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Prev Professional Automotive Repair Technical Discussions for April 13, 2010
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Open Help Requests for GM
Help Request Answers
1994 Buick Regal 3.8L drive belt VIN: 2G4WB15L4R
This car came in with a belt squeak, we replaced the belt and idler pulley. Then came back with squeak again and replaced belt again. Came back again for same problem we put on a slightly smaller belt. Came back again with same problem, suspected tensioner not...
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L0R
this car has been in and other techs have been in it for intermidate no start stalling couple pcm and module replaced when i got to it no scanner comm and cooling fans running checked all powers and gounds fans will sometime just click relay and car will start...
2003 Buick Park Avenue 3.8L starter VIN: 1G4CW54K93
car came in with the 5 amp crank fuse blown, hence a no crank condition. checked all the wiring/connections, everything looks ok. tested the circuit to find it only drawing 5 milliamps at the fuse. this fuse powers the bcm and pcm. anyone have any reason that ...
1993 Cadillac DeVille 4.9L inst panel VIN: IG6CD53B4P
digital Inst. panel, radio and a/c controls dont light up. they light up briefly when starting vech., and than go out. fuse # 4 (radio, body control module) has no power to it. replaced ignition switch, but still no power to fuse #4. I jumped ignition power to...
1995 Chevrolet C1500 5.7L Hesitation VIN: 1GCEC14K8S
truck came in with lower end knock cust wanted a reman motor put in ran great just had lower end knock swap engine and now the truck starts right up idles just fine but put it under a load and it acts like the exhaust is plugged. check timing/ fuel pressure/...
1997 Chevrolet K2500 Silverado 5.7L Fuel Guage problem VIN: 1GCGK24R2V
Hey guys, My problem is with the guage. It fluctuates alot while driving or stopping. I red the TSB NO 76-83-05. But it states the tank has to be half full or less. And the dealer wants alot of money and it's across country for the anti slosh module.I can get ...
1997 Chevrolet Blazer LS 4.3L interior lamp control module VIN: 1GNDT13W5V
Interior lights will not go off, key in ignition chime runs continuously with vehicle running. I have disconnected the door latch switches in the drivers door, no difference. I have been unable to locate the "interior lamp control module". I have a "remote fun...
1997 Chevrolet C3500 7.4L No Start VIN: 1GDCHK33J2
Truck will start as long as the fuel pump pressures up, but evry once in a while the fuel pump will not pressure up or even opperate unless you cycle the key a few times, then the truck will start imediatley Any help would be appreciated thanks to all.
1998 Chevrolet S10 ZR2 4.3L brake line VIN: 1GCCT14W8W
Hi guys, I replaced the brake line to the rear of the vehicle and tried bleeding the brakes numerous times but I can not get any pressure to the rear brakes. Master cyl was empty when the customer dropped the vehicle off so I bled the master cyl as well. Stil...
2001 Chevrolet Silverado 2500 HD 8.1L Hesitation, Cuts out VIN: 1GCKE29G31
I have this 2001 Chevy 2500 HD with the 8.1 L Gas engine that is giving us problems! When COLD first start for the day it runs bad on accel. It only last a few seconds and once it takes off it will be fine for the rest of the day. The fuel pressure is picture ...
2002 Chevrolet Impala LS 3.8L No Start VIN: 2G1WH55K02
Have this Impala which came in as in intermittant No start. When the car got here it would not start. No crank, good battery. Found no power at S-terminal on starter. Scanned for codes. No P codes, but had 13 misc, B codes. I checked all grounds that I can fin... Trouble codes: B2618
2003 Chevrolet Silverado 2500 HD 6.0L steering pump VIN: 1GCHK29U73
In January this truck came in with no power steering or brake assist. The pump had been noisy for some time. I replaced it with a rebuilt Cardone pump and after about 3 days it too failed. This time it was a broken shaft. The truck worked well until yesterday ...
1990 GMC K1500 Sierra SLE 5.7L pcv system VIN: IGTDK14K2L
I have this Rebuilt Long Block installed and makes a scritching / wistling noise when running, that goes away when pull dipsctick out, I did check engine vaccum and is 19-20 Inc/hg, pcv valve hose also shows 19-20 psi, pull out T/body & vaccum ports are free, ...
1997 GMC C1500 Suburban 5.7L transfercase VIN: 3GKFK16R9V
this is a 243c transfer case and the customer brought in with complaint that for about three weeks after it has set over night it will be in 4 high and 1 time it was in 4 low after startup ,,this has the older tccm in it where u have to ground pin 13 on the dl...
2001 Pontiac Grand Am SE 3.4L Surge, dies out VIN: 1G2NF1ZE21
We posted this in another section and had 2 problems. A lack of oil pressure once warmed up and a severe knock. Also, the engine would die out. Once that knock was corrected the severe knock was gone and pressure was correct. But the engine still dies after ab...
2004 Saturn Vue 2.2L cooling fan
customer comes in to the shop cooling fan at the radiator not working. traced the problem to the fuse box (12 volts out of the relay at the relay terminals but only 4.2 volts at the connector on the bottom of the fuse box). disconnected the fuse box put 12 vol...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Stall, Poor Fuel Economy, Fuel flooding plugs VIN: 1G6CD5336L
The vehicle is still here and not yet fixed. It is on the "back burner" for now due to the recent flooding here in MA and a few other problems. So far the response has been overwhelming to do the ground repair near the starter.I have done this and repaired...
2001 Cadillac DeVille 4.6L Cruise VIN: 1G6KD54Y01
Thanks to Lewis, Chris, Doug, Paul, and Steve for the replys. Lewis led me to This is a search that goes to the web of salvage yards. I got several replys from them all that had the servos in stock, price and warranty. The customer opted for th...
1986 Chevrolet C20 Silverado 7.4L valve lifter
Dave Hasen from AERA told us about MIZPAH Machine that can rebuild the lifters we have, a couple of others mentioned shops that do the same work. Seems that is a common procedure for older aviation engines. Problem was that after measuring them, we only had ...
1997 Chevrolet K2500 7.4L Poor Idle Quality, Surge VIN: 1GCGK29J1V
I want to thanks all who replied .The plan is to replace the fuel pump as most of you said.I had a heart attack 2 weeks back and have to go back in to get some more repairs made this Thursday.When I get back to work I will swap the pump and re-post if there i...
1999 Chevrolet K2500 Suburban LS 7.4L Long crank hot start VIN: 1GNGK26J7X
The fuel pressure regulator was the culprit! The vac hose did have fuel in it. Unfortunately, the coil, upper intake manifold, distributor, and fuel rail have to be removed for access to the FP regulator! But it was bad, and replacement solved the problem. All...
1999 Chevrolet C3500 6.5L Excessive Emissions, Stall VIN: 1GDKC34F6X
Thankyou for all of the replies, a lot of great help here. I cleaned the tanks, changed the lift pump and fuel filter. I suggested to the customer that it would not help anything but he wanted to do it anyways. I drove it and almost immediately it died again. ...
2000 Chevrolet Suburban 1500 LT 5.3L blend door VIN: 3GNFK16T0Y
Thanks to all for the help. The Tech replaced the blend door actuator. Seems the "ever since you worked on it" bug can even bite a Tech's wife!! Greg and crew
2005 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, MIL Lamp on VIN: 1GNDT13S15
What I found was that the problem was heat related. With the help of Identifix, I checked the crank signal at PCM DkGry connector pins #1 & #9. The waveform was good sine wave. Then I checked the circuit out to the IPC Blue connector pin #49 and when the probl... Trouble codes: P0300 (Random Miss), P0410 (Secondary Air), P0622 (Gen F control).
2007 Chevrolet Malibu LS 2.2L MIL Lamp on, hard to fuel up VIN: 1G1ZS58F47
Well the lady called two times and said she is not coming in cause the light is not on and it is taking gas. I told her it will most likely do it again most often problems just dont go away. She said if the mil comes back on or the car wont take gas then she... Trouble codes: P0446.
2007 Chevrolet Silverado 2500 HD LT 6.6L No crank VIN: 1GCHK236X7
Thanks to all that responded!!! I posted on a Friday PM after I told the owner (my landlord) I could take care of it & go ahead & tow it here. OOPS! So no truck for weekend. I checked more circuits on the following Monday looking for something that might tak...
2004 GMC Envoy XUV SLT 4.2L guages,i/plights VIN: 1GKET12S74
this is not a fix cause the customer is going to trade in vehicle.thanks for all the replies.i'm sure it was the cluster.thanks again!
2001 Pontiac Aztek 3.4L cluster VIN: 3G7DA03E61
started looking at the BCM and its under the center concel (sp?) right below the cup holders. seen spilled coke/drinks. the conecters where sticky, cleaned and reinstalled and no more trouble so far, but did tell the owner if it starts acting up will replace t...
2001 Pontiac Grand Am SE 3.4L engine noise/dies out VIN: 1G2NF1ZE21
While I have not totally repaired this one we did correct half of the troubles. At the onset, we did not realize that we had 2 troubles. One the die out and second a knock from lack of oil pressure. The oil pressure and knock has defenately been corrected. Alm...
2001 Saturn L300 3.0L Cuts out, Stall VIN: 1G8JW52R51
Thanks all for the help. The throttle body was SO gummed up that it was holding the throttle plate open 3 degrees... Cleaned the body, and it was mint. Thanks again.
2005 Saturn Relay-3 3.5L power sliding door VIN: 1GZDV23175
I'm going to tentatively call this fixed!?!? Props to Rob [...] and all the other GM Techs who helped on this. I pulled the #21 and #25 amp fuse and did a relearn. Has been working fine for at least 6 hours. I'm shipping it with a blessing. Thanks guys...
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