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Prev Professional Automotive Repair Technical Discussions for September 9, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Regal Gran Sport 3.8L a/c, tcc, evap, cooling fans VIN: 2G4WD54LXM
hello techs this buick is really got me puzzled. it came in a month ago with a code 26 (quad driver code) the dealer had previously installed a reman pcm(cust. was not sure why) my initial thought was tcc solenoid just from looking at archives although i have ...
1989 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Hesitation, Poor Fuel Economy VIN: 1G6CD5156K
Hey evryone, I don,t know much about the GM tbi systems the car came in as no start checked spark and fuel & injector noide all present, found out injectors were driping not spraying, checked fuel pressure good but low volume, repl fuel pump, now car started b...
1997 Cadillac DeVille 4.6L anti-theft VIN: 1G6KD54Y9V
Dash display's "theft system problem". Has current code B2711. Engine starts and runs.
1997 Cadillac Seville STS 4.6L abs VIN: 1G6KY5292V
hey techs. this seville sts activates the traction control intermitently usually after backing up then going forward making a left hand turn. pulled several snapshots with tech2 but dont see any thing out of wack all wheel speed sensors stay within two mile pe...
2003 Cadillac Deville 4.6L Valve Problem #3 Cylinder Exhaust Valves
Car ran poorly, 5" vacuum at intake. O2 semsors running rich with -33 STFT. Bad miss in #3 cylinder. Coil cassettes are ok, fuel pressure ok, injector patterns look the same on all injectors. Fuel pressure and volume test ok. Compression on #3 Cylinder is 0 wi...
1992 Chevrolet K2500 Suburban Silverado 7.4L Excessive Emissions, Poor Idle Quality, Cuts out, Poor Fuel Economy VIN: 1GNGK26N7N
This one came in after the cust replaced all of the above items it runs rough in park and sometimes stalls in park. It cuts off as soon as you put it in drive. I checked timing and it is fine the baro is reading about 102 and 4.98 volts the fuel pressure stays...
1993 Chevrolet Lumina APV 3.1L Cuts out VIN: 1GBDU06DIR
This vehicle came in on a hook,no start, checked for spark, no spark, checked ignition system. Ignition module checked and tested bad, pick up coil checked and tested bad. Changed out distributor assembly with reman distributor, also changed spark plugs, ignit...
1996 Chevrolet K1500 4.3L No Start
we told customer he needed an o2 sensor; but based on mileage and all original o2 sensors we recommend changing all 3. he agreed, repairs were made, test drove - no codes present. we released vehicle to customer but within 1-2 days code 154 came up again. we w... Trouble codes: 154 (bank 2 sensor 1 fault), 175 (rich in history)
1997 Chevrolet K1500 Cheyenne 6.5L Excessive Emissions VIN: 1GTEK19S1V
customer brought the truck in two weeks ago had code for mass air flow so cleaned it and let customer go truck came in tuesday same thing but with code for egr this truck would also smoke black when you accelrate sometimes we changed the injectors and the egr ... Trouble codes: 101 (mass air flow), 401 (egr flow in suffient)
1998 Chevrolet Cavalier 2.2L airbag VIN: 1G1JC5244W
Greetings to all Im looking for some info on this car it has an airbag lite on and codes for 1018 passenger loop short to ground,1024 driver lop short to ground,and1071 internal failure in module.From what all data says the module must be replced when these co...
1999 Chevrolet Malibu 2.4L Misfire VIN: 1G1ND52TXX
This car was towed in. It would start but had a bad misfire. I scanned and came up with code P0300. Checked and discovered #1 & #3 cylinders misfiring. Replaced coils, plugs and coil housing. Car ran fine, road tested and delivered car. About ten days later, c... Trouble codes: P0300 (intermittent misfire detected)
2000 Chevrolet Cavalier Z24 2.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G1JF12T8Y
I am working on a custom project where the car is totally custom. This car is a 2000 Cavalier quad 4 with an aftermarket turbo charger. The customer has replaced the MAP sensor with a BARO sensor off of a 2000-2004 Duramax 6.6 "1" application. He says that the...
2001 Chevrolet Lumina 3.1L Cuts out, MIL Lamp on VIN: 2G1WKL52J8
we have a 2001 lumina 3100 that looses 5v ref for egr , map , tps , fuel sensor . this is from back probing at pcm . problem occurs while driving , can also recteate with steady brake torque in bay. pcm only sets tps code. we send pcm for reprogramming , and w... Trouble codes: P0122
2002 Chevrolet Express 2500 5.7L Misfire, MIL Lamp on
Hello everyone and thanks In advance for any information. I remember reading in some old forums about a fuel injector campaign from GM concerning fuel injector replacement or a cleaning method but I could not find this information In the archives. I have limit... Trouble codes: P0303, P0305
1992 Geo Tracker 1.6L output seal VIN: 2CNBE18U0N
We are working on a 92-geo tracker with a 5-speed manual. The original transmission failed so we replaced it with a used one with 82,000 miles on it. We installed a new output shaft seal from the dealer in the used transmission. The tracker came back the next ...
1994 GMC Yukon 5.7L Poor Idle Quality, Stall VIN: 1GKEK18K7R
this given me old headache.someone jog my memmorie please!has stumble @ idle smooths out with vss signal above 5mph. also dash tach affected reads 200rpm scanner shows correct.idle is reasonable before tach begins to error.thank you for reading and any help.
2002 GMC Yukon Denali 6.0L Stall VIN: 1GKFK66U52
Hello all I have a friend who just bought a denali on ebay. The truck is in great shape and runs great. anyway the truck will at times not start. It will start and die like it isnt getting fuel? I checked fuel pressure and it is in specs and doesnt bleed down....
1996 Oldsmobile Achieva SL 3.1L door locks, radio, interior lights VIN: 1G3NL52M0T
Customer complains about the door locks erratically operating while going down road. Same with interior lights.These symptoms started when they wiggled wiring to rear speakers in trunk. Radio hasn't worked properly in a "long time". I notice that when you turn...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Surge, Cuts out, Misfire VIN: 1G2WK52J52
This vehicle came in with a severe lean hestitation on accel. Dealer flashed the PCM, thinking an update might fix the problem. No change We are at a loss of where to go from here. Trouble codes: P0300
1997 Saturn SL1 1.9L compression VIN: 1G8ZH5280V
This vehicle came in as a no start. Fuel is good, spark is good, compression is 0 all cylinders. Pulled valve cover and cam turns when engine is cranked. Cranking speed is fast. We are pulling timing cover to check to see if it has jumped timing. What we would...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick LeSabre Custom 3.8L air vents VIN: 1G4HP53L6P
Thanks for all the help on this car. I am sorry for waiting so long to update, but customer(brother-In-Law) just brought car back this week. We found a leak in the vaccum tank, a small hair line crack right where it bolts to firewall. We replaced but this did ...
1997 Buick Riviera 3.8L no comms VIN: 1GAGD2219V
Hi everyone, Thanks to the guys who replied to this problem. The car is fixed sort of! Testing the UART network further it was scoped and a 5 volt square wave was seen as expected. There was however continuity to earth of around 500k ohm. after lots of disco...
2002 Buick Rendezvous CX 3.4L idle high VIN: 3G5DA03E52
The vehicle sympotms would not reoccur except for the original time. After 2 days customer picked up. I will let ya'll know if any more info comes up. A couple replies I recieved were Vaccum leak and AC ripple.
1993 Chevrolet Astro 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GBEL19W5P
I recieved a lot of responese to look for the fuel pressure regulator leaking so i decided to change the cpi unit and all is well. Trouble codes: 45 (rich exhaust).
1994 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS19W4R
as most of you suggested it was the pump.i did the tests that were sent to me( learned a few things) but in the end it turned out a pump fixed it.thank you to all who replied.
1995 Chevrolet Tahoe 5.7L a/c VIN: 1GNEK13KOS
Vehicle Owner Went On Long Trip,While On Trip Alternator Failed, Had Repaired. A/c Working Properly. Owner Also Stated That Radio Had Noise,Also Gone With New Alternator. Thanks For All Replys, Great Info.On How To Repair Vehicle.Thanks Colburn Brothers Garage
1995 Chevrolet Blazer 4.3L gauges fuse VIN: 1GNDT13W4S
when i tested the 4x4 switch on the axle it tested out fine but it sounded funny when i shook it so i replaced it with a known good one and hasnt done it since . thanks for all the tips were very helpful.hope i can return the favour some day thanks again.
1996 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEC16R0X
found broken intake rocker stud. after taking apart intake and exhaust valve train, found top of intake rocker stud sheared and bent. replaced, works beautifully. Trouble codes: P0300 (random misfire).
1998 Chevrolet K1500 Suburban 5.7L electric mirror
Summary: Thanks to all, got some interesting replys like, 'run that guy out of town with a pack of wild dogs.' The general response was that no, I did not cause the problem, which it turns out is not all that uncommon. Called my local dealer, (Denver) and they...
1993 Geo Tracker 1.6L Starting VIN: 2CNBE18U1P
Hello everyone, Timathy from Nova Scotia said he had sme condition and was bad disrtibutor, that was problem on this one. Thanks for info on this Timathy, and thanks to all other replys. GOOD DAY
1996 GMC Yukon SLE 5.7L MIL Lamp on VIN: 1GKEC13RXT
Fuel pressure is 50 psi running. KOEO 59 psi, then pump shuts off and holds at 53 psi, volume 8 oz in 15 sec. Back pressure idle 1 psi fast idle 1 psi or less. on acceleration peak 2 psi drops to 1 psi. I have 20 inchs of vacuum, it is steady. disconnected EVA... Trouble codes: P1153 (insufficient switching bank 2 sensor 1), P0155 (ho2 heater ciccut bank 2 sensor 1).
1999 GMC K2500 Sierra SLE 7.4L MIL Lamp on VIN: 1GTGK29J5X
Sorry I have not come up with a fix yet but will keep you posted. Here is a list of what I have done and what I have come up with since my initial posting: tested and confirmed all grounds from PCM, sensors, and chassis; replaced the fuel pressure regulator an... Trouble codes: P0175.
1993 Oldsmobile Silhouette 3.8L MIL Lamp on VIN: 1GHDU06L7P
Well I believe this one is fixed, with help from John Anderson, of Anderson Auto Olathe, Kansas. John found a similar problem listed on Identifix. Loacated in the convienence center,underneath dash on passenger side, is the location of a 15 amp ignition fuse a... Trouble codes: 17 (Crank rpm signal shorted), 47 (uart link problem), 26 (Quad driver module failure), 56 (quad 2 problem).
1998 Oldsmobile Cutlass 3.1L Misfire, MIL Lamp on
i fix the car by removing the injectors 3& 6 was stopped up still dont know why they passed the injector flow test thanks for the help Trouble codes: 300 (misfire).
2000 Oldsmobile Alero GL 2.4L Misfire VIN: 1GNL12TXYC
Tried as suggested replacing coils and shell and boots to no avail. Even with new coils, shell, and boots, miss was isolated to only two cylinders. Cylinders number 1 and four. Even swapping coils, boots and plugs would not change anything. Miss stays isolated...
2000 Oldsmobile Intrigue GLS 3.5L Unknown VIN: 1G3WX52H4Y
Well I recieved 5 replies.Most of you said to check the hub bearing.The runout was fine on the rotor and hub.What we ended up doing to fix the problem was to turn the new front rotors.And we replaced the rear rotors and pads.Apperantly the final finish on the ...
1987 Pontiac Fiero GT 2.8L Flywheel VIN: 1G2PG1193H
Thanks to Chuck [...]. They all sent replies regarding this vehicle, some worth looking into. I have replied to all, and will advise further when a real solu...
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