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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 25, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on VIN: 1G4HP52L6S
car will intermitently have dead miss.another shop put plugs and wires on but no fix.cam and crank signals check good at icm.magnet for cam sensor looks ok(sometimes they fall off)balancer seems ok didnt slip or any thing.sometimes when started the car will ha... Trouble codes: P0341
1997 Buick Park Avenue 3.8L vibration VIN: 1G4CW52K0V
replace original motor with a used unit from a 95 olds 88. got a vibration after the change only under power. the car idles fine and runs great execept for the vibration. I originally thought the vibration was an intermittent miss but found nothing to prove my...
1997 Buick Skylark Custom 3.1L MIL Lamp on VIN: 1G4NJ52M4V
we have been fighting this code for about a month - we installed a carquest oxygen sensor was fine for about three days came back, installed a delco sensor and good for about a week , back with same code.installed a dealer sensor , back after three days. repla... Trouble codes: P0135 (bank 1 sensor 1 heater circuit)
1997 Buick LeSabre Custom 3.8L Stall, MIL Lamp on
hello this vehicle runs fine most of the time, i got it to act up once w/ the maf unplugged the sft maxxed out & set the code at idle. i haven't been able to find any vacuum leaks.it seems to be electrical since it comes & goes at random.i have checked some gr... Trouble codes: P0171
1999 Buick Regal LS 3.8L Heat and Air VIN: 2G4WB52X16
Customer stated that the driver side blows hot only. Started veh, turned on blower both sides blew cold. changed to heat and driver side only blew hot. Pass side stayed cold. manually changed dual climate control for passenger side and it blew hot. switched du...
2003 Cadillac CTS 3.2L Stall VIN: 1G6DM57N73
This car has only stalled one time for me when I had the scanner on . It triggered a PO638 Throttle Actuator Control Command Performance. There was two other codes stored in memory. Cannot get car to stall any more to do any testing. I was hoping someone else ... Trouble codes: P0638 (TCA Command Performance), P2119 (Throttle Actuator Control Throttle Body), P2101 (Throttle Actuator Controll Motor Circuit)
1992 Chevrolet C3500 Cheyenne 7.4L Stuck in 2nd gear VIN: 1GCHC33N8N
I have a 1992 Chev C3500 Dually 7.4 lt. Just replaced the trans (4L80E)with a GM serta. After driving about 8-10 miles the trans acts like it is going into neutral. When actually it goes in to 2nd. It will not upshift nor downshift it is stuck there where it w...
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire VIN: 1GNCT18WXS
had new goodwrench motor about 40,000 miles ago. customer brought in with ses lite on, and bad misfire. we checked cap ,rotor and wires,(which customer had reused with new engine) and replaced them and the plugs , #2 plug was severly fuel fouled. the data stre... Trouble codes: P0300, P0133, P0134, P1133
1996 Chevrolet Cavalier Z24 2.4L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1G1JF12T4T
Hi, I sure could use your help. I have a 96 Cavalier with a P0134 Code (No activity on B1S1 O2 Sensor).O2 sensor is always reading .4 volts & never going into closed loop. I checked the O2 sensor under the hood with a voltmeter-reading .9 volts. I created a la... Trouble codes: P0134 (No Activity detected on B1 S1)
1996 Chevrolet Caprice Classic 5.7L no heat VIN: 1G1BL52P5T
will have heat after repair at first fill , drive car at highway speeds will go cold let sit for 5 min. wiil get hot bleed the sys a number of times read all posts if this a reverse flow sys then the top hose should be cold and the bottom hose hot after a crus...
1997 Chevrolet C1500 5.0L brake pedal VIN: 2GCE19M0V1
replaced leaking master cylinder. replaced leaking rear wheel cylinders. low pedal still. bled system, bled system, bled system. still low pedal. used tech 2 tool to cycle abs pump. bled system still low pedal. rear wheel cylinders will bleed 2 times with good...
2000 Chevrolet Impala 3.4L Battery light VIN: 2G1WF55E6Y
Vehicle was brought in for "alternator". Battery light and brake light would come on and would have a "BUZZING" noise coming from near the center of the Inst. panel. Connected Vantage and noticed Alternator dropping out on occasion to battery voltage. consider...
2001 Chevrolet Malibu 3.1L turn signal switch VIN: 1G1ND52J01
customer complaint was turn signal switch was inoperative at times, and would hear clicking sound when switch wasn't being used. replaced turn signal switch and they work all the time now, but at times it still makes a clicking sound, when neither turn signal ...
2002 Chevrolet Corvette 5.7L Driver info Center VIN: 1G1YY22G22
Have this vette with no display on the (DIC) driver information center. I can use the tech 2 and see all the data you are supose to see but nothing comes up in the display. Even when you turn on the ignition they have a greeting that comes up thats not working...
2003 Chevrolet Impala 3.4L dash lights and lights on radio VIN: 2G1WF52E03
Hello. We have a 2003 Chevrolet Impala with NO dash/instrument lights when the headlamps are on. Codes present in BCM are: B1440 powermode master input circuits mismatched B3128 driver door unlock output short to B+ NOTE: There are NO radio lights either. N...
2005 Chevrolet Malibu 2.2L mil VIN: 1G1ZS52F95
code p0125? insuffient collant temp thermostat works ok fan comes on at 230 deg. fan stays on doesn't shut off. Computer possible? please help
1995 Geo Prizm LSi 1.8L Cuts out, Severe Jerk on Accel VIN: 1Y1SK5287S
Vehicle came in on wrecker, no start, college student, minimal funds. found secondary ignition intermittent spark, replaced wires, excessive resistance; distributor cap & rotor, excessive corrosion; ignition coil, because it lit me up while I was testing for c... Trouble codes: 31 (map)
1995 GMC K2500 Sierra SL 6.5L No Start VIN: 1GTGK29F0S
Thanks in advance for any help. We had this truck come in and the only problem this gentleman has is that the truck is hard to start when cold. We had changed the injector timing module for him and he was convinced that was the problem. We had a used one here ...
2006 Hummer H3 3.5L No Start VIN: 5GTDN13656
Dear members: I got a 2006 Hummer H3 with no start problem. Occasionally we could not crank the engine and suffered the following situations: -could not shift out of P when depressed brake pedal -ABS MIL comes on -instrument cluster out of function Has an...
1993 Oldsmobile Achieva S 2.3L No Start VIN: IG3NL5437P
customer compliant was that it ran ok, turned the corner car died, restarted but acted like it ran on 2 cylinders, car was towed in. had to replace the starter, had a broken nose cone, checked for spark, has spark, checked ignition pulse has pulse only with th...
2001 Oldsmobile Alero GL 3.4L service engine soon light, anti lock light, and tr VIN: 1G3NL52EO1
Service engine soon light, antilock light and trac off light illuminated.
1994 Pontiac Grand Am GT 3.1L trans VIN: 1G2NW15M8R
Ok this seems to be simple but.. The complaint is it doesn't shift.My findings are no power at pin e on trans connector.If i jump it the trans upshifts normal.Codes 28,59,75,76,77 there is no power to the egr valve either.alldata says the erls fuse is where th...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L Gas cap VIN: 1G4HP54K11
Thanks for all the e-mail. The funny thing with this car is there were no codes in the computer. That is why I was confused. I did perform a smoke test that proved inconclusive. Even though the cap tested good, we installed a new one from GM. To reset the ligh...
1991 Cadillac DeVille 4.9L digtial Display VIN: 1G6CD53B3M
Thanks to everyone who replied, Glen,Kerry,Lamont,Juan hit the nail on the head. The ECC was shorted and killed the BCM. Customer wanted used so a trip to the salvage yard fixed him up, everything is up and running. You were a great help guys. The ECC was kill...
1985 Chevrolet K10 Scottsdale 5.7L hydraulic VIN: 1GCEK14H7F
This one got alot of attention. 67 replies in all. What would we do without IATN? Unfortunately, this vehicle is still not fixed. I'm convinced the problem is in the front leaf spring/shackle area, however the customer will not let me go any further. He says h...
1989 Chevrolet S10 4.3L Excessive Emissions, Poor Fuel Economy VIN: 1GCDT19Z8K
hello to all, thanks for the inputs, Egr ports plugged, cleaned out fix the code 32, rebuilt throttle body with new injectors still runs a little rich but much better, also found out speedo replaced with out setting true mi. truck really has about 200,000 mi o... Trouble codes: 32 (egr problem).
1996 Chevrolet Blazer 4.3L vent VIN: 1GNDT13W8T
trasnfer case was overfull, the transmission and transfecase vent tube are tied together. so the fluid leaked out of the tranny, and filled the trasnfercase overfull, then pushed out the vent and onto the exhasust. costomer didnt have $ so we just drained tran...
1996 Chevrolet K1500 Cheyenne 5.7L Cuts out, Misfire, backfire VIN: 2GCEK19R8T
I 1st of all figured since most of my replies included replacing the fuel pump, that was probably the problem. 2nd the key test that cinched it for me was to deadhead the pressure by clamping off the return line and check for a double in pressure which I didn'...
1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M6W
Thanks for the help. The CAT was faulty, but the leaking injectors apparently ruined it. I took advice and compared the front and rear 02's, where at idle the front toggled ok and the rear hovered around 650 mV, and at steady 3000 rpm the front still toggled g... Trouble codes: P0420 (cat effeciency low bank 1 sensor 2).
1999 Chevrolet Silverado 2500 6.0L oil pressure VIN: 1GCGK29U5X
The customer has decided to trade in the truck for a new one with the diesel next month after reading the 5 replies I allowed him to see. It's not what I would have done, but considering the mileage he puts on his trucks, it may be the best choice for him. All...
2002 Chevrolet Impala 3.4L radio VIN: 2G1WF55K72
Thank you for all your replys. It was a bad Radio. Sent the radio out and had it repaired. Radio repair company said that the radio would read the serial data but stop processing before it verified vin. Radio back in working fine. Did not have to reset with fa...
2002 GMC Sierra 1500 SL 4.3L Misfire VIN: 1GTEC14W82
thank you all for your help. the fix was that someone had pulled the harmonic balancer off and did not get it back on all the way. this the relucter ring was moving back and forth about a 1/8 of a inch or so, causing the crank sensor to see misfire counters. j... Trouble codes: P0300.
1999 Pontiac Grand Am SE 2.4L flex plate VIN: 1G2NE52TOX
could find nothing wrong with vehicle.had originally installed genuine gm flex plate.aftermarket this time and hoped for the best.
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