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Prev Professional Automotive Repair Technical Discussions for October 15, 2008
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1993 Cadillac DeVille 4.9L Electronic climate control display VIN: 1G6CD5386P
I disconnected and removed the battery to replace the a/c condenser. When I reconnected the battery and now the climate control panel and the fuel data center just display a C in the display area. I can't check for code bacause you use the displays to check th...
2002 Cadillac Escalade 6.0L rpa system VIN: 1GYEK63N22
good morning,i was wondering if there was anybody out there that has worked with this rear park assist system,and if so mite have some pointers on what it mite be or just any help at all. thanks to all.
2003 Cadillac DeVille 4.6L Poor Idle Quality, Stall, Misfire VIN: 1G6KD54Y83
G.M. Techs your knowledge is needed.I have lost my --- on this one. Did have a bad vaccum leak,quick bucks, yea right 5 days later,1-3-5-7 missing randomly,compression chk. all above 140. Found T.S.B. on reprogram called dealer been done, hoping to pawn it on ... Trouble codes: P171, P174, P300, P506, P507
1979 Chevrolet Corvette 5.7L heater/turn VIN: 1Z8789S402
I am looking for wire diagrams for the heater blower motor circut,turn signal, and power window circut. This Corvette has been sitting for years does not look like any tampering has been done to it and the owner has no idea how long they have not worked. Low m...
1988 Chevrolet C1500 Cheyenne 5.7L throttle sticks VIN: 2GCDC14K2J
Gentlemen I have this pickup that has a sticking throttle on tip in. Having many of these over the years I figured this was a simple clean or worn shaft. As it turns out with the engine off there is no hint of a problem. Only with the engine running do you ge...
1990 Chevrolet K1500 Cheyenne 5.7L Axle shaft
This is my personal vehicle. Was leaving work yesterday and turned out and hear a lound skipping clunking type noise like and really bad axle shaft. Noise would come back after turning corners. Noise would be heard for a couple of seconds than the skip would s...
1995 Chevrolet K1500 5.7L parking lights VIN: 1GCEK1XS9K
hi guy my abs ses and seat belt light are on and the fuelpump relay runs the 3sec prime with the ignition key removed if i pull the parking light fuse it all goes out i can drive the truck with no problems but have no parking or dash lights if i put the parkin...
1996 Chevrolet Cavalier 2.2L want come on VIN: 1G1JC1248T
can turn fan on with scanner, and seeing that cts is out of range by 5 degrees, can also turn fan on at relay and testing there right now, it want come on at 210 degrees.Where looking to see if computer will ground relay, if it want?
1998 Chevrolet S10 LS 4.3L Cuts out VIN: 1GCCS19X6W
Hello I need some gm help. This is my sons truck and we have tried to get a lot of "known problems taken care of before he left for school 200 miles away. The truck shut off once 3 months ago after a 100 degree 1 hour trafic jam. Whent to pick up and it starte...
1999 Chevrolet S10 4.3L No Start VIN: 1GCCS14X0X
Vehicle runs great with new parts and runs great all the way up until it stops running. Every time we find hole burnt in rotor. We r&r distributer and checked gear wear and none found. Vehicle has only 66000 miles on it. We used premuium Echlin ignition parts ...
2001 Chevrolet Silverado 1500 5.3L No power under load VIN: 2GCEC19TXY
Owner states that truck ran great after high school shop cleaned fuel rails and replaced fuel pump but has returned to old ways. Truck idles great and no service engine lamp on. Truck will move out good from a stop but at about 35 MPH will top out. Acts like n...
2001 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK52871
Yet Another problem child. 2001 Chevrolet Prism. replaced catalytic converter 2/07 due to P0420 & after temp test converter was not working. now customer has returned with check engine light on again, and low and behold, code P0420 has returned. temp tested co... Trouble codes: P0420 (Catalyst Effiency below threshold)
2001 Chevrolet Blazer LS 4.3L Stall VIN: 1GNDT13W51
This vehicle shuts off when shifter is put into park intermittantly
2002 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC52492
This has me baffled. Vehicle came in with CEL on and a P0442 code. Checked it out with tech 2 and it was leaking down with the system sealed. I smoke tested the system and found I had a small amount of flow, but no smoke coming from anywhere. The decision was ... Trouble codes: P0442 (evap small leak)
2002 Chevrolet Express 3500 5.7L hard start VIN: 1GCHG35R92
The van runs great just hard to start after 5-10 minutes afterwards. Takes about 20-30 seconds of cranking to start. After running it starts right back up. Fuel pressure is in specs. Don't see much fuel pressure drop for injectors leaking. ST Fuel Trim average...
2003 Chevrolet Tracker 2.0L No Start VIN: 2CNBE13C53
Customer states that after a hot soak vehicle will not start back up.Since the vehicle has come in to the shop cannot duplicate the problem.Have test drove the vehicle shut it off then immediatly restarted vehicle no problem.Let vehicle sit for five minutes no...
2004 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T54
this truck keeps setting these knock sensor codes. We have replaced both sensors and the pigtail connector both sensors ohm out right at 99.0 pin tested computer and no resis. in wiring harness has any one seen this before Trouble codes: 327 (knock sensor), 332 (knock sensor)
2004 Chevrolet Colorado LS 2.8L blower motor VIN: 1GCCS19884
this colorado blower motor works only part time. when it does not work it doesn't work on any speed what so ever. have checked the grounds and all seem to be okay. have replaced the blower switch which comes as a complete module and have traced the wires out a...
2005 Chevrolet Impala LS 3.8L Misfire VIN: 2G1WH52K45
hi everybody i have this impalla back for the third time cracking the porcilin on cyl number 1 plug. the crack is half the length of porcelin and doesnt run from the top or the bottom. by this i mean its coming from the center of the plug outward. i see this o...
2003 GMC Sonoma SL 4.3L Hesitation VIN: 1GTCS14X03
Driving at 20mph then accelerating like to pass the rpm goes to bottom out at 6000 rpm until you let off of it(shows on the dail). On the scanner it showed 10,000rpm.Its like its not shifting up but showing this.It dos'nt happen all the time.(The tires are not...
1993 Oldsmobile 98 Regency Elite 3.8L Radio & climate control displays blank VIN: 1G3CW53L9P
Good morning. This mint 93 Olds came in with no climate control or radio illumination [display] at all. All dash and warning lights are working as is the instrument cluster illumination. Dash lights can be dimmed up/down but when it first came in the climate c...
1998 Oldsmobile Intrigue 3.8L Hesitation, Surge VIN: 1G3WH52K7W
I have a 98 olds intruigue with a 3800 engine. I did intake gaskets and replaced some sensors and ignition module. Now the car does not run well at all. It hesitates and surges constantly. This happens only under acceleration. I did the crankshaft relearn proc...
1993 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HZ52L4P
Techs: will not noid or spark fuel ok...ran test jumping out crank sensor with power and ground and while cranking should get 1.7 volts on the (H) syn sig in and I get 0 volts..MOD says wiring or bad crank sensor...wiring checks ok and hard to belie...
2003 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NG52E33
Some other data stream info. Injector plus 7.84 during cranking MAF 0.00 g/s unpluged, 4.37 g/s cranking, KOEO any where from 68.61-241 g/s (is that normal?) So car is towed in as no start and customer states it is a fuel pump. We check fuel pressure and it... Trouble codes: P0131
2001 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZG52871
This Saturn came to us with high erratic idle. Found bad intake gasket. Replaced. came back with same concern found idle speed motor. sticking. replaced. Still has same problem. At idle with ac on or off idle will shoot up to 1500 rpm hang there for about a mi...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Century Special 3.1L temp gauge VIN: 1G4AG55MXS
The problem was resolved by replacing the computer temp sensor with a 3-wire instead of 2 and using the third wire for the temp gauge. The existing temp sensor was located in a hot spot of engine that was picking up cylinder temperature rather than water temp...
2003 Cadillac Seville SLS 4.6L cyl. #4 VIN: 1G6KS54Y23
1992 Chevrolet S10 2.5L No Start, Cuts out VIN: 1GBCS10A9P
This vehicle finally went away. Not the way I would like,but none the less its gone. The post office picked up vehicle and took it to regional postal facility. (government owned)??? 4 hours away on freeway. We'll see what they find. I want to thank all tha...
1993 Chevrolet K1500 Cheyenne 5.7L Temperature VIN: 1GTEK14K1P
This one is fixed, but it's one of those cases where I'm not sure what fixed it. After removing the thermostat 3 times, replacing it once, running it without the thermostat (it never got hot), the last time I assembled it, the problem was gone. The only guess ...
1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on VIN: 3GNEC16R8T
We ended up replacing the fuel injector assembly on this one to cure it. Even after several cleanings at as much as 100psi we still couldn't get proper fuel control. Trouble codes: P0171.
2001 Chevrolet Malibu LS 3.1L Hesitation, Cuts out, MIL Lamp on VIN: 1G1NE52J71
the problem was that someone had tried to repair some wires in the harnsee and made a mess repaired wires and so far so good Trouble codes: P0102.
2002 Chevrolet Corvette Z06 5.7L LF Wheel Speed Sensor VIN: 1G1YY12S92
First I would like to thank everyone who replied. Sometimes it seems like when we are having trouble we end up checking the same things over and over. Your replies always give me insight as how to trounbleshoot the real problem. After checking ALL the wiring,...
2003 Chevrolet Express 2500 5.3L abs VIN: 1GCFH25T73
Well most of you guys hit the nail on the head. The vehicle had to be driven to turn off the light. I had driven it after the repair but only around the block. I don't think I got it up to required speed on the first road test. Thanks a lot guys.
2004 Chevrolet Colorado LS 3.5L wipers VIN: 1GCCS136X4
thank you very much for all of your help the customer came and picked up the vechile before i had a chance to fix it. thank you for all the people that sent replies
2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCHC24U95
We put new spark plugs -again- & flush injectors and it ran fine . Its been a week know and all is fine. Thanks all for help. Trouble codes: P0300 (misfire detected), P0455 (evap syst. leak large), P0496 (evap syst. flow during non purge).
2005 Chevrolet Malibu Maxx LS 3.5L cluster, radio, wipers VIN: 1G1ZT628X5
I could not duplicate the problem and released the car back to the customer. I re-checked the front wiring and grounds and all looked good. I disconnected and reconnected the BCM connectors. I called the customer after 2 weeks, and the problems have not return...
2002 GMC Sierra 1500 SL 4.3L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTEC14WX2
Thank you to everyone that replied. It turned out to be the right side catalytic converter. We removed the crossover pipe and placed it on the floor. We then put a water hose in the right side turned on the water but it barely flowed out the other end and over... Trouble codes: P0101, P0300.
2003 GMC Sierra 1500 SLE 5.3L MIL Lamp on VIN: 2GTEK19T13
I was able to fix this vehicle by replacing the throttle body unit again. Client has been driving this vehicle for 2 weeks now with no problem. Thanks for the help. Craig Trouble codes: P0220 (Throttle position sensor 2 circuit), P2135 (Throttle position sensor 1-2 correlation).
2006 GMC Sierra 2500 HD 6.6L Poor Fuel Economy
I just got off the phone with a rep from Banks pricing out one of their power systems for the Duramax. I told him of my drastic drop in fuel mileage and he said that it was the new low sulpher fuel. Guess we are going to burn way more fuel to go way less miles...
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