× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 12, 2004
International Automotive Technicians' Network (iATN) - Members Only
(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 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G6CD5332L
Greeting Guys& Gals This caddy has me biting my nails. At all times it acts like an old carbed car used to in that when idling it will blow black carbon smoke all over the ground. What has me stumped is that the O2 sensor will be at .450 mvolts in open loop, b...
1989 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCDK14KOK
this truck has a lean condition above idle idle o2 volts range from 82-.08 when you rev up to 1500-200 o2 sensor falls steady to 0 volts and stays there. disconect o2 and it goes to default. truck runs strong and powerful but idles poor and surges. we have rep... Trouble codes: 44 (o2 sensor lean)
1991 Chevrolet G30 Beauville 5.7L steering gear VIN: 2GAGG39K7M
I have a customer who hauls Amish crews in this van. Three different times this van has broken the bolts that attach the steering gear to the frame. Bolts have been replaced with GM parts and the steering gear has been replaced also. I have inspected the front...
1995 Chevrolet Cavalier 2.2L Starting VIN: 1G2JB14H1R
This vehicle has a had time to start when it does, you can accelate slow and it is ok tromp on the peddle and it falls on its face. We replaced the fuel pump, sock, fuel filter, map sensor, all four fuel injectors, and just know the crank sensor. Fuel psi is 4...
1995 Chevrolet K1500 Cheyenne 5.7L Master/Slave Cylinder VIN: 1GCEK14K5S
Owned truck for 2 years. For about 6 months now, I have to "pump" the clutch pedal SEVERAL times a day just to get it to shift easy, otherwise it is a real chore to shift to 2nd at a stop. No leakage, and no fluid loss from Master Cylinder. Have flushed old br...
1996 Chevrolet C3500 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 4A3AX35G2W
This vehicle has an irregular missfire when hot. It is a 1 ton with a milk cooler box on the back, used for making deliveries. The driver said it would run fine for 25 or 30 miles, then begin to miss and hesitate. If shut off for a half hour or so, the miss wi... Trouble codes: P0133 (HO2S1 Circuit slow response B1S1), P0135 (HO2S1 Heater Fault B1S1), P0137, P0141 (HO2S2 Heater Fault B1S1), P0155 (HO2S1 Heater Fault B2S1), P0340 (Camshaft Position Sensor Circuit)
1997 Chevrolet C1500 5.7L Pinging VIN: 2TEK19R9U1
We have this vortec 350 that came in for a pinging complaint , Customer has installed a new EGR , knock sensor and full tune up . No codes in the system , data stream revealed nothing out of the ordinary , fuel trim is 128 , O2 sensors tested good , fuel press...
1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M7V
I need some help with this one. I'm using the diagnostic tree from the shopkey information system to try and find what is causing a code P0446. Going through the tree it says to use EVAP Pressure/Purge Diagnostic Station [J41413]. Is there any way to test this... Trouble codes: P0446 (Evap. System Canister Vent Blocked)
1999 Chevrolet Tahoe LS 5.7L starts,dies in 2 sec VIN: 1GNEC13R7X
Thanks for your help in advance. I hope this is not a redundant question, but how can I bypass the immobilizer system on this Tahoe. I've heard about a resister that could be installed, but am not sure about the procedure. Any help would be greatly appreciated...
1999 Chevrolet Camaro Z28 SS 5.7L ride VIN: 2G1FP32G6X
Hi guys, This one is preety goofy. On hard accel. at about 3500 rpms. I get a real good vibration& when you back off to [...] you get a wierd humming noise from it seems like the trans. If you drive normally this stuff won't happen. Also if you keep the tra...
1999 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14WXX
I have a Ho2 nightmare and I hope some one has seen this before. I have used two different scanners and still get the same readings, sensor 1-1 and 2-1 vary with good cross counts and steady pulse width readings on both banks.Sensor 1-2 shows roughly 650 to 80... Trouble codes: P0420 (poor catalyst bank one)
2002 GMC Sierra 2500 HD 6.0L Fuel Tank Going Dry VIN: 1GTHK24U82
Customer filled up fuel tank and it was sucked dry overnight and all fuel ran on the floor. Truck drew 40 Litres of fuel out overnight. When customer went to fuel up there was vaccuum at tank. Noticed plastic tank had dent and has not been hit.
2000 Oldsmobile Silhouette Premiere 3.4L Battery VIN: 1GHDX13E5Y
Thanks in advance for all of your help. I have this van with an on going complaint for a no crank no start condition. Found no problems with battery, starter, or alternator. Checked for a draw which messured @ 61 mA. Which was a bit on the high side, specs. ar...
1993 Pontiac Sunbird SE 2.0L Reverse Linkage VIN: 1G2JB14K2M
After doing a ton of work for this customer they had only one more request...get his car to go into reverse. From under the hood I can push the rod in far enough to catch both fifth and reverse, but from inside the car with the shifter the rod only pushes int...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Century Custom 3.3L Misfire VIN: 1G4AH51N4K
Friends, I got a number of good replies about further diagnostics, most focusing on ignition but one on mechanical. But spark was not an issue and I had no evidence that timing could somehow be off on those two cylinders, though I admit I didn't try to check...
1994 Cadillac DeVille Concours 4.6L Poor Idle Quality VIN: 1G6KF52Y2R
I took me long because we order the part in the dealer. The problem was the map sensor that goes inside de admission near the fuel regulator. This sensor was all full with engine oil. This is natural to happen because of the pcv system. So as mileage goes by w...
2000 Cadillac Seville SLS 4.6L power steering VIN: 97YU189454
thanks to all the replies, the customer was advised to the P/S pump,needing replacement, will live with it for now, although the vehicle has an exteneded warranty. i know that this one wiil be back.again thanks john [...] CMAT L1
1991 Chevrolet C1500 Cheyenne 5.0L Power steering pump VIN: 2GCEC19HXM
The pulley apears to have been the problem, we believe that after the first pump went out the pulley spun and since then has been slipping. Installed another pump and pulley. So far so good. Ill post again if we have anymore problems. Thanx to everyones replie...
1992 Chevrolet Blazer Cheyenne 5.7L No Start VIN: 1GNEK18K4N
Thanks to all who replied. I believe the pickup cured the problem. After talking with a tech hotline I found they experienced similar problem when you tried to restart too soon after key off. They recommended a 10 second wait before restarting. It started ever...
1997 Chevrolet K1500 Suburban LS 5.7L steering VIN: 1GNFK16R6V
Thanks to all that replied, We jacked the front of the vehicle up and the wheels turn right when we start the vehicle. We recommended a steering box but the customer doesnt want to do it at this time. When he does do it I will try to repost to let you know tha...
1994 GMC Sonoma SLE 4.3L Cuts out, Stall VIN: 1GTDT19W6R
Found injector wiring harness to have broken wires,between plugin behind altenater&injector
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next