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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 18, 2005
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L MIL Lamp on, no communication VIN: 1G4CW52L7R
Hi Guys, I have a buick here and need a bit of input befor I TRASH this pcm and get a new one. I have a check engine light on in this vehicle. I have 3 different scanners and all post no communication. I have checked the basics. I have power for scan tool powe...
1995 Cadillac Seville STS 4.6L cruse control VIN: 1G6KY529XS
replaced pcm due to failing test for p068, then set three more codes, passed for p061, went through testing for [...] time led to check ground ckt 451, checked with headlamp, tested ok, started p062 test 2nd time had different voltage readings at cruse ser...
1997 Cadillac DeVille d'Elegance 4.6L Hard start VIN: 1G6KE52Y9V
This caddy starts hard when cold. Tested fuel system and fuel pressure is in spec cold and hot, and doesnt drop off after hours of sitting. Thinking problem is electrical, and am looking for suggestions on where to start. Car always starts after 15-20 seconds ...
1995 Chevrolet Lumina 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 2G1WN52M75
Car came in with a poor start complaint. It will start and die a number of times, backfires, and snorts. We have found if the alternator is unhooked it will start normal. Hook ALT back up and same problem is back. Tested ALT on our SUN 450 and ALT ripple high ...
1995 Chevrolet K1500 Suburban 5.7L engine temp VIN: 1GNFK16K35
Were scratching our heads on this one- truck came in with an over heating complaint. Customer has not owned vehicle long and has no history. Temp gauge goes to 250-260+ and will drop back to about 210 deg. Engine does not seem to be overheating- scan tool show...
1999 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Stall, Misfire VIN: 1GCHG35R7X
every thing we've done has no effect on miss fire
2000 Chevrolet Silverado 1500 5.3L Heater VIN: 2GCEK19T7Y
Hey everyone, thanks in advance. I have this Silverado with a poor heat complaint. Engine coolant was full, and engine temp. was between 195 and 200 degrees. I replaced the thermostat and coolant and it has real good heat idling in the shop(about 113 degrees o...
2001 Chevrolet Prizm 1.8L Time chain/#1 Cylinder VIN: 1Y1SK52851
GM pro's here ya go. I have this company car driven by a young kid (we all did it too) that now has a noise from the Timing side. The noise is louder under load or revs like a rod knock but is high pitched like a lifter. I have looked at tops of pistons, plugs...
2002 Chevrolet Impala LS 3.8L Extended cranking VIN: 2G1WH55K72
Hi Group, I have this Impala with customer complaint of intermittent extended crank. Before I even had the car in the shop , I figured fuel presure regulator. Well I've checked till I'm blue in the face. I've never seen any fuel and pressure doesn't bleed off ...
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire VIN: 1GCHC29U33
Got a strange one here. This 6.0 truck has a very rough idle and will even sometimes die. Missfires build up on all cylinders while idling but go away once you reach anything over 1400 rpm. The truck has plenty of power and drives fine off idle. We have repl... Trouble codes: P0300 (Random Missfire)
1995 Geo Tracker LSi 1.6L Fuel Gauge VIN: 2CNBJ1861S
Customer just purchased vehicle and fuel gauge operated backwards. when he fills it, gauge goes to empty, as fuel is used gauge goes up. We thought that wiring to sending unit was reversed, we reversed them and gauge pegs above full. Vehicle has approzimately ...
1996 Geo Metro 1.0L Poor Fuel Economy, MIL Lamp on VIN: 2C1MR2261T
Hello all. I have a real gem in the shop today. The car has a service engine soon lamp on and a code of p0335 crank sensor fault. I do not have a shop manual that even has this car in it also the car has had a new engine installed no to long ago. I am using my... Trouble codes: P0335 (Crank sensor fault)
1995 GMC G2500 Vandura 5.7L abs and trans. shifts VIN: 1GDEG25K5S
Hello, any GM techs that have run into this problem.ABS light came on about 1 week after speed sensor at trans was replaced. Also check engine light was coming on.Had history codes 24(vss circuit low), and 72(vss circuit loss).Trans. also has 2nd gear operatio...
1999 GMC Yukon Denali 5.7L Radio VIN: 1GKEK13R1X
Factory Theft Lock am/fm cassette radio with external factory dash cd player stops sound ocaasionally with full display still operational. There was no Bcm recognized by the Mastertech - no Bcm under center console- No codes stored in pcm -Mitchell on demand a...
1995 Pontiac Trans Sport 3.8L MIL Lamp on VIN: 1GMDU06L5S
Mill lamp on with PO321 & P1361 current codes.17 different history codes. Van has no driveability problems. Followed alldata's diagnostic tree and ended replacing ecm & prom. When I clear the codes and cycle the key to the on position I end up with 4 history c... Trouble codes: P0321, P1361 (IGNIITON CTRL TOGGLE ERROR Current Code), VAR10
2000 Pontiac Grand Am GT 3.4L No communication VIN: 1G2NW52E7Y
All of the shop computers will not communicate with the car. Tested all power and grounds at the aldl. Checked continuity at all class 2 data lines that I can find. Disconnected all modules as per alldata. Itappears as if there is no communication at the class...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Limited 3.8L shift lock VIN: 1G4HR52L3S
shift interlock solinoid was bad,It was clicking but was'nt strong enough to disengage
1997 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1G4HP52K3V
I would like to thank everyone who replied trying to help me with this Buick. Unfortantley I was unable to fix the cold start miss and lean code. Fuel pressure was 43 psi, pulse width was 4.1ms, map was 10' hg, compression averaged 158 psi, maf was 2475 hz, lf... Trouble codes: P0171, P0300 (missfire detected).
2000 Buick Century Custom 3.1L Air bag light on VIN: 2G4WS52J7Y
Hello and Thank You to all who replied to my question about this Buick.Allmost all of you said the same thing, to have the BCM reprogramed with a Tec 2.I don't have one at my shop, and struck out calling a couple of other Tecs,So I started calling Dealers.Most...
1990 Cadillac Eldorado 4.5L MIL Lamp on VIN: 1G6EL133OL
hook volt meter to aldl terimals m and a read steady volts at 3.50 should vary o to 5 volts disconected ecm ohm 800 circuits to ecm, bcm, derm,ebcm and dic all ok. replaced ecm, re-ran voltmeter test voltage varys, clear codes road test ok. Trouble codes: E047, B0334.
1993 Cadillac DeVille 4.9L vehicle speed VIN: 1G6KD5281R
I had got a few bad transmissions. All the shifts were commanded. I had the transmission rebuilt and is running great now. SOrry for the late close. I wanted to make sure everything came out right and no other problems were present. Thankx for all your help ...
1995 Chevrolet K1500 5.7L Surge VIN: 2GCEK19K4S
Thank you to all who responded. We did not fix this vehicle, the customer opted to let it go until the problem gets worse. It was so intermittent and so mild that it was sometimes hard to tell if it was acting up or not. I got several replies to this questio...
1996 Chevrolet K2500 5.7L Poor Idle Quality, Cuts out, Misfire, NO POWER VIN: 1GCGK29R5V
I had many replies to this help requist. The replies ranged from mechanical problems, valves seating, valve springs, pushrod problems, distributor cap cross fire, fuel pressure regulator, fuel pump pressure problem, spark plugs, plug wires, but the majority sa...
1997 Chevrolet Blazer 4.3L Hesitation, Surge, MIL Lamp on VIN: 1GNDT13W1V
Thank you for all the help. We dropped the exhaust and test drove and everything was fine. We replaced the convertor and re-installed the exhaust. The final test drive was great. It runs like a brand new vehicle. Trouble codes: P0101, P1406.
1997 Chevrolet Tahoe LS 5.7L Cooling Systems VIN: 1GNEK13R2V
My manager can't contact the owner so we could'nt try anything else. Most replys said to check the heater core. Few said head gasket, cracked head or intake gaset leaking. Sorry that I could'nt verify. Thanks for all replys. If it comes in I will post a fix.
2002 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22GX2
after reflashing pcm and recheck power and grounds, 2 replies stated to check for acid damage in connectors and wiring. the pcm is located underneath battery. battery and cable ends were very clean. did look closely for poor connections in terminals in both pc... Trouble codes: U1016, B2860, P0341, P0336.
2006 Chevrolet Silverado 2500 HD LT 6.6L No Start VIN: 1GCHK23DX6
Thanks for the replies and info . the veh runs good after a drain and flush of the fuel system , also a fuel filt. change .just needed to verify that we didnt need to do more repairs thanks again
1989 GMC K1500 Sierra SLE 5.7L master cylinder? VIN: 1GTDK14K1K
Many thanks to all 17 who replied with advice. David from Ohio wins the big Cigar this time with information about the quick take up valve in the master cylinder and that just blocking the ports and checking for a hard pedaal is not a valid test on this one. T...
2005 GMC Yukon SLE 5.3L engine VIN: 1GKEK13V85
The fix was the replacement of the engine. The block needed line boring. No one would touch this block. There was no question that the block was bent/twisted.Everytime we tried to tighten # 5 main, the engine would become very stiff. The new engine was easy to...
1997 Pontiac Grand Prix SE 3.8L Cuts out, Stall VIN: 1G2WP55219
Well, I think it is time to call this one fixed. Faulty crank sensor appears to be the culprit. Received many replies that suggested Ignition module, wiring issues and ignition switch. Tried replacing ignition module, but this did not cure the problem. Inspect...
2002 Pontiac Grand Prix SE 3.1L Heater Box VIN: 1G2WK52J82
Thanks for all the quick response to my plea for help. I think it is fixed, it passed our test in the shop. We glued (weater stip adhesive)the OE seal under the wiper cowl back in place and put a bead of black silicone under the the wiper (cowl) cover as most ...
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