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Prev Professional Automotive Repair Technical Discussions for July 6, 2006
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L flickering check engine light VIN: 3G5DA03E12
car has a flickering check engine light w/code b2552. once cleared, comes back when put in gear. Has other codes related to other interior modules occasionally.
2003 Buick Park Avenue 3.8L magna steer VIN: 1G4CW54K53
customer is not pleased with effort it takes to turn wheel at higher speeds.i believe this system is working just like it was designed. my question is can someone with a tech 2 scanner change the amount of resistance that this system applies. any help will be ...
1970 Cadillac Sedan DeVill 472CID air flow
I have looked at this big Caddy this morning, I don't have info for vehicles this old. WHat the car is doing is all A/C components working fine, I believe the doors are working but there is no airflow on the inside of the car. the fan is operating normally, bu...
1987 Chevrolet P30 Step-Van 6.2L Poor Fuel Economy, LACK OF POWER VIN: 1GCJP32J4H
This is an ex-postal vehicle that I purchased several years ago and have just now gotten around to using. The vehicle had its motor and trans replaced prior to our purchase. I doubt if it ever was driven above 55mph for any extended period in its entire life p...
1989 Chevrolet G20 Chevy Van 5.7L Poor Idle Quality, Stall VIN: 1GBEG25K7K
This vehicle is running with a poor idle when it idles. It runs a lot better when I remove the vacuum off the MAP sensor. Also I see the fuel streaming not spraying out the injectors. But why would this vehicle idle better with the MAP sensor vacuum unplugged....
1993 Chevrolet Lumina APV 3.8L Excessive Emissions, Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GNDU06L3P
Please help! Been up close and personal with the van for 4 evenings now. According to the owner car started surging at idle when parked with engine running at a corner store a week ago. Misses and hesitates when accelerates. At times van would start and run s... Trouble codes: 23 (MAT- Manifold Air Temperature sensor), 99 (Power management problem), 66 (A/C switch)
1994 Chevrolet S10 Blazer Tahoe 4.3L Hard Cold Start VIN: 1GNDT13W7R
The truck has a hard time starting cold & warm if it was sitting for over 30 minutes. If you shut it off and try to restart it is fine. ANd once it gets going it runs perfect. I recently had problems with a bad rebuilt CPI unit, so i installed a new GM unit se...
1998 Chevrolet S10 2.2L brake lights VIN: 1GCC51948W
hey guys, got an old work truck from a client that will blow the brake light and four way fuse right away. you can install the fuse and it will be fine untill you press on the brake pedal or push in the four way button, then the fuse blows. turn signals work n...
1998 Chevrolet C1500 Suburban 5.7L fuel gauge VIN: 3GNEC16R8W
this fuel gauge appears to buzz or vibrate rapidly sometime needle jumps abit-thanks for any help -i hope this is a common problem
2001 Chevrolet Cavalier 2.2L engine VIN: 1G1JC52471
This one is killing me. Originally came in overheating, loss of coolant. I found no leaks, it appeared thermostat was not opening causing a no-flow condition. Replaced thermostat, refill per GM, road test ok Came back, same complaint. I diagnosed as air trapp...
1999 GMC Sierra 1500 SL 4.3L Alt VIN: 1GTEC14W7X
Brown wire comes from VCM and wire is ok.I can make alt charge if i use test light from B+ to L terminal.Serial data from instrument panel to VCM should turn it on ?? How can I tell if I have serial data to VCM. No voltage reading there with key on
1997 Oldsmobile Cutlass Supreme SL 3.1L Misfire, MIL Lamp on VIN: 1G3WH52MXV
Misfire is on #3 cylinder and is not a dead misfire. #6 cylinder has no misfire and is on the same coil. I can switch plugs, wires and coils and misfire stays on #3 cylinder. I have lab scope ignition system and injectors. I cannot see any fault in patterns. I... Trouble codes: P300
1997 Pontiac Grand Prix GT 3.8L overheats VIN: 1G2WP52K5V
Saw vehicle for first time last week. Customer has owned for a couple of months. Complaint was overheating/fan(s)inop. Pulled in after test drive with all normal readings on temp. guage. Let run till up to temp. At 2 bars over 210 degrees, only the passenger s...
2000 Pontiac Grand Prix GTP 3.8L Compressor VIN: 1G2WR5213Y
Compressor will shut off while driving and may or may not come back on in a timely manner. I experienced this on the first test drive, believe it or not, and straight back to shop. I am not getting ground signal on green/white wire from PCM to Compressor relay...
1997 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5279V
I don`t work on these cars,but any help would be great.It keeps flagging a p0401 whicjh is something with the EGR valve it is new and I cleaned what appeared to be the passage.what am I missing? thanks...Jason Trouble codes: P0401
2000 Saturn LW2 3.0L Reduced power VIN: 1G8JW82R9Y
Customer states reduced power light and SES light comes on, have not duplicated concern. Soldered new connecters, checked terminal ends, and cleared codes but came back with same problem. Checked throttle position activity with scan tool and found both TP sens... Trouble codes: P1526 (Min. throttle position not learned), P0121 (TP sensor 1 circuit performance), P0221 (TP sensor 2 circuit perfomance)

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Park Avenue 3.8L cruise control VIN: 1G4CW53L4N
First,I want to thank everyone that replied. I used the information to trace this system down. What I ended up doing was teeing in a vacuum gauge at the servo and running a gauge to the driver seat, then I back probed the wires for apply and hold and ran jumpe...
1965 Cadillac fleeetwood 472CID wiring/control unit
Thank you again for all the help!!! We bypassed the servo and fed vacuum to the switch on top of the heater case to make the a.c work. the customer was happy with this 'fix' I know the servo vacuum switch is bad. This is a summer only car so as long as his a.c...
1995 Chevrolet K2500 Cheyenne 7.4L Poor Idle Quality, Stall VIN: 1GCGK24N9S
Good afternoon Finally had a chance to work on this beast again, installed a recycled distributor per customer request, instead of a new delco unit. the old distributor bushings were shot as was the magnet, I think I replied to each one that tried to help, t...
1998 Chevrolet S10 LS 4.3L engine VIN: 1GCDT19X4W
After much discussion with numerous salvage yards and the local Chevy dealer who used the vin to come up with some differences between the 2 engines that I wasn't comfortable trying the swap. I did manage to find a fairly nice 4.3X engine of same year and will...
1999 GMC Savana 2500 5.0L Hesitation VIN: 1GTFG25M9X
I would like to thank all of you people out there in IATN land who took the time to read and reply to me. The fix ended up being the MAF like a few of you suggested. It was a very intermetted problem and I was not able to watch it on the scan tool or capture i...
2000 GMC Sonoma SL 4.3L starter VIN: 1GTDT19W1Y
Hey guys I waited to post this to make sure this thing was fixed.Jeff and Robert were right on the money in that it was the trans safty switch causing the problem.In my case the shift selector seal was leaking trans fluid into the switch(The switch on these tr...
1989 Oldsmobile Cutlass Ciera 3.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 2G3AJ51N4K
I replaced all 6 injectors with a matched set and the cold drivability problem went away and the block learn came back down to normal when warmed up. Thanks to all who responded John [...]
2002 Saturn Vue 3.0L No Start, MIL Lamp on VIN: 5GZCZ63B22
Sorry that it took so Long. But it turned out to be a bad Ecm. It was under warranty, and the dealer ship put un a new one. Thanks for all the replies. God bless You all. Trouble codes: P0206.
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