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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 8, 2007
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L Excessive Emissions, Surge VIN: 1G4AH54N6L
We got this from another shop. They installed a new Cat. This car is in for a failed Emission test. NOs failed. We do NOT have a gas analyzer. What I do is get the car running correctly, then take it for a retest myself. When in open loop the car runs and id...
1995 Buick Park Avenue 3.8L Cuts out, Poor Fuel Economy, MIL Lamp on, no serial data VIN: 1G4CW52K6S
I want to thank you for any help you can provide. I have never ran into this before and I am not much on changing parts for no good reason. Customer complains of engine cutting out intermittently and MIL on says fuel milage has dropped dramatically. When I hoo...
1997 Buick Park Avenue 3.8L Engine VIN: 1G4CW52K0V
Car came in with tensioner pulley broken. Upon replacing tensioner the timing cover broke. Replaced timing cover and started engine, tapping noise heard. Seems to be coming from the timing cover side of the motor. I pulled off the timing cover a second time to...
2003 Buick Century Custom 3.1L driver window VIN: 2G4WS52J13
i have 03 buick century that wene key is switct on drivers window goes down let sit for a miniute and u can start moving it up and down again have no idear what to do
2001 Cadillac DeVille DTS 4.6L gauges VIN: 1G6KF54951
Hello, this 2001 Cadillac DTS Deville has a reoccuring problem. Approximately 4 month ago it had to be jump started. Upon checkout no problems were found but battery was replaced. Today the same thing happened. Yesterday it drove fine, today completely dead. A...
2004 Cadillac Escalade EXT 6.0L tpm sensors VIN: 1JU7459302
Hey guys and gals. God bless all and thank God for IATN!!! This isn't a specific technical repair help request but this escalade brought forth a major expense to the shop. When our tire technicians break and mount the tires we use euro paste. Recently we have ...
1979 Chevrolet C10 Cheyenne 5.0L Master Cyl. VIN: CCU1491161
Ever few days front brakes will lock up the pedle will be right at the top and you can not push it truck will barely move. Cust. says he is not using brakes hard are pulling trailer when it doe's it. If he lets it set tell the next mourning its ok and want do ...
1990 Chevrolet S10 Blazer 4.3L Excessive Emissions, Poor Idle Quality, Surge, Misfire, Poor Fuel Economy VIN: 1GNCT18Z6M
BLazer came in a week ago with complaint of rough idle at stop. we tuned it up( cap ,rotor ,wires, plugs , ff, and cleaned throttle body.) they picked up drove it for 3 days and came back. said gas was running out the tail pipe. Well , pulled it in a confermed...
1994 Chevrolet C1500 Cheyenne 6.5L Surge, over rev VIN: 2GCEC19P9R
This vehicle was brought in with a complaint of surging and bucking with possible transmission problems. One of my guys took it for a drive and returned before going around the block stating that there was something else was wrong that should be addressed befo...
1996 Chevrolet K3500 6.5L Stall VIN: 1GBHK33F6T
Hello all I have a problem diagnosing intermitent stall. vehicle will restart for 2 minutes or 2 days put new ignition switch no help. any help would be great. Thank you Dave
1999 Chevrolet S10 2.2L Hard start VIN: 1GCCS1441X
This truck has a very hard start when it is shut off and sits for over half an hour.All the spark plugs were fouled black with fuel.The fuel presure is good and seems to be holding presure.There is nothing on the scan tool that is out of specs.The Long term fu...
2000 Chevrolet Silverado 1500 4.3L oil filter VIN: 1GCEK14W4Y
truck came into shop with large oil leak,filled with oil and upon start up found oil filter leaking very bad at gasket,replace oil filter filled with oil and upon start upblew out oil filter gasket removed filterand inspected oil filter housing everything look...
2001 Chevrolet Cab & Chassis Silverado 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GBJC34U21
Hi, sure could use some help.2001 Chevy C3500 HD truck came in with a check engine light on.Engine bucking under load & rough idle.LTFT's are over 20%.Scanned PCM with Genesys and retrieved P0171,P0174,P0300, & P0332. Road tested vehicle, engine bucked severel... Trouble codes: P0171 (p0174-), P0174 (p0300-), P0300 (P0332- Bank 2), P0332 (Bank 2)
2006 Chevrolet Silverado 2500 HD LT 6.0L door locks VIN: 1GCHK23216
This is a bit of a head scratcher.. Customer has automatic door lock feature that locks doors at a certian speed. system works just fine. Problem is he doesn't want it! With and automatic transmission there is a program selection that will shut down the auto l...
1997 GMC Savana 3500 6.5L Losing speed signal VIN: 1GTHG35F5V
Hello everybody, When we started working on this van I noticed that on the road test the speed signal would drop out and the van would hunt for gears. This happens more as you let off the throttle at around 60KM/H and when the vehicle is warm. The speed signal...
1998 GMC Jimmy Envoy 4.3L Hesitation, MIL Lamp on VIN: 1GKDT13W7W
Need some help with this truck,I have replaced the tps senser 2 time's and have also replaced the computer 4 time's and had each of the compuyer's flashed.Now with the old pcm the truck will run, the customer had bought 2 used pcm's and when they were installe... Trouble codes: P0122, P1122
1998 Oldsmobile Silhouette Premiere 3.4L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1GHDX03E0W
The owner of this van complains that at idle, the vehicle will intermittently stall, or nearly stall. When the vehicle nearly stalls, but catches itself it will lunge foreward with a bang or jerk from the driveline. If the vehicle does stall it will immediatel...
1989 Pontiac LeMans LE 2.0L Thermostat housing VIN: KL2TR51KB3
Hi all, was replacing the thermostat on this Lemans (Korean build) and I broke the thermostat housing. Not available from my jobbers and dealer tells me it's discontinued. Tried a couple local yards to no avail. Anyone have any thoughts on where I can find one...
1991 Pontiac Grand Prix STE 3.1L Hesitation, Surge, Stall VIN: 1G2WT54T2M
Vehicle come in complaining of dying and hesitation. What I found is that it idles good but right off idle about 900 to 1000 rpm it will hesitate, surge and or dye. If I test drive it it will dye when comming to a stop. I reset minimum idle high to see if this...
1999 Pontiac Sunfire SE 2.2L cooling fan VIN: 1G2JB1244X
Cooling fan turns on normally at the correct temp,but when antifreeze temp drops to 190* the fan stays running.If I shut off engine and restart the fan will be off until the next time its needed,then it will stay on until I cycle the ignition again.Relay is no...
2002 Pontiac Bonneville SSEi 3.8L Heads Up Display, and Heated Seats VIN: 1G2HZ54102
the heated seats switchs light for one second then shut off, and the Hud is dim in the daylight. the hud does not seem to dim with the headlights although you can adjust the intensity with the dimmer switch. i think that the hud should dim just like the radio ...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Roadmaster 5.7L Speedometer VIN: 1G4BT5373N
After a night of head scratching came in this morning and applied masking tape to sensor gear. After reinstalling and running vehicle found no tracks on tape consequently the two gears are not meshing. Close examining I think shows that part of the top mountin...
1995 Buick Park Avenue 3.8L volt meter VIN: 1G4CW5217R
Well here is the close. I went to check for codes and found 4 new ones. The cusomer has a wrecked Buick for parts so I grabbed the computer out of it. Now it surges when driving but the charge rate is steady and didn't drop in 3 hours of running. I told him he...
1997 Cadillac Eldorado 4.6L Poor Idle Quality, Misfire VIN: 1G6EL12Y8V
Thanksto all of you that had replied offing assistance. Sometimes you can't see the forest for the trees. I have to trust that the MAF reading is correct as I smoked the engine and found the EGR tube left loose at the bottom where it enters the crossover and l...
1993 Chevrolet Lumina APV 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDU06D4P
Victory is mine!!! This problem child is fixed.I began taking off the heads and noticed the intake had been off recently. the customer forgot to tell me this! I began to think about over adjusted valves, but due to large carbon deposits on the valves( I did tr... Trouble codes: 45 (rich exhaust).
1994 Chevrolet Lumina 3.4L engine VIN: 1G1WP11S8R
I received lots of helpful information about this job. The only correct way is to pull the head. There were many other possible fixes for this which may work. I have passed all this information along to the customer. He has yet to decide what he wants to do. ...
1994 Chevrolet K1500 Cheyenne 5.7L Hesitation VIN: 1GCEK19K4R
As much as I KNEW it wasn't the convertor, It turned out to be the catalytic convertor.It ran too good to be it during the first test drives.The more I drove and tested the more it was clogging up. I am the proponent to never overlook ANYTHING!And that is exac...
1996 Chevrolet C2500 Cheyenne 6.5L starter motor VIN: 1GCGC24F4T
thanks to all that replied. the fix was the park/netural switch on side on transmission. at times under low battery conditions. it would feed back to starter relay. iatn is a must have for any repair shop.
2002 Chevrolet Monte Carlo SS 3.8L Passlock System VIN: 2G1WX19368
First, I want to thank each and everyone of you for taking the time to write me with all the information you shared. I want to point out that on this car I found a little of everything, from loose connections at the BCM (though none of them went to the passloc...
2002 Chevrolet Corvette 5.7L Driver info Center VIN: 1G1YY22G22
Had cluster repaired all is well. We see alot of corvettes here with cluster problems but not like this one. Also found that you are not supose to turn them face down for any long period of time, it will ruin the fluid filled guage core. Who knew. Anyway thank...
1990 Pontiac Grand Prix LE 3.1L No Start VIN: 1G2WJ54T6L
Just about everybody said it was either crank sensor or Module.No point in replacing one thing and have the other go out shortly after so I replaced them both. Should've died by now,but hasnt so I'm sure its fixed. I've dealt with similar situations before a...
1993 Pontiac Trans Sport SE 3.8L abs
No fix.I tried to get codes whith the help from you who replied but did not get any,checked the sensors could not say that any of them were very different. Customer did not want me to cont. because of the age of the car. Thanks for the Replies!!!
2004 Pontiac Grand Am SE1 3.4L No Start, extended crank VIN: 1G2NF52E34
This one is fixed although it ended up being a two step process. We received 8 replies, everyone of them were helpful. Several said to check the battery and cables which we did. Many said to suspect the ignition switch and after testing everything we could, we... Trouble codes: U1000 (Loss of class 2 serial comm.), U1088 (Loss of SIR SDM comm.), U1128 (Loss of IRC comm.), U1040 (Loss of EBCM/EBTCM comm.), C1298 (PCM class 2 serial data link fault).
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