Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 24, 2006
International Automotive Technicians' Network (iATN) - Members Only
Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1990 Buick LeSabre 3.8L Poor Idle Quality, Misfire VIN: 1G4HP54C21
the #4-#1 coil does not fire until engine is off idle.they start to fire but not very strong.have installed crank and cam sensor still same problem.thanks in advance for any help.
View
1995 Buick Skylark Custom 2.3L Cuts out, Stall VIN: 1G4NV55D9S
this vehicle dies when stabbing the throttle 4-6 times (in shop,in park, below RPM cut)It feels like fuel starving but ran remote fuel source same results. checked & cleaned grounds, checked voltage at ECM & ICM when running & dying out, both OK. Engine won't ...
View
1996 Buick Roadmaster Collector's Edition 5.7L No Start, NO VOLTAGE VIN: 1G4BN52P1T
Hey Guys and Gals, Got this one in on the hook the other day for a no start, I tested the fuel pressure and it had none. So, I dropped the tank and found to my surprise that the positive wire to the pump was melted, the pigtail was melted and half the wire in...
View
1994 Cadillac DeVille Concours 4.6L Stall VIN: 1G6KF52Y7R
Vehicle came in for a intermittent stall concern that had happened a few times in the past year or so but recently with in the last week the stall concern has happened three times to the customer and no times for us. When vehicle came in it had all of the abov... Trouble codes: P0047, P0052, P0107, P0109, P0137
View
1994 Cadillac Eldorado 4.6L Instrument cluster VIN: 1G6EL12Y7R
We have this Eldorado with an analog instrument cluster. The customer came in complaining of the AC blowing hot air all the time. The fan was running on high and the AC not working. Also the climate control and the information center are blank and no digital m...
View
2002 Cadillac DeVille 4.6L a/c blower VIN: 1G6KD54Y22
THIS IS THE SECOND VEHICLE CAME WITHIN THE LAST 30 MINUTES OF THE END OF THE SHIFT. i HAVEN'T GOT ENOUGH TIME TO CHECK AND WENT THROUGH ALL OF THE TEST AND READINGS. CHECKED ALL FUSES, RELAYS; PRESSURES ARE NORMAL; FANS ARE WORKING. THE BLOWER WILL COME AND CU...
View
1996 Chevrolet Cavalier LS 2.2L MIL Lamp on VIN: 1G1JF5242T
help getting my a.. kicked!!car came in w/check engine light on,cust had had car scanned and brought along cam sens.replaced cleared codes light on immediately.ran trouble tree 2 times came to wire to cam signal shorted to ground.subbed in good wire sens. to p... Trouble codes: P0342
View
1997 Chevrolet Blazer 4.3L courtesy lights VIN: 1GNDT13W2V
Hello Gentlemen, The interior lights do not go off on this 97 S-Blazer. I have checked all switches and replaced interior control module. Lights still on.
View
1997 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL52M6V
car came in with hesitation concern. test drove felt like was running out of fuel. test drove with scan tool and o2 sensors disagreed with this theroy. o2 stayed high around 700mv but did fluctuate down to about 200 mv. fuel trim at idle is about -20 long term...
View
1998 Chevrolet Malibu 3.1L Hesitation VIN: 1G1ND52M6W
Car starts hard after sitting for two hours or more. The car cranks five or six times before starting and then you smell strong exhaust fumes. After the initial start the car starts ok until it sits again. No codes are present, the data looks normal. The fuel ...
View
1998 Chevrolet Express 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GCFG15W6W
Hi all .I have this van that is driving me nuts.it runs like a bag of crap most of the time It is missfireing but never fires the mil.It even passed mass emissions on the dyno .The car has had complete tune up new cam sensor pulled the distributor to check the...
View
1999 Chevrolet Silverado 1500 5.3L unknown VIN: 1GCEK14T3X
noise sounds like tin tinging only under load and moving alittle does not make noise with vehicle in gear in the air motor mounts appear to be good/ exhaust is tight not hitting/ does not make noise at just idle
View
1999 Chevrolet Corvette 5.7L Stall VIN: 1G1YY22G6X
i tested fuel pressure it 8 psi book tells me 55 to 61 i enable pump from scanner no change i check steel bradded line on fuel rail same 8 psi is that line from pump or is it return line i changed fuel filter one side i can blow thought other side acts blocked...
View
1999 Chevrolet K2500 7.4L engine VIN: 1GCGK23J7X
this engine has scraping noise coming from rear part of the engine. sounds a lot like a bad throw/out bearing on a set of bad fingers on a clutch plate. i disconnected the converter from the flex plate, and even tried a new flex plate. anyone out ever heard th...
View
2000 Chevrolet Silverado 2500 6.0L prndl and battery light VIN: 1GCGK24U0Y
Hi all, I have this Chevy here with the red battery light always on. Charging system is fine. Also noticed PRNDL is off as long as ign. is in run position. It works in crank position or just off of lock position. Also noticed hi-beam indicator wont work. I rep...
View
2001 Chevrolet Tahoe 5.3L a/c VIN: 1GNEK13T61
Hi guys we have this Tahoe here. Customers complaint was that at idle vehicle was blowing warm. Brought vehicle in and check operation of all components and all appeared o.k. we found the system down about 3/4-1lbs of 134a...this system has rear air (needs 3lb...
View
2001 Chevrolet Tahoe 5.3L Gauges return to center after removing key within VIN: 1GNEC13T71
This truck came in with a dead battery...we changed it out due to age..no drain found..next day dead battery again...proceeded to isolate drain.. found 388 mA on RDO fuse for amplifier, which I still havent put my hands on...alldata shows it in the rear compar...
View
2001 Chevrolet Astro 4.3L Hesitation, Surge VIN: 1GCDM19W61
Van will surge under full throttle. When this happens ABS lite will come on for erratic rear wheel vehicle sensor. Will turn off after restart. I replaced the tps, pcm,fuel filter,plugs wires,cap,rotor and igintion coil.Fuel pressure is 60 psi and does not dro...
View
2001 Chevrolet Express 3500 5.7L hydro boost VIN: 1GAHG39R31
Hi Everyone, this van is equipped with hydro boost brakes. I don't have much experience with them. The pressure hose from the pump to the hydro boost unit on the firewall is vibrating fast and hard. You can feel it all the time that the engine is running. The ...
View
2003 Chevrolet Silverado 3500 6.6L Seal VIN: 1GBJC34123
We have this truck in here that looks to be leaking from the rear seal area. But, it looks more like fuel than oil. Before we pull the transmission I thought I should ask if there is anything in the back of the valley that will leak fuel down into the bell hou...
View
2003 Chevrolet Silverado 3500 6.6L BlowBy Tube VIN: 1GCJK33133
Hello. I am posting for another Tech in our shop. This truck under heavy acceleration will puke oil out the blowby tube, for example if you were passing someone. Any other times, the truck seems fine. Thanks in advance for any help... Scott.
View
1999 Oldsmobile Alero GL 2.4L Stall VIN: 1G3NL12T3X
good afternoon to all.I have this alero that the customer has had to me twice already for intermitant stall at idle only.first two visits unable to confirm.customer stopped in saturday morning,after he drove car approx.6 miles and let idle while he went into s...
View
1991 Pontiac Grand Prix SE 3.1L valve adjustment VIN: 1G2WJ14TSM
replaced t chain, guides and heads on this car due to broken guide causing bent valves. Alldata says tighten rocker arm nuts to 18ft lbs, they are adjustable style! 18 ft lbs bottoms the lifter so that is obviously wrong. I adjusted them by setting cam to base...
View
1999 Pontiac Sunfire SE 2.2L turn signal fuse VIN: 1G2JB124XY
vehicle came in with turn signals inop. replaced switch and fuse and problem seem to have gone away. after a week fuse blew again. changed the flasher and replaced fuse - couldnt get fuse to pop. another week went by and came back - now it is a problem and we ...
View

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L electric windows VIN: 1G4HP52L7R
Hi, guys. All info was much appreciated! There are 3 heavy gauge wires going through the drivers door harness-brown power wires [circuit 141] all coming from splice S221. While the problem occurred, I cut the wire that goes to the window lockout portion of the...
9
1996 Buick Skylark Custom 3.1L No Start VIN: 1G4NJ52M4T
hello fellow techs, I installed a PCM, as customer wanted to try it. We have not heard from them since, so we are assuming that it has not acted up since the last repair. They are a regular customer so we would have heard something. Anyway most replies said th... Trouble codes: P1573 (PCM/EBTCM Serial Data Circuit - Lost Communication), P1629 (Theft Deterrent Fuel Enable Signal Not Received), P1641 (MIL Control Circuit), C1275 (IPC/PCM to EBCM/EBTCM Serial Data Malfunction), B1049 (SIR 49 History).
8
1991 Chevrolet S10 Blazer Tahoe 4.3L No Start, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GNDT13Z3M
thank every one for your time for response. fix was fuel pump. intermittanly fuel pressure. replaced fuel pump all good to go. thanks again Trouble codes: 24 (vehicle spped sensor), 13 (o2 sensor), 33 (map sensor).
12
1994 Chevrolet Camaro Z28 5.7L MIL Lamp on, Wont flash codes VIN: 2G1FP32P9R
Thanks to all who replied. I forgot to include the fact that this will field service mode flash with the engine running. Any way, It was a bad rebuilt ecm that was giving us the fits. Also had troble with tcc and egr circuits built in to the rebuilt ecm.(Not o...
6
1995 Chevrolet Blazer 4.3L no start sometimes VIN: 1K12HTOLMN
to all that has replied.. ALL OF THE THINGS U R TELLING ME TO CHECK ARE THINGS THAT ANY MECHANIC WOULD HAVE CHECKED.. IT HAS GOOD SPARK AT THE COIL.. NEW COIL INSTALLED ANYWAYS AND MODULE BY MY SHOP.. OTHER SHOPS HAVE REPLACE CAM AND CRANK SENSORS. FUEL PUMP I...
28
1998 Chevrolet S10 2.2L exhaust glows red VIN: 1GCC51945W
exhaust flange gasket leaking and customer running e85 fuel
12
2002 Chevrolet Suburban 1500 LT 5.3L Misfire, MIL Lamp on VIN: 1GNFK16Z42
After checking into all possible problems supplied to us by the 6 techs who replied, we had to return vehicle to owner. About 2 weeks later owner called us and gave us the good news that he had no mil lamp even after taking it on a trip. I'm not positive if th... Trouble codes: P0300 (Multiple Missfire).
6
1993 Geo Metro 1.0L transmission VIN: 2C1MR6169P
we went to try a new PCM and/or TCM and recording the part number on the PCM showed it was from a MANUAL transmission ( funny how we get the whole story after we chase our tail),replacing the PCM only made everything perfect. lots of power and kick-down is ope...
4
1998 GMC Jimmy Envoy 4.3L Stall VIN: 1GKDT13W5W
This jimmy finnally acted up long enough to find problem, the light I had hooked up to the coil battery wire did not light up when it died and would not start back. No voltage to coil or module, checked dash fuses and had 3 that were dead. No voltage coming fr...
7
1999 GMC Sierra 1500 SL 4.3L Alt VIN: 1GTEC14W7X
Customer took truck to dealer ,they told him didnt charge because of bad alt but he didnt have it fixed because he already knows it not alt.
7
1998 Oldsmobile Achieva S 3.1L Ignition Lock VIN: 1G3NL52M9W
Sorry it took so long to respond, this was the first time I requested help on IATN and was surprised that we had six responses the next morning. Called the customer with an estimate to replace the switch and the customer declined the repair. Thank you for your...
6
2000 Oldsmobile Alero GL 3.4L MIL Lamp on VIN: 1G3NL52E6Y
Thank you very much for the replies. All were right on target. The reason I could not pressurize the filler neck was because of the rollover valve at the base of the filler neck. I feel pretty dumb. Anyway the problem turned out to be an intermittent vent sole... Trouble codes: P0442 (Evap system small leak detected).
4
2004 Pontiac Grand Am SE1 3.4L Misfire, Poor Fuel Economy VIN: 1G2NF52E94
Tried everything that was sent to me to no avail. Sent the car to the dealership and was sent back to me two days later with a bill and still not fixed. Tried cat, both o-2 sensors, mass air flow, and tps and still did not fix the car. Sent back to customer an...
10
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next