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Prev Professional Automotive Repair Technical Discussions for February 5, 2008
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Open Help Requests for GM
Help Request Answers
2002 Buick Park Avenue 3.8L horns VIN: 1G4CW54K32
horn always on disconnected connectors at steering column,rcdlr,onstar viu, rear fuse block connector. Seems to have short to ground between rear fuse block and horn relay in underhood fuse block {relay control circuit}. Thanks for any and all help.
1990 Chevrolet R1500 Suburban Scottsdale 5.7L 35 mph & above red brake light on VIN: 1CKER16K7L
we need help. we are having a problem with a 1990 chev.suburban. brake light comes on @ 35 mph.& above.brake light goes out when ignition is off. flash codes are 6/9/10. we have replaced brake module,speed sensor @ transmission.checked trailer wiring (good) - ...
1995 Chevrolet S10 LS 2.2L Misfire VIN: 1GCCS1941S
Good evening to all the good techs out there! I'm loosing what little hair I have left on this little S-10 with a stubborn misfire problem. It has 2 dead cylinders; #'s 2&4. Ignition system shows good on the scope and I have good spark to both plugs (will jump... Trouble codes: 44 (lean exhaust)
1996 Chevrolet Blazer 4.3L Brake Lites VIN: 1GNT13W3T2
Working on 1996 Blazer (t series) No brake Lites. Wiring at switch melted up in behind dash Removed dash and installed new harness and switch. Still have a short somwhere. Am looking for a good body wiring diagram for this vehicle as Mitchell and All data do n...
1997 Chevrolet C1500 5.7L Cuts out, hard cranking VIN: ZGCEC19R6V
Hey guys, Thanks for your help in advance. The truck came in with a starting problem and it had ruined the starter and flywheel. I replaced the starter and flywheel and crank sensor. It had a major tune up about a month ago. The truck left and all was well un...
2000 Chevrolet Impala 3.8L pass lock VIN: 2G1WF55K8Y
Thanks for your time. The car was towed in ,owner could not turn the key. We replaced the lock clyinder and key. The key now turns but the car will not crank over. There is power coming out of the igition switch to the pcm crank fuse. We can't seem to get the ...
2001 Chevrolet Tahoe 5.3L Underdash heating unit VIN: 1GNEK13T01
We now have cold air getting into the cab from under the dash. I beleive we have two problems posibble. First the air is coming from the cover where the cabin filters are located. I have one on order for tomorrow. The other issue is i think there is a possible...
2002 Chevrolet Tracker ZR2 2.5L pump VIN: 2CNBJ73472
hay chevy techs i have a problem i have 2002 tracker here im not a trans guy so any help you can give would be great i put a motor in this thing and it runs great but when i lifted it in the air the trans had a pretty good leak so i pulled the trans and replac...
2002 Chevrolet Express 1500 4.3L Steering VIN: 1GCEG15W72
Hi, We just replaced a steering gear box to fix the old leaking one. Now the van has a loud vibration that transmits through the front end while turning and moving slowly. We found that it also does it if we jack the front end up off the pavement taking the we...
2003 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J03
This vehicle has no driveability issues. The check engine light comes on pretty quickly following a code clear. Freeze frame sets at low rpm and operating temp. The real reason for this post is that the long term trim starts at 21% even after removing batt cab... Trouble codes: P00, 171 (system too lean)
2005 Chevrolet Malibu LS 3.5L Electrical Drain VIN: 1G1ZT54825
Has a 0.17 to 0.18 amp intermittent drain. May be ok for a week then drain appears for days then goes away again. If pull 30 amp fuse in engine compartment for IBCM (Body control module) drain goes away. If pull fuses in IBCM under dash does not have any affec...
2000 GMC Sonoma SL 2.2L No Start VIN: 1GTCS1957Y
while cranking.shows rpm jumping to 16,000.the crank actual is 170-220 cranking.any help would be great.i dont have much hair left. Trouble codes: P0336, P0340
2000 GMC Savana 3500 5.7L Hesitation, Cuts out VIN: 1GTHG35R9Y
HELLO, This van has had an intermittent low power almost no power like a plugged exhaust.this has been going on for about a year and a half. We installed new bosch modular pump when van wouldnt start 4 weeks intermittent problem is occuring more.. VCM ... Trouble codes: P0340, P0137, P0132, P0172
2000 GMC Safari SL 4.3L Poor Idle Quality VIN: 1GKDM19W8Y
Got a good one for you GM tech's out there.This 2000 GMC Safari with 110,000 miles is a taxi cab.When I first got to it it had already had the pcm and intake gaskets replaced trying to cure a hi idle.I'm talking 3500 rpm idle.I could tell the iac motor was the...
2003 GMC Savana 2500 6.0L abs VIN: 1GDGG31V63
Cannot figure this one out, have checked all wiring and replaced sensor and went down the flow charts for alldata, has code C0055 rear wheel abs sensor, also the sensor was replaced with a GM sensor. Please any info would be appreciated. Thanks
2003 GMC Envoy XL SLE 4.2L MIL Lamp on, NO ACCELERATION VIN: P336225221
2004 GMC Yukon Denali XL 6.0L Hesitation VIN: 1GKFK66U44
customer complains of int hesitation that will last for 4-[...]. while driving truck i duplicated the problem one time. it feelslike a dead spot on the tps. this is a throttle by wire. the app and tps did not drop out on the scanner. un fortunately it only ...
2005 GMC Yukon SLE 4.8L Electronic VIN: 1GKEK13V65
Vehicle came in after four wheel drive went into 4 low driving down the road on its own. No problem found, code 327, as a precaution we replaced the encooder motor. Today the indicator showed the vehicle in 4 wldr neutral but the vehicle was driven in. again a...
1994 Oldsmobile Silhouette 3.8L Hesitation, Surge VIN: 1GHDU06L5R
Hi All, Once again have a problem child. replaced engine because of hard knock. Transfered all original sensors and throttle body from original engine, except injectors. our problem is a bad hesitation on take off, then it goes like a bat out of hell. We teste...
1997 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G2NE52T4V
This vehicle came in running extremly rich (turning back oar black)customer stated that he had replaced the o2 sensor and fuel filter hooked up scanner o2s1 voltage at 0 in closed loop running BAD thought shorted o2 so replaced the sensor and plugs and started... Trouble codes: P0134
2002 Pontiac Grand Am SE1 2.2L anti-theft VIN: 1G2NF52F52
Had this car towed in last week with a no start. The car would crank but not start. Pulled codes B2958 and B2960, both undocumented codes on my snap-on modis. I did notice the security light flashing. I left the key in the run position during my testing and th...
2001 Saturn L300 3.0L oil pressure VIN: 1G8JW54R71
Group, Just performed plugs, oil service and filters on this 3.0 24valve engine. Customer returned few days later concerned with lifter noise in both banks. We confirmed. Oil used was 5w30 and oil filter was correct delco cartridge without nipple and o-ring l...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac Eldorado ETC 4.6L Unknown VIN: 1G6ET1296S
Got good replies. Was able to reset message, and repaired RR ABS sensor
2003 Chevrolet Avalanche 1500 North Face 5.3L MIL Lamp on VIN: 3GNEK13T53
I hooked the scan tool to this vehicle and when it gets up to temp the upstream oxygen sensor volts drop down dramatically. I replaced the sensor and all is well. Trouble codes: P171.
2004 Chevrolet Trailblazer LS 4.2L sputters VIN: 1GNDT13S14
WELL I WOULD LIKE TO SAY THANK YOU TO ALL THAT REPLIED AND A SPECIAL THANKS TO ALEX IT SEEMS MY PROBLEM WASN'T THE TAC OR APP BUT IN FACT THE 5V REFERENCE RUNNING THROUGH THE FAN CLUTCH. IT SEEMS THAT EVEN THOUGH CODE P0495 WOULDN'T SET EVERY TIME,REPLACING TH... Trouble codes: P0495 (cooling fan speed high), P2135 (tps 1-2 correlation), P2138 (app sensor 1-2 correlation), P0641 (5v ref. 1 circuit), P2122 (app sensor 1 circuit low), P2123 (app sensor 1 circuit high).
2005 Chevrolet Impala 3.8L Excessive Emissions
Thanks everyone for the input. I am posting this as a summary as I am not 100% sure it was a fix. However the vehicle has been gone for sometime and I have not heard good or bad about it. One person responded indicated excessive ripple from the alternator ...
2000 GMC Savana 2500 5.7L Intake VIN: 1GTFG25R6Y
Loctite seems to be the answer on this one... A special thanks to John from Fel-Pro for his extra help on this one. The Fel-Pro instructions say to clean the bolts and use sealer on them. New bolts from GM come with threadlocker on them (but of course the loca...
2005 GMC Sierra 2500 HD 6.0L oil pressure VIN: 1GTHK29U95
Sent a fix 2 days after help request, but will repeat. Oil pump was the fix. The relief valve/bore was worn. Two replies were right on. The others were good general oil pump suggestions. but didn't apply to crankshaft driven pump. Thanks. Nick
1997 Pontiac Bonneville SE 3.8L Drivers Information Center VIN: 1G2HZ52KOV
Thanks for your input. Not much help on this one. We checked the engine oil pressure, charging system,and coolant temp, all normal. I saw the TSB about the low fuel warning with 1/4 tank gas. This car had over 3/4 tank. This vehicle does not have class 2 wiri...
2001 Pontiac Montana 3.4L high pitch whistle VIN: 1GMDX03E41
Replace PCV harness form throttle body to PCV valve part came with new gromet for throttle body.
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