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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 2, 2005
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Open Help Requests for GM
Help Request Answers
1988 Cadillac DeVille 4.5L power steering pump VIN: 1G6CD5156J
Hi, this car came to me with power steering bearing noise and growling, but the car steered without any problems...replaced the power steering pump, no bearing noise but it is growling and foaming like crazy. It just won't bleed off, and I went through 6 quart...
1996 Cadillac Seville STS 4.6L Alternator VIN: 1G6KY5294T
Will be looking into the car in the AM, just wanted to get a little input first. Has code 1911 Gen L-Terminal Fault. Customer stated alternator just replaced and still no charge. As I recall the instrument panel controls the L-Terminal. The only steps I'v...
1997 Cadillac Seville SLS 4.6L speedo, tach, prndl illumination, temp guage, tcs VIN: 1G6KS52YCV
Hello, pull up a seat and read on if you have the time. This car has had problems with the battery going dead overnight from time to time and I have never been able to duplicate a drain using the proper test methods of never opening the circuit by using a drai...
1997 Cadillac DeVille 4.6L fuel leak VIN: 1G6K54Y1VU
customer came in complaning of gasoline smell from car after driving. after inspection I found that fuel was leaking from from the vent for the carbon canister. Ran some test and found the canister purge valve to be at fault according to service manual. Custom...
1989 Chevrolet Corsica 2.8L No Start, Poor Idle Quality VIN: 1G1LT54W8K
Car was towed in complaint was that the car wouldn't run, got the car in the shop and it started it but when base idle was broken it would die. checked fuel pressure and got 36psi koeo and 34psi koer which was below specs so we replaced the fuel pump also repl...
1992 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 2GTEC19K2N
OK this thing is being difficult. It will not start after a hot soak. We get power to the coil when it won't start. There is no injector pulse and no spark. We have replaced fuel pump, distributor, coil and computer with no change. Checked all grounds and ther...
1994 Chevrolet K2500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, Poor Fuel Economy VIN: 1GCGK24K4R
Ok this one has me pulling my hair out and Im gettig a real case of tunnel vision.We installed a new longblock in a customers truck.With the EST disconected it all seemed fine. we set timing cleared code 42 reconected the EST and the the idle started moving up...
1994 Chevrolet K2500 7.4L Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 48HSA2424Y
I tried a new ECM and all pin wires connectors to ECM are tight. I put new wires to control module so there is no open or short in wiring. Tried a complete rebuilt distributer with no luck. After a restart, within 5 seconds the code appears. Runs ok when the l... Trouble codes: 42 (ECM has seen an open or short to ground in the Ignition Control or by-pass circuits)
1995 Chevrolet C1500 Suburban 5.7L 2-4 shift band VIN: 1GNEC16K3S
Hey, I'm getting my hiney whipped by this 4l60e. It was brought to me out of vehicle for overhaul. I completely overhauled it with new seals and clutches. It came back about a week later with no 2cnd or 4th gears. The 2-4 shift band was wiped out. I pulled it ...
1997 Chevrolet Express 1500 LS 4.3L MIL Lamp on VIN: 1GNFG15W4V
The owner of this vehicle stated that a week ago the service engine soon light came on and the vehicle began to run a bit rough and then it ran fine but the light stayed on. Our initial testing shows a code P0300, and vehicle tests drives fine. I double check... Trouble codes: P0300 (Random cylinder missfire)
1999 Chevrolet Express 3500 5.7L Hesitation VIN: 1GCHG39R4X
This van has a cold hesitation when you first take off. Van idles fine but hesitates/bogs on accel for less than one block. no codes computer data look good ect and iat match on startup. I don't know where to go from here. Your help is needed. Thank you for yo...
1999 Chevrolet Monte Carlo LS 3.1L Poor Fuel Economy VIN: 2GWW12M5X9
have already replaced crank sensor with ac delco sensor. vechicle has poor fuel economy and tach has intermittent needle jump. Trouble codes: 336 (crank sensor 24x)
2003 Chevrolet Silverado 1500 5.3L Stall VIN: 1GCEC14T93
Hello all not sure what I have hear truck came in last week with low fuel psi (48psi) replaced fuel pump assy. customer picked up truck all was good till yesterday then same complant stalls truck has elect.throttle control with I.A.C. internal has any one seen...
1992 GMC TOP KICK 3116CC light VIN: 1GDL7H1J8P
when driving the primary brake light comes on . the brakes feel good when applied. the primary brake light also comes on when turning . the p/s pump and brake booster have been replaced. thanks for any info. jim
1997 Pontiac Bonneville SE 3.8L Misfire, MIL Lamp on VIN: SVH2144671
any body out there ran into this before ,please help gm tech. Trouble codes: P0300
2001 Pontiac Grand Am SE 2.4L No Start, Stall VIN: 1G2NF52T51
Hey guys thanks in advance. Here is one for you GM guys. This car originally came in on my day off as a cranks but won't start. I understand that it started for the tech, and my boss convinced himself that it was in the ignition. Hence the ignition mod and s... Trouble codes: P1632 (received disable fuel code from bcm), B2958 (passkey circuit shorted to voltage), B2960 (incorrect code or password received)
2002 Saturn SL1 1.9L tcc VIN: 1G8ZH5D812
Vehicle came in with very delayed and harsh shifting. No codes. Sent transmission to local builder. Now shifts great but tcc wont engage and sets Po741 TCC stuck off code. Have completed TSB for wire harness at transmission but no diference. All data says to u...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L ride control (vcrss) VIN: 1G6KD52Y6T
Another one down! Thanks for the help and ideas. The problem was two fold. The rs0038 code was due to a defective pump. The air lines connected to it develop condensation which causes the pump to fail, the rs0060 code was due to a defective left front position...
1998 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y7W
Not sure if this one is fixed or not. Messing with the wiring seems to have fixed it. Most replies revolved around cam sensors. Has been gone for 3 weeks with no troubles...
1999 Cadillac Seville STS 4.6L rf speed sensor codes c1233 and c1226 VIN: 1G6KY5498X
Thanks for all the help, it was suggested to run a new pair of twisted wires from the sensor to the module as rfi. could be causing the problem, and to use a used module instead of the rather pricey new one. The customer decided to live with the light on and l...
1999 Cadillac DeVille 4.6L fuel door,dash,trunk VIN: 1G6KD54Y4X
alright guys, i discovered that my general service guys had been jump starting vehicle in morning to pull out and then let it run. when i went to pull it out found bad battery replaced and repaired damaged ground wire under rear seat and problem solved. thanks...
2002 Cadillac Escalade 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GYEK63N02
Thanks to Michael fron New Jersey I have found the problem. I got the customer to drop his keys in the night drop and checked it first thing this morning. I pulled the engine covers and used propane to find the intake leak. The key is to check it cold. Waiting... Trouble codes: P0102 (low maf frequency), P0171 (fuel system lean), P0174 (fuel system lean).
1977 Chevrolet Nova 5.7L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1X27L7L149
Thanks to all who responded. Sometimes you start banging your head against the wall on a problem vehicle and get tunnel-vision. Most of the replies were very helpful. The distributor needed a new shaft. I couldn't find one locally so we ended up putting in a u...
1993 Chevrolet K1500 Cheyenne 5.7L all shifts VIN: 2GCEK19K6P
Dear Techs: First of all a BIG THANKS to all that replied; because of your help this truck is FIXED! 7 of the answers were right on the money; false 4X4 low input to the computer! It ended up being a wire shorted to ground going to the switch.Like some of you ...
1997 Chevrolet K1500 Cheyenne 5.7L drive line VIN: 2GCEK19R1V
Thanks to all who replied with 10 plus ideas to try. The winner is:Torque converter clutch chatter! Upon further testing, I could just touch the brake pedal to disengage the TCC while the noise/vibration was present and it would stop immediately whether in 3rd...
1997 Chevrolet S10 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCCS1440V
We decided to 'go with our gut' and pull the timing cover to inspect cam timing. Unfortunately the timing was on. The chain was a little loose, and since we were there, we installed a new chain and gears. This took care of a little rattle that was coming from ...
1999 Chevrolet Malibu LS 3.1L Misfire VIN: 1G1NE52J7X
Gentlemen I recieved 25 replies describing everything from injector failures, inj plugging, low compression, mechanical damage, vac leaks, inj driver failures, coil failures, and egr issues. I'm sorry to say the customer didn't wish to spend any further money ... Trouble codes: 102 (maf sensor low frequency), 304 (4 cylinder misfire), 341 (cmp sensor circuit), 410 (air pump system).
2000 Chevrolet S10 4.3L Sound/noise VIN: 1GCDT13W22
Well, I received much information. And I had never serviced a GM 4.3 engine before this one. No never. The first set of conditions is to recap and say that consistently, this engine had a noise that was in the engine when the engine was COLD. The Oil press...
2001 Chevrolet Astro LS 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDM19W11
thanks for all the great replies.as i said in my post we had checked fuel pressure,it was good,had put on new gm cap and rotor. for some reason my scantool would not do the injector leakdown test,so i did it manually by grounding the injector pulse wires.turns... Trouble codes: P0300.
2002 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK528X2
YES it is fixed. Car has been gone for 2 weeks. There are 2 items that I would like to give info on. 1) evap 2) VVTi ACTUATOR I replaced the cam gear and the charcoal canister. I put in a lot of info and TSB's. Hope this helps someone. Everyone should know... Trouble codes: P1349, P0440, P0441, P0446.
2002 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDT13S52
Thanks to all who replied. We ended up focusing on the upstream O2 readings and circuit, as Perry [...]. from maine suggested. We Tested the ground and heater circuits and these tested good. We replaced the sensor and monitored the sensor readings, they showed an ... Trouble codes: U1000 (class 2 serial data problem), P1345.
2005 Chevrolet Cavalier LS 2.2L torque pull VIN: 1G1JF14F75
Thanks to all who took the time to reply. After countless tries to swap tires, checking suspension & steering parts, and even getting another vehicle from the dealer (which @ 15,000 miles was a rattle-trap & handled worse then the subject vehicle), the owner t...
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