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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 6, 2005
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Open Help Requests for GM
Help Request Answers
1993 Cadillac Eldorado Sport 4.6L Poor Idle Quality VIN: 1G6EL12YXP
I need a copy of the TPS/idle relearn procedure for this car. Trouble codes: P080
1991 Chevrolet S10 Blazer Tahoe 4.3L Excessive Emissions, Poor Fuel Economy VIN: 1GNDT13ZXM
the problem i am having is that the customer is concerned with the poor fuel mileage they are getting. I have a code 44 and my block learn is reading 109. Which indicates that i am running rich. I replaced the fuel regulator and o2. All my other sensors are re... Trouble codes: 44 (lean exhaust)
1994 Chevrolet K1500 4.3L high idle VIN: 1GCEK14Z8R
hi guys,we are having a hard time with this truck,it idles at 1100 rpms all the time,customer replaced the iac motor and the pcv valve.we blocked off the iac port and did not change,also drilled out the base idle adjustment screw will only go down to about 850...
1996 Chevrolet K1500 Cheyenne 5.7L Engine VIN: 1GCEK19R7T
Hello all. I could use a little help on this one. Vehicle came into our shop with a random misfire code, misfire on 1 3 and 8. Opened hood and found number 1 and 3 plugwires swapped, changed back and nuber 3 misfire went away. I then set cam retard and small m...
2000 Chevrolet Suburban 2500 LT 6.0L abs module, warning lamps VIN: 3GNGK26U0Y
hey everyone , This truck ,under acceleration lights up the ABS and Brake warning lights ,looses data from the ECBM . When the head lights are on the turn signal indicators come on dim just before the data loose and the lights coming on . the abs system does ...
2000 Chevrolet C2500 5.7L Misfire, MIL Lamp on
IN ADVANCE THANKS TO ALL THAT REPLY.I Found coolant in #1 cyl. (after doing all my basic tests) so then I did a Leak down test in cylinder to check for possible gasket or craked head. leak down test indicates no problems. put pressure to cooling system/sat for... Trouble codes: P0301 (cyl 1 missfire)
2001 Chevrolet Impala 3.4L low coolant level sensor VIN: 2G1WF52E21
This vehicle came in with the message center warning light coming on sometimes saying low coolant level. An audible chime would also be heard when the light would come on. The coolant level in the radiator is full. The low coolant level sensor is the square st...
2001 Chevrolet Tahoe 5.3L abs VIN: 1GNEC13T71
This truck came in with the ABS pump running all the time and the ABS light on. Found the EBCM to be bad so we replaced the module and the ABS works now and the pump dose not run all the time. But now the Traction control off light stays on and you can not tur...
1997 Geo Metro 1.3L Cuts out, MIL Lamp on VIN: 2C1MR52XV6
Vehical will not go over 1750 rpm when warm, wont go past 35 mph, acts like it has a rev limitor.Injector pulse width wont go past 3.1 ms when it acts up. I can see the injector pattern stop spraying fuel. Vehical runs fine after sitting over night, has to be ... Trouble codes: P0505
1992 GMC K3500 Sierra SLE 6.5L overdrive VIN: 1GTHK34F4N
no overdrive scanner readings of tps volts 1.76 ,tps angle% 35%, coolant temp reads -35 there all stuck there no movement what so ever.checked voltage at tps plug with volt meter reads like it should right ref, right output traced all the way to ecm same outpu...
1994 GMC K3500 Sierra SL 6.5L Mechanical VIN: 1GTHK34F9R
last repair was made in 12/31/03 at 138720 miles.OE flywheel was used with updates. All appears normal with dowel pins for bell housing,torque converter appears to be fine. What is happening to flywheel is cracking around crankshaft bolts.Back in shop today br...
1990 Oldsmobile 98 Regency Brougham 3.8L Excessive Emissions VIN: 1G3CW54C6L
Do'es not pass Em test. our local test is bar 90, 2500 rpm and Idle.Discovered that ecu is going into open loop at off Idle, over 800rpm and will cycle every 12-15 seconds open/closed, Temp won't matter 180 to 210 deg F. During closed loop o2 is normal lean/ri...
1993 Oldsmobile Silhouette 3.8L Poor Idle Quality, Hesitation VIN: 1GHDU06L6P
vehicle runs poor, frt bank manifold and egr tube glows red when rpms at 1500. maf reads 21 gps at idle, o2 varies, tps at .5, iac at 120, rpm 750 lt fuel trim at 135. only have 7 in vacuum and steady. if you rev up the engine is at 17 in vaccum. engine compre...
1997 Oldsmobile Achieva S 2.4L Hesitation, Misfire VIN: 1G3NL52T7V
Under load all the time it misfires. The reason is because all 4 injectors are intermittantly are not being fired. Ground lug at trans is good. Idle is good. All injectors ohm out ok. When I say that the injectors are not being fired, it is the pcm driver ckts...
1997 Pontiac Grand Am SE 2.4L Shift interlock VIN: 1G2NE52T2V
Intermittently can not remove key. This is electric and not cable. We have tried everything that has been posted before except replacing the shift lever. The switch has always tested ok, but it will not act up for us. The shift interlock solenoid was getting h...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Century Custom 3.3L Starting VIN: 1G4AH81N4K
well at this time, it is no longer acting up after i cleaned the throttle body ( cheapest easiest first ). It is a relatives car so... I WILL KNOW if it happens again and i will be back. All the wiring is ok, the harness was the first thing i checked. i wiggle...
1990 Cadillac DeVille 4.5L Misfire VIN: 1G6CD5337L
Well, here's the fix and boy do I feel both stupid and rightous at the same time...if that's possible. If you read the help request you'll see all of what we did and tested. Of the 10 replies we recieved most pointed towards worn cam lobes and that was our nex...
1996 Cadillac Eldorado 4.6L alternator VIN: 1G6EL12YXT
Thanks to the seven tech's that took the time to reply to my post. While going back over everything I had done and using some of your suggestions the thing set a hard code p1645 EVAP solenoid output circuit. I run the diagnostics and found the EVAP solenoid ha...
1994 Chevrolet S10 Blazer Tahoe 4.3L starter VIN: 1GNDT13WSR
im sorry to have to close this help request but after trying to get the customer to bring back the truck i had to give up the customer said that he cant do with out his truck right now if it comes in i will update this thank you all for your help and i hope to...
1995 Chevrolet Blazer 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13W6S
Customer had decided to trade vehical in. I believe that James Garrido had the fix for it on his April 19th post in the tech forum # 9241. Thanks to all who contributed to this. Steve Trouble codes: P0341.
1996 Chevrolet Lumina APV 3.4L Cuts out VIN: 1GNDU06E7T
Thanks for those that took time to respond. I got a little lucky on this little van. It seemed to cut out when hitting bumps and on a speed bump, so I tried torqueing the engine in the shop and that didn't do it, but when I started to wiggle wires, it would st...
1997 Chevrolet S10 4.3L convertor VIN: 1GCCS14X9V
Hi sorry it took so long to get this closed. just wanted to be sure. I decided to go ahead and replace the torque converter. After getting into this job i foung out that the transmission had been replaced. According to the torque converter shop we use it was p...
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1C1JC5247V
Well what a great way to end the week! we found that you cannot trust aftermarket parts. we had suspected injectors to be the problem, and after replacing the new injector again, we were about to call the customer and recom. replacing all injectors. when I rec... Trouble codes: P0300.
1999 Chevrolet Silverado 1500 4.8L flasher relay VIN: 1GCEC14V1X
Well ,out of 13 replies-all said the same thing,replace the multifunction(directional switch).Apparently one half of the switch shorts,causing the flasher to close and open making the clicking noise.We replaced the mutltifunction switch and no more clicking.Th...
1999 Chevrolet Silverado 1500 5.3L mode switch VIN: 1GCEK19T4X
The mode door motor was the problem. It had battery voltage at the brown wire, but it would not sent the refrance voltage out of the white wire. I made sure the white wire was not shorted to ground, it was not. I replaced the mode door motor and the mode switc...
1994 GMC K2500 Sierra SL 5.7L ddaytime running lights VIN: 2GTFK29K0R
i took the diodes out and took them to an electronic shop,they too tested it ,they said they were fine as well,but while i was there i bought them anyhow,installed them and now they daytime running lights work fine!!! go figure.any how goes to show you maybe u...
1997 GMC K2500 Sierra SL 5.7L speedometer VIN: 1GTGK24R7V
Thanks to all who replied. Howard [...] indicated the GM test procedure was incorrect, so following his advice we did get the VSS to malfunction during testing, (still good according to GM specs) Replaced it & happy customer. Again thanks for the replies.
1997 GMC K1500 Sierra SL 5.7L Poor Idle Quality, Misfire VIN: IGTEK14R3V
hi guys thank you some much for all your help so far ihave not gotten very far. but i do have an update fuel trim b1 94 fuel trim b2 126 thanks again for all your help louiev Trouble codes: P0300.
1997 GMC Suburban C2500 5.7L rotors drums shoes
hello all... thank you everyone that pointed me the right direction. the rear drums were so out of round til they were locking up and causing the front to go into abs mode.. thank for your help everyone..
2001 GMC b7 school bu 8.1L aux brake warning VIN: 1GDL7T1E71
I dont have much to say on this one yet. I have changed the flow switch and checked the brake switch and everythig else I can think of. I think I may have an electrical problem but I dont have any info on this system. Time for company to get book on this vehic...
1999 Oldsmobile Alero GL 3.4L suspension or body VIN: 1G3NL52E1X
replacing the wheel bearing hub on the left front solved the noise.thanks to all the techs who helped in this endeavor.
2001 Other GM ISB 5.9L Surge, MIL Lamp on VIN: 4UZAAPBW81
we are still waiting for an ok from customer.since it is a fleet vehicle it takes some time for an answer. thak you. Trouble codes: 109 (eng. speed).
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