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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 2, 2007
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 2.5L Cuts out, Misfire, BACKFIRE VIN: 1G4NV14U2M
the customer brought the car to us with the complaint that the engine will cut off when taking off from a stop at times. when i test drove the car i found that it misfired badly and would backfire through the intake. i am leaning toward the map sensor or ig mo...
1993 Buick Park Avenue Ultra 3.8L power steering VIN: 1G4CU5319P
Hey guys. This one is causing us some concern. First the car came in with a waterpump that broke and the belt rubbed through the powersteering pump. We replaced the water pump, power steering pump, and belt. The cust took and said some times the assist would q...
1975 Cadillac Eldorado 8.2L ecomomy lights VIN: 6L67S5Q403
the customers complaint was the economy & power lights were both coming on at the same time. we did circuit test on both lights (which is controlled by a vac. switch) & each light came on serperately (circuits ok) the customer looked around & found another swi...
1999 Chevrolet K1500 LS 5.7L Cuts out VIN: 1GCEK19R4X
Main complaint hard miss and slow recovery time when entering from freeway on ramp at WOT at 70 mph or pulling trailer uphill. Engine will surge momentarily, cut out hard enough to shake the truck. After backing off, normal power comes back after about a half ...
2000 Chevrolet Tracker 2.0L motor VIN: 2CNBJ13C1Y
This unit has a bad vibration only at idle, gets worse when in drive with foot on the brake. It actually shakes the vehicle. Goes away instantly above idle. I did not find anything broken, pryed on all the motor and tranny mounts... balancer looks to be intact...
2000 Chevrolet S10 4.3L valve train VIN: 1GCCS19W3Y
Hi, I was looking fo some insite on this before I tear into this thing. I have mantanined this truck for years, the customer drove it in the other day with all the lifters rattling and saying the truck was over heated a few days ago. I tested oil the pressure....
2001 Chevrolet Silverado 3500 8.1L convertor VIN: 1GBJK39G91
Working on an allison transmission that has a dry bearing noise at 1200rpm. I disconnected trans from engine and the noise goes away. The noise sounds like a dry u-joint. Noise in park or neutral. Starter was checked. Any help before I disassemble trans would ...
2000 Pontiac Grand Prix GT 3.8L No Start, Poor Idle Quality, Stall VIN: 1G2WP52K7Y
Hello, I've got a weird one,a week ago a customer had his car towed to our shop as a no start.I checked the vehicle and had no spark fuel pressure reads 40 psi.I then checked the plugs and wires found coil towers to all be very badly rusted and wires were rott...
2002 Pontiac Aztek 3.4L rear hatch VIN: 3G7DA03E82
This car has a occasional rear hatch not opening. Codes are B1397,device volt ref. output 1 circuit low,B 1398 device volt ref. output 1 high,U1040 loss of mem. EBCM,EPCM. If you remove battery cabel and reconect the symtom goes away for days or weeks. Custome...
2001 Saturn L300 3.0L Misfire VIN: 1G8JW53R51
Veh came in 3 months ago with a misfire on Cyl. #3. Found the 1-2-3 coil was bad. Replaced coil, misfire gone... Veh returned last week with a Random misfire code (Po3oo). After connecting scanner found that cyl. # 6 has a constant misfire. Replaced coil and I... Trouble codes: P0300 (Gives random cyl. code but only cyl. 6 misfires)
2005 Saturn Ion-2 2.2L power steering VIN: 1G8AJ52F55
what next? while driving[after about 5 min.5 miles]the electronic p\s quits.[power steer message on dash]and code c0475. if you pull over shut the ignition off restart p\s works for a little less time and miles before quitting again.when p\s is working scan to...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Cadillac DeVille DTS 4.6L MIL Lamp on VIN: 1G6KF57982
All the replies said to use oem cat. I did use a namebrand aftermarket cat and spoke to their tech line which said they have seen no problems. The cat is working and the back o2 does not mimick the front. I was looking for a reflash that must not exist. Th... Trouble codes: P0420.
1994 Chevrolet K1500 5.7L diff swap VIN: 2GCEK19K2R
Thanks for all the input.Special thanks to Jordan who has done the same swap.Your info helped the most!!!The swap went perfect.The only part I had to change was the u-joint.I used a precision joint #448 with the outside clips.My e-brake cables worked perfect o...
1998 Chevrolet C2500 Cheyenne 5.7L No Start VIN: 1GCGC29R7W
Well, after pulling my hair out for two days its finally out my door. I had a partially clogged fuel filter that was the cause of the low fuel press. But the truck still wouldn't start. So after going over no start diag. three times, I decided to check the spa... Trouble codes: P0161.
2001 Chevrolet Impala 3.4L power steering VIN: 2G1WF55E31
Thanks for the replies. By the tiime we called the customer, she already had it fixed at another shop, she told us they replaced the power sterring pump. Thanks again
2001 Chevrolet Monte Carlo SS 3.8L no crank often VIN: 2G1WX15K21
Well thanks for the replys. On the 2nd day I got to look at this car I know that the ignition switch sends battery voltage to PCM on C2-23 PPL wire crank or not the PCM grounds the 76 pin alsoC2 every time it will crank. the bcm sees 1.7 volts every time the k...
2002 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF55E72
Thanks for all the replies. I went back and checked everything I could think of that would cause the LTF to be that far off and could find nothing. I then drove the car on and off for two days and could not get the monitor to run again. Finally, I gave the ca... Trouble codes: P0420 (Catalyst System Low Efficiency).
2005 Chevrolet Malibu LS 3.5L Manual Heater Systerm VIN: 1G1ZT52875
The customer picked up this vehicle and has not yet decided what he wants to do. Most replies suggested the actuator on the blend door. Thanks to all that replied.
1998 GMC K1500 Sierra SL 5.7L security light VIN: 1GTEK19R1W
thanks for all the help guys the column put in this truck was from a 1997 i called gm and asked if there was a difference in the pass lock and sure enough so i ordered a new pass lock ignition and bang it starts and runs fi...
1998 Hummer H1 6.5L front brake VIN: 137ZA8438W
thanks for the advice guys, brakes are not fun on a hummer
1999 Oldsmobile Silhouette Premiere 3.4L trans VIN: 1GHDX03E8X
Customer is going to trade the van in on something else.Customer does not want to put money into replacing the trans.
1989 Pontiac Firebird 5.0L No Start VIN: 1G2FS21E0K
mr [...] you saved my butt this morning i went back to the car to see if it would start and it did so i let it sit for a few and retried this time i was looking at the security light it did not go out so i tried a start any way no dice the pas key will disab...
1996 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T7T
thanks fellas ended up being coil housing was firing internally thanks for all the help. Trouble codes: P0301, P0141.
1999 Saturn SL1 1.9L Harsh Shift VIN: 1G8ZH5280X
Call it fixed! As directed I removed the plug on top of the transmission and ohmed out each solenoid connector. One solenoid read open. Removed top cover and top of valve body and tested each solenoid directly to eliminate possible connector problem. Found ...
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