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Prev Professional Automotive Repair Technical Discussions for March 14, 2012
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Open Help Requests for GM
Help Request Answers
1972 Chevrolet C10 Pickup 6.6L Starting VIN: CCE242S140
Truck came to the shop with wiring issues,i need help with wiring diagrams,i need to rewire a alternator with integrated voltage regulator,also the head lights,and to rewire the ignitiion switch,please help to get wiring sachematic and advice,thank you
2000 Chevrolet Blazer LS 4.3L Multifunction sw VIN: 1GNDT13W4Y
To replace this multifunction and T/S switch I need to remove the SIR air bag from the steering wheel but it doesn't have any bolts holding it on. I can't find any release buttons or probe holes to release bag from steering wheel. Can someone please tell me h...
2000 Chevrolet S10 4.3L 4wd Hi VIN: 1GCCT19W6Y
This truck came in a month ago with no 4wd hi function . 2wd hi and 4wd low worked fine. After 2 encoder motors and 2 tccm still have the same problem . You can uplug the tccm and it will work perfect for few days. I do electronic wiring repairs on a daily bas...
2002 Chevrolet Trailblazer LT 4.2L No Start VIN: 1GMDT13S72
Hey guys, this one happens only once a day, The owner gets in the truck drives about 1 mile, to pick up a pizza, gets back in the truck and whamo! trucks cranks BUT will not start, IF he pumps the gas pedal it will then start and many times the idle sticks ar... Trouble codes: N0NE
2003 Chevrolet Tracker LT 2.5L Headlights VIN: 2CNBE63403
Hello everyone,Thanks in advance, I am pulling my hair on this one. I have high beam headlights when I pull headlight lever back toward me key on or off. I also have headlights durning the daytime while the engine is running only. I have no headlights at night...
2003 Chevrolet Malibu LS 3.1L Hesitation, Surge VIN: 1G1NE52JX3
No history on this vehicle. Car runs great at idle and free revs in [...], until injector cutoff. Has same symptoms as exhaust being plugged, but exhaust has good flow. Wondering if an intermittant 24x crank signal could cause this sag on acceleration? Trouble codes: P0300 (Random misfire-this code is intermittant and have miss history only on cyls 2 4)
2004 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK19Z54
hey guys, i have this chev truck in with terrible idle, scanned for codes p0300 the watched miss fires on #2&4 pull plugs and #4 is wet with fuel #2 was dry , swapped for new. checked spark ok fuel pressure ok compression ok injector leak down test ok. Fired u... Trouble codes: P0300 (Random misfire)
2005 Chevrolet Suburban 1500 LS 5.3L Coolant Level VIN: 1GNFK16Z75
I have a vehicle that every couple weeks is down about half a gallon on coolant, I have pressure tested 3 different times and cannot find any visible leak, nothing coming out of either front or rear heater drain tube, nothing coming from water pump gaskets whe...
1999 GMC K1500 Suburban SLE 5.7L Misfire VIN: 3GKFK16R9X
Vehicle has small mis fire at 55 to 60mph only going up a grade. Checked fuel pressure and was with in specs. at koeo and at koer. With fuel gauge on driving vehicle up a hill fuel pressure would flucuate at 48 to 52 psi and the gauge needle would go crazy. Re...
1994 Pontiac Grand Am SE 2.3L oil pressure VIN: 1G2NE1532R
She came in overdue for oil change, 7,000 miles over due. Car was running fine when leaving. Would not start next day, day after started, but misfiring.Brought it in and sounded like it was missing a cylinder or two cranking.Have had experience with high oil p...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet C1500 Cheyenne 5.7L Odor VIN: 2GCDC14KXJ
OK thanks for all the input. Hot day in Chicago 82 today. Vehicle came back today for inspection and update. No odor since Saturday. The radio box under the dash was replaced by us a couple years ago because of the water corrosion issue from the antenna wire. ...
2002 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W72
thanks for all the help on this one - the closest replys were replacing the chain with tensioner and replacing the engine - we had installed the chain tensioner but not the gears and chain because the chain was not worn into the bottom of the gear teeth - we a...
2002 Chevrolet Silverado 3500 6.6L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GCJK33172
Fist of all I did have the injectors dealer replaced wrong - they replaced #1, #3, #5 and #7. I did replace all left side injectors. I always suspected #5. I don't know if my tech got a bad compression reading in #5 or just messed up. Removed valve cover and i...
2003 Chevrolet Trailblazer LTZ 4.2L Hesitation VIN: 1GNDS13SX3
Did you ever relize that you had made a misdiagnosis by thinking you had? Well I did. I had a new convertor in the shop and talked myself out of installing. Flow did not suit me but I had a relaps on this vehicle not reving up in neutral causing the low flow. ... Trouble codes: P0172.
2004 Chevrolet Classic 2.2L Bcm Warning Lights VIN: 1G1ND52F74
To all who have replied, thank you for the advice. Clock spring was not broken, vehicle had shorted bcm, after talking to customer found out brake light has been on in car for about a year and would not go out. when you jump the switch it would stay on. Brake ...
2008 Chevrolet Express 1500 5.3L runs great no codes VIN: 1GCFG15438
Hey, Thanks everyone for your help. Unfortunatly I'm not going to be able to fix the van. The owner needed it back. However[ i did get to drive it again this morning and I watched scan data a little closer and the ETC while at highway speeds only got to 185 to...
1990 GMC C1500 Sierra SLE 5.7L Poor Idle Quality, Cuts out VIN: 1GTDC14K5L
Thanks to all who helped me with this one. I started by cleaning the ground connections. The ground at the thermostat was corroded. Cleaned up all the grounds but still had the problem. Checked the powers and grounds at the ECM and no excessive voltage drops w...
2005 GMC Sierra 3500 SLE 6.6L low power VIN: 1GDJC33275
First thank you to Monty, Jerry, Skip and Greg for taking the time to help. Injection pump was the cure. Good pressure but low volume under load was the problem. And to 1 suggestion, this truck does not have a programmer, checked with SPS and calibrations matc... Trouble codes: P1093.
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