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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 16, 2004
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Open Help Requests for GM
Help Request Answers
1992 Buick Riviera Luxury 3.8L Cuts out, Stall VIN: 1G4EZ13L1N
Hello fellow techs, I am posting this for a co-worker.This Riviera will run great,Ac works good. After about 5 minutes of operation it will stall if the ac is turned OFF at idle.All grounds have been ck'd,batt connections cleaned and tightened. a new ecm and I...
1994 Buick Park Avenue 3.8L blower motor VIN: 1G4CW52LXR
The blower motor is running at all times with the key out of the ignition. I cannot find any electrical diagrams on the blower control module or relay location
1997 Cadillac Seville SLS 4.6L Unknown VIN: 1G6KS52Y8V
This vehicle has me in great need of someone's help. This vehicle is doing the strangest thing. It does not do it all the time but is pretty consistant. When you first pull away from a stop, in forward or reverse, the ABS pump comes on and it feels as if the b...
1998 Cadillac Eldorado ETC 4.6L etc VIN: 1G6ET129XW
help please driving car normal speed 20-50 traction control comes on for about 5 seconds,pump running front brakes drag then quits.no codes checked speed sensors ok.has had updated harness from cadallac.i'm new to iatn.
1984 Chevrolet P30 Step-Van 5.7L Unknown VIN: 1GBGP32M4E
When turning the steering wheel at any time; about every 90 degrees of rotation the assist will cut out and then in again. I changed the pump but no difference. The only other two things left are the hydroboost or the gearbox but which one? Thanks for your hel...
1988 Chevrolet C1500 Cheyenne 5.0L Hesitation, Surge VIN: IGCDC14H9J
The fellow that mows my yard brought his pick up truck over with a real bad hesitation from a dead stop. His buddy and himself changed the engine. It came from a 84 chev car so they had to change the intake. Actually looks like a pretty good job. I checked for...
1991 Chevrolet Lumina Z34 3.4L engine VIN: 2G1WT14X7M
This car stalls when the ac. is turned on and it is completely warmed up. At 230 degrees the fan motor comes on and if it is at idle it stalls. Put a new battery in it thinking more amps to cover the load and still stalls. Only one time I tested the battery an...
1997 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R9V
This truck has a p1406 code for auxilary emissions malfunction and I have not been able to find any good diagnostic help for this code. Just hoping that someone else has encountered this and can point me in the right direction. The truck runs fine but the SES ... Trouble codes: P1406 (auxilary emissions malfunction)
1998 Chevrolet Express 3500 5.7L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GBHG31C4W
Hey fello techs, this vehicle will suddenly lose power, but usually not stall. No back fire. No codes. Fuel pressure is fine when having an "event". Cylinders 3 & 7 show a misfire, but then both clear up and will run fine. Just tuned up with filters & all igni...
1999 Chevrolet Lumina 3.1L Surge VIN: 2G1WL52M1X
car surges under light to medium throttle and will set po336 on every test drive.have not seen code set while in shop.have normal waveform from 24x at ecm and 3x.have 8 times freq. from 24x as from 3x.during snapshot engine rpm is at 1600-1700 rpm when code tr... Trouble codes: P0336
2000 Chevrolet Impala 3.8L No Start, MIL Lamp on VIN: 2G1WF55KXY
Hello all, I have a 2000 Chevy Impala with a police package. The engine is turning over very slow with a new starter and all of the plugs pulled. In fact, we can smell the new starter burning up trying to turn the engine. We even tried another starter. Bad ca... Trouble codes: P0135 (O2 Heater CRT Bank 1 Sensor 1), P0141 (O2 Heater CRT Bank 1 Sensor 2)
2000 Chevrolet Express 3500 5.7L rear axle/hub seal VIN: 1GCHG35R9Y
Hi group, This chev 3500 van has been a thorn in our sides for too long now. So, we decided to go to the best brain-trust we know, you guys! Over the last 1 1/2 years we have replaced the leaking rear axle/hub seals in this unit. Counting this time, makes thr...
2000 Chevrolet Blazer LS 4.3L Poor Fuel Economy VIN: 1GNDT13W8Y
This Blazer only gets about 350 km per full tank of fuel.The complaint is that this is excessive.A FULL tune-up including plugs,wires,cap,rotor,fuel filter,in-tank fuel additive,pcv valve, as well as a oil change and Moto-Vac.This fuel injection system is beyo...
2001 Chevrolet Prizm 1.8L cruise control VIN: 1Y1SK54881
Cruise control does not set. When you turn on the master switch (on the steering column stalk) the cruise light falshes that there is a problem. Checked for codes by jumping the connector under the hood and it flashes a code 32, steering column switches. Wen...
1985 Oldsmobile 98 Regency Brougham 3.8L Poor Idle Quality, Hesitation, Misfire VIN: 1G3CW6938F
Hello Everyone, This vehicle came in today with a complaint of running rough and erratic idle. It feels as if one or two cylinders are missing. Upon scoping it I noticed cylinders 1, 2, and 6 have no spark line(on primary or secondary waveform). Also these sa...
1999 Oldsmobile Alero GL 3.4L valve/lifter VIN: 1G3NL52EXX
Okay everyone, This car came in with a check engine light for a misfire and was running good when it got here.Upon inspection of the spark plugs I found coolant on the number 6 plug.We installed new head gaskets.After the motor was back together it had a skip ...
2001 Pontiac Grand Am GT 3.4L injector pulse VIN: 1G2NW52E91
Hello, hello ! This one was dropped off as a no start.Have good spark , fuel pressure (53 KOEO),but no injector pulse. Tested 7x resistance,not bad, but borderline, replaced it. Checked all fuel injectors resistance.All within spec. Disconnected MAF sensor. I ...
1993 Saturn SL2 1.9L Hesitation, Surge, Cuts out, Stall VIN: 1G8ZK5578P
Hello Tech's The complaint is the car stalls coming to a light and speedo jump to 135 when stopped Also the odometer moves too. Any help in this matter is greatly appreciated. Thank You for your prompt attention. Thomas [...] Huntington Chrysler /JEEP Trouble codes: 26 (quad driver module QDM), 48 (info flag ref pulse error), 75 (air temp unstable), 52 (batt volts out of range), 27 (info flag Quad driver module fault)

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick LeSabre Limited 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4HR54C5J
Thank You for all your help went round and round on tps voltage cont to climb, tryed all replys finally used a dealership tps instead of aftermarket and problem was resolved has not been back in weeks. remembered seeing this before with some one online and the... Trouble codes: 21 (high tps voltage), 22 (low tps voltage).
1987 Cadillac Fleetwood 4.1L Speedometer VIN: 1G6CB518XH
Hi Thanks to all who responded. We sent dash back in and got back, still is inoperative for the first min. of operation. We then, again monitored vss signal and signal to dash with lab scope. we found the amplitude of the signal changed after 60 seconds, It go...
2002 Cadillac Escalade 6.0L i/p hvac VIN: IGNEK62N03
as previously mentioned i thought this wasnt a power supply problem...not,after some further testing i was able to isolate this condition to an intermittant open within the under hood fuse block,,,radio fuse. temporarly wired in a fuse to radio keep alive circ...
1970 Chevrolet camaro ss 350CID need tune up
most of you said 30 for dwell adj.tune has been done after that without problems,thanks!
1991 Chevrolet Cavalier RS 3.1L daytime running lights VIN: 1G1JC11T9M
WE checked all wires for a green connection and no luck, vehicle doesnt have a relay in this system. The only thing we can add to this is that the daytime running lights didnt pulsate when vehicle was not running. Customer took car before we could continue wor...
1992 Chevrolet Camaro RS 5.0L kills fuel pumps VIN: 1G1FP23E2N
Sorry for slow reply. Thanks for all input and help.I forgot to emphasize the car never quit running, but not restart after turning it off.Following all suggestions,the several techs that suggested tank contamination or damage,seem to be on the mark.Dropped ta...
1998 Chevrolet Express 2500 LS 5.7L No Start VIN: 1GCGG25R2W
Sorry for the delayed closing. Thanx to all who replied, It ended up having a bad fuel pump module.
1999 Chevrolet Blazer 4.3L Surge, Cuts out, MIL Lamp on VIN: 1GNDT13W1X
Thanks to all who took the time to reply, and esp Greg [...]!!! This was one for the books. The harness running down the back of the bell housing had rubbed through on the dip stick mount. This caused all kinds of havoc with the reference voltage. Vehicle rep... Trouble codes: P0122 (tps voltage low), P1122 (tps voltage low).
2002 Chevrolet Trailblazer LS 4.2L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GNDS13S92
The MAP sensor was bad even though the voltage was within the range given by All Data. Special thanks to Jason [...] who let me call him. He found a bulitin that described my problem and said he thought it was a MAP problem. I put a MAP on and the thing run... Trouble codes: P1514 (MAF air flow out of range).
1993 Oldsmobile 88 Royale 3.8L fuel gauge VIN: 1G3HN53L9P
found the part in question at a dealer in pa. put the fuel slosh module in and all works fine at this time.
1995 Oldsmobile Cutlass Supreme SL 3.1L temp gauge VIN: 1G3WH52M1S
TSB 33-81-18 covers this condition and fix (thanks, Steve). It involves replacement of the CTS with a combination cts and gauge sender (2 wire to a 3 wire) and a jumper harness to connect it to the gauge sender wiring harness connector. The existing gauge send...
1995 Oldsmobile Achieva S 2.3L Hard Start VIN: 1G3NL55DXS
Well All, I'd like to say it's fixed, but the customer just dropped the car off today. Got 4 replies one said possible head gasket, one which I thought could be quite relevant was to check the oil pressure as Bill from Arkansas suggested. Eric, Kurt, and Scott...
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