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Prev Professional Automotive Repair Technical Discussions for May 22, 2009
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Open Help Requests for GM
Help Request Answers
1992 Buick Regal Custom 3.8L No Start VIN: 2G4WB54LXN
hi hate to bother everyone out there but this thing has me just puzzled. ok first veh was towed in no start. fuel psi good. i have no spark at all. pulse 2 flashes at time then fades. no codes. no rpm signal, replaced crank and cam sensors with new, then with ...
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1986 Chevrolet Corvette 5.7L Horn VIN: 1G1YY0782G
I need the location of the horn relay. Horn is inoperative. Fuses and horns check out ok. Grounding wire behind horn pad does nothing. I am unable to locate horn relay to test further. MOD indicates relay is in the "convenience center" but I am unable to locat...
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1995 Chevrolet Astro 4.3L tcc quad driver module VIN: 1GBDM19W9S
Need your imput again please. Vehicle came in with only first gear working and owner stated had been to a quiky place to have fluid changed but tranny still wouldn't shift.Couldn't afford new or rebuild so we replaced with a used unit. Used unit seemed to shif...
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1999 Chevrolet Silverado 1500 4.3L Poor Fuel Economy VIN: 1GCEC14W4X
Costomer complains of errattic gas milage. Sometimes very good and next tank might only be half the milage of last tank. Had K&N air filter and did find excessive contamination on MAF. Cleand sensor and ran alot better. LTF went from 12% to 2%. Cam retard stay...
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2000 Chevrolet S10 2.2L tcc VIN: 1GCCS1952Y
Hello all, need direction on this chevy. The truck has no codes. drives good and all seems well. However drive truck at steady speed for long duration the tcc slip speed would slowly come up to above 100-800 rpm fluctuate around some even with tcc duty and pwm...
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2002 Chevrolet S10 4.3L Poor Idle Quality, Stall VIN: 1GCCS19W42
Ok wondering if anyone can steer me in a direction on this one. Vehicle came in about a week ago with customer complaint of vehicle stalling at stop signs. After multiple test drives monitering pids and having a fuel gauge hooked up we could not verify concern...
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2004 Chevrolet Silverado 2500 HD 6.6L fuel gauge VIN: 1GCHC23134
Hello group,got this 04 Dura Max single tank chevy truck(diesel)customer says when gauges is at quarter of tank,will run out of fuel,replaced in tank unit,not much fuel in it,drove vehicle,light came on got 3 chimes,got the low fuel message,I was only able to ...
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2006 Chevrolet Impala LS 3.5L outside temp VIN: 2G1WB58N66
Car came in for no A/C compressor. The outside temp sensor was reading -40F. I replaced the sensor know it is reading 90F. in the hvac data list. The problem I have is the DIC center still says ice possible when you start the car. That makes Hvac head say ambi...
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1993 GMC P3500 5.7L head gasket VIN: 1G1JP32K6P
This vehicle is an equipment truck for the fire dept. It idles for hours on end. The left bank head gasket is blown between the center cyls. The gasket on the right side looks to have a hot spot in the same place. I am looking for thoughts on preventing a reoc...
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1995 GMC Sonoma SL 2.2L Excessive Emissions VIN: 1GTCS1449S
this truck has high nox reading at 15 mph, the coolant temperatrue is 190'f, the fuel pressure are little high, the lambda are 1.035. af ratio 15.22, it's little lean, i double check the vaccum and exhuast twice, measure there no leak. thanks every one read th...
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2000 GMC C3500 Sierra SL 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: 1GDKC34F5Y
Lots of black smoke no power,no turbo.P0236 was hard code when came,Pinpointest wastegate solonoid,can operate with scanner on and off,have 15-17 inches of vac at boost solonoid and at wastegate,actuator and rod moves freely. Boost press always at 14-15 P.S.I.... Trouble codes: P0236 (Turbo boost control)
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2004 Saturn L300-1 2.2L brake pedal VIN: 1G8JC54F14
Help, This client came in with BRAKE PEDAL dropped out to floor, confirmed w/Technician = NO BRAKE PEDAL. Note: NO BRAKE LIGHT ON, BRAKE FLUID Full, BRAKE INPECTION = OK Road Test after vehicle was turned off = BRAKE PEDAL back to normal This problem hap...
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2006 Saturn Ion-2 2.2L MIL Lamp on VIN: 1G8AZ55F56
hi every one this one has me stumped. car came in with p0411 code found air pump filled with water not working. replaced pump ran car through is cycle after the third start light came back on . check fuses all good checked the relay near the l/f headlight had ... Trouble codes: P0411
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Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac DeVille 4.6L Cuts out, Stall, MIL Lamp on VIN: 1GN45379ID
simple stuipid fix... OLD SCHOOL GM RELEARN...put it on the wheels ...forced throttle with brake to keep it running... test drove ..came out xxxcelnt ... replaced map due to bad sensor{did not cause drivability issue} no codes ...runs like a caddy...thnx MRDRB...
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1995 Chevrolet Camaro Z28 5.7L Hesitation, Misfire VIN: 2G1FP22P7S
OK here goes. The customer had to leave on a trip and didn't want to leave it with us to find the problem. We did disconnect the EGR valve and it could still be felt. From what I know about the map sensor it is only there for the EGR diagnosis. The MAF sen...
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2001 Chevrolet Silverado 1500 5.3L Hesitation VIN: 2GCK19T7Y1
I had talked with my customer and he needs his truck back for the weekend. I had done an injection flush with the GM top end cleaner and the OTC flush canister. I cleaned the trotle body. I tried a known good MAF off my personal truck. Compared fuel pressure t...
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2001 Chevrolet Silverado 1500 4.8L 1-2 shift VIN: 1GCEK19V7Y
Thank you for all the replies. As I was waiting for replies to come in, I pulled the valve body to give it another once over. I found that the accumulator valve sleeve can go in one way or a 180 degrees off. When your 180 off the passages on the sleeve and ...
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2005 Chevrolet Silverado 1500 LS 5.3L Differential carrier VIN: 2GCEC13T35
Thanks to all who replied. We were not able to exactly pinpoint the source of the noise, but due to some damage to the surface of the pinion gear, we are assuming that the damaged face was the source of the noise. Several replies suggested that this may be t...
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2007 Chevrolet Impala LS 3.9L tpms VIN: 2G1WS55R77
Id like to thank everyone who replied. My codes off snapon scanner we took the 4 off front and put co in front of code and that gave me proper codes, then i performed the tsb 07-08-52-0001b with alot of help on the phone with Paul [...]. Must have tech 2 a...
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2008 Chevrolet Avalanche LS 5.3L fluid VIN: 3GNFK12338
THANKS TO ALL THAT REPLIED, DAN AND ROBERT FROM CAL. HIT IT ON THE HEAD. THERE IS A GM TSB FOR DIFF FLUID ODOR. AND THEY FLUSH THE DIFF AND INSTALL A SHORTER VENT TUBE FILTER AWAY FROM THE FILLER NECK TO RIGHT ABOVE THE SPARE. THIS TSB IS MORE THAN A YEAR OLD....
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1998 Pontiac Bonneville SE 3.8L Blower motor VIN: 1G2HX52K8W
I havent actually fixed this problem yet, customer short on funds. She just had a kid. That will do it. Jon [...] let me know that the resistor is in the module and...
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