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Prev Professional Automotive Repair Technical Discussions for August 11, 2009
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille 4.6L engine VIN: 1G6KE54YOX
I've decided to look before i leap. i have customer that wants to replace the engine in his caddy, has been diagnosed, as the typical head gaskets, overheating on long highway trips, no coolant loss visible, been dye tested nothing leaking anywhere external. h...
2002 Cadillac DeVille 4.6L Poor Idle Quality VIN: 1G6KD54Y82
Car came in with a MIL on,won't idle-check codes P0106 MAF no problem found with MAF cleared the code and replaced the IAC alls good right,wrong next day customer calls car won't idle and MIL on - check codes P0506 low idle OK no problem call the parts store o... Trouble codes: P0506 (Idle speed low)
1997 Chevrolet C1500 Suburban 5.7L pressures VIN: 1GKFK16R1V
We installed new air lines and a new condensor. When we first tried it we added 2.25 lbs of 134a. compressor stayed running but wouldn't cool, pressures are identical hi and low around the low to mid 100's. Added more 134 1/4 at a time. no help either. Than i ...
1998 Chevrolet C3500 Cheyenne 7.4L No Start, Poor Idle Quality VIN: 1GCGC34JWE
All right here we go. This truck came in with a complaint of a hard start when hot. We check for codes and none were found. Fuel pressure was at 50 psi and it drops immediately with key off, we know the pump is bad but pretty sure this isnt whats causing the p...
2001 Chevrolet Silverado 3500 6.6L Hesitation, Surge, MIL Lamp on VIN: 1GCJK33191
Got a Duramax here that will, under a load, go into limp mode and set code Po093(fuel system large leak). Upon inspection, noticed that the oil in crankcase has quite a bit of fuel contamination. Also has about a 40 rpm "lope" at idle. Other than the limp mode... Trouble codes: P0093
2004 Chevrolet Suburban 1500 LS 5.3L Traction Control VIN: 1GNFK16Z24
Hey guys, I have a 4WD Suburban here that once in a GREAT while, the truck will act as though the Traction Control is activating. I have not been able to duplicate it, but my boss and his kid have. According to them, when you go to take off, it will not move,...
2005 GMC Yukon XL 1500 SLT 5.3L hard start at times VIN: 3GKFK16Z45
she came into me from another shop they said they could not find nothing wrong i found it started good for me but i checked fuel psi and found it was 60 psi but when you turn of key it drops to 10 psi it about 5 seconds i suspect a hole in the rubber hose at t...
2007 GMC Yukon XL 2500 SLE 6.0L Compressor VIN: 1GKGK26K57
AC compressor will not come on intermittently after cold start(although usually in 90 degree weather). No codes in system. When it happens,AC light on control flashes. Compressor loses signal from control unit then after about 3-5 minutes, starts working for t...
2003 Hummer H2 6.0L compessor VIN: X3H1211973
we installed a compressor, supplied by the owner (used car lot). there was no trash in the system. The buyer was in the other day with a noise that only happenen when the a/c is on and accelerating very fast. when the throttle is reliesed is when the noise wou...
2002 Oldsmobile Bravada 4.2L a/c system VIN: 1GHDT13S52
Owner returned within weeks and the A/C is still changing temperature at will. The redirection is not occurring, so that part was fixed, but the temperature will be reading the outside and blowing nice and cold when out of the blue it will start to read lower ...
2000 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB5249Y
This car came in with a MIL lamp on, and three current codes indicating faults pertaining to both O2 sensors. I checked under the "codes set since last cleared" and came up with a total of six O2 sensor codes. I monitored the O2 voltages with my Modis and Key ... Trouble codes: P0141 (O2 Heater fault)
2003 Pontiac Grand Am SE 3.4L signals, wipers, security VIN: 162NF52E53
Thanks for reading this. I have this car back for the second time! The first time the customer came in we had no wipers and intermitant signals. We replaced the muti-function switch and all was well. Now 10 months later we have the same intermitant problems wi...
1995 Saturn SL1 1.9L Surge, Cuts out, Stall, Misfire VIN: 1G8ZJ5486R
This is my personal vehicle . this has been a project for 2 days car starts and runs normal at idle hot or cold soak when driven it seems ok for sometimes 100 yds or it can be 2 miles then it starts misfiring kicking and bucking and may stall on deceleration ...
2000 Saturn LW2 3.0L Cooling Systems VIN: 1G8JW82R5Y
Just looking for a little input on this one. Engine coolant is leaking slowly but can be seen in the valley below upper intake. Unfortunatly the coolant does not leak with pressure test. I removed the upper intake manifold to see better. Now I can see coolant ...
2003 Saturn Vue 2.2L theft deterent VIN: 5GZCZ33DX3
We have diagnosed the problem to be a defective body control module. We have ordered a new module from Saturn and the module they supplied is not the same part number we have in the vehicle.The body control module in the vehicle is BCM# [...]. The module th...
2003 Saturn L300 3.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G8JW54R43
when this car came in,it was a no start.Checked codes none were found.No fuel pressure.All circuits good,replace fuel pump.Now I have good fuel pressure but,it sure doesnt run very good and there is no throttle response.reduced power light is on.and code p2101... Trouble codes: P2101, U1B07, U1B00

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Park Avenue 3.8L No Start VIN: 1G4CW5315N
Thanks for the help on this. Most said the problem was in the Passkey system. When I was looking at the Fix Database I was led astray by advice to someone else that said you could by-pass the pass key system by cutting the black wire and the dark blue with...
1989 Cadillac Allante 4.5L high idle VIN: 1G6VR3180K
Thank you to each of the 19 people who took the time out of their busy schedules to offer help. My co-worker has replaced the Idle Speed Control motor and performed the idle re-learn procedure. Happy to report that the unwanted high idle has disappeared. Th...
1985 Chevrolet S10 2.8L coolant/oil VIN: 1GC8S1489F
1990 Chevrolet R1500 Suburban Scottsdale 6.2L V gauge , fuel gauge, batt light VIN: 1GNER16C6L
All the dash issues have been resolved . in pokeing around with fuse links near the glow plug relay we developed some function with the volt gauge.However the fuse links and connections proved to be ok. further proding revieled an issue within the bulkhea...
1994 Chevrolet C3500 Cheyenne 7.4L melting plug wire VIN: 1GBKC34N7R
sorry for the late post.most of you were right the problem was it had no shields for the plug wires on the exhaust.however im still waiting for the customer to come in.thanx again
1997 Chevrolet Express 2500 5.7L No Start, VIN: 1GCGG25ROV
This van is fixed. I recieved 42 responses, many that seemed they didnt read the post. I really appreciate all who responded as a few led me in the correct decision to replace the fuel pump. It seems this style of injection systme is VERY sensitive to fuel pre...
1997 Chevrolet Blazer 4.3L ignition lock VIN: 1GNDTBW1V2
Jim and Jeff nailed this one. We found the sol. behind the lock cylinder intermittly sticking . Thanks again guys.
2003 Chevrolet Cavalier 2.2L Vent Solenoid VIN: 1G1JC12F43
Okay ... I got some good replies. I may not have described my situation in great enough detail. I had absolutely no issue with the wires going to the vent sol., or the sol. itself whatsoever. It was the ground exiting the ECM that was causing the greif (wit...
2004 Chevrolet Monte Carlo LS 3.4L Electronic VIN: 2G1WW12E54
Thanks to all who replied...What I finally found with this car was...On the right side temp actuator one of the pins ( blue wire ) was not making real good contact with the harness , the conector in the harness did not fit real tight...I replaced the harness c...
2006 Chevrolet Optra LS 2.0L Stall VIN: KL1JD69Z06
HEY GUYS, sorry for the late response... i want to thank duane from iowa for gettign me to check out the diagram for a cobalt to find the correct wiring for the pnp, and rob from michigan who narrowed me down to checking the pnp...we changed the PNP and all ... Trouble codes: P0705 (transmission range/low input).
2003 GMC Sierra 1500 5.3L Evaporator Housing VIN: 1GTEC14TO3
Well I'm going to say this one is fixed because I haven't really duplicated problem in the first place. I pulled carpet back and the insulation underneath was soaked. I tried running water over the wiper cowl and windshield per Bryan's reply, but didn't see ...
1995 Pontiac Trans Sport 3.8L alternator VIN: 1GMDU06L1S
After finally fiding out that the pcm was falsely calculating the alternators output voltage at 18 volts dc, I replaced the pcm and all is well. basically what was happening is that the pcm was turning the charging system on and off to control an overcharge co...
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