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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 1, 2004
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L blower motor VIN: 1G4CW52LXR
The blower motor is running at all times with the key out of the ignition. I cannot find any electrical diagrams on the blower control module or relay location
1995 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K9S
Hello all, This has been a true alligator of a car. Came in with symptoms of runs rough, stalls at idle, misfires on accel. Pulled codes and found 0321 & 1361. With engine running, when problem occurs tach and charge meter become erratic. Disconnecting alter... Trouble codes: 321 (Spark reference signal missing), 1361 (IC circuit grounded)
1995 Buick Roadmaster 5.7L fan operation VIN: 1G4BN52P0S
When any command is pressed on the electronic console in the dash, one can hear the various vacuum motors moving to their assigned positions. The unit can be in "auto" mode or "auto vent" or manual and there is no fan. All fuses and relays are good.I just can'...
1997 Buick Riviera 3.8L horn VIN: 1G4GD22K0V
This vehicle sustained (very) minor damage to the left front area. Some time after the repair, the owner says the horn is sounding constantly and the fuse had to be removed to silence it. TThe Buick dealer tells me the problem is the horn "contacts" which are ...
1997 Cadillac DeVille d'Elegance 4.6L head lights VIN: 1G6KE54Y3V
sometimes the headlites work others not , replaced sw and body mod... its very spiratic ... please help ...
1998 Cadillac Seville STS 4.6L Long cranking time VIN: 1G6KY5495W
This 98 STS has an intermmittent no start condition. Hot or cold cranking times can be as long as 30 seconds. Once the vehicle starts it runs fine. Both crank sensors & cam sensor ok on lab scope but we have not been able to get the problem to occur with equip...
1986 Chevrolet S10 Blazer 2.8L Hesitation, Sometimes backfires VIN: 1C8CS18R8C
Morning folks, another beautiful day in the neighborhood. Got a strange one it seems. This blazer came in running bad cold, hesitation. Checked codes (see list below) and found a bad pigtail on the coolant temp sensor (read -41). Replaced pigtail and read fine... Trouble codes: 44 (Lean Exhaust), 24 (No VSS Received), 15 (Coolant Temp Sensor High or Open), 33 (Map Sensor or Circuit Open or High), 32 (EGR System Problem)
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G1YY2181J
Hello all, I have a Corvette I'm having some trouble diagnosing. The complaint was that the Service Engine Soon light was on and the vehicle was cutting out. I pulled codes 44 lean exhaust and 33 MAF signal high. As I watched the data stream, I noticed that th... Trouble codes: 44 (lean exhaust), 33 (maf signal high)
1988 Chevrolet Astro 4.3L Power steering pump VIN: 1GDDM15Z4J
This vehicle had originally been brought in for a power steering fluid leak. I had found that the power steering pressure line was broke off right at the power steering pump. I replaced the power steering pressure line and return line and returned the vehicle ...
1991 Chevrolet Lumina Euro 3.1L a/c ecm VIN: 2G1WN54T9M
I need some GM help, this year my wife tells me that her air is not cold so I put my gauges on it to find that it still has a full charge. the a/c will not engage at all I jump the relay and works fine, I show freon low yes on my otc scan tool. I replaced the ...
1993 Chevrolet S10 Blazer Tahoe 4.3L Cuts out, Stall VIN: 1GNDT13W1P
4.3 Engine will idle for a few minutes then stall.When it stalls out it still has spark but no pulse width .If I spray carb cleaner into intake it will run for about a minute befor stalling out again.We replaced the computer just because the owner had a spare ...
1993 Chevrolet P30 7.4L Fuel gage VIN: 1GBJP37N1P
This motorhome has an erratic fuel gage. Came in 2 months ago with same problem. Dropped tank and found one of the lines on the sending unit was rusted and broke off its weld. Replaced sender which came with new pump. I did not notice any fluctuation, all seem...
1993 Chevrolet Lumina APV 3.8L Cuts out, Stall VIN: 1GNDU061L7
Hello techs this vehicle came in with these codes 47,56, 61.I cleared them and they come on as soon as I start it. The 47 uart link problem I cannot find any info for in Mitchell or Modus. under hc 56 and 61 are still there instantly after I start it too. then... Trouble codes: 47 (uart link problem), 56 (qdm 2 problem history code), 61 (cruise control vent history code)
1994 Chevrolet K2500 Cheyenne 5.7L ign switch elec VIN: 1GCGK29K4R
Have you seen this? Truck will not turn off with key, and dash lights stay on, Like during key on engine off. I think it might be a diode in the harness, but wanted to see if someone has been there. I've cleaned green off battery and some connectors. Problem n...
1999 Chevrolet Express 3500 6.5L runaway idle VIN: 1GCHG35F3Y
If any GM tech could assist, I could use deisel help. Like most of us do,I'm helping a freind with this case. He's the Tractor Trailer shop next door and has bailed me out before. #1 Truck smokes like crazy but Runs good-(DSL smoke) #2 Idle will RUNAWAY to ...
2000 Chevrolet Impala 3.4L Fuel tank VIN: 2G1WF52E7Y
This car was brought in with the customer saying it would not take fuel through the filler tube. I lowered the tank and found nothing strange except for the filler vent hose had a slght kink in it but it didn't look bad enough to cause this problem. So I disco...
2000 Chevrolet Express 3500 5.7L No Start, Cuts out, Stall VIN: 1GBJG31R54
no service engine soon light on when turning key on, code p1361, towed in stalled on highway no start, started and running fine, fuel pressure 60 psi, has new ac delco fuel pump and filter, added ground to fuel pump previously for no start, is there problems w... Trouble codes: P1361
2002 Chevrolet Tahoe LS 4.8L MIL Lamp on, spark knock VIN: 1GNEC13V42
the vehicle runs ok going down road but at a idle the valves raddle and spark knock can not brake torqe the vehicle it is like the timing is retarted does same thing when vehicle is under load.tried another computer but the dealer could not get in the prom to ... Trouble codes: P0106
2003 Chevrolet Tahoe LS 4.8L Front end, steering column VIN: 1GNEK13V53
Intermittent audible knocking noise that you can feel in stearing wheel on sweeping turns at slow to intermediate speeds. Front end parts all check out OK, vehicle has low mileage. No TSB'S found in Mitchell. Heard same noise in other GM Tahoe's and Yukon's 20...
1995 GMC Pickup K3500 6.5L speedo
thanks in advance for any help. local trans rebuilder got this one w/burnt fluid, hunting,erratic shifting, and no 4th speed. rebuilt transmission, all symptoms the same except burnt fluid. i got the truck to try to bail them out. i noticed that the speedo did...
1994 Oldsmobile Cutlass Ciera 3.1L clock illumination VIN: 1G3AG53M8R
since alternator was replaced, radio clock light stays on and drains battery. tried battery disconnect to no avail.
1995 Oldsmobile Cutlass Supreme SL 3.1L Cooling Systems VIN: 1G3WH52M7S
Hello, I stumped on this one please help. This olds with a 3.1 use's oil 1-2 qts. every 400-500 mile.Car runs fine it seem like alot of the oil is getting mixed in with the antifreeze. I did pressure the cooling system i didnt see any leaks.I have done alot of...
1999 Pontiac Grand Prix GT 3.8L Surge, Poor Fuel Economy VIN: 1G2WP52K4X
cust. complaining of noise in eng. and surge pulled off oil fill cap, valve covers have alot of vacuum and car wants to die with cap off. lift the cap off slightly and noise goes away

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Regal 3.8L Mechanical VIN: 2G4WB12L3S
Thankyou for all the replies. We are really appreciative for the IATN and all you mechanics out there who are willing to reply. Right after I had sent this help request in I found the leak, it was coming from the timing cover gasket. I never ran into one these...
1997 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K2V
Thanks for all of the replies, you guys were a great help, most said that it was fuel related and to check the injectors (cyls 3,5 had lower flow rates approx 6 psi at full pulse) and clean or replace the suspect ones, the customer decided to have the injector...
1955 Chevrolet belair 327CID booster VIN: VC55006816
Thanks to all who responded. I found a stainless dual diaphram booster on ebay new and cheap. I used a (new) early truck master (looks like a corvette master) with the residual check valve for my rear drum brakes. Ebay supplied the drop spindles with cast in c...
1988 Chevrolet C1500 Cheyenne 5.0L Hesitation, Surge VIN: IGCDC14H9J
I called this fellow about his truck. He says a friend of hie told him his problem was a temp sensor ( I pulled no codes on my scanner ). So he is going to fix it himself. Fine with me as I was not going to charge him anyway. Thanks for all the help. Dan
1989 Chevrolet K1500 Cheyenne 5.7L No Start, Poor Idle Quality, Cuts out, Stall, Misfire VIN: 2GCEK19K3K
thank you, very much. we got 23 replies and 12 of them were right on the dot, we had a dist,with a bad pickup coil and shaft . we replaced it w a known good unit and it ran great. so we sold the customer a a/c delco new dist assy, he was happy and we were glad...
1995 Chevrolet C2500 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GCGC29N35
Thanks to all of the folks that replied to my message!!! The fuel pump that another garage installed was the wrong pump!!! I installed a gm oe replacement and cured the problem.I also repaired a very weak splice made to the ground wire for the fuel pump.I woul...
1996 Chevrolet C1500 Suburban LS 5.7L MIL Lamp on VIN: 1GNEC16R9T
Turns out someone did an intake on this vehicle and routed the vacuum line wrong, a little replumbing and now all is good Trouble codes: P0441.
1997 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R9V
Thank you to those who replied to my request. After reading these responses and doing some further checking I came to the conclusion the egr valve was the problem. After replacing the valve there have been no problems. Thanks again Chad Trouble codes: P1406 (auxilary emissions malfunction).
1996 GMC Jimmy 4.3L No Start VIN: 1GKDT13W6T
Thanks to all the responses. In the end, Christopher from California hit it right on the head when he stated that I needed 60 p.s.i. of fuel pressure to make it run. Other sources had stated that 49 p.s.i. was minimum, so I thought that I was o.k. with 55.I ho...
1998 Oldsmobile 88 Royale 3.8L Misfire, MIL Lamp on VIN: 1G3HN52K7W
She is fixed. I want to thank everyone for taking time to respond to my dilemma. In my original post I was leaning towards an internal vaccuum leak and was wanting everyone to agree with me. Looking at my fuel trims and shorter than normal burn time on #6, I w... Trouble codes: P0306.
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