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Prev Professional Automotive Repair Technical Discussions for October 27, 2011
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille 4.6L vent valve VIN: 1G6KD54Y8X
hello guys, this 1999 cadillac deville came in with a check engine light (PO446). after diagnosing the car, i replaced the vent valve. light went away for four days, then came back on. customer brought car back, had the same PO446 code. changed the fuel tank p...
1989 Chevrolet Camaro Iroc-Z 5.7L Poor Idle Quality, Misfire VIN: 1G1FP21F4K
Hi This Camero is driving me nuts. It will start and run fine when the engine is cold. As soon as it reaches operating temp it develops a misfire. I have done all the the basic tests. Fuel pressure, Injector balance, vacuum leak. Removed valve covers to check ...
2001 Chevrolet S10 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDT19W51
Hi Guys, This vehicle came to me from a local dealer. They had a reman long block installed,previous engine overheated. New ignition parts. They also installed a new IAC Valve. The truck idles rough hence the P0300. It has OEM ignition parts. Fuel pressure goo... Trouble codes: P0507 (Idle speed High), P0300 (Random Multiple misfire)
2002 Chevrolet Monte Carlo LS 3.4L Stall, No Crank VIN: 2G1WW17E82
No crank, when starter system is bypassed, starts, then stalls. Security light does not flash, can comm w/BCM. When you turn the ignition to start, the cluster warning panel goes blank, and you only hear a click at the fuse block, then 3-4 seconds later it com...
2002 Chevrolet Blazer LS 4.3L Misfire, MIL Lamp on VIN: 1GNCT18W52
Hey Fellow Techs. This blazer will set P0300 every road test. Class A Miss Fire so Check engine light is flashing during cruise. Vehicle runs great do not feel any misfire during cruise. Counters on scanner say #4 and #1 the worse. Replaced plugs,cap,rotor,wir... Trouble codes: P0300 (Random misfire)
2003 Chevrolet C4500 Kodiak C4C042 6.6L Injector hole coolan VIN: 1GBE4E1173
Truck came in with smoke blowing out the tail pipe smoke smell was like diesel told customer needed to open and check injectors pulled off driver side injectors found o-rings to be stretched and out of place pulled other side had hell trying to pull 2 injector...
2006 Chevrolet Colorado 3.5L front diff VIN: 1GCDT136X6
I have a customer who just bought this 2006 chev colorado and the 4x4 is not working. when you try to put it in 4hi, 4low or neutral the light of what you have selected will flash. The transfer case does switch just fine but the front axle will not lock up. Th...
2006 Chevrolet Equinox LS 3.4L no abs, no traction control VIN: 2CNDL13FX6
abs and traction control are INOP
2009 Chevrolet Equinox LS 3.4L computer monitors VIN: 2CNDL13F09
Vehicle will not pass NYSE due to (2) monitors (EGR and Oxygen sensors) Proceeded with a computer reflash (No change). Checked charging and starting system. Cranking voltage remained above 9.8 volts. Replaced computer and flashed with latest update. Evap bay t...
1997 GMC C3500 Sierra SL 5.7L Brake Pedal VIN: 1DGJC34R6V
97 3500 cab&chassis came in w/ low brake pedal red brake warning light coming on when brakes applied, but stopping the truck. Pedal firm near floor. Parking brake good- holds truck on hill even in reverse. Has had new front pads and are properly seated. Truck ...
1995 Pontiac Bonneville SE 3.8L No Start, Cuts out VIN: 1G2HX52K4S
Hello Everyone, We have a 1995 Bonneville with an odd problem. After starting the car for the first time of the day, it will idle fine. As soon as you try to give it a little gas, the idle goes up to 2,000-2,500, you hear a popping, and it cuts out. After tha...
2003 Pontiac Sunfire SE 2.2L Lighting VIN: 3G2JB52F23
came in with no low beam headlites , bulbs are okay , have power to both sides of the low beam and high beam the high beams work but no low beams or daytime running lamps , went through the check chart and it says to replace the multifunction switch tried that...
2001 Saturn L300 3.0L Heater VIN: 1G8JW54R41
This vehile will not blow heat thru heater core. All functions work except no heat. If we put pressure tester on system heat will work. No evidence of head gasket or external leakage. Have tried to bleed system. Replaced heater core, water pump and thermostat ...
2003 Saturn Vue 2.2L sunroof VIN: 5GZCZ23073
hey guys, just replaced a leaking throwout bearing and clutch master cylinder on this vue. now customer reports that the asc light on the sunroof is flashing all the time, roof works fine. the only thing i know of is i disconnected the battery to remove the st...

Fixes & Summaries for GM
Fix/Summary Answers
2007 Cadillac DTS 4.6L right power window VIN: 1G6KD57YX7
Customer was here yesterday qand said the dealer reprogrammed the bcm. Thanks for all replies.
1997 Chevrolet Express 1500 5.7L Hesitation, MIL Lamp on VIN: 1GBFG15RXV
Thanks to everyone who posted! The vehicle is fixed for now.Fuel pressure was too low.Different fuel pump modules were replaced,multiple fuel pressure regulators were installed as well as a complete injector asssembly.No local vendors had an adjustable regulat... Trouble codes: P0171 (Fuel trim lean), P0174 (Fuel trim lean).
2000 Chevrolet S10 4.3L MIL Lamp on VIN: 1GCDT14WXY
Well guys, I started from the beginning. I replaced both the fuel pump and the pressure regulator with GM factory parts. I also put in a fresh set of upper plenum gaskets while I was at it. Wouldn't ya know it, the fuel pressure is in spec, and the fuel tri... Trouble codes: P0171, P0174.
2002 Chevrolet Silverado 3500 LT 6.6L message center VIN: 1GCJK33102
OK, this beast is fixed! There is no info on testing the low coolant alert system on this truck in Mitchell. Most of the replies I got said to check for short to ground somewhere in the wire harness between the pcm and the coolant switch in the tank, as it tur...
2007 Chevrolet Silverado 1500 LT 5.3L Hi speed LAN VIN: 1GCEK19J57
its fixed,thanks to all who replied me special thanks to Mark from Iowa,Dan asked why the fuse did not blown I do not know you can ask GM , the cause is VCIM I by- pass the module all module are communicating great. the thing which make me confused or did not ...
1997 GMC Jimmy SL 4.3L Trans. Fuse #24 VIN: 1GKDT13W5V
This 1 is fixed and out the door. I had noticed that the ignition key would not always go to the lock position. I replaced the key and tumbler with the same results. I checked the electrical part of the ignition switch. The suggestion from Lee in Maryland was ...
2008 GMC C5500 Topkick C5C042 6.6L MIL Lamp on VIN: 1GDE5C1958
It has been almost a month with no problems so I'm going to call this one a fix. Replacing the MAF along with the pigtail was the fix. Those who recommended having the PCM reflashed have a valid point especially with the EGR recall reflash; it's real easy for ... Trouble codes: P0101 (MAF sensor performance).
1990 Oldsmobile Cutlass Calais S 2.3L Misfire VIN: 1G3NF14D1L
i put a ac delco coil tower on and it fixed it.sorry i took so long to post a fix. i appreciate the help. keith
2000 Oldsmobile Intrigue GL 3.5L MIL Lamps VIN: 1GWX52H8YF
Owner has decided not to fix this automobile. Thanks to all for your help. We did decide it does appear to be a ECU problem.
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