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Prev Professional Automotive Repair Technical Discussions for November 18, 2009
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Open Help Requests for GM
Help Request Answers
1997 Buick Regal LS 3.8L spedometer, engine VIN: 2G4WB52K9V
This '97 regal came in today with the customer complaining of a intermittent buzzing sound that causes the speedo to jump around. Also on ocasion turning on the turn signals will somtimes kill the engine. The buzzing was coming from the flasher and I could onl...
1997 Cadillac DeVille 4.6L speedometer VIN: 1G6KD52Y7V
sometimes speedo reads 0 other times speed varys up & down at same mph, tech2 reads mph steady, cruise control works ok. how can you measure signal at head? Alldata says 4000 pulses per mile?
1998 Cadillac Eldorado ESC 4.6L Wipers VIN: 1G6EL12Y8W
Hello, the wipers on this Cadillac don't work on pulse or low. On high they rotate through the park cycle, which means they go up & down about 3 inches. We replaced the pulse board and the motor both with AC Delco parts. Still same symptoms. The switch seems t...
1991 Chevrolet Camaro Z28 5.0L Cuts out VIN: 1G1FP23F6M
This vehicle came in a month ago for a no start condition. I asked for your help back then and correctly identified the problem as bad (shorted) fuel injectors. Replaced injectors and vehicle ran great for 3 weeks. Now it's back. It will start right up and r...
1995 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on
hard start runs rough when cold after it sits overnight.Code for low map voltage.Scanner reads .02 volts for ,MAP signal KOEO.Disconnect MAP sensor 5 volt ref present .Jump ref voltage to signal at MAP sensor scanner still reads .02 volts.Disconnect ecm A conn... Trouble codes: 36 (map voltage low)
2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDI13WXY
guys, po442-evap small leak, i have replaced the purge valve, and smoked the evap system, cannot find any leaks,car is really rusted underneath, what am i missing, Trouble codes: P0442 (evapmall leak)
2003 Chevrolet S10 2.2L shifting VIN: 1GCCS19H83
s10 pickup with nv 1500 intermittantly have to hunt for 3rd aqnd fourth gear shifts fine most of the time feels like shift rail not lining up does not grind ihave trans dissasembled no ovious wear any help would be appreciated
2004 Chevrolet Colorado Sport 3.5L No Start, Stall VIN: 1GCCS19684
Customers complaint was engine dies intermittently dies at stops, start and immediatly die, no crank, check engine light on, power reduction message. Scanned and found multiple codes CO899, V1064,PO601A, PO601. Suspect bad PCM, archives have simalar fix with n... Trouble codes: C0899, V1064 (Communication Loss with BCM), P601, P0601
2004 Chevrolet Silverado 1500 LT 5.3L mode door actuator VIN: 2GCEC13TX4
System will run self calibration. Mode door actuator moves but will not take control head changes. Do not have access to Tech 2. Thanks in advance for any help.
2005 Chevrolet Silverado 1500 HD 6.0L front drive axles VIN: UNKNOWNVIN
When driving the truck from 30 mph up to 80 mph, the 4wd actuator in the front differential slightly engages enough to cause a vibration and grinding noise in the front axle. If you slow down to about 5 mph, it will disengage and the noise will stop. Seems to ...
2007 Chevrolet Aveo LS 1.6L instrument lamps VIN: KL1TD56667
vehicle came in with no tail lamps , customer had jumpstarted car & hooked up reversed . found bad underhood fuse box , after replaceing fuse box all lights except dash lights work and fuse does not blow , mitchells wiring diagrams show a splice pack 101 that ...
2008 Chevrolet Uplander LS 3.9L moaning VIN: 1GDNDV2310
this is a company van sterring whining all time not noticed at idle much replaced pump with rem gm pump twice & aftermarket once replaced rack & pressure hose installed synthetic fluid bleed severald recomended ways . it is same after all of this help thanks
2008 Chevrolet Suburban 1500 LT 5.3L tpms,remote door locks VIN: 2GCEK19J08
tried to program receiver with tis, programming failed with error codes line 04 operation 53 error code 00, line 05 operation 53 error code 00. does anybody know what these errors are and what to do now?
2003 Hummer H2 6.0L Cabin Air Filter VIN: 5GRGN23U03
I've a Hummer H2 2003. Also I've selling and repair service 7 years for Hummer. Now can not find the Hummer H2 Cabin Air Filter. Inside the cars air is so dusty and smile. I want to replace the Cabin air filter. But couldn't find the filter. Is there have a fi...
2001 Pontiac Grand Am GT 3.4L Hesitation, Surge, Cuts out VIN: 1G2NW52E21
Car will act up at 65-70 mph and in town in second gear at 30 mph usually about 2000 rpm, after backing off accelerator and slightly getting into the pedal about 12% tps. Then car will buck and audible backfire from exhaust, car surges an older mechanic from t...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal LS 3.8L Cuts out, MIL Lamp on VIN: 2G4WB52KOX
Well I think this one is fixed. I did find a couple problems one the reman maf was no good so replaced it with a brand new delco the other problem was I did find a couple small vacuum lines leaking a very small amount the car have been gone from the shop now f... Trouble codes: P0133, P1133, P0171.
1987 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2183H
I won't see the car again till spring. Winter in Minnesota Salt. I will post again when I get it back. Car runs OK but CEL comes on after driving. Lean code. I went over everthing again. May be ECM ?. Trouble codes: 44 (O2 lean).
1996 Chevrolet S10 2.2L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 1GTCS1947T
The timing was off three teeth. Replaced timing chain set. Ran like new. Thanks for all the help. Trouble codes: P0172 (fuel system rich bank 1).
1997 Chevrolet Blazer LS 4.3L Hesitation, Cuts out VIN: 1GNDT13W0V
hmm well this one was a difficult one to diagnose but we finally found what was causing it to have problems. First of all- I replaced the plugs in it- i pulled out bosch platnum 2 prong plugs (known problem for misfires) then replaced them with delco plugs. Ne... Trouble codes: P0300 (random misfire- in fail since cleard menu on genisis scanner).
1999 Chevrolet Astro 4.3L heating VIN: 1GNDM19W3X
Thanks to all who replied, I took your advice and flushed the entire cooling system several times then topped it up with fresh (universal type) coolant.I then installed a bleeder device in one of the heater hoses to assure that there was no air blocks in syste...
1999 Chevrolet Blazer 4.3L valve train VIN: 1GNDT13W1X
Never seen this before. The lifters would not depress so they held the valves open. When we removed them from the truck, we could compress them with only finger pressure. But when we rigged them to squeeze in a vice, out came the pudding. We pumped the stuff o...
2000 Chevrolet Blazer LS 4.3L Misfire VIN: 1GNCT18WXY
replaced mass air flow miss went away. going to drive for a couple of days to make sure thanks for all the help everyone.hope to help out in future. Trouble codes: P0300, P0304.
2004 Chevrolet Monte Carlo SS 3.8L Hesitation, Surge, Cuts out, Stall VIN: 2G1WX15K74
well thanks for all the advice. I double checked my fuel reading and while it is low, it didnt feel like a fuel miss. we kicked it to the dealer to warranty the pcm, they kicked it back stating the maf connector had loose pins. we installed a new connector wit...
2005 Chevrolet Corvette 6.0L MIL Lamp on, reduced power VIN: 1G1YY24U45
After 200 miles with no repeat of code calling it fixed. Due to the intermittent nature finally got a clitch in throttle body with scope, replaced throttle body so far no problem. Thanks to those who took time to reply. Trouble codes: P2135.
2007 Chevrolet Silverado 2500 HD LT 6.0L Starting VIN: 1GCHK23U87
1993 GMC C3500 Sierra 6.5L knock VIN: 1GTHC33F4P
Hello and thanks for the replies, The truck had left for Florida a week ago from Vermont and has made the trip successful. the knock at idle is still there and had not gotten any worse. Truck used about 1/2 qt of oil in 1900 miles and no coolant. The customer...
1994 GMC K1500 Sierra SL 5.7L 1-2 shift VIN: 1GTEK19K2R
Talked to the customer about dropping pan for more cks and it was a go. Upon pan removal I noticed very little dark fiber residue but the fluid had a dark color to it. I also noticed the magnet had a good pile of silver sludge on it. I ckd the band for what I ...
1996 GMC K3500 Sierra SL 6.5L cruise VIN: 1GTHK34F5T
Well the 5 replies I got were very much appreciated but were not the fix, There was only one PDM module for this system so it could not be the wrong one, there was no trans codes and no tcc slip, There was no AC voltage, it would screw up with alternator unplu...
2001 Oldsmobile Alero GL 2.4L Poor Idle Quality VIN: 1G3NL52T31
Well, thanks for all the good replies, after checking everything, determined that PCM needed to be replaced, however car ran ok other that high idle so customer decided not to fix. Will update if car ever comes back in to be fixed. Trouble codes: P0122, P0420, P0440 (Evap fault), P0530.
2004 Oldsmobile Alero GL 3.4L blower motor
I replaced the blower motor and resistor again. no leaks at the cowl and no leaves. The blower motor connector had a bad connection on one of the wires, replaced that and we will see in 14 months. Thanks for the help.
1994 Pontiac Sunbird LE 2.0L Cuts out, Stall, Misfire VIN: 1G2JB54H2R
wow do i feel dumb! i ended up road testing car with the st-125 spark checker and under a load when moving forward only he spark would become erratic. replaced coil/ign control module assy. wow fixed and returned to cust. thanks for all your great sugestio...
2001 Pontiac Grand Am GT 3.4L pass key VIN: 1G2NW52E51
Thanks to everyone for the replies. Customer did not want to bypass pass lock so I replaced ignition lock and sensor. So far so good. I did perform the bypass on a vehicle I have for sale and it worked great . Thank you EBTAFFS for e-mailing the instructions....
1997 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZK527XV
thanks for all the help with this saturn, we installed new "oem" wires, coils, module and plugs pretty costly but it solved the problem i'll rember this one in the future because we were lost on this one. thanks again. Trouble codes: P0341.
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