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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 9, 2005
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Open Help Requests for GM
Help Request Answers
1990 Buick Regal Limited 3.8L No Start, Poor Idle Quality, Hesitation, Stall VIN: 2G4WD14L3L
Please HELP!! This one is a very intermit problem. we first drive veh approx 15 mi then let hot soak after 25-30 minutes only will it stall immediately after start, but is intermit. When eng dies seams like it is running out of fuel. If engine dies it idles ro...
1998 Buick Century Limited 3.1L No Start, Poor Idle Quality, Stall, MIL Lamp on VIN: 2G4WY52M0W
vehicle came in for long crank time. We did fuel pump pressure test. Vehicle had good pressure and held during tests. Did an electrical waveform test on the fuel pump, it didn't look to good so we replaced the pump. All the time the car was in the shop it star... Trouble codes: P0506 (low idle rpm)
2000 Buick LeSabre Limited 3.8L Mechanical VIN: 1G4HR54K5Y
This one is strange. The brake pedal goes to the floor on the first apply. the next time you hit the pedal it is good and stays good until you switch directions (to or from reverse) then the initial apply the pedal is low but o.k. after that...The dealer is al...
1967 Cadillac Deville 429CID electronic climate control VIN: F710073600
I'm looking for some information on the automatic climate control on 1967 cadillac deville. I'm not sure of the motor size and the correct VIN is [...] not the required 10 digits for this old shaker. The problem is it will only work when the control head is...
1988 Chevrolet Camaro Iroc-Z 5.0L MIL Lamp on VIN: 1G1FP31F4J
Hey guys, I have an old one here thats giving me fits. This car is a garage queen, it only has 18k miles on it. This car is perfect showroom condition. What I have going on is that when its cold, on initial startup, the MIL lamp will come on with a code 34, MA... Trouble codes: 34 (maf low)
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L clutch pedal VIN: 1G1YY2187J
i put in a new clutch and now the owner is complaning it grinds a little going into reverse. he also states the clutch pedal feels soft, and when shifting into foward gears it feels notchy. i test drove the vehicle and the clutch releses just fine and shifts n...
1989 Chevrolet Astro CL 4.3L Stall, Misfire, Poor Fuel Economy, Back firing VIN: 1GNDM15Z2K
Hi Guys! Why me? This van has been in our shop before several months ago and after replacing the O2 sensor & knock sensor it ran fine. The customer states now that for the past couple of weeks it will stall out while going down the highway. When she tries to... Trouble codes: 42 (EST error), 43 (ESC failure), 33 (map), 32 (egr)
1992 Chevrolet Cavalier Z24 3.1L all gears VIN: 1G1JF14T9N
Hi again guys! Now I don't normally take in transmission problems but this lady doesn't trust too many shops in town. The problem follows; I started up the car, drove it down the street, after a few blocks the trans starts to slip. Within 6 or 7 blocks the ...
1992 Chevrolet Cavalier RS 2.2L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G1JC5448N
Four days wasted so far. This car came in running and driving but would stumble and surge on heavy acceleration. I checked fuel pressure and it was 47 Unregulated and 40 with 10 inches of vac applied to regulator. Scanned for codes and got code 33 map out of r...
1997 Chevrolet K1500 Cheyenne 5.7L Dump valve VIN: 2GCEK19R0V
Truck came in with low pedal. Front brakes look good and we adjusted rear brakes. We pressure bled system and still low pedal. We found pin coming out of dump valve on side of ABS unit. What I want to know is if I change the combination valve which has the dum...
1997 Chevrolet Express 1500 5.7L Fluid Temp, brake switch, pressure switch VIN: 1GBFG15R4V
VSS showing eratic on the scan tool but works fine on the speedo, shows no brake switch operation on scan tool but brake pedal will disengage the cruise. Shows -40 degrees on the trans temp but when the speed senor starts to send a signal the senor shows 29 de...
1998 Chevrolet K3500 Cheyenne 5.7L fuel tank VIN: 1GBHK34R8W
fuel tank will suck shut, the truck did this 1 year ago and we replaced tank and cap with gm units, did it again,can this have anything to do with the evap system? can a bad purge or vent sol. cause this problem? will engine vac cause this? its a farm truck bu...
1999 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 2G1FP22GSX
Has random misfire code P0300. Misfire counts seem to be mainly with #3, #5, and #7 cylinders. Has had misfires on other cylinders in history but mainly those 3. Fuel pressure is good, injector pulse is good, smoked intake for vacuum leaks and none found. Can ... Trouble codes: P0300 (Random Misfire)
2001 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND523X1
Hello,this car is driving me nuts.It will start and run fine for about 30 sec,then it will start hunting for idle and then stall.The strange thing is cannot get computer to set a code.Diconnected the iac,tps egr,maf all at same time and nothing.Car ran the sam...
2001 Chevrolet S10 4.3L No Start VIN: 1GCCT19W31
Talk about flooded! This customer "accidentally" drove his truck into a slow moving river. Water up to headlights(which, yes, would include the computer on the passenger side fenderwell). He had the truck pulled out 6 hours later and hasn't got it to start sin... Trouble codes: P0102 (Mass or Volume Air Flow Circuit low input), P1626 (Theft Dterrent Start enable signal), P1637 (Generator L-Treminal Circuit)
2002 Chevrolet Silverado 2500 HD 6.6L noise at steering colm VIN: 1GCHK23163
Customer complaint is a groan noise heard from Pass. compartment when turning steering wheel. This nosie is worse the longer you drive. It only happens when turning the steering whell(Vehicle does have Hydro-boost for the brakes) The noise does not happen all ...
1998 GMC Sonoma SLE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTCS194XW
Here's one that is making our lives interesting. The vehicle runs like the converter or exhaust is restricted or plugged. It will start and maintain a rough idle, engine vacuum at the intake manifold is 12 inches or less, when the throttle is opened the engine... Trouble codes: P0107 (map volts low), P0108 (map volts high), P0300 (mis fire)
1999 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1G2NE52T7X
this 2.4 is running very rich,black smoke from tail pipe.fuel trim index goes to 98 after running about 15 seconds.vaccuum at idle is 17".replaced intake gasket,removed front timing chian cover and checked chian,seems to be right on the marks.replaced up strea... Trouble codes: P0171, P0172
2000 Pontiac Grand Prix GTP 3.8L fuel pump VIN: 1G2WR1217Y
Hello Group, I have this Grand Prix that barely made it in under it's own power. Fuel pressure initially jumps up to normal when the key is cycled the engine will start and fuel pressure drops like a rock. Replaced fuel module and I actually drove it about 10 ...
1998 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5279W
OK, as soon as the oxygen sensor warms up (1 wire) the fuel trim steadily and quickly drops to -50% (or 64 INT)! the engine seems to run good, but the upstream sensor still stays in the 800-900 mv range! the customer bought the car with a bad transmission whic... Trouble codes: P0172 (fuel system too rich)

Fixes & Summaries for GM
Fix/Summary Answers
1986 Chevrolet Celebrity 2.8L No Start VIN: 1G1AW19X9G
thanks to all that replied i tested the coil anf found only 20 kv installed new coil and all is well, new coil has 40 kv.
1994 Chevrolet G20 Sportvan 5.7L wipers VIN: 1GBEG25K8R
One fact that I failed to inform everyone was that the washer pump did not work. It was recieving voltage and ground to the motor. We decided to replace the motor for the customer . Afterwards we could not get the problem to ever reoccur. I know the wipers wil...
1995 Chevrolet K1500 5.7L ring and pinion alignment VIN: 1CNEC124JK
Thank you to all who replied . iATN is truely an awesome tool!! After much trial and error I finally got help from someone who has done more than a couple of these ring and pinnion repl. Turns out that I neglected to set a correct pinion preload of the bearing...
1996 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GCEC14W9T
thanks for all your help.so far i didn,t do anything to the truck after it was in the shop last.the customer says it only happens ones in awhile that it runs bad.he's going to live with it for now.
2000 Chevrolet Silverado 1500 5.3L Belt VIN: 1GCEK19T6Y
The customer has not returned as of yet but it's starting to get warmer so I expect I'll se her fairly soon. Most responses indicated that a GM factory belt is mandatory and a new factory tensioner ain't a bad idea either. I'll be installing these if & when ...
2001 Chevrolet Silverado 3500 6.6L No Start, MIL Lamp on VIN: 1GDJC3Y111
I only received four replies, seems as if there is a shortage of Duramax techs out there. I know nothing about them but would like to learn. One suggestion was cracked injector housings, one for glow plugs and one that simply advised to stop the ether NOW. I h...
1997 GMC C2500 Sierra SL 5.7L chuggle VIN: 1GCGC29ROV
thank you all for the info on the truck. with egr blocked off, this eliminated the egr and all possible backpressure problems but did not solve the problem. Actually the solution came in the form of the distributor. One suggestion was to inspect the reluctor a...
1999 GMC Sierra 1500 SL 4.3L Hesitation, Surge VIN: 1GCEK19T1X
I have it figured out, the only reply was one to check fuel filter/pump. It ended up setting a code finaly.p1810. This a trany positon error code. Basicly there is a mechanical park/neatral switch on the side of the trany and then there is three pressure switc...
1994 Oldsmobile Achieva S 2.3L engine VIN: 1G3NL5530R
Hi guys! Sorry it has taken so long to back to you all about this one. We bought a new tester to test combustion in the coolant when our tool man came around. Sure enough, there was a trace in the coolant. I explained to our customer that the heads will ha...
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