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Prev Professional Automotive Repair Technical Discussions for October 5, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L Charging VIN: 1G4CW52K9S
Dash volt gauge red light always on. At idle & higher, in park, A/C & headlights on, 14V.(measured with voltmeter) In "drive" A/C and headlights on, reads 10V with 1 amp output. The more load the less volts in drive. Amps won't keep up. Red wire from computer ...
1979 Cadillac Eldorado 5.7L No Start, Poor Idle Quality, Misfire, BLACK SMOKE VIN: 6L57B9E652
Good day fellow technicians, I am writing to get support or not that what I am looking at is a failing ECM in this antique Caddy. The problem started when the owner stopped to eat. It was running fine when she stepped in the restaurant. It would not start wh...
1992 Cadillac DeVille 4.9L Cuts out, Misfire VIN: 1G6CD53B6N
Car fels like it has a missfire on more than one cyllinder on idle.On acelleration it "seems" OK , but usually dies on decel. Had no kickdown operation. Replaced distributer with used unit.Kickdown returned.Still runs poor. Fuel pressure good, volume poor lots...
1995 Cadillac Eldorado 4.6L Security Light VIN: 1G6EL12Y0S
This vehicle has a security light on steady but still starts. Alldata says light controlled by Theft Deterrent module and vehicle should not start. AllData also states the module is located in the left hand electronic bay in trunk but the module is not located...
1991 Chevrolet Caprice Classic 5.0L abs VIN: 1G1BN53E1M
Evening folks, customer came in last week with a complaint of "abs light on" we scaned the system and found a code 21 right front wheel speed sensor, replace both left and right (always do the job properly) sensors, cleared the codes and went for a road test, ...
1993 Chevrolet Corsica LT 3.1L long crank VIN: 1G1LT53T0P
cust complaint high idle and long crank before start.we checked for vacume leak none detected.iac count was 69 tried a new iac high idle came down a little from 2200 rpm to 1400. throttle angle was at 7% turned down to 4% idle droped 100 rpm still a bit high,a...
2001 Chevrolet S10 4.3L MIL Lamp on VIN: IGCCS19W21
the p0410 is the only code that returns after 60 miles this truck and calif emissions are getting the best of me , the customer cannot get a tag until it will pass any body that has has had a experiance with theese please give me some imput all will be welcome... Trouble codes: P0410
2002 Chevrolet S10 2.2L Excessive Emissions VIN: 1GCCS1944X
Monitered O2 sensor voltage with oscilloscope and compared max and min voltages with propane enrichment to ascertain data from computer matched actual O2 voltage output. They match within a couple hundredths of a volts. Monitered O2 sensor pattern during ASM t...
2002 Chevrolet Trailblazer LS 4.2L Lighting VIN: 1GNDT13S52
good afternoon, i have my brothers 2002 trailblazer here and it keeps melting the headlamp connector.(left side) i got 2 harness from gm and the have both melted in a very short time. (2 days) looked in mitchell and in the archives here and found nothing. i h...
2002 Chevrolet Monte Carlo LS 3.4L Coolin Fans VIN: 2G1WW12E02
The fans stay on at high speed with the engine running. If I diconnect the a/c pressure switch the fans go off but the a/c compressor does not come on with the switch off. koeo the fans do not come on but do come on with in seconds of starting the engine. No P...
2002 Chevrolet Monte Carlo LS 3.4L Cooling Fans VIN: 2G1WW12E02
When engine is started the cooling fans come on at high speed. No codes, normal operating data. Can command the computer to operate the fans on and off but when I exit the command page the fans come back on high speed. With the key on engine off the fans stay ...
1997 GMC Yukon SLE 5.7L fuel guage VIN: 1GKEK13R8V
This 97 yukon has a erratic fuel guage at all times. While driving, the guage sweeps between below quarter, to full, it does it less with a full tank. with the key on engine off,vehicle stoped, just gently rocking the vehicle, it will act up. I have replaced t...
1999 GMC Sierra 1500 SL 4.3L Misfire VIN: 1GTEC1AW6X
Vehicle has missfire under minor load until hot, missfire only present above 8 mph. If wheels are not turning vehicle runs fine.Injectors have been cleaned, new cap, plugs, wires. Thanks for the help Trouble codes: P0300
1997 Oldsmobile Cutlass Supreme SL 3.1L cam shaft VIN: 1G3WH12M5V
Car came into shop today running very poorly and check engine light was on and stalling, no other lights on, enigine oil, coolant was full (did not add any ). Ran scan test found no data stream (could not pull codes) coming from the computer printed wiring dai...
1998 Oldsmobile Aurora 4.0L Stall, MIL Lamp on VIN: 1G3GR62C5W
P0101 this aurora seem to had this code for a while it came to us from other shop who gave up. it intermitnently sets a code P0101 when the engine is warm and normaly happens on the first to second gear shift on normal acceleration.it had a rebuilt delco maf &... Trouble codes: P0101 (maf)
1992 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Surge, Stall VIN: 1G2W314T6N
HELP this car is owned by a friend of my mom. car has been at two shops. problem started as stalling, has had intake done twice,second time to verify first, egr valve , and two computers first installed with injectors wire shorted then second to repair first b... Trouble codes: 44 (lean exhast)
1994 Pontiac Firebird 5.7L Headlights VIN: 1PABP23X6G
This car does not have twilight sentinel,but the headlights come on when the car is started in the dark without turning the switch on,and won't go off untill the car is shut off,if it is light out the headlights work normally. Thanks in advance this one is har...
1996 Pontiac Grand Am SE 3.1L spedometer VIN: 1G2NE52MXT
the speedometer is not working in this car. we test vss sensor in the transmission, voltage and hzs reading was ok. we replace with used. now the car is not starting. maybe the computer has to be promg. because the thef system in the instrument cluster or ...
1999 Pontiac Montana 3.4L Hesitation, Surge, Cuts out VIN: 1GMDX03E7X
Hello Cyber Techs...Replaced rack and pinion assembly and customer came back after the weekend complaining of the vehicle now bucks and jerks while giving mild acceleration. Road test confirmed the problem and it feels like someone is cutting the electric powe... Trouble codes: P0687 (Indicator circuit low), P0689 (Indicator circuit open)
2000 Pontiac Grand Prix GT 3.8L Surge, MIL Lamp on VIN: 1G2WP52K9Y
Hello fellow members,Thanks in advance for any input on this one.Customer complaint is loss of tachometer and traction control lite comes on,short "chuggle" when the light comes on, was able to test curcuits 573 CKP to ignition module,curcuit 647 18X signal fr... Trouble codes: P0336, C0236 (traction control system rpm signal malfunction)
2000 Pontiac Grand Prix GT 3.8L 1-2 shift and 2-3shift VIN: 1G2WP52K5Y
Vehicle shifts hard all the time for me,owner states intermi,looking at TSB 00-06-04-037A,will check battery connections and ISS circuits tomarro,just looking here too.
2001 Saturn SC2 1.9L Cuts out, Stall VIN: 1G8ZR12761
Hello, This car loses power and dies or may not die but just sets there and runs about 500 rpm no matter what you do with the pedal. I can let it set for a few minutes and it may go a mile or two and then same thing. I first checked fuel pressure, no pressure,...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac DeVille 4.9L radio,wipers VIN: 1G6KD52B05
Found the rap relay in the trunk and it came on after 5 min. when key was off. Found the rapie module also in the trunk and disconectted it at the customers request, did not to to go any further in repairing the car. I thank you for your responses Charlie al...
1995 Cadillac DeVille 4.9L Hesitation, Cuts out VIN: 1G6KD52B4S
I would like to thank all that replied. David was correct in a way, but I didn't have any codes. Gene from Alabama hit it dead on. Customer had the transmission replaced elsewhere. The data for PD 70 was at 100%. What I thought I was checking from David if I u...
1997 Cadillac Seville SLS 4.6L Surge, Cuts out, High Idle VIN: 1G6KS52Y8V
First I would like to thank Klint of Ohio, and David from Florida. They both seemed to think that the problem was with the IAC, which is what my first thought was also. I had pulled the IAC to inspect it and clean any carbon from the area. The problem with thi...
1993 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Poor Fuel Economy VIN: K4P1154896
all is well.the p/u did have aftermarket heads and cam installed.i had to install new shorter push rods and had to install a new promm.thank you for all the help.
1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXX
Component tested the right bank 02 sensor. Found that the sensor was reading correctly and indicating that the bank was running rich. Ohm tested the wiring harness and found no problems there. Performed a voltage test of the preheater and was receiving battery... Trouble codes: P0300 (Engine Misfire Detected).
1996 Chevrolet Astro 4.3L Hesitation, Cuts out VIN: 1GNDM19W6T
Well thanks everyone for your help, the problem turned out to be volume. Half the outlet house of the fuel pump in the tank was off the spout, only half the fuel was getting to the engine. Thanks again guys.
2001 Chevrolet Silverado 1500 5.3L gauge/light VIN: 2GCEK19T71
thanx everyone found even though i charged battery it was still low on power for some reason.someone recommmended let it run for a while.found as time went on amps dropped.after a half hour it was charging 13.9 with 30 amps with day time running lamps on.test ...
1993 GMC C3500 Sierra 7.4L knock sensor VIN: 1GKDC34N8P
Thanx for all the replies, this knock sensor was covered with black Permatex gasket maker, after peeling off all that Permatex, a 22MM 6 point socket fit on the nut, but it was so rusted, it rung off the shoulders of that nut. A hugh pair of ChannelLocks got t...
2002 GMC Yukon Denali 6.0L Ride control VIN: 1GKEK63U42
Thanks to all who replied. We replaced the suspension control module located in the right rear of the vehicle next to the rear blower motor. After the test drive all is good. Once again thanks to all.
2003 GMC Savana 3500 6.0L crank fuse VIN: 1GTHG35UX3
found poor ground on main fuse panel. clean connection and vehicle did not blow fuse any more
1996 Pontiac Grand Am SE 3.1L Stall, Anti theft system VIN: 1G2NE52M9T
After receiving help from several people I traced it down to the pass-lock control modual in the insterment cluster. Seems this is happening a lot since I found a test unit in a junk yard after a long serch because most all the insterment clusters are missing.... Trouble codes: P1629.
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