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Prev Professional Automotive Repair Technical Discussions for March 18, 2008
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WY55J61
i have replaced the egr valve reset codes and the light came back on after thirty minutes driving then i reprogrammed the computer and the light came on again Trouble codes: P1404 (egr valve stuck open or circuit performance)
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1992 Cadillac Fleetwood 4.9L Stall VIN: 1G6CB53B8N
Customer brought me his caddy,says it needs a fuel pump.Says the car starts to run poorly and stalls like it's out of fuel when the tank is still 1/4 full.I verified the stalling by draining the fuel tank(through my pressure tester into a jerry can)until the f...
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2001 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KE54Y5Y
need help gm tech's. i have a 2000 cadillac deville dhs that keep's missfiring on #3 cylinder. i have checked compresson 150psi, changed plug's (ac delco) changed coil pack assy and even changed #3 fuel injector. it still has a missfire in #3 cylinder. re chec... Trouble codes: P0303
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2002 Cadillac DeVille DHS 4.6L Misfire VIN: 1G6KE57Y12
I have a missifire on #5 cylinder only at times under 4th gear light load and when decelling and light throttle in OD. I have swapped coil cassettes, replaced spark plugs and boots on all odd # cyls (so I would'nt have to pull that rear cassette again), perfor... Trouble codes: P0300 (Random Missfire)
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1992 Chevrolet Corsica LT 3.1L No Start VIN: 1GILT53TIN
92 Chevy Corsica will not start. Has Sparks,has fuel, still will not start. Spray starting fluid, nothing. I replaced the crank sensor, could not access the ECM codes, replaced the ECM but still will crank but will not start.Compression all above 100psi except...
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1993 Chevrolet K3500 Cheyenne 7.4L Electronic VIN: 1GCHK39N8P
This is more a request for information. Im looking for the "ABS Diode Module". Ive been told everything from the left side of the dash to behind the glove box. I believe the diode module is shorted and back feediing voltage to the PCM and other places it shoul...
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1993 Chevrolet Corsica LT 3.1L Poor Idle Quality, Hesitation VIN: 1G1LT553T1
Good ol GM. This is our shop car and we are in dire need of some help. At start up she runs fine. Great in fact, but after about five minutes it begins to idle real rough and hesitates. Checked over injectors and found a bad injector, replaced and this fixed i...
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1997 Chevrolet Venture LS 3.4L Air bag VIN: 1GNDX03E8V
This vehicle came in with the air bag MIL lit and codes B1024, drivers senslo and B1071, SDM malfunction. Tested system with a 2.2 ohm resistor and found no problems. Replaced the SDM and all was fine for two months. Came back. Same codes. Tested again, replac...
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1999 Chevrolet Silverado 1500 4.3L Misfire, MIL Lamp on VIN: 1GCEC14W2X
Greetings Hate to have a ask questions sometimes. Just cant quite wrap my brain around this one, when the pcv valve is installed in the valve cover, the ecm records misfires on cyl #1. When you remove the pcv from the valve cover the misfire counter stops. I h... Trouble codes: P0300
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2000 Chevrolet Impala LS 3.8L lr wss VIN: 2G1WH55K7Y
thanks to all who reply,car came in with abs,trac off lites on. scan for codes c1234 only code in abs. checked all wheel speed sensors, related wiring, can not find problem. here is one thing i know,back probe harness connector c101 lr wss wiring there is an a...
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2001 Chevrolet Suburban 1500 5.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 3GNEC16T91
Customer complained of no throttle response and instrument cluster displays REDUCED ENGINE POWER. Trouble codes: P1120 (Throttle Position Sensor Circuit), P1220 (TP Sensor Circuit 1 or 2), P1516 (Electronic Throttle Module vs. Throttle Position), P1518 (PCM to TAC Module Serial Data Circuit)
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2002 Chevrolet Suburban 1500 LS 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 1GNFK1GZ72
havnt ran into one of these yet. eveyone says bad fuel sensor.are they on the rail or in the tank? heard both also is there aftermarket yet? Trouble codes: 178 (179 -), 179
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2004 GMC Sierra 2500 HD SLE 6.6L Misfire VIN: 1GTHK23144
this unit runs rough at idle no codes all injectors on cylinder cut out are the same except #5 is slightly different and i mean not as pronounced on injector cut out the boost sensor reads 13 psi at idle frp is 5700 psi and stays stable , there are 3 injectors...
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2001 Pontiac Grand Am SE 2.4L No Start, Misfire VIN: 1G2NF52T11
Having a QUAD 4 nightmare. This vehicle backfires while cranking. So far it has broken 2 starters. If the fuel pump is disabled I can crank it normally, but I feel there is a problem with ignition timing, because cranking with propane will duplicate the backfi...
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1992 Saturn SL 1.9L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1SATURNLS2
This car lacks power on acceleration and doesn't want to go over 55mph. It is running rich above idle speeds and sets rich running code intermittently. It will go through 6 gal of gas in 60 miles. It starts good and idles good and nothing showing up on scanner...
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2001 Saturn L300 3.0L Misfire VIN: 1G8JW52R91
Notice that the coil packs are under intake and I am having a problem. What is the best procedure to remove the plenum to remove the coil packs to check the plugs. I have removed all visible retaining bolts but it does not seem to want to loosen. Saturn Techs ... Trouble codes: P0306
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2004 Saturn Ion-2 2.2L ignition switch VIN: 1G8AJ52F94
what i have here is a recovered theft. the key is stuck in the ignition. there is a switch under the steering column cover, that makes it possible to turn the key to the off position and remove it. my question is what activates that switch? putting the vehicle...
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Fixes & Summaries for GM
Fix/Summary Answers
1991 Cadillac Fleetwood 4.9L ABS Braking VIN: 1G6CB53B3M
Thank You For Your Help. Their Was A Crack In Right Front Wheel Speed Sensor Ring Causing Intermitent ABS Braking. It Would Not Set Any Codes.
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1998 Cadillac Seville STS 4.6L instrument cluster, a/c control head VIN: 1G6KY549XW
AFTER A RELENTLESS EFFORT COMPARING TWO IDENTICAL VEHICLES SIDE BY SIDE, I COULD FIND NO DIFFERENCE IN PIN VOLTAGES!!! SO I DECIDED TO PUT IT ALL BACK TOGETHER AND IT NOW WORKS PROPERLY... I THINK BY DISCONNECTING THE VARIOUS MODULES IT RESET THE SYSTEM. THE...
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2001 Cadillac DeVille 4.6L Poor Idle Quality, Stall VIN: 1G6KD54Y01
thanks for your help on this vehicle. special thanks to alex from georgia. you hit the nail on the head with the 3 7mm bolts in the fuse box. they were backed out at least 5 turns. also checked the powers and grounds at pcm and under thermostat housing. vehicl... Trouble codes: P0106.
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1999 Chevrolet Corvette 5.7L Mechanical VIN: 1G1YY32G3X
Its funny how most of my case problems have never been seen before. As always, I hope this case saves someone time and money with the there next vette. The failure was the drive shaft bushings/retainers were destroyed, the driver went far enough so that there ...
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1999 Chevrolet Silverado 1500 4.8L No Start VIN: 1GCEC14V8X
THANX TO EVERYONE WHO SPENT THEIR TIME, AFTER EXHAUSTING EVERY POSS. DIAGNOSTIC WALK THROUGH FINNALY FOUND THE CRANKSHAFT HAS EXCESSIVE END PLAY AND THE CRANK SENSOR HAS GOOD SIGNAL BUT BAD FREQUENCY ENGINE IS BAD Trouble codes: P0336.
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1999 Chevrolet Monte Carlo 3.8L No Start
OK here is what we did. I looked up a different vehicle on mitchell on demand (98 monte carlo), found a differant flow chart. followed to a tee. came to where it said to replace crank sensor ( we already have), put an AC Delco sensor in and PROBLEM SOLVED!!! T... Trouble codes: P0440.
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2001 Chevrolet S10 4.3L #1 Spark Plug VIN: 1GCCS19W01
Some replies asked if it was a cylinder/ring problem...checked thoroughly as noted in original request...not a cylinder/ring problem... some mentioned intake manifold/gaskets...some mentioned oil filter lines
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2001 Chevrolet Express 1500 4.3L No Start VIN: 1GCEG15W31
I Thank all for the replies to this help request. Sorry didn't get back to you fast. The customer got sick and took along time to see if They are gong to fix this van. The answer at this time is they are going to tow the vehicle to the dealer for second opinio...
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2001 Chevrolet Silverado 1500 4.3L Mechanical VIN: 1GCEK14W01
thanks to all that replied after finding that the o ring tsb dint apply to the 4.3 we replaced the lifters and fixed the problem thanks agian jeff
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2002 Chevrolet S10 4.3L electronic brake control module VIN: 1GCDT19W22
thank you to all that replied i found the splice pack for the serial data and ohmed out the wire to the ebcm. it ohmed out good. i can communicate with all other modules with no problems. my best guess on this one is the ebcm is faulty but do to my lack of k...
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2003 Chevrolet Tahoe LT 5.3L Automatic Tranmission VIN: 1GNEC13ZX3
Since this is an "employee" vehicle we have not had time to try any of the fixes people were kind enough to send. We hope to get at it this week. Thanks to all the responded
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2004 Chevrolet Silverado 2500 6.0L abs module VIN: 1GCHC24U14
Thanks to all that replied !!! Very good input...I checked voltage at main wire again ( 12 Ga red, plugs into front of motor)and had 12v ( not 14.2 ) with eng running...then tied a 4411 head light into it and it would not light it...so long story short, voltag...
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2000 GMC Safari SL 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GKDM19W4Y
thanks everone. most replies were about the sticking poppet valves. that is what it was. i also replaced fuel pump because of the bleeding down koeo. the updated fuel injector assy was very nice and solved the missfiring, and fuel pump is now holdind pressure,... Trouble codes: P0300.
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1997 Oldsmobile 88 Royale 3.8L No Start, Stall VIN: 1G3HN52K7V
After reading all of the relevant and not so relevant replies, I went back to the wiring harness. After checking the harness, connections and anything alse that may have looked suspect, this thing ran perfect BUT I DON'T KNOW WHAT FIXED IT! So frustrating. Cus...
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2000 Oldsmobile Alero GL 2.4L Misfire VIN: 1G3NL52T5Y
Well that was pretty much unanimus. I really appreciate all the responses I got from everyone. The plastic coil housing tower piece did end up being the problem, seems it was cross firing internally. Man the dealer is proud of that thing aren't they? For al... Trouble codes: P0301 (Misfire detected in cyl 1).
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1996 Pontiac Firebird Formula 5.7L Cuts out, Stall, Misfire, MIL Lamp on VIN: 2G2FV32P0T
It is fixed!! Thanks to Chris S., Ronnie [...]. for all the help. The owner took two weeks to think about the expenditure, but finally agreed. The fix was in fact the distributor. I disa... Trouble codes: P0300 (multiple misfire), P1361 (di low resolution circuit).
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