses good,trying to by pass bcm to confirm but still cant get lites to come on with power probe.and also door and trunk ajar lites are on and shift performance lites are on in ip.
1998 Cadillac Seville STS 4.6L Guages VIN: 1G6KY5498W
Vehicle came in customer stated the guages all went dead, speedo registers 90 mph. Has a multitude of codes. P1652,P0300,P0404, P1189, P1520, P1599, P1611, P1612, P1613 & P1614. ABS Codes C1252, C1253, U1255. The car acts like is loosing power or ground someho...
1999 Cadillac DeVille 4.6L Stall VIN: 166KD54Y5X
This car stalls that is intermittant. Have checked fuel pressure and grounds. Have replaced both crank sensors and iac and have cleaned throttle body. Checked for bad connections. Snap shot on tech II shows nothing. Fuel pump was replaced about 6 months ago. D... Trouble codes: 1599
1992 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 1GTEK14K7N
truck came in as a no start. previous guy put a pump etc. the truck starts runs for 5 secs, dies. new dist installed, injectors etc. tps, coolant temp sensor etc. the odd thing is that by luck i noticed that when it dies or wont start at all, i have 0 volts ac...
1992 Chevrolet K2500 Cheyenne 6.5L overdrive code 68 VIN: 1GCGK24F9N
Owner brought in truck and wanted new trans because it was acting "strange" and the oil was burnt and stinky. We put in reman trans and then, a few weeks later, he brought it back saying it was doing the same thing as the old one. After it has got up to operat...
1994 Chevrolet C1500 Cheyenne 4.3L crankshaft endplay VIN: 1GCDC14Z9R
This is my first post and thanks for any replies. We have a crankshaft endplay problem. We installed a crank kit in the vehicle 4102 miles ago. Some history- we R@r and rebuilt transmission at 280,870 miles- no problem until 322846 miles at which time the truc...
1996 Chevrolet K1500 6.5L MIL Lamp on VIN: 2GCEK19S8T
hi guys, have this chevy truck with a head scratching code PO406. EGR sensor circuit high. this uses a map sensor to watch vacuum to egr. 7" at idle 20" driving with little throttle, when turbo builds boost egr vacuum drops to 0" is this right? on scaner desir... Trouble codes: P0406
1997 Chevrolet Astro 4.3L brakes & steering VIN: 1GKDM19W7V
While driving this van, the steering has no power assist when idling, like the pump isn't there. Bump up off of idle and the power assist is there. After driving a few minutes, the brakes lock down, worse when going into a turn. There's been 2 power steering p...
1997 Chevrolet Tahoe LS 5.7L trans and no scan serial data VIN: 1GNEC13R8V
I inpected TC and no obvious signs of any heat discoloration or other, flex plate is intact and bolts are tight. Fluid is good and dipstick is right on. No DLC scan communication. performed step by step and replaced VCM, with NAPA reman. - flashed by NAPA. S...
1998 Chevrolet Cavalier 2.2L pedal VIN: 1G1JC5243W
customer complaint is a hard pedal. test drove verified.there is 15 inchs of vaccum at power booster. power booster will maintain vaccum.scanned abs no current codes no histort codes.have done automated abs test with otc genesys pass.removed abs fuses and rela...
1998 Chevrolet K1500 Suburban LS 5.7L Misfire VIN: 3GNFK16R1W
Thank you all in advance for your help! Suburban is here with a very random miss at around 40MPH and again around 62MPH. Missfire counters random cylinders but do not go over 2 counts. No counts in missfire history. No DTC's set. Fuel pressure at 58 psi and ho...
1999 Chevrolet K2500 7.4L Poor Idle Quality, Misfire VIN: 1GCGK29J0X
came in for engine miss at idle warm or cold. monitor misfire data-cylinders 1 & 8 continual misfire at idle. gradually/intermittently cyls 2, 4, & 7 will begin to misfire after idles for 3 or more minutes. miss clears above 1200 rpm. no codes stored. cleane...
2000 Chevrolet S10 4.3L Level select VIN: 1GCCT19W5Y
Customer came in about a week ago complaining of noise under dash, heard hissing found the mode selector switch leaking so replaced unit took care of problem. Car came back this week customer says doing same thing but it wasn't just blower would not change pos...
2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK19T7Y
Vehical was here two weeks ago for diag of MIL. At that time only DTC p0300b ws present. Bank one was adding fuel and bank 2 was subtracting fuel. Y pipe and o2 sensors were coated with mud and stuff. Repair trac info and fix database show pattern converter fa... Trouble codes: P0200, P0300, P0463
2001 Chevrolet Suburban 1500 5.3L Poor Idle Quality, Misfire VIN: 3GNEC16T91
this suburban has a rough idle with the a/c on. the plugs, wires have been changed. the fuel inj cleaning has been done. the throtle body has been removed and cleaned. the egr valve has been checked. we have used a smoke machine for the intake. this problen on...
2003 Chevrolet Avalanche 1500 5.3L Ring Gear VIN: 3GNEK13593
This Guy goes off road and uses it for work I put the last set of gears in it I set pinion depth and back lash and the ware pattern is still good but this time it shred 8 out of 10 bolts from the ring gear. The last 2 times it shred teeth off the ring gear. I ...
2003 Chevrolet Avalanche 1500 5.3L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 3GNEC13T33
runnig at road speed lost power towed to shop no power poor idle Trouble codes: P0300
1996 GMC C3500 Sierra SL 6.5L No Start VIN: 1GTHC33F0T
had this vehicle driven into shop with the problem vehicle starts fine cold but after the truck is driven up to operating temp. and is shut off it will not restart until it cools back down this truck from what the customers have told me is just a lemon. Trouble codes: 236 (Boost Sensor 1 Out of Range)
1999 Pontiac Grand Am SE 3.4L power steering pump
family car curse strikes...this is my mothers car and she had an alternator go out which my father replaced..after repair power steering pump started making noise..found to be low he topped it off but it still had no power he put a new pump on it...
1999 Pontiac Grand Am SE 3.4L door locks VIN: 1G2NE52E7X
Any help would be appreciated. Replaced all lock relays six months ago for this same problem which is the doors will not lock but they will unlock. Sense then when the relays are swapped around everything works until now. Note all relays are the same, bought f...
2005 Saturn Vue 2.2L transmission VIN: 5GZCZ33D45
My sources say the TCM is at the left front shock tower but I cant locate it. The PCM is attached to the engine and has code P0700a. I am assuming this is a generic transmission code and the TCM will have more precise info if I could acess it. Mac Mentor wont ...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Riviera T-Type 3.8L brakes VIN: IG4EZ11C8K
This vehicle is most likely fixed. I say this because the original problem was intermittent. Several suggestions addressed mechanical issues, not involving the ABS unit. Nobody seems to have experienced this lockup issue. We rechecked all these mechanical iss...
1993 Chevrolet K1500 Suburban Silverado 5.7L Poor Idle Quality, Surge, Misfire VIN: 1GNFK16K9P
Thank all of the persons that replied information. It was appretiated and helpfull.the finall repairs was grounds and distibutor and replaced ecm. The ecm seemed to allow idle air controll to function better. Thanks to all of you. Marvin Trouble codes: 43 (ESC failure).
1998 Chevrolet Malibu LS 3.1L blleding system VIN: 1G1NE52M0W
after several hours and different bleeding procedures, bleeding from abs module one pump at a time seemed to do the trick. it has been a couple weeks and no come back from the car. i thought i closed this request. i apologize to anyone that was hoping for an a...
1999 Chevrolet Silverado 1500 4.8L Hesitation, MIL Lamp on, backfires VIN: 2GCEK19V7X
thank all of you guys for your help the person that suggested the integrity test of the 02s was a great test result, however the customer decided with everything els the truck needed & the high milage that he dcided to trade the truck in for a new one& cut his... Trouble codes: P0137, P0157.
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, no power VIN: 1GNDT13SX3
Well we worked on this one for a while longer but could not figure it out. The owner wanted to take to a chev dealer to see if they could fix it they said they unhooked the exhaust and it ran perfect(we did that with no change) it only took them about an hour...
2004 Chevrolet Silverado 2500 HD 6.6L excessive ex. smoke VIN: 1GCHK29194
After checking the turbo and the engine oil for fuel dilution which were OK, we sent the vehicle to a GM dealer. They replaced the injectors, and did do a warranty policy adjustment. This did solve the problem. Thanks for your help and advise.
2005 Chevrolet Trailblazer LS 4.2L rear hvac VIN: 1GNET16S55
Most replies said that a GM scan tool was needed to reprogram the rear HVAC module. Mitchell has a procedure to reprogram, but it is for the main HVAC controller not the auxillary unit. Customer decided to control the rear from the front for now. Thanks for ...
2002 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Hesitation VIN: 3GKFK16Z52
First, thank you all for your help and input. During our lengthy test drive, we found that a/c compressor was seizing up. When this occurred, the faltering/hesitation of the engine occurred. Replaced the failing compressor and the problem was resolved. We are ...
2003 GMC Savana 1500 5.3L Fuel tank VIN: 1GDFG15T43
Survey says , apparently not an uncommon problem , filler neck not available seperatly , tank unbelievably expensive , salvage yard couldnt come up with one,relative newness and optional tank working against us.Not my first choice but went with resealing fille...
1988 Pontiac Firebird Trans Am 5.7L Stall VIN: 1G2FW2186J
Customer decided to take vehicle, after two weeks of driving, we could not duplicate problem, I guess we will see how it goes
2001 Pontiac Grand Am SE 3.4L Theft Deterent VIN: 1G2NF52E51
Thank you to everyone that responded. I waited a little while to reply because the problem was very intermittent. I wound up replacing the passlock sensor connecter at the back of the lock cyclinder and I have spoken with the customer recently. No more prob...
1995 Saturn SC2 1.9L Poor Idle Quality, Hesitation, Surge, Stall VIN: IG3ZDG6ZS1
thanks everyone,changed cat,and all is good.agian thanks to everyone who help. Trouble codes: 53 (knock sensor too much knock present).
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