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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 8, 2005
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Open Help Requests for GM
Help Request Answers
1988 Buick Regal Limited 2.8L No Start, Stall VIN: 2G4WD14WXJ
I'm experiencing an injector/computer problem. The problem occurs any time it's in the mood, closed or open loop. As the vehicle is running, I show good spark and good injector pulse. When the vehicle is dying out, the noid light I've plugged into the injector...
1997 Buick Century Custom 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 264WS52M3V
This one is my fault, when changing lower intake gasket I got some pushrod out of order and broke 1 pushrod and bent 1, but worse I bent 2 intake valves. So replaced valves and pushrods, Car fired right up with a SLIGHT miss, SES lights up with PO300, scanned ... Trouble codes: P0300
1969 Chevrolet Corvette 5.7L Windshield Wipers VIN: 194379S728
Inoperable windshield wipers, cowl cover is open but no motor operation, Looking for a wiring diagram for the windshield wiper system, Switch and motor have power to some wires, not sure which are correct, Switch appears to need to be grounded??? Email c&jauto...
1994 Chevrolet S10 4.3L Entire System VIN: 1GCCS14Z5R
We've all had this situation before! Customer brings vehicle in, is headed out of town in a few days, needs it back ASAP, tried to repair it themselves. They put on a new master cylinder, I don't think they bench bled it, and a new brake booster. They had the ...
1995 Chevrolet K1500 Suburban 5.7L Hesitation, Surge, Cuts out VIN: 1GNFK16K5S
okay you gm studs. i have a 95 chevy sub k1500 that wants to dog down only when the throttle is applied only in gear, i noticed on the scanner, there is a ccp selonoid that kicks on & it's duty cycle is 100%. when the selonoid is off (in park, in gear at idle)...
1995 Chevrolet Lumina APV 3.1L Surge, Misfire VIN: 1GNDU06D8S
van will start with timing cont. grounded set timing unground cont and restart backfires thru throttle body. timing chain has about 4 degress slope is this enough to give me this problem thanks in advance
1995 Chevrolet S10 2.2L Excessive Emissions
1999 Chevrolet Cavalier LS 2.2L Poor Idle Quality, Misfire VIN: 1G1JF5248X
Thanks for any help received! This vehicle misfires only in cylinder #1. The compression is 170psi. On the scanner you can see the misfire data for all cylinders and it only shows it misfiring for #1 cylinder. Vacuum readings are good. We thought that it might... Trouble codes: P0301
1999 Chevrolet Cavalier 2.2L engine VIN: 1G1JC124XX
i have this 99 cav. that does not want to produce any heat. it came in with a complaint of driving down the highway the heat is not hot. test drove & coolant temp got down to 120 deg. put in a oe t-stat & drove again. same thing. pulled off lower hose & no coo...
2000 Chevrolet Silverado 1500 5.3L coolant in the oil VIN: 1GCEK19T8Y
Hi to all and thanks ahead of time. We have a very clean one owner 2000 Chevy 1500 silverado pickup. All the sudden it started using coolant. The customer added coolant a couple of times . We drained the engine oil and found a lot of coolant in the oil. We ...
2000 Chevrolet Express 3500 7.4L tcc.slip VIN: 1GCHG39J1Y
Hello I need some help with this trans problem. This trans is a4l80e.Has code 1870 slip code checked tcc. slip speed goes up to 250rpm.when tcc. is commanded on.Slip speed shouldnt be over 110rpm.This causes trans to go into fail safe mode stays in 3rd. gear u...
2000 Chevrolet Blazer LS 4.3L Passlock VIN: 1GNCT18WOY
This Blazer will not start when the Security light is flashing. After waiting about 10 to 15 minutes the Security lights goes out and the truck starts. Owner is tired of getting stuck in mall parking lots. The fuel pressure and the ignition system is fine. Thi...
1991 Geo Storm 2+2 GSi 1.6L No Start, Cuts out, Stall VIN: J81RT235XM
compression good 150 accross timiing belt on marks,spark good, injection good, but will not start unless we crank dist to one side moved wires on cap ran better but still stalled set up cams and crank dead nut in time but rotor out 90 degrees and it starts put...
2000 GMC Yukon Denali 5.7L low beams VIN: 1GKEK63R9Y
low beams inop. day time running lights & high beams work ok. we replaced the drl module & drl diode. still does not work. the wiring from the low beam headligts to the firewall is confimed ok. both low beam bulbs were replaced. we no not have a tech 3 to comm...
2001 GMC Jimmy SLE 4.3L poor fuel mileage VIN: 1GKDT13W81
Happy new year.We've got this 01 Jimmy 4x4 with a complaint of poor fuel mileage. Scan ECM and no codes stored in memory.Fuel pressure is OK and no leaks from the regulator. On a test drive with scanner hooked up, the only unusual thing I see is O2 sensor ,ban...
2001 GMC W4500 Forward W4S042 5.7L trans case VIN: 4KDC4B1R31
This Isuzu NPR look-a-like has a crack in the bell housing from the left lower bolt hole to engine and extends up and over the bell housing to about a 2 o'clock position. The trans is a 4L80E. It vibrates in neutral (or any gear for that matter) and with the t...
2001 GMC Yukon XL 1500 Denali 6.0L MIL Lamp on VIN: 1GKFK66U31
I Need help with Mode 6 data. Cel on with code for evap vent problem. Original valve leaked when scanner energized it (closed) or when ground wire attatched to white wire( computer ground). Was replaced with new solonoid from dealer. This one leaked also. Got ... Trouble codes: P0446
2001 Oldsmobile Aurora 3.5L MIL Lamp on VIN: 1G3GR64H81
I have an intermittent code p0410. I replaced the electric air pump because the previous air pump went bad. Every time I test the car, everything works. After the customer drove the car 1,000 miles, the light came back on. Can the contacts in the air pump rela... Trouble codes: P0410
1995 Saturn SL2 1.9L No Start VIN: 1GCEC4F254
This car will run fine after a hot soak will not restart. Cranks over fine but there is no fuel pressure. Traced problem to fuel pump relay losing power from i/p fuse. Fuse checks out okay. Also notice while wiggling wires around fuse panel area, scan tool wil...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet Astro CL 4.3L Mechanical VIN: 1GNDM19W8R
as per the replies to my help request, i have installed a hydro boost brake unit. this was the culprit. the problem has been solved. thank you for all your help.
1996 Chevrolet Camaro Z28 5.7L Misfire VIN: 2G1FP22P5T
Hello all. I have received 16 replies on this LT1 plug fouling issue. Most replies pointed to the oil drain holes possibly being plugged causing the oil to pool near #8 cylinder and leaking past valve seals. Another reply was pointing to egr tube causing the i...
1996 Chevrolet Cavalier Z24 2.4L cv joint - clutch ? VIN: 1G1JF12T9T
Thanks for all the responses on this car. Got it back yesterday, pulled tranny and the front shaft bearing was shot. It sure was a funny noise for a shaft bearing. Thanks again. Dan
1996 Chevrolet Monte Carlo LS 3.1L MIL Lamp on VIN: 2G1WW12M4T
Thanks for all your help. A salavge yard PCM fixed this one. I also had to pull the instruments, and replace a missing SES lamp, and socket !!Thanks Mr Used car dealer !! I was thinking maybe a loose cam chain, as the cam pulse seem to move around some, ( just... Trouble codes: P0341.
1999 Chevrolet Tahoe LS 5.7L engine VIN: 1GNEK13R4X
Well I must reply before time runs out, but this vehicle is not fixed yet. Since posting, I performed long relearn and got vehicle running next day. It has been fine until yesterday did it again. My brother in law is getting good at the relearn procedure and g...
1999 Chevrolet Silverado 1500 5.3L bucks VIN: 2GCEK19T3X
Well Its fixed! It was a poor ground #G210 located underneath the vehicle driver door on the frame of the truck. At idle had .30 volts as the truck was loaded down it would raise to 8.0 volts! Also ran a redounded ground from the frame to the negative battery ... Trouble codes: U1041 (Loss of EBCM comm.).
2000 Chevrolet W4500 7.2L No Start VIN: 1GBG6H1UXY
No information was obtained to repair this vehicle. The particular injection pump on this vehicle has no cold start solenoid and Izusu will not allow for the replacement without being an authorized service center for them. Looks like another case of the manufa...
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 3GNEK13T02
After reading all your replies, we went back to the truck and did a back pressure test on the cats. We found at idle we had 6 psi of back pressure on the right hand side cat cat and none on the left. We removed the front pipe and inspected the converters with ...
2002 Chevrolet C3500HD 6.5L Hesitation, Surge VIN: 3GBKC34F62
I did recieve some useful information from members who claimed that there are injector pump concernes in these vehicles. And that the dealer warranty on various parts of the fuel system has been extended but I believe the fact I rebuild tranny's all day this w...
2000 Oldsmobile Intrigue GLS 3.5L steering rack VIN: 1G3WX52HWY
Hey guys, sorry but we're not going to get this one fixed. The noise that our customer is irritated with is very subtle. After identifying where the noise originates from we have found the same noise in several other GM vehicles. I'm telling you that this nois...
1995 Pontiac Grand Am SE 2.3L No Start, WEAK INJECTOR PULSE VIN: 1G2NE15D3S
this vehicle had multiple problems,first of all the two wires from the crank sensor to the ignition module were melted together and resistance was 5.0 ohms cut one wire and ran a new one and got my injector pulse and then noticed the plugs were drowned even th...
1998 Pontiac Bonneville SE 3.8L Radio VIN: 1G2HX52K0W
Thanks to everyone for the quick responses. I followed the advice of the majority and sent the radio out for repair. The bulb is soldered into the board. Thanks to everyone for their help.
2004 Pontiac Grand Prix GT2 3.8L remote keyless VIN: 2G2WS52214
The 'fix' was to send it to the dealer.Suggestions ranged from you have to have a Tech II to look in the fix database.Since this customer did not mind going to the dealer it seemed to be the easiest way to go.
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