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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 17, 2008
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Open Help Requests for GM
Help Request Answers
1992 Buick Regal 3.8L overdrive VIN: 2GAWF14L1N
Thanks in advance for any ideas. I have this regal that I inherited and am trying to sell. If the selector is in overdrive the car seems to go into neutral when stopping and turning. If shifter is in regular drive this problem doesn't occur. The car doesn't di...
1994 Buick Park Avenue 3.8L control head VIN: 1G4CW52L1R
I really need help on this buick. I have replaced the control head and checked all power and grounds, all appear to be good. Control head is black at all times. It appears to be in default mode ( a.c. compressor stays on and blows out defrost)Unit will beep wh...
1996 Buick Skylark Custom 3.1L Cuts out, Stall VIN: 1G4NJ12M2T
customer said car wouldn't start after driving for a long while then stopping at store then no start.cranks over good but no start.i have not had this problem but this morning the car will start then stop running aka start stop.hope some one out there has seen...
1996 Buick Skylark Custom 3.1L prnd12 lights VIN: 1G4NJ52M6T
got this car in customer complaining of no shift indicator on dash you can see indicator flashing very faintly. i cannot not find this prndl module that alldata says there is. i have basically the whole dash apart in the center on and around radio area etc. pu...
2001 Buick Century Custom 3.1L Excessive Emissions, Misfire VIN: 2G4WS52J11
I have a misfire on this 3.1 that only occurs after it is in closed loop, it almost seems that it is at Rev Limit during accel? Misfire monitor shows multiple, however cylinder #1 and 2 seem to be affected most. NO head leaks. Plugs are new, tried a new module...
1992 Cadillac Seville 4.9L MIL Lamp on VIN: 1G6KS53B3N
customer said when driveing , some times dash acts up speedometer stops working,transmission shifts like its in high gear car cuttts off .the car would not stay running for us at all i could hit computer when car whould idle it would act up.so we replaced ecm ...
2000 Cadillac DeVille 4.6L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on, multiple codes VIN: 1G6KD54Y2Y
i think it needs ckp sensors but wanted second opinion or more . Trouble codes: P0300, P0335, P0336, P0386
2002 Cadillac DeVille DTS 4.6L theft system VIN: 1G6KF57912
PLEASE HELP !!! We have a 2002 Cadillac Deville DTS and when it came in it had a dead battery.So I replaced the battery and then we had a crank but no start. I pulled codes P0340 cam sensor ciruit,so I tested the cam sensor and it was not sending a signal to p...
1994 Chevrolet p30/Winnie 7.4L brake pedal VIN: 1GBLP37NOS
Hi All got a low (3/4) spongy pedal before & after rear pads, blocked off front calipers, pedal 80 % better, teardown front calipers, grease sliders,ck wbrngs, all ok not flexing no wear VERY low miles this is first brake job, rear shoes down to nothing, front...
1994 Chevrolet Camaro Z28 5.7L Excessive Emissions VIN: 2G1FP22P2R
Vehicle is failing Nox at cruise. Cut off is 408ppm actual is 599ppm. Found EGR not being commanded on during test. I can not find what criteria has to be met for egr to be commanded. Egr does function properly when manually grounded from PCM. Pre Cat readings...
1999 Chevrolet Express 2500 4.3L No Start, MIL Lamp on VIN: 1GCFG25W1X
This van came in running very poorly. The problem was excessive corrosion on and inside the VCM and no 5V ref. to the MAF. Replaced the VCM, (aftermarket, per customer request). Now have the 5V ref. I followed the Pass Word relearn procedures provided by Mitch... Trouble codes: P1361 (Theft System Pass-Word Incorrect)
1999 Chevrolet Silverado 1500 4.3L Hesitation, Surge, Cuts out VIN: 1GCEC14WOX
Greetings Gentlemen This truck will cut out hard intermittantly, usually cold. I have put hundreds of miles on it in the last 45 days or so during different visits to the shop. Yesterday I actually got the eng. to cut out with the clear signs of a bad crank s... Trouble codes: P0339 (CKP CKT. Intermittant)
2000 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5285Y
we have tested through the diag charts we tested the cannister purge valve, the canister vent valve & wiring to all the testing process wants me to preasurize the tank I have no way to do this is there any other way? Trouble codes: P0440, P0441, P0446
2003 Chevrolet Express 3500 6.0L Poor Idle Quality, Stall VIN: 1GCHC39U53
help!!! this 3500 series van will not idle, fuel trims are in the negative -15 to -20. it is not the fuel pressure regulate, i pulled the vac line and no fuel at all. the idle will surge up and down and 90 percent of the time it will stall at idle. driving at ... Trouble codes: P0175 (rich bank 2), P0172 (rich bank 1), P0154
2005 Chevrolet Express 1500 LS 5.3L rear ac lines VIN: 1GNFG15T75
alright Boys and Girls, i need too replace the rear ac/ heater lines for the rear ac du to a leak on one of the line holders. My question is that alldata only cals for 1.5 labor to due theses but i see no way to do them without removing the gas tank plus once ...
1996 Geo Metro 1.3L Poor Idle Quality, Stall VIN: 2CW971N6DK
this car tow in with stall on acceleration idling fine soon i put in drive it and give gas it had no power and stall restart running fine only happen when in drive no code data look good good spark and fuel compression ok fuel pressure ok any help appreciate
1993 GMC K1500 Sierra SLE 5.7L No Start, MIL Lamp on VIN: 2GTEK19K5P
This truck will run good sometimes and sometimes not, we have found a pattern to this madness, but dont have a clue on how to fix it. We have replace the ecm, and and the coolant sensor, on the manifold, replaced the rear engine ground, removed the front groun... Trouble codes: 14 (temp signal shorted or low), 54 (fuel pump relay circuit)
2000 GMC Sierra 1500 SL 4.3L No Start VIN: 1GTEC14W7Y
has spark has fuel pressure has injector pulse all injectors ohm 11.7 to 11.9 will start and run with fuel poured down the throttle body has injector pulse checked the fuel for e85 it checked ok for gas and truck will run on the fuel out of the tank when poure... Trouble codes: P1106 (map high)
2005 GMC Envoy SLE 4.2L Cruise control VIN: 1GKDT13535
Cruise control just cuts out when driving (seems to only happen when load is put on engine/going uphill/accelerating) and very intermittant. No codes for cruise (just replaced air pump solenoid but not unrelated matter CODE#P0401). Help please!!! Michael
2005 GMC Yukon Denali 6.0L traction control VIN: 1GKEK63U15
i got this truck came with code c0455 & traction control light & service steering system, when the truck stops or make a turn not all the time, the tractuion control message comes on & the truck loose acceleration, anyway i replace the steering postion sensor ...
1997 Pontiac Grand Am SE 3.1L gauges VIN: 1G2NE52M7Y
cant beleive this two trouble makers in as many days. 97 grandam dash indicator lihgts alt abs battery speedo fuelgauge all fluctuate erratically like there posesed vehicle does not need to be running for these to go stupid thanks in advance all help greatly a...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick LeSabre Custom 3.8L Hesitation, Cuts out, Misfire VIN: 1G4HP54C3K
Thank You everyone who replied. I did replace the O2 sensor like most said. The problem was still there in open loop. So I called the Hot line. The tech there said to pull the O2 sensor to keep it in open loop and power brake the vehicle. At the same time...
1994 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52L3R
Hello and thank you for all of the great replies. please read the full fix as this car had some very strange symptoms that may be very helpful in the future. The fix here was replacement of the computer. We installed a remanufactured computer and the car has b... Trouble codes: P0406.
1978 Cadillac Seville 5.7L No Start VIN: 6S69B8Q486
Thank you all for the information, wiring diagrams, and personal experience in fixing these systems. Well after verifying all the needed inputs and outputs and still no signal on fuel pump circuit feed. We decided to go with the Vega oil pressure sending unit ...
2000 Chevrolet Venture 3.4L bucks/jerks VIN: 1GNDX03E8Y
Well thanks to all who took the time to read and respond to this one. Most responses were suspecting the torque convertor clutch as the culprit but this bucking/jerking was much more severe than your typical torque convertor engage/dis-engage, plus we had veri...
2000 Chevrolet Venture 3.4L No Shift VIN: 1GNDX03E7Y
I apoligize for the late post. I assumed my boss closed it and we all know what happens when you assume. Well first off I would like to thank everyone for their help. Since i'm not a trans tech, I was working this one kind of slow. I pulled the tranny and wait...
2001 Chevrolet Impala 3.8L ignition switch VIN: 2G1WF55K51
thanks again everyone switch was the problem nice to have bay back again hope to be able you all one day
2003 Chevrolet Impala 3.4L tpms light VIN: 2G1WF55E23
thanks for your help on this one. This tpms system use the abs for tire inflation info. The light switch option does not work either. the light has stayed out by disconecting the abs module. the customer is going to talk to the dealer that programed the vi...
2003 Chevrolet Tahoe LT 5.3L tensioner VIN: 1GNEK13Z53
After recieving 20 replies-bulk of which suggested replacing compressor, customer decided to wait till spring to replace compressor to get best use of warranty since she won't be using a/c much this winter.Dan from Tennessee said probable broken reed valve cau...
2005 Chevrolet Colorado Sport 3.5L out put seal VIN: 1GCDT13626
Found that the SKF seal is in no way even close to OEM seal. The GM seal looked to be a lot better seal. We installed the OEM seal and set customer out. Bearings were good, nothing out of the ordinary with the axle shaft, vent is clear. We will see what happen...
2003 Pontiac Grand Am SE 3.4L Poor Fuel Economy, MIL Lamp on VIN: 1GNNF52E63
Due to fuel customer was refilling with. Ran vehicle to empty anf refill the tank and everything is accurate now thanks to all again. Trouble codes: P0420.
2003 Saturn Ion-3 2.2L electronic steering VIN: 1G8AV12F43
I was never able to duplicate this issue. The customer took this vehicle for several days and never did experience the issue again. I had 3 replies and all were good info but need to duplicate the issue for proper diagnostics. Thank You for all your time. ...
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