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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 28, 2008
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Open Help Requests for GM
Help Request Answers
1995 Buick Roadmaster 5.7L Mechanical VIN: 1123568452
This thing will boil over at the coolant bottle when the temp get to about 210-220. Have tested the thermostate. And it was working normal. I left it out and retested it. Same thing. The impellor on the water pump are not rusted away. bypassed the heater core ...
2001 Buick Regal LS 3.8L No Start VIN: 2G4WB55K51
hello buick techs-just wanted to know what im up against on this thing- ive never had this code or problem in my shop before-lites on the dash are blinking like i have the hazards on-relays are clicking under the hood-sometimes it will start and run but then i... Trouble codes: U1040 (loss of ebcm communications)
1995 Cadillac DeVille Concours 4.6L ride control VIN: 1G6KF52Y9S
this concours has had regular struts installed in front eliminating the road sensing struts from factory.it keeps turning on the check ride control message on the dlc center.my question is is there a way to turn off or bypass the message.i found the one on the...
2007 Cadillac DTS 4.6L Stall VIN: 1G6KD57997
hi all i have this car that belong to a good fried the complaint is lose of brakes and accelerator action i think the car cut off and the brake pedal gets hard and hence the no acceleration i have been driving the car for about 3 days with no problems we check...
1992 Chevrolet S10 2.8L guages and diplay VIN: 1GCC1519RX
hello chevy tech,s, this instrument cluster is digital and only displays the speedo. it started out would loose speedo and others stayed working but the speedo would come back but nothing else. question is , is there a fix , or replace cluster? thanks for any ...
1995 Chevrolet C3500 6.5L Cuts out VIN: 1GBJK34F9S
hi iam loosing my mind this truck looses fuel pre when under a load, i have put on 3 ac delco frame pumps, under exceleration the fuel presure bettween the filter & the main pump drops to 0 ( filter is clear )& the presure bettween the frame pump & the filter ...
1996 Chevrolet C1500 Cheyenne 4.3L 1-2 3-4 shift VIN: 1GCEC14W9T
got a 4l60e that has only 2 and 3rd.starts off 2nd and good firm shift to 3rd.ran a external 12 v wire to e terminal on connector from b+.have noticed that the indicator for prnd321 doesnt lite up.i can click the a+b solenoids from outside and hear them well.i...
1998 Chevrolet Cavalier 2.2L ac control VIN: 3G1JC1246W
replaced ac rear defrost switch and wiring harness. since then the ac light is always lit but the compressor goes on and off with the switch. all wires are hooked up correctly. i've seen this before on other cavaliers but this is the first one i have been into...
2000 Chevrolet Astro 4.3L prindle VIN: 1GCDM19W3Y
I need help guys this truck has no prindle it only lights on acc. when watching the scan tool it will only see crank position it will not reconize acc or run. i also noticed no abs lamp or sir lamp. things I tried ecm,bcm,ignition switch,cluster,prindle switch...
2000 Chevrolet Suburban 1500 LT 5.3L lifters VIN: 3GNFK16T5Y
Hey guy's I need a little help. A few months back we rebuilt this 5.3l it comes in last week with 6 lifters sacked out but getting oil. We put a set of lifters in it as it warmed up and started making noise again. We ran with the valve covers off and very last...
2000 Chevrolet Silverado 1500 5.3L 4wd VIN: 2GCEK19T4Y
as soon as you clear the service 4wd light , it immediately comes back and checked all the wiring to the encoder and can't get modis to actuate the switch lights or function of the transfer case. the switch lights wont light up at all now. they did the last ti...
2001 Chevrolet S10 4.3L ltft too high VIN: 1GCCS19W71
Hello fellow techs, First off I want to state up front that this truck is, um, modified. (ok it's a pos)It has no muffler or tail pipe and a cheesy looking hot air induction air intake that has no oil on it.It has air bags on all four corners with no shocks of... Trouble codes: P00, 449B
2003 Chevrolet Silverado 1500 HD LS 6.0L battery VIN: 1GCGK13U23
This truck will boil the auxillary battery in about a months time. The customer states that he has replaced both batteries 4 times in a 4 month period. Customer also replaced the alternator with a reman unit from delco and now a new delco. I have checked the c...
2003 Chevrolet Silverado 1500 4.8L complete sys VIN: 1GCEK19V43
Customer complains that the truck dies randomly under braking or hard turns. He states that there is no rhyme or reason to when it will happen. Sorry about the lack of tests, but he is out of town and wants to bring it in when he gets back next week or so. I t...
1992 GMC Jimmy SLE 4.3L No Start VIN: 1GKDT13W8N
help. got an easy one for you gm guys, im trying to dia no spark condition its got an hei looking 6cyl distributor. checked at coil i got no power to coil and no ground signal when cranking. went in to the module and i can see that my scan tool says 200rpm cra...
1995 GMC K2500 Sierra SL 6.5L excessive diesel smo VIN: 1GTGK29F4S
on start up blows excessive white smoke truck is stick shift after running till hot clears up timing in spec reads 14psi boost at idle on scanner actual 2 lbs plugged in another boost sensor not putting it in intake horn still shows 14 pd boost
1999 GMC Yukon Denali 5.7L blogs down VIN: 1GKEK13RZX
good evenging everyone. truck came in for no power once warm up , check for codes, none found. fuel presure 55 - 60 at sharder valve . clean map air flow sensor. customer had truck at other garages. they did a complete tune up. truck once warm up will not go o...
2004 GMC Savana 2500 4.8L Misfire VIN: 1GTGG25V54
Hi guys, hope someone has seen something similar to this. Van came in 6 mo. ago with bad misfire on #6 and other 3 midle plugs both sides. Performed injector drop test and looked ok. Ran through motorvac twice and misfires quit. Still had idle rougher than i w... Trouble codes: P0174, P3000

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Park Avenue Ultra 3.8L Surge VIN: 1G4CU5310P
This has turned out to be a "simple" problem!!! A lot of very good suggestions from the 20 replys I received. The list of suggestions include MAP sensor, TCC slip, Coil output, crank sensor, TPS, airflow meter,shorting injectors, ruptured fuel pressure reg...
1994 Buick Skylark Custom 2.3L Stall VIN: 1G4NV5539R
I Replaced PCM road tested & stayed in open loop until spprox 165 degrees no stalling..thanks to everyone for you help
1987 Cadillac DeVille 4.1L compressor VIN: 1G6CD1182H
Thanks to everyone who replied. Your input is greatly appreciated. The previous time the A/C would not work, it was due to a bad power module. Due to the cost of a new one, the customer opted for a used one. It lasted about 3 months. This time when grounding t...
2000 Cadillac DeVille 4.6L Cooling Systems VIN: 1G6KD54Y3Y
Eric you were dead on along with bad thermostat that customer installed from autozone removed bolt / bypass and it was stopped up solid and reinstall with delco thermostat and the car has not run hot since thank to all you guys for your help , but some time yo...
1994 Chevrolet Lumina APV 3.8L speedo VIN: 1GNDUO6L7R
Have been waiting for the customer to give me feed back, after pulling the computer down and back probing the output speed sensor wire we drove for 1.5 weeks monitoring the signal and never could get this to act up. I pulled computer connector and tried tighte...
1995 Chevrolet K1500 5.7L parking lights VIN: 1GCEK1XS9K
Hi guys, Just wanted to let you all know we cleaned all related grounds,found unrelated fuse blown & let cust.have truck back,as he didnt want to spend any more money. So far so good!Thanks to all who replied!
1996 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 3GNFK16R9T
Several replies said to do a crank/cam relearn, but neither the snap on scanner or the genisis scanner had that option for this vehicle. Both scanners can do it on other vehicles, so I am not sure that is a possible procedure for this vehicle. We did make su... Trouble codes: P0300.
2000 Chevrolet Corvette 5.7L gauges, windows VIN: 1G1YY12G0Y
I have to close this fix due to time but I do have positive info to post. The cust. travels alot so he will get the car back in after a while but we are very close to a resolution. Thanks to a tip from Richard [...] contacted the cust. and told him to open the dri...
2001 Chevrolet Monte Carlo LS 3.4L engine VIN: 2G1WW12E81
thnks all for your input...after walking away from the car and coming back to it...i test drove it with my nifty carreader tool (WHAT AN INVESTMENT) i noticed, on my computer when i replayed the test drive, checking evey steep (sec) that everytime the car hesi...
2003 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GBHG31U33
2000 GMC Safari SL 4.3L MIL Lamp on VIN: 1GKDM19W9Y
Thanks to all that replied that said the valve and for some of the test info. I had tried all the tests but it was hard to catch it in the act. Finally I did and it was an egr valve internal failure. I had plenty of them go bad but this was a first for an inte... Trouble codes: P00, 405 (egr sensor a circuit low), P0404.
2001 Oldsmobile Alero GL 2.4L no start VIN: 1G3NL52T11
As most of you said, we did replace the ignition switch assembly. After we replaced it we had to perform relearn and car has started fine since. I don't know how they can charge $150.00 for a part that small but car is fix and tomorrow is another day and anoth...
1995 Pontiac Bonneville SE 3.8L No Start, module failure VIN: 1G2HX52K8S
thanks for all the help. the customer has yet to return and allow me to test the coils and wires. i bet they'll be back when that module burns out again.
1996 Pontiac Firebird 3.8L Poor Idle Quality VIN: 2G2FS22K6T
We Did one fuel injection cleaning procedure. Seemed to help. Have not heard back from custumer. Which is usually good. Thanks every one for the great ideas.
2000 Pontiac montana 3.4L Misfire VIN: 2MECM75W5W
we ended up removing cylinder heads for cleaning & new seals. during the process machine shop found 2 bent exhaust valve due to excessive carbon build up on all valves. thamkyou Trouble codes: P0306.
2000 Pontiac Sunfire GT 2.4L Surge, MIL Lamp on VIN: 3G2JD12T3Y
Thanks guys. I rechecked for running lean at idle,found vacuum leak at intake manifold gskt. Found it strange that when I sprayed some intake cleaner in throttle body, it did not really change the idle, but when I sprayed at the intake I could hear the change ... Trouble codes: P0420.
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