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Prev Professional Automotive Repair Technical Discussions for May 30, 2007
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Catera 3.0L control system VIN: W06VR52R5W
climate control seems to be in a default mode. will not switch modes (defrost, floor, vent), blows some from all vents, display shows switch occuring as requested. I took car to a friend with tech 2,pulled code 52 (not programed) did programing - tech 2 said s...
2003 Cadillac CTS 3.2L Hard Start VIN: 1G6DM57N53
This car came to me from another repair shop. They retrieved the code & replaced the Crankshaft Position Sensor. And the code came back.I checked their installation and tested the circuits. Looking into the CKP Sensor hole in the block (with a mirror), the rel... Trouble codes: P0336 (Crankshaft Position Sensor Performance)
1981 Chevrolet Corvette 5.7L Hydraulic system VIN: 1G1AY8760B
The problem first occured a little over a month ago. Customer states he started the car, backed out of his parking spot, maneuvered out of the parking lot and brakes felt normal. About 1/4 mile down the road, pedal went to the floor, and car came to a slow sto...
1987 Chevrolet P30 Step-Van 7.4L a/c system VIN: 1GBKP37W5H
HELP A/C ENGINEER NEEDED!! conversion motor home 134a after market system with expansion valve and york compressor. Vent temp. 60 deg. at best 80 deg. outside charged system from 1lb to 4.5 lb i have no specs. i cleaned evap., flushed system, fresh air door ...
1989 Chevrolet C1500 Cheyenne 5.7L Mechanical VIN: 2GCEC14K9K
hi techs: got this chev p/u that pulls hard to the left when braking. we removed all of the wheels and found the rear wheel cylinders and axle seals leaking. remove and replaced rear axle seals wheel cyls and rear shoes. also machined rear drums. test drove wi...
1995 Chevrolet Monte Carlo Z34 3.4L First gear VIN: 2G1WX12XXS
You guys have helped tremendously in the past, hope you can on this one . We had a 95 Monte Carlo with a bad DOHC 3.4. We also had what we thought was a 96 Monte with a bad body but a good 3.1. Nobody bothered to check the VIN, turned out it was a 97. Disc...
1999 Chevrolet Express 1500 4.3L No Start VIN: 1GCEG15W8Y
Hello all have this van giving us a hard time does not want to start when cold have good spark the fuel pressure is within spec when truck starts 55 to 60 but only about 55 to 45 when cranking it will start and stay running if we spray some carb cleaner in int...
2000 Chevrolet Tahoe LT 5.3L ac/compressor VIN: 1GNEK13T5Y
This vehicle came in with no a/c. I found the high pressure shut down sensor on the back of the compressor melted and burned. Before I go and replace the sensor any ideas on why it would melt. Thank you
2001 Chevrolet Impala LS 3.8L fuel gauge radio VIN: 2G1WH55K71
i have this impala here that the radio does not play at times and the customer also says fuel gauge not working and sometimes even the dash lights go out.i have seen the radio play and not play i also noticed that the fuel gauge will go to full and back down t...
2002 Chevrolet Silverado 2500 HD 8.1L Misfire, Poor Fuel Economy VIN: 1GCHK29G22
Hello all, This is a farm truck and is used HARD and pulling overloaded trailers.We stay on top of routine maintenance when the vehicle is available to come in to shop. This time it has multiple problems;customer complains of no power and bad running;down to 5... Trouble codes: P0218, P1683, P0300, U1041
2002 Chevrolet Impala 3.4L drl VIN: 2G1WF55E22
Hello-- this might be a good one for gm techs.This is my father in laws car and he tells me the drl lights turn off when putting the car into reverse. I have looked up tsbs and checked the wiring diagram but dont really see where this may be going. Is this may...
2003 Chevrolet Trailblazer LT 4.2L fan clutch VIN: 1GNES16S33
Have a 03 Trailblazer that intermittently clicks on startup. Sounds like it's coming from the fan clutch. Haven't exactly pinpointed the source yet though. Anyone have any experience with this noise, or knowledge of the electric fan clutches? Was thinking that...
1992 GMC C3500 Sierra 6.2L Cuts out VIN: 1GDGC34J2N
well thanks to all that response to this message well i am at lost with this bio diesel she run good but when you get on it it shuts down and she will restart after one or two crank well i cant find good info for this truck no codes fuel pump new fuel filtter ...
2000 GMC Jimmy Diamond Edition 4.3L Transfer Case VIN: 1GKDT13W1Y
The truck initially came in with the customer complaining that it felt like it was always in 4 Wheel even though the switch indicated 2 Wheel. Also it had shifted into 4 Low on its own. Scanned it with no codes. I put it on the hoist and all four wheels spin i...
1994 Oldsmobile 88 Royale 3.8L code 341
codes 341 intermitent cam signal, 342 no cam signal & 670 quad 4 failure. after replacing cam senor and magnet, icm, plugs,& wires, on interstate under load vehicle will misfire, cam and crank error on scanner goes from 1 to 19 to 49, check engine light and co...
1999 Pontiac Sunfire SE 2.2L tcc VIN: 1G2JB1240X
This car has no shift concerns, only a code P1870 intermittently. A test drive does not show anything unusual for a the TCC slip rpm. The vehicle won't re-pull a code during my test drive. I am not a GM trans guru, so I ask is there a known fix for this? I ha...
1999 Pontiac Bonneville SSE 3.8L MIL Lamp on VIN: 1G2HZ52K9X
Hi guys have a pontiac that sets a vent performance code.as soon as the customer takes it it sets.Last week we put in a new vent valve.313 miles later its back.I just ran the in bay service bay test and it passes.looking at the fail record its failed once and ... Trouble codes: P0446 (Evap Vent Performance)
2001 Pontiac Grand Am SE 2.4L trac off light VIN: 1G2NE52T51
This car has a trac off light that stays on constantly it has a c1275 code for PCM requested ETS disabled you can clear the code and it comes back immediately upon start up. I have done the diagnostic system check per mitchell and it passed this so I went thro...
2006 Pontiac Vibe 1.8L EPC Trouble code 2716 VIN: 5Y2SL67846
Vehicle came into shop with trouble code 2716- EPC solenoid circuit. Check connections at harness, checked resistance from computer through EPC windings. Removed and replaced EPC and internal harness with new. When road testing vehicle this code will take some...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick LeSabre Custom 3.8L No Start, Intermitent VIN: 1G4HP54C7K
thanks to all for the insightfull help! too many names to mention. the fix was the fuel pump. still have the check engine lite for est but it starts every time and runs rather well for a loaner. thanks again for everyones help. Trouble codes: 43 (ESC Problem).
2000 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR54K6Y
thanks for all the input, it was alittle low on charge that did help, but the left side temp door was not closing all the way , it has 2 little end fingers that wherechatching on the inside of the box , i was able to reah up and trim the edges of the fingers s...
2001 Buick Regal LS 3.8L control head VIN: 2G4WB55K81
thanks for the help, we removed the body computer and located the bcm body ground, which was green with corrision, we cleaned and greased it and went back and rechecked and cleaned all the grounds and our problem was fixed, the bcm ground and ac control ground...
1999 Chevrolet Blazer 4.3L RF wheel (ABS) VIN: 1GNDT13WXX
Well thanks for the responses everyone. Based on the average of the responses, the general feeling is that we should be using a O.E. or AC Delco bearing hub. Since the customer was leaning toward trading it off due to some other problems developing (such as co...
1999 Chevrolet Camaro 3.8L Misfire, MIL Lamp on VIN: 2G1FP22K7X
Sorry it took so long folks just real busy,...the fix wound up being a combination of a cracked/leaking EGR tube,..and a bad #6 coil.,...so far the vehicle has not returned,..Thanks again for all help. What a great tool this site is,.keep up the good work. T... Trouble codes: P0171 (fuel trim system lean bank 1), P0174 (fuel trim system lean bank 2), P0305 (cly 5 misfire).
2000 Chevrolet Cavalier 2.2L a/c clutch VIN: 1G1JC1246Y
Sorry been so busy, forgot to post fix. Problem was located in wiring from a/c switch to bcm. found out that it was a 2001 system not a 2000 system and the wiring diagram was slighty diffrent. thanks for everybodys help.
2001 Chevrolet Silverado 1500 5.3L power seats VIN: 2GCEK19T33
I only got five replies, but they had some good ideas. There is apparently a memory seat module that can be replaced, or the driver's door module that can be reprogrammed. I will need to consult the wiring diagrams, and a GM tech bulletin about this problem. t...
2002 Chevrolet Tahoe LS 5.3L compressor belt and tensioner VIN: 1GNEK13Z42
New compressor, orifice, and accumalator, flush lines
1997 GMC K1500 Sierra SL 5.0L master cylinder VIN: 2GTEK19MXV
Hi Thank you to everyone. I went out and made 10 panic stops in a dirt road down the street. Then bled the brakes and all seems to be Ok. I let the customer take the vehicle and told him to pay attetion to the pedal and call if anything felt unsure. It's get...
2001 GMC Sierra 1500 SL 4.8L Coolant VIN: 1GTEK19V91
Gentlemen this vehicle has been fixed. The response was terrific and provided the direction and information that was needed. As many suggested it was the water pump gaskets, we put 16 PSI on the system cold and let it sit, after about 30 minutes slight amount ...
2001 Saturn L300 3.0L odometer VIN: 1G8JW54R41
thanks for all the replies. i replaced the bcm and reprogram to tsb update. fixed. thanks for all the help.
2001 Saturn L200 2.2L compressor engagement VIN: 1G8JU52F11
first of all thanks to those who replied . Mithell on demand does not at any point have you check the BCM on this car and after running the flow charts they had me replace the PCM witch was a good part . I had a suspision the BCM was bad but i followed mitchel...
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