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Prev Professional Automotive Repair Technical Discussions for October 5, 2007
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Open Help Requests for GM
Help Request Answers
1990 Buick Reatta 3.8L Brake Pedal, ABS Light VIN: 1G4EC13C6L
Hey guys, Need help again. I am into an antilock brake system I don't know much about. At an idle, when I push the brake pedal, the pedal falls further than normal and the ABS system "grunts" (like the ABS is kicking in.) The brake light and the ABS light are ...
1995 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52L7S
Hey all Thanks for looking. Got this clean low mile never wrecked buick in from another shop. Sets p0321 as soon as engine is started. Somedata gives a simple trouble tree of test pin rb6 at pcm. Should read 5v koeo and 2.5 koer which it does. Results bad pcm... Trouble codes: P0321 (IC circut)
1997 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52KOV
The car came in for a waterpump. I put on the water pump and a new belt. Went to drive the car and the car felt like a missfire above idle. The RPM between 1100 to 1400 is when it is felt. There are no codes or missfire on the counter. The vibrations can be fe...
1999 Buick Century Custom 3.1L Poor Idle Quality, Cuts out, Stall VIN: 2G4WS52M5X
We have this 99 Buick Century. Customer states that the car runs rough at idle on start up, especially when starting the car after a fill-up. Code P1441 is set, purge flow during non-purge. We replaced the purge valve thinking this was faulty, but the code and... Trouble codes: P1441 (Purge flow during non purge)
2005 Buick Park Avenue 3.8L Left Blend motor VIN: 1G4CW54K85
This car came in today and is blowing only cold air from left side vents. I replaced left blend motor and IPM module in June and it worked fine. I found out that the blend motor was replaced the year before by dealer and that they would not warranty it because...
1991 Cadillac Eldorado 4.9L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1G6EL138B5
Car towed in as a no start. Severely flooded. Plugs fouled, gas in oil. No data available on scanner, not sure why. Checked for codes in climate control on board system & got code for shorted map. Replaced plugs, map & changed oil. Car started right up. Runs g...
1991 Chevrolet S10 2.8L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GCCS14R5M
Posting for another shop so I don't have all of the data available. Runs rich at idle with 14" of vacuum. Engine temp was 150, replaced thermostat. Still rich. Smoked the engine block and got smoke out of the throttle body. Replaced the intake manifold gaskets...
1996 Chevrolet Caprice Classic 5.7L p0161 VIN: 1G1BL52P3T
Hello everyone and thanks for the help on this one. I have this 96 Impala SS that is in for the light on with a P0161 stored for oxygen sensor heater circuit failure. Where i am confused is this. Alldata is not clear on which of the 4 sensor has the faulty cir... Trouble codes: P0161 (Oxygen sensor heater circuit failure.)
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3W
Vehicle is an interminent no start, usually when cold(40-50f). The fuel pump is operating. I have no codes and spark is present. When hooking up a test light there is no injector pulse. The engine will start and die imediatly. No codes and the security light i...
1998 Chevrolet C2500 Cheyenne 5.7L No Comunication VIN: 1GBGC24R3W
Truck came to us with Reject sticker. Failed Massachusetts state inspection. Reason: The machine was not able to comunicate with PCM. We check it out and are able to comunicate fine with our Tech2. The customer brought it to 2 diferent places and we tried the ...
2000 Chevrolet Tracker 2.0L motor VIN: 2CNBJ13C1Y
This unit has a bad vibration only at idle, gets worse when in drive with foot on the brake. It actually shakes the vehicle. Goes away instantly above idle. I did not find anything broken, pryed on all the motor and tranny mounts... balancer looks to be intact...
2000 Chevrolet Monte Carlo SS 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 2G1WX12K2Y
Hey all, Guess it's my week for headaches. When this car came in it had a code B1000 which according to Alldata is a BCM fault, we replaced the BCM and it ran fine for about 5 minutes then started doing the same thing again (running horribly, check engine ligh... Trouble codes: U1000 (Loss of class 2 serial communication)
2001 Chevrolet Silverado 1500 HD LS 6.0L Hesitation, Surge, Stall, MIL Lamp on VIN: 1GCGK13U91
This truck came in with the complaint of stalling and power loss. the check engine light had come on. We scanned the computer and had a code p0300 in memory. Freeze frame data showed the ST fuel trim bnk 1 at -35% LT at -14%, bnk 2St 3% and LT at 0%. bnk 1 pw ... Trouble codes: P0300
2002 Chevrolet Venture LS 3.4L Hesitation, Stall, Misfire VIN: 1GNDX03E02
This truck is from a local scrap yard. They swapped the engine with the same year and size (3.4). This engine has 33,000 miles and has great performance with 02 staying at 900mv at WOT. This is a trusted scrap yard. At times when accelerating from a dead stop ...
2002 Chevrolet Express 3500 5.7L No Start VIN: 1GBHG31R92
im stumped on this one fellas this express van has got only 5 volts to the fuel pump. not the pressure sensor the fuel pump if i jump 12volts to the pump the pump works (can hear it humming) ive called around and everyone says that i should have battery voltag...
2004 Chevrolet Impala LS 3.8L ps pump VIN: 2G1WH55K74
this customer came to my shop with a power steering pimp sounds like the system is air bound.the car had a pump put in it because the original one had failed.she went back to original repair shop who installed pump to complain about the noise.they ins...
2005 Chevrolet Express 1500 LS 4.3L Hesitation, Surge, MIL Lamp on VIN: 1GCFG15X85
van came in with po102 - maf sensor/ circuit problem. replace the maf sensor and air hose, still did the same thing. check for vacuum leak with smoke machine and none were found. replace the maf sensor again and program pcm, acted the same thing. replace pigta... Trouble codes: P0102
1998 GMC Safari SL 4.3L Hesitation, Surge, Cuts out, Misfire VIN: 1GDDM19W7W
1986 Pontiac Fiero GT 2.8L discharge line VIN: 1G2PG9793G
I have Fiero here with a leak in the aluminum discharge line that runs under the body from front to rear. I was wondering if anybody knew of any aluminum line repairs other than welding that would fix this line. (I can get a brass compression fitting, but I do...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Eldorado ESC 4.6L MIL Lamp on, theft warning VIN: 1G6EL12Y4W
Pcm I knew power and grounds were ok at the dlc and that there was data. Decided to send vehicle to a local shop with the ability to reprogram modals. Thought maybe the low voltage from the defective alternator had wiped out the programming they condemned th...
2004 Cadillac CTS 3.6L Anti-theft VIN: 1G6DM57784
Sorry for the late reply. We checked, double and triple checked everything that was suggested in your replies. Keys were original (PK3) keys. Transponder ring was clean, connectors were good. Checked ground cable etc. Everything looked good. After severa...
2003 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, low power light on VIN: 3GNEC16T33
I didn't really get a lot of help on this one, but one said to check powers and grounds. He was on the money. I found out after I posted this that it has had an engine put in it just before all of this began. Ah Ha! I began looking on the back of the block... Trouble codes: P1518 (Throttle actuator control).
2006 GMC Sierra 3500 SL 6.6L shifting
cleaned grounds and repluggedin connector to transfer case and ebcm. shudder is caused by axle wrap up from lift and soft springs. waiting for traction bars to fix that. thanks for your replies. Trouble codes: 0562 (cruise control), 0827 (tap up down switch), U1041.
1997 Pontiac Grand Am SE 3.1L starts and stalls
Well thanks to all the replies I think I tried every suggestion at least once... I found out that these vehicles have a problem with losing or having intermittant ground problems there is a ground wire on the bell housing towards the front of the car and also ...
2002 Pontiac Montana 3.4L rear brake light VIN: 1GMDXO3EX2
The concensus of the replies was the whole rear assembl needsed o be relplaced.This was done & the light has not failed since.
2006 Pontiac G6 3.5L starter VIN: 1G2ZG55886
Hello everyone and thanks for the help on this one. I recieved numerous replies about this one and many stated that igntion switches were problematic with these cars. Our ignition switch tested ok. What we found was that when it would act up, if we moved th...
2000 Saturn SC2 1.9L MIL Lamp on VIN: 1G82Y1271Y
the passage wre stopped up in the head some time it helps to talk to the custmer your self come to find out he just bought the car i found out it had a junk yard motor in it thanks for the help Trouble codes: 410 (sec air).
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