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Prev Professional Automotive Repair Technical Discussions for November 27, 2006
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start, NO PCM COMMUNICATION VIN: 1G4HP52L1R
Thanks for any input on this strange one! Customer brought car into us complaining of not being able to start the car twice at church. She said it cranks okay, but would not start after tring 2-3 times. She then went back into church waited for a tow truck and...
2000 Buick Regal GS 3.8L multipal sys VIN: 2G4WF5518Y
this car came to us for rear brake grind ,replace brakes customer picked up vehicle next day customer returned asking us to tighten his battery cables because his car failed to start at bank he claimed he left the cables loose from his home battery install/tig...
1996 Cadillac DeVille 4.6L No Start VIN: 1G6KD52Y3T
Car came in with a no start and theft deterant problem car may not restart message on IPC.Could not communicate with any computer on class 2 data line with TECH 2 or IPC.Diagnosis is to unplug all modules and check data line for ground or short to power,both O...
1990 Chevrolet Camaro RS 3.1L Hesitation, Cuts out VIN: 1G1FP23T1L
hi guys, i got this camaro in my shop that was barely running. when it did, black sooty smoke out the tailpipe and loading up like crazy. customer informed me that this car sat for some time. anyways i changed the plugs, oil, map sensor, o2 sensor, distributer...
1995 Chevrolet Lumina LS 3.4L distributor blockoff VIN: 2G1WN52X0S
Help!!Distributor blockoff is leaking oil..can't be repaired without removing head?anyone know any shortcuts to replacing o-ring on this thing?removed plenum and intake,pulled assembly out as far as I could,not enough to get to o-ring..tried rtv,still leaks.is...
1996 Chevrolet C1500 5.0L Misfire VIN: 1GCEC14MXT
This vehicle came in with multiple misfire codes and was in dire need of a tune -up due to the lack of any preventitve maint. original spark plugs evident arcing on many wires etc. Naturally thinking this would be and easy in and out tune up it has become the ... Trouble codes: P0305 (misfire 5 cylinder)
1998 Chevrolet K1500 Cheyenne 5.7L battery isolator VIN: 2345678901
Hi all, I would like to get some ideas (experience results) on electronic battery isolators. I would like to choose a unit that if it fails, alternator will still charge the main battery. Also unit will not have much voltage drop (heat up) and voltage spike....
1999 Chevrolet Malibu 3.1L under intake manifold VIN: 1G1ND52M6X
I noticed a small puddle of coolant at the rear of the engine under the intake manifold. I cleaned it up and put 15psi into the coolant reservoir tank and it dropped to 14psi and held for over 30 minutes and I found no leaks. Took car for a 5 mile test drive a...
2001 Chevrolet S10 2.2L engine noise VIN: 1GCGS14571
ok chevrolet people, i need your help. vehicle came in with what seems to be a rocker arm noise (top end, right in the middle of the engine) removed valve cover for inspection, all tight. figured it was a lifter, removed head, sent to machine shop for complete...
2002 Chevrolet Camaro Z28 SS 5.7L No Start VIN: 2G1FP22G02
car towed in no start. fuel pressure perfect. no spark no inj drive. master tech reads crank rpm then all of a sudden starts right up. then right then right back to crank & no-start Trouble codes: P1626
2003 Chevrolet Trailblazer North Face 4.2L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13S73
Hi everybody this one has me twisted. Checked data stream and everything looks normal. vehicle holds back under accel. The more gas you give it the more it holds back. I actually got the vehicle to slow down going down hill while accelerating. There are no tra... Trouble codes: P0171, P0172, P1171 (fuel system lean during accel.), P0300
1984 GMC C-7000 7.0L No Start VIN: 1GDJ7D1E8E
This one's for all heavy truck mechanics. Truck lost all power and no spark is evident after multiple checks of the primary and secondary ignition systems. I found only two strands of 16 ga. wire attached to the "TACH" terminal at the HEI cap and repaired. No ...
1999 GMC Yukon SLE 5.7L 4-2 cut loose VIN: 1GTEK19RSY
First let me say thanks in advance for your time reading this post. Vehicle downshifts to second gear accroding to scan tool data, above 60 mph hard accel 3/4 throttle and above, just revs to rev limiter until you back off throttle, then catches third gear, ow...
2000 GMC C6500 7.4L MIL Lamp on VIN: 1GDJ7H1D3Y
This truck illuminates MIL w/ P1221 and P1120; also will default to limp-in and illuminate "POWER LOSS" light when code sets. I have very limited data for this vehicle. What I do have tells me that P1221 must be addressed first. Neither of my scanners will p... Trouble codes: P1120 (TPS 1 less or greater than calibrated value), P1221
1998 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3H52KXW4
car died found that there was no fuel pressure checked voltage at pump was 12.2 ground check ok i replaced pump and sending unit and fuel filter ran good came back 2 day later with same problem. OK bad napa fuel pump replaced pump again 2 days later back again...
1999 Oldsmobile 88 Royale 3.8L Poor Idle Quality, Stall VIN: 1G3HN52K1X
This vehicle originally came in with stalling at stop and ses light is on. We found two tps codes. Tps measured .33 at idle. Tps was replaced and now measured at .45. Car test drove well and was returned to customer. Three days later car is back with ses light... Trouble codes: P0122 (p1107-), P1107 (p1122-), P1122 (testing and results)
1997 Pontiac Sunfire SE 2.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G2JB1246V
As i stated #1-#2 injectors were leaking with a customer complaint of gas smell. Replaced #1-#2 injectors with new ones. Engine automatically developed misfire on #3-#4 Cyc. After a Hmmm. Swapped #1-#2 To #3-#4 Vise-Versa. Engine Miss went to #1-#2. Got two ne... Trouble codes: P0172

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G4GD2219S
hello fellow techs i'm closing out this tech mail with no answer so far all the help offered has not fixed this car yet. although all the advice i recieved was helpful it did not fix this cars problem thanks to all who replied & when i find this answer i will ...
1997 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52MXV
First I would like to thank everyone that replied to my request for help. We did find a problem with the engine vacuum in that the valve adjustment was tight and not allowing valves to properly seat. After adjusting valves and re-running the evap test still ha... Trouble codes: P0440 (Evap System).
1996 Chevrolet Blazer 4.3L abs system VIN: 1GNDT13W8T
Hi Fellow Techs, Thanks to all that replied with suggestions concerning my ABS problems with the 1996 Chev Blazer. Ross hit the nail on the head and the problem is in the ABS modulator. I'm trying to locate a good used one as the dealer price for new is throug...
1997 Chevrolet Monte Carlo LS 3.1L Misfire VIN: 2G1WW12M3V
sorry took so long to get back to every one. Looks like the guys who said the lower intakes where the problem where right. Found some coolant mixing with the oil. Replaced lower intake gasket and fixed the problem. Thanks for all the help and quick response. Trouble codes: P0300.
1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R7W
I appreciate everyones help. The fix was having the truck programmed for a eight cylinder instead of a six.With the help of a good friend ,he led me to G.M.'s web site and when we punched in the calibration number it said it was a bad number for the truck we h... Trouble codes: P.0.3, P.0.3.
1999 Chevrolet Tahoe LS 5.7L Hesitation, Misfire, MIL Lamp on VIN: 1GNEK13R5X
First, thank you for all 26 replies. Some of the replies I recieved were sugessting pretty basic things like plugs, cap, rotor, and wires, and this reminded me that when frustrated, always go to basics first! I truely appreciate the reminder to start the diagn... Trouble codes: P0300, P0306.
2001 Chevrolet Venture LS 3.4L power sliding door VIN: 1GNDXO3E91
This vehicle is fixed and gone. After some time of checking everything, finally tracked down problem. Found a partially broken wire coming out of the junction box controlling the PSD's. Repaired wire and all is well. This would explain intermittent problem. Th...
2002 Chevrolet S10 LS 4.3L drive -axels VIN: 1GCDT13W92
Hallo my freinds tech. I would like to thank all the freinds tech.that helped to share theire opinion with me Im really gratefull.Beside Im sorry it took me longtime to answer back but the problem is the client didnt come back yet to the shop ,he said he will ...
2005 Chevrolet Express 1500 5.3L rear of truck VIN: 1GBFG15T15
First, thanx for the 14 replies, I talked to my service guy and he told me he would order a chrome plated slip yoke and he would call me when the part comes in. Gary
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