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Prev Professional Automotive Repair Technical Discussions for July 21, 2009
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L oil pressure lite VIN: 1G4HP52K7V
Heres the story, car came in for leaking intake gasket. Put new gaskets on and checked to see if the intake was burned like all the rest and it was good so we put it all back together. Car starts up runs great.We take it out for a test drive and tech comes bac...
1998 Buick Park Avenue 3.8L Lighting VIN: 1G4CW52K0W
Hello, I am trying to find a location for the turnsignal flasher...mitchell says it is behind dash right of carrier but I have the whole thing apart and can't seem to find it anywhere..Anyone know where this thing is located?
1989 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1YY2180K
Hey Corvette Specialist. I got a 1989 Corvette won't Idle when its cold. I have replaced the HEI, IAC and ECT. I also check if it has a cold start injector but All Data said its Computer control. It doesn't IDLE when its cold. But when its HOT its start right ...
1992 Chevrolet C1500 Cheyenne 5.7L limp mode VIN: 1CTF2C4K2N
First we are not a transmission shop.But he is a good customer. This is a OBD1 system snap-on brick and also OTC scanner won't link up to ecm. So we have trouble from the start.Customer stated the trans was rebuilt for a harsh shift condition. after it was bui...
1994 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1GCGK29F7R
i am trying to time this engine. customer installed engine and wanted me to time it. when it came in had code 34 - stepper motor fault and codes 91-98 cyl. balance faults. injection pump is off to the drivers side, so that the pmd is almost touching intake. tr... Trouble codes: 34 (stepper motor fault), 35 (injection pulse width error), 88 (tdc offset error), 9198
1997 Chevrolet K2500 Suburban LS 7.4L engine VIN: 3GNGK26J5V
Client was driving the vehicle stalled coming to a stop, would not restart. Was hard to start intermittently previous mornings but was otherwise okay under load, may have been popping through the intake on starting he's not sure. I repaired two grounds near th...
1998 Chevrolet C3500 Cheyenne 7.4L No Start VIN: 1GCBJC34J8
vehicle has no spark Trouble codes: P0336
1999 Chevrolet S10 4.3L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCCS14X3X
AllData, as far as I can tell, has decided not to put information about cars in there product anymore! I could find no resistance-temp chart to test this IAT sensor in the SomeData. :-( Does anyone have a chart? I was also looking up a time belt labor in the ... Trouble codes: P0101, P0300
2000 Chevrolet Camaro Z28 SS 5.7L Alternator VIN: 2G1FP22G4Y
I have been having an intermittent problem on my Camaro for the past year or so. When I rev the engine, whether it be driving, or stopped, the alternator stops charging. Tested the alternator and it fails. I have been through over 10 Alternators with this car ...
2001 Chevrolet Monte Carlo SS 3.8L No Start VIN: 2G1WX15K31
Three weeks ago car came in for random no start. Checked for codes P1189,P1626 Theft deterrent fuel enable signal lost,P1546 and,P1811. Replaced oil pressure switch for the P1189. Car started and ran good for three weeks until July 15 towed car in would not st... Trouble codes: P1546 (A/C clutch control relay circuit), P1811 (Maxium adapt long shift), B2960 (Passlock cylinder Data incorrect), B2964 (Key-in ignition circuit high), B3031 (Security system controller in learn mode), B3128 (Driver door unlock output short to battery)
2001 Chevrolet Malibu 3.1L Over Heating VIN: 1G1ND52J61
Car came in due to over heating. Coolant temp was disconected to keep fans on all the time.Pluged ECT back Fans would not come on even temp is above 100 deg c. on scantool for Coolant Temp. Now if use scantool to turn the fans on its works in both low and high...
2001 Chevrolet Silverado 2500 6.0L No Start VIN: 1GCEK19TO1
hello techs customer called with no start i diagnosed it as bad starter customer replaced starter cranks over now but no start i went out and diagnosed again it has no spark no codes no injector pulse fuel presure at 60 psi im thinking cust. may have broke the...
2007 Chevrolet Suburban 1500 LS 5.3L all lighting,alarm systems VIN: 1GNFC16067
Hello all, here is my dilema - this vehicle is an '07 but '06 drivetrain, manufacture date of 05/06. Several TSB's list tranny connector at fault, this vehicle does not have that transmission style connector. All powers and grounds to BCM good. What happens is...
2007 Chevrolet Tahoe LS 4.8L abs VIN: 1GNFC13C27
This system is new to me. I have a 2007 Tahoe setting C0040 RF Speed Sensor Circuit. The customer says he went and got new tires, no problems going in. When he left the Brake and ABS lights were on. The DIC says "Service Traction Control System" Alldata says ...
2001 GMC Savana 1500 4.3L MIL Lamp on VIN: 1GTFG15WX1
vehicle has codes for rich bank 1 and 2 in checking fuel pressure I have 65 and it holds to 50 checking 5 mins after shut down when you run the vehicle it is running rich for sure I have a long term adjusment of -20 .. sometimes while you are driveing it will ... Trouble codes: 172 (fuel rich bank 1), 175 (fuel rich bank 2)
2003 GMC Yukon SLE 5.3L Computers VIN: 1GKEK13Z13
This GMC initially came in to the shop for a no A/C concern and after we located and repaired the leaks and recharged the system we had no a/c clutch operation- so after cking the fuses and wiring we went to the scan tool and Waa Laa- NO COMMUNICATION with any...
1991 Oldsmobile Cutlass Calais 2.3L Misfire VIN: 1GCDMKLOHM
Have this calais on my bay came from a different shop, after they mess with it for 4 months (on and off)car would not run, found defective ignition module (IDM), replaced it and both ignition coils, got the car to run. When cranking sound like out of timing, a...
2004 Oldsmobile Alero GL 2.2L Passlock VIN: 1G3N152F14
Hope you guys can help. Car came in cranks no start with security light flashing. Scan system no codes stored. reprogrammed passlock and car started. Customer picked up car and everything was ok for two weeks and car came in on the hook for same problem, again...
2006 Other GM WORKHORSE 6.0L MIL Lamp on VIN: 5B4JPD2UX6
The fuel level sensor fault comes back each ignition cycle. The scanner is reading 4.9 volts. When you back probe the sense wire at the sending unit it reads .7v also if you back probe at the computer it reads .7v The evap pressure reads 1.4v back probing at t... Trouble codes: P0452 (evap pressure sensor signal low/ short), P0463 (fuel level sensor circuit open / high), P0522 (engine oil pressure sensor circuit signal low), P0711 (trans temp sensor circuitout of range), P0200 (injector circuit problem)
1991 Pontiac Grand Prix SE 3.4L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2WJ14X3M
I am begging for everyone's help on this one! I have has this problem child for a while now and it is at the point where I need to solve this car soon before I lose what sanity I have left. This car has had a engine rebuild done by myself about a year ago. I h...
1997 Pontiac Sunfire SE 2.4L Poor Idle Quality, Cuts out, Misfire VIN: 1G2JB52T2V
vehicle came in for runs rough condition. problem is intermitten but appears to be worse under load. we have recreated the condition and it fells like a major misfire. we tested all ignition and fuel componets and found no problems. there is no codes in the pc...
2006 Pontiac Wave 1.6L loss of power VIN: KL2TD69636
Hello fellow techs Lady states it losses power only on the hwy after getting stuck in traffic. 1st 2nd and 3rd gears seem ok but once in 4th or 5th will not accelerate past 50 km an hour. A/c not on.Might go a week without a problem.I have not felt this proble...

Fixes & Summaries for GM
Fix/Summary Answers
1981 Chevrolet Malibu Classic 3.8L No Start VIN: 1G1AW35K6B
thanks to all that replied, took a few days to finally figure this one out. Although i had spark i wasnt getting enough replaced dist cap,igniton rotor, plug wires, plugs and vehicle started right up. so again thanks to all that helped.
1989 Chevrolet Cavalier Z24 2.8L Cuts out VIN: 1G1JF11WXK
Thanks for all the helpful suggestions! After digging through alldata I was able to find a spec chart for injector resistance which varies wildly depending on the different GM setups. These were listed around 12 ohms. I ohmed out the one we replaced already, 1...
1998 Chevrolet Tracker 1.6L No Start
It's fixed!!! I had several problems. One was my fault. When I reinstalled the belt I did not notice that there were 2 timing marks on the cam sprocket. Once I found one I quit looking! And of course it was the "I" mark. I should have lined it up with the "E...
1998 Chevrolet Malibu LS 3.1L relay junction block VIN: 1G1NE52M4W
Well, it`s gone fan do what ECU tells them to do so things are fine for now. I cut the wires coming from ECU to Junction box, and rewired them to 2 external relays with their own external fuses. Donít know if car have some kind of immobilizer inside junction...
1999 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W6X
thank you all so much for your suggestions. Some of you said to check the CAT, i haddent thought of that. Some others said to check the wiring to the PCM and the PCM itself. I've had others of these leak and did not know that could happen. Good thing to know i...
1999 Chevrolet K1500 Suburban 5.7L Poor Idle Quality, Misfire VIN: 1GNEK13R13
1999 Chevrolet Monte Carlo Indianapolis 500 Pace Car 3.8L Excessive Emissions, Stall VIN: 2G1WX12K6X
first sorry for the delay. customer went out of town. found cracked vacuum hose and replaced. rechecked vacuum readings now at 22 in hg, fuel pressure koeo 52 psi. koer 42 psi. back pressure at idle 0 psi at 2500 less than 1 psi. thanks to all who helped with ...
1995 Pontiac Grand Am SE 3.1L Starting VIN: 1G2NE55M9S
I believe we figured it out. The customer had a remote start installed some time ago and it worked great. We were concentrating so hard on the PCM fuse we missed some good clues right under our nose. I have put together a list of events that happened at differ...
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