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Prev Professional Automotive Repair Technical Discussions for January 9, 2009
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Open Help Requests for GM
Help Request Answers
1993 Chevrolet Cavalier RS 2.2L No Start VIN: 1G1JC5444P
have this 93 cavalier have fuel and air no spark at all got ign module tested at local parts store tested ok looking for some insight on this on wondering if possible ecm issue all fuses check out ok and vehicle has a good crank previously had a long crank als...
1996 Chevrolet S10 2.2L No Start VIN: 1GCCS1442T
2.2 timing marks wont stay lined up runs good after awhile i shut it off starts good but runs lazy,pull timing cover &check marks off 1 tooth or maybe little more,my question to you guys could it be worn cam lobes or possible lifter problem heard 2 different t... Trouble codes: P0335, P0341
1997 Chevrolet Express 1500 5.7L Hesitation, Surge VIN: 1GNFG15R1V
Customer brought vehicle in for a check engine light diagnostic. She also stated it was "surging" and "missing". We ran the codes and got a p0300 and a p0132. The intake was also leaking coolant. We replaced the intake gaskets with the updated units, as well a... Trouble codes: P0300, P0132
1997 Chevrolet S10 2.2L No Start VIN: 1GCCS1445V
engine came in with misfire and no heat. Found blown head gasket. Once head was removed we found piston 2-3-4 were cracked and pieces off the tops. Installed short block and re-worked the head, it did have two bent intake valves. When we installed short block ...
2000 Chevrolet Blazer LS 4.3L engine VIN: 1GNCT18W9Y
Vehicle towed in no start, just cranks slowly and bucks and backfires sometimes. Found fuel pressure at 65 psi cranking and does not bleed off. Sprayed intake cleaner into throttle, still no start and backfires. Vehicle did start after leaving in shop overnigh...
2000 Chevrolet Blazer LS 4.3L transfer case / diff VIN: 1GNDT13W5Y
Symptoms: Vehicle will not go fully into 4wd and Service 4WD light comes on. The lights on the 4WD buttons flash constantly when I try to put truck into 4WD. When I try to use the Auto 4WD feature, the "Service 4WD" light comes on and it sets code C0374. I ca...
2003 Chevrolet Tahoe LT 5.3L control module VIN: 1GNEK13Z83
Each time vehicle is driven a different position is indicated on the 4wd control switch on dash. Multiple trouble codes, will list all 16 at end of message. Replaced transfer case control module, could not communicate with the new module. Assumed bad part. Fla...
2003 Chevrolet Trailblazer North Face 4.2L Cuts out VIN: 1GNDT13S43
hi friends. i could use some trend info here. intermittent engine quit. will restart. no codes, and very hard to determine if im losing fuel pressure before it dies. so, i could use some help before i tear into it thanks all
2004 Chevrolet Malibu Maxx LT 3.5L Factory Remote Start VIN: 1G1ZU648X4
This Malibu has factory remote start which is intermittently inop. It is setting several codes which disables the remote start system. U2125, U2171, B1325, U2107, P0520, P1877. When we have the car in the shop, all the codes check out ok, no problems found. Cl...
2006 Chevrolet Avalanche 1500 LS 5.3L abs pump VIN: 3GNEC13T32
Heres a good one. Have a 2006 avalanche 1500. problem is that abs pump stays on all the time. Has 2 codes, C0267 pump motor shorted/open, c0297 pcm control fault. I checked and cleaned the ground on the frame under drivers door. I have 13 volts into module. I ...
2008 Chevrolet Silverado 3500 HD WT 6.6L MIL Lamp on VIN: 1GCJK33608
This a very long story which starts with truck going to two GM dealers and they can't figure it out. As soon as you start veh. and drop it into drive the check engine light comes on and sets a P0101. The dealers have replaced exhaust system, MAF sensor, PCM, E... Trouble codes: P0101 (Mass Air Flow Sensor circuit A)
1993 GMC Safari SLE 4.3L Poor Idle Quality VIN: 1GKDM19W4P
This vehicle came in with al the symptoms of a defective fuel regulator, it has one of those spider web injection systems. The engine runs ok once you take it above an idle. At an idle it runs poorly. I dug out my old scanner and omg what a mess, you see the c... Trouble codes: 43 (ecs failure), 34 (map sensor), 51 (prom error), 45 (02 sensor), 42 (est monitor), 41 (cylinder select error)
2004 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKFK66404
This truck has been in our shop many times for this problem. They lived on a dusty road so i did the service bulliten on it. It has freeze frame data that shows tank press. at 3.5 volts but when I check it it always is with in .2 volt of 1.5v. purge and vent w... Trouble codes: P0446
1992 Oldsmobile 98 Regency 3.8L rf caliper VIN: 193CX53L5N
The problem is a continued supply of air in the right front caliper. Customer was complaining of a spongy pedal. After inspecting we found rear wheel cylinders leaking some and front hoses cracking. customer wanted to replace cylinders only. After replacing th...
1996 Pontiac Sunfire SE 2.2L thermostat VIN: 1G2JB5240T
Came in running in the red zone, customer had to top up AF before driving. Pressure tested cooling system, removed spark plugs and no coolant leaking into cylinders, pressurized cylinders to 100PSI no air leaking into cooling system. Found small leak @ upper r...
1998 Pontiac Grand Prix GT 3.8L ABS Module VIN: 1G2WP52K6W
Vehicle has intermittent ABS & Trac control. Abs Light off, all works as advertised. Drive some times short, some times long distance, ABS & trac light will come on. I get no communication with Snap On Modis ABS light on or off. so no codes or info. Test at Ab...

Fixes & Summaries for GM
Fix/Summary Answers
1984 Chevrolet K20 Suburban Custom 6.2L Surge, Wide open throttle! VIN: 1G8GK26J2E
thank you all! most of you got it right. I removed and reset the shut off solenoid lever and it runs good. I am greztful for your help. I got lucky that it didn't self destruct, USE CAUTION IF YOU DO THIS KIND OR WORK!
2001 Chevrolet Monte Carlo LS 3.4L MIL Lamp on, A/C INOPERATIVE VIN: 2G1WW12E21
After following the the procedures to check the pins on the BCM connecters I pulled the BCM out of the car and checked the numbers on the unit it had a GMAB166 on it, from the response I received I knew that this unit was a likely problem, I also found out fro... Trouble codes: U1064 (communications error).
2002 Chevrolet Express 2500 5.7L vibration VIN: 1GTGG25RX2
thanks for all replies, steve may have the answer.after rechecking to see what we were missing, i noticed that the grille & shrouding fit poorly & the lower rad. support. advised customer to go back to body shop or see mr. goodwrench, which he apologized for p...
1996 GMC Jimmy 4.3L MIL Lamp on VIN: 1GKDT13W3T
Thanks For All The Help,After Posting This Help Request I Comanded EGR At All Different % For EGR Valve And It Timed Out About The Same Time For Each Percentage Level.I Also Noticed That The EGR Was Only Moving For The Percentage Levels 10 - 80 After That It W... Trouble codes: P1406.
1997 GMC Jimmy SL 4.3L rear window VIN: 1GKDT13W9V
2003 GMC Sierra 1500 4.8L Poor Idle Quality VIN: 1GTEC14V83
The vehicle had a bad throttle body, cleaned it and worked a little better. Replaced it and the problem was solved.Thanks for all the help, I knew that on a 6.0L gas engine this could be cleaned or replaced, but I did not realize that the 4.8L was pretty much ...
2006 GMC Yukon Denali 6.0L Rear HVAC temperature blend door actuator VIN: 1GKEK63U96
Unfortunately the GMC remains the same. I appreciate all the suggestions and the time members took to assist. I told the customer to be patient (he is) and bear with me. This is not a done deal. I will get the truck back here when he can afford to lose it f...
2006 Saturn Vue 3.5L Misfire, MIL Lamp on VIN: 5GZCZ63406
I'm posting a summary as time is running out and this vehicle is no closer to fixed than when I started. I will post a fix when it eventually happens. Several people have suggested EGR as a possible cause of the misfires on this vehicle, but after making a pla... Trouble codes: P0300 (Misfire cyls 2 and 3 are misfiring).
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