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Prev Professional Automotive Repair Technical Discussions for January 23, 2006
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Open Help Requests for GM
Help Request Answers
1989 Buick Electra Park Avenue Ultra 3.8L clutches VIN: 1G4CU54C6K
Car came to me originally with slow engagement of 2nd gear. Rebuilt it and reinstalled, and it worked fine up in the air with the exception of no 3-4 shift. Took it for a road test, and within ten miles, lost 3rd gear also. Took it out and tore it back down to...
1994 Buick Park Avenue 3.8L no power VIN: 1G4CW52L4R
This car came in with a complaint of running rough. When driving the car and you push the gas pedal to the floor the engine acts like it is starving for fuel and the vehicle begins to slow down. I have checked fuel delivery rate and fuel pressure all are wit...
1995 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52L1S
Vehicle came in with P0341 cam sensor stored, problem is cut out, stalls, poor performance when problem is present, however it is so sparatic we have not been able correct. Scoped cam sensor to ic and captured what we believed to be a fault in signal so replac... Trouble codes: P0341 (cam sensor)
1998 Buick LeSabre Custom 3.8L starter VIN: 1G4HP52K7W
Car came in with a crank (noisy, replaced starter) no start condition and a recommendation from another shop needed intake manifold. Verified manifold replaced same- and other listed items. Car was running well. Put in detail shop, and now wont crank. We have ...
1999 Buick Park Avenue Ultra 3.8L drivability VIN: 1G4CU5219X
we have this 99 buick park ave ultra that we have been fighting for a while. The car runs and shifts fine untill you start up an incline or start to accelerate under a little load. The car will start to surge real bad. The RPM will vary about 300 RPM. I scanne...
1993 Chevrolet Astro CL 4.3L No Start VIN: 1GNDM15W4P
Hello guys, We have a '93 Chevy Astro 4.3L with a no start condition. Has spark and fuel pressure. The fuel pressure drops from 60psi to 0 psi with the fuel return line & supply line clamped. COULD it be possible that the CMPI fuel assembly is leaking? Help!...
1994 Chevrolet Lumina APV 3.8L No Start, Stall VIN: 1GNDUO6L7R
Vechile starts, runs awhile and then dies. Will start again after several hours. This problem started after the vehicle was ran out of gas. I checked the fuel pressure regulator, found it was weak. Replaced it, still same problem. Checked fuel pressure, 42 lbs...
1996 Chevrolet Blazer 4.3L Steering VIN: 1GNDT13W6T
This 4wd blazer came in with customer complaining of looseness in the front end. After inspecting I found the idler and pitman arms to be worn pretty badly and some play in the ball joints. I replaced the idler, pitman, and all 4 ball joints but now when you t...
1997 Chevrolet Camaro 3.8L abs VIN: 2G1FP22K4V
HELP!! What seemed should be a simple repair has become my headache:(. This camaro has a abs light on, scanned and came up with code 1236 low system voltage. Checked and I only had 2.4 volts on the scan tool for system voltage, each time I cycle ignition volta...
1998 Chevrolet C-Series Kodiak C7H042 6.0L manifolds glow red VIN: 1GBJ7H1PZW
the exaust manifolds glow red driving [...],no codes o2 readings look good, all sensors respond and are in range egr working but couldn't remove to check if orfice is right size(isn't orginal) we really need ANY IDEAS! so please respond with any thing you ...
1998 Chevrolet S10 2.2L Hesitation, Surge, MIL Lamp on VIN: 1GCCS1449W
Hello everyone This truck was brought in for a check engine lite on and runs rough and down on power. Customer installed spark plugs and wires to try and correct problem with no luck. I checked fuel pressure and found 38 psi while running. I do notice the fuel... Trouble codes: P1626 (anti theft), P0440 (evap), P0341 (cmp sensor circuit), P0404 (egr circuit), P0335 (ckp a circuit)
1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEK19T8X
ok i have 3 or 4 of these doing the same thing or at least setting evap codes at random times, seems like more of a problem in the winter months, one is my vehicle and it will set a code for leak or soleniod problem then when i scan it everything is working fi... Trouble codes: P0446
2001 Chevrolet Silverado 3500 8.1L gear select VIN: 1GCJK39GX1
Truck belongs to my snow plow guy.We like to barter and I do not get into transmissions much. With engine running, I place shifter from PARK to DRIVE and the light emits on 3 or not all.Transmission hesitates engagement. There is no set pattern on which lights...
1996 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBE1860T
Tracker bought at auction. Initially had multiple codes. Did not write them down, before clearing ( I rememeber the TCC code and an EGR code being present). TCC code came up at first drive. Replaced solenoid and code did not come back. The following monitors a... Trouble codes: P0171
1994 GMC ISUZU W4 235CID Failsafe / limp home VIN: J8DC4B1K8S
Hello all, This truck came in low on fluid with cooler line rusted through not shifting. Replaced line with new and service trans. After driving found Econ light flashing . Pulled code #35 (Line pressure Duty solonoid)Replaced solonoid pack and ck curcuit from...
2001 Oldsmobile Aurora 4.0L Misfire, MIL Lamp on VIN: 1G3GS64C91
Thanks in advance for any suggestions on this one. Problem started suddenly yesterday. MIL lamp came on and engine was running rough. Found fault code P0300 - misfire detected. Checked plugs - slight carbon builup but nothing extrordinary. Replaced plugs and c... Trouble codes: P0300
2000 Pontiac Montana 3.4L traction control VIN: 1GMDX13E5Y
thanks in advance for any help. this is my wifes van so you can imagine the pressure!! we have had front wheel speed sensor codes so the front hubs are new. all was okay for 3 weeks, then at highway speed the "service traction system" light comes on and kicks ...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Century Limited 3.1L Rear Brake Lights VIN: 2G4WY52M9V
Thankyou to everyone that responded to my post. There was a toal of 18 replies. When it comes to electrical problems you just need to take you time and look at the wiring diagrams closer. It indeed ended up being the turn signal switch for the brake light prob...
1993 Chevrolet Lumina Euro 3.1L MIL Lamp on VIN: 2G1WN14T2P
To all that replied to my current problem, I thank you very much. Most of you were correct. It was the computer, ECM. I replaced it and it works fine. Thanks again guys!
2002 Chevrolet Trailblazer LS 4.2L Cooling Systems VIN: 1GNDT13S72
Thank you to those who replied, after checking the fan clutch as several of you described I came to the conclusion that the clutch was bad. Installed new fan clutch and system now operates properly.
2004 Chevrolet Express 2500 4.8L flywheel,bolts/flange VIN: 1GCGG25V71
well it turns out that this is a bigger problem than anyone could have guessed.the replacement bolts,spacer and flywheel do not work together and now there are gm engineers trying to find a fix.the customers personal fleet vehicle is stuck and the shop owner c...
1991 Geo Storm 1.6L charging light
Thanks for everybody helping me.The problem was the alternator,replace it with another brand,the voltage at white/blue wire from the alternaotr with the car running was 9.55 volts,still bad but this turns the fans on,the weird thing the fan run & the voltage a...
1997 GMC C7500 6.0L Poor Idle Quality, Misfire VIN: 1GDL7H1P6V
Unable to determine exact cause of problem, gave customer vehicle back without repairing concern. Some of the input I recieved was great info, checked the distributor, all was ok, all wiring and plumbing was examined, nothing found. Scan tool indicated a lean ... Trouble codes: 13 (Oxygen sensor open short or bad), 44 (Lean Exhaust), 45 (Rich Exhaust).
1998 GMC K1500 Sierra SL 5.7L abs VIN: 2GTEK19R9W
I want to thank Every one of the 30 techs that offered help with this truck. Most suggested rust on the tone ring or under sensor mounting could be the problem, this was not the case with this vehicle although the simptoms matched the TSB that they refered me ...
2003 Hummer H2 6.0L MIL Lamp on VIN: 5GRGN23U73
Hi and THANKS again Hummer fans. This Hummer left the shop Thursday and got call today all is well. No MIL light, No driveability issues. Harold from Virgina, suggested cleaning throttle plates that may be sluggish. After removing air intake found throttle pla... Trouble codes: P0120 (throttle/pedal positioner/switch a circuit error), P0220 (throttle/pedal positioner/switch b circuit error), P1516 (tp sensors are invalid/pcm and tac cannot determine the throttle position.).
2001 Oldsmobile Intrigue GLS 3.5L temp VIN: 1G3WX52H21
after further checking with the fans operating and flow good we still had an overheating condition customer declined further diagnosis and replaced vehicle
2000 Pontiac Sunfire SE 2.2L No Start, MIL Lamp on VIN: 1G2JB1248Y
Thanks again for all help. The customer decided to trade the car in. So I havn't seen the car since I fixed the headlights. Sorry I don't have any useful insight. Thanks again for all the help. Ken
2001 Saturn L300 3.0L 1-2 shift VIN: 1G8JW52R91
Hey Guys, Thanks to everyone who took the time to respond. Tom, Cecil and Dave hit it on the head. After reviewing the information in the TSB#04-07-30-020 for MIL light on code p1811 I ordered the pressure control solenoid from Saturn and removed the side case...
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