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Prev Professional Automotive Repair Technical Discussions for September 26, 2007
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Open Help Requests for GM
Help Request Answers
1993 Buick Regal 3.1L Stall VIN: 2G4WB54T3P
I hope someone has run into this before. Ihave this buick with an ecu that still runs the car but has issues with the cel driver. I got a reman delco from the dealer and put it in and the check engine light works great. The problem is that with the new ecu it ... Trouble codes: 46 (vats)
1992 Cadillac DeVille 4.9L rpm VIN: 1G6CD53B3N
From a stop without touching the gas pedal the vehicle will slowly accel to 15 mph. When Cruising at say 45 mph and you take your foot off the pedal it will stay at that speed like it is on cruise control. We have done the relearn procedure that identifix tech...
1999 Cadillac Eldorado ETC 4.6L wheel sensors VIN: 1G6ET1295X
vehicle came in w abs lite on code c1227 r/f sensor excess wheel spd variation , replaced hub sensor assy ,customer drove 30 mil ,same code set ,cleared codes roade tested 2-20 mile trips ok, third time less than 1 mile code c 1227 and c 1228 set but sensors r...
1970 Chevrolet Malibu 350CID Master Cylinder
This guy has been my customer for 15 years. Ever since I have maintained his car, the brakes have always had a very hard pedal.The best way to describe this condition is like driving a power brake car with the vacuum hose disconnected from the booster. The ped...
1991 Chevrolet S10 2.8L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCCS14R5M
Posting for another shop so I don't have all of the data available. Runs rich at idle with 14" of vacuum. Engine temp was 150, replaced thermostat. Still rich. Smoked the engine block and got smoke out of the throttle body. Replaced the intake manifold gaskets...
1993 Chevrolet K2500 Cheyenne 6.5L glow plug system VIN: 1GCGK24F9P
Need help again on this diesel. When cold, glow plug lite comes on and will cycle one time after. Truck starts very good. After truck gets warm, glow plug lite does not come on. Depending on how long the truck sits after warm up determines if it will start or ...
1996 Chevrolet Caprice Classic 5.7L egr ports restricted VIN: 1G1BL52P3T
Hello everyone and thanks for the help with this one. I have this Impala SS with the LT1 that has a P0400 stored for EGR flow problem. I can lift the EGR valve at idle and it does not even make the idle flinch. Obviously the ports are plugged bad. I removed th...
1996 Chevrolet K1500 5.7L Poor Idle Quality, MIL Lamp on VIN: 2GTEK19KXR
any help appreciated, running out of ideas, am suspicious of aftermarket ecm & sensors as none of the parts are gm , had customer bring in all original parts he changed. idles very rough at idle driving down road seems fine no hesitation or surging. Trouble codes: 28 (trans press switch manifold problem), 35 (idle aircontrol motor problem)
1997 Chevrolet Camaro 3.8L no crank VIN: 2G1FP32K9V
anti theft relay not recieving ground signal, passlock key system is sending correct resistance value to BCM no broken or shorted wires at passlock. Key pellet resistance is correct with same value being recieved at BCM. No codes present. Anti theft relay has ...
2001 Chevrolet Monte Carlo LS 3.4L b3128 code VIN: 2G1WW12EX1
This Monte CArlo sets a BCM code of B3128 LF door relay short to ground. Relay appears to be part of the BCM. You can watch the scanner data and with the key on and the door closed the door switch will randomly show open and then closed. Here is the strange pa...
2001 Chevrolet Blazer Xtreme 4.3L Misfire VIN: 1GNCS18WX1
Ok guys this blazer will not take gas. When you try to accelerate fast it falls on it's face and misfires. All the data looks good and no codes where found. What could it be? All the spark plugs and even the o2's where white, like it's a lean condition problem...
2005 Chevrolet Colorado Z85 2.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GCCS19855
This colorado came in missing on all 4 cyl. ,evenly, cant tell that one is worse than others.Power reduced message, and MIL on. I removed the cam phase solenoid and activated it, the pintle does move. It reads 0 on scanner. I am not familiar with this engine. ... Trouble codes: P0017 (CKP-Exhaust camshaft Position), P0300 (Random missfire)
1996 GMC Safari SLE 4.3L Hesitation, Misfire VIN: 1GKDM19W0T
this 4.3l has misfire at acceleration, scaner reads 4.65 volts at knock sensor at idle we replace sparck plugs, wires ditribuitor, distribuitor cap and rotor, injector # 6 and upper intake gasket, egr is worcking ok, compression is 160 psi and is mising cylind...
1998 Hummer H1 6.5L front brake VIN: 137ZA8438W
So my boss has purchased this hummer and I need to know the procedure for replacing front rotors, is there enough room to unbolt the axles and then slide the rotors out, or does more stuff have to come apart ??? any help would be awsome, Sean
2003 Hummer H2 6.0L Rear Air Suspension VIN: 5GRGN23U83
Looking to find a possible reset procedure for "Service Air Suspension" message on DIC (Divers Information Center). Lucky me with no Tech 2, but Modis, everything in the modis for BCM except air suspension (as usual). Customer refuses to return to dealer after...
1964 Oldsmobile Dynamic 88 390CID Heater Core VIN: 844M251966
Does anyone know If anyone makes a heater core for this Dinosaur any more called a few parts places around here and all say not available.Any ideas would be greatly appreciated.Thanks to all who responds.
1995 Oldsmobile Aurora 4.0L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1G3GR62COS
I am ready to burn this car, and can see why it was sent to auction previously! First it's a 1995 and uses an OBDII diag connector, but has non OBDII codes and I'm told it is OBDI. :? AFter replacing the ECM, it has not reset any of the previous codes, but i... Trouble codes: 80 (TPS Idle learn procedure incomplete)
1999 Oldsmobile Alero GLS 3.4L cooling syst. VIN: 1G3NF52E3X
Thankyou for your help. I have replaced the Intake for leaking.The thermostat was replaced when the intake was off. The customer had the water pump replaced before I got it. Now when you drive in the morning for about 7 miles it starts to overheat so I shut it...
2003 Pontiac Grand Am SE 2.2L headlights, dash, etc VIN: 1G2NE52FX3
on 9/20/07 we diagnosed an evap problem and put a new battery in car ever since then the lights, gauges, window functions etc keep working or stay on after car is shut off, sometimes the car will even stay ruuning with key out.
1993 Saturn SL 1.9L MIL Lamp on VIN: 168ZK5573P
I have a 93 Saturn SL 1.9 liter , and the oxygen sensor has no mv change, it is hung at 438 mvs, and it is staying in open loop. I have replaced the purge soleniod, the egr solenoid ,oxygen sensor and also put a new computer on it. I have checked all wires aro... Trouble codes: 27 (quad driver mod. fault), 26 (quad driver module failure)
2001 Saturn SC1 1.9L Misfire, MIL Lamp on VIN: 1G8ZN12801
thanks for reading this post I`m almost bald now. this saturn came in with the tops melted off #`s 1,2,3 pistons . replaced engine with used & now have po300 misfire code anytime engine is held over 4% throttle. misfire counters show #1 & #4 misfires.fuel pres... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1995 Chevrolet Lumina 3.1L Hesitation, Cuts out, Stall, stumbling
Thanks very much for your help guys, It WAS INDEED the low resolution crank sensor. We pulled the "Wells" sensor out and replaced it with a Delco sensor and have solved the problem. Thnaks again for your help.
1996 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire VIN: IGNDT13W9T
Hi all and thanks. Shipped this one last nite. Ended up replacing the injector and poppett on cylinder number 4 only due to cost restrictions. Took care of my miss. I needed a little boost in confidence that you guys took care of. In my haste to post this requ... Trouble codes: P0300 (Random cylinder misfire).
1998 Chevrolet K2500 Cheyenne 5.7L Misfire VIN: 1GCGK24R5W
ok guys i figured it out the heads are up at the machine shop i talked to them today they ashured me they did find the problem i have been chasing the valves were hanging open due to guide problems one of the things i noticed was the big connec...
1999 Chevrolet Silverado 1500 5.3L Radio VIN: 2GCEK19T2X
Thank you all! Especially Cesar, he's the man!!! I've got my tunes back! The dealer could have helped me out here, but they usually aren't that helpful to independants(the Chrysler service manager is worse, won't even loan manuals!). On my model you press 1 & ...
2000 Chevrolet Astro 4.3L Mechanical VIN: 1GNDM19W9Y
Hey All, Well it is fixed. I ended up replaceing everything again. Put on new Delphi compressor and new drier, many o-tubes, condensor, rear exp. valve, and manifold assembly. The original compressor that o thought was a reboxed delphi was not. I got a littl...
2001 Chevrolet Impala 3.8L Hesitation, Misfire, MIL Lamp on
Thanks to all that replied. the cars were fixed & gone a while ago. This was a knowledge builder for future reference to find out EXACTLTY what cause for failure was. Im still digging for more info that Ill post later to this. ALLDATA listed no exact TSBs for ...
2002 Chevrolet C-Series Kodiak C7H042 8.1L Backfire VIN: 1GBM7H1E52
Something I did not mention was an EGR short code-P0405. I diagnosed this code and found a defective EGR Valve. The valve was actually opening when commanded but was not sending a signal to the PCM that it was. So my theory behind it was that the computer t...
2003 Chevrolet Impala LS 3.8L no crank, theft light on sometimes VIN: 2G1WH55K33
Sorry for the no fix to end my post, customer is in the wind, have not had vehicle back in shop I delayed posting fix because I was hoping customer would show up. I received many excellent replies some from G.M. techs including problems with lock cylinders, i...
1997 GMC Jimmy SL 4.3L No Start VIN: 1GKDT13W6V
Hey guys thank you so much for all the replies i changed fuel pump and pressure went up to 66 psi and vechicle started.Thanks again and god bless.
1993 Hummer H1 6.2L engine VIN: 137XE8331P
Well this Hummer is finally fixed.It ended up being two of the injectors leaking.Quite the learning experience.Had all eight rebuilt and noise is gone.Interesting that this noise was not there before the work was done.As usual you guys came through again.Than...
1998 Oldsmobile Bravada 4.3L Cuts out VIN: 1GHDT13W3W
Well I'm not sure what was wrong might have been bad gas, change the fuel filter again,It ran fine for a week then came back with an O2 sensor code, it was a sensor bad.It has not acted up since.Thanks for all the replies Trouble codes: 0300 (multi cylinder miss fire).
1999 Pontiac Firebird Formula 5.7L Alternator VIN: 2G2FV22G6X
Well I guess I will call this one fixed, vehicle has been gone with no problems. Contacted customer and he stated that no further charging problems have occured. I did disconnect the aftermarker amplifier, I will say possibly low quality aftermarket amplifie...
2002 Pontiac Grand Prix GT 3.8L Anti theft VIN: 1G2WP52K32
Well I gave it some time now and the car seems to be working fine. Replacing the passkey moduls did the trick. Thanks again to all who helped with this problem. You guys are great!!
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