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Prev Professional Automotive Repair Technical Discussions for February 4, 2006
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Open Help Requests for GM
Help Request Answers
1990 Cadillac DeVille 4.5L Excessive Emissions VIN: 1G6CD5330L
The complaint on this vehicle was high exaust smell in garage on warm up. Found car running very rich at all times. Found o2 sensor no voltage and badly fouled, replaced o2 sensor. Now o2 reading is around 800mv at all times, closed loop. Lab scope shows stead...
1993 Cadillac Seville STS 4.6L Poor Idle Quality VIN: 1G6KY5299P
this vehicle came into the shop running poorly. after removing the upper intake manifold cover, i found the map sensor and the fuel pressure regulator not to have vacuum lines. this vehicle has a sealed intake. are the map sensor and the fuel pressure regulato...
1995 Chevrolet Monte Carlo LS 3.1L no-crank VIN: 2G1WW12M8S
Hello! This vehicle does not crank over! No power to purple wire @ starter! Checked power @ ignition switch, nuetral safety switch ect. = ok. It appears that anti-theft relay yel/blk wire is not being grounded by the theft module! I have 12 volts on that wire ...
1997 Chevrolet Venture 3.4L fuel pump cooling fans VIN: IGNDU06E4V
Fuel pump and or cooling fans will start up at times when vehicle is shut off and they will run until battery goes dead. Checked power and grounds at computer ok When you pull relays out of fuse block they shut off.
1998 Chevrolet S10 LS 4.3L transfer case VIN: 1GCCT19W1W
Gentlemen We have this pickup in with a no shift out of four wheel drive problem. It was in a couple of weeks ago for the same problem. At that time the front axles would not disengage from the diff. This was traced to a bad vacumm switch holding the diaphram...
1999 Oldsmobile Alero GL 3.4L Cooling Fans VIN: 1G3NL12E3X
Help I have checked and changed coolant sensor,checked 5V ref. and ground. Have reflased PCM and still fans inop. I can comand on with scan tool on low or hi wich should mean relays and wiring ok,if i unhook sensor fans run but gauge drops to cold it does not ...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Surge, Misfire VIN: 1G2WK52J02
This car has been in the shop for a week now. Customer picked up car Friday 3, and brought it back again(Apparently needed car for a minute) Other post was closed with no fix. We have put new plugs, wires, coil packs, ignition module, crank sensor, mass airflo...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Electra Park Avenue 3.8L Noise VIN: 1G4CW51C3J
Sorry it took so long but we had to wait for some rainy weather. It was the exhaust warping at least 3 inches to contact the floor board. Fix was we welded several braces on the pipe between the bends. I would not have believed it if it had not happened to me....
1991 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Dies at idle VIN: 1GBDM19Z1M
I forgot to mention I did check the the EGR & the diaphram would not hold vaccum & would not even activate. The customer opted to put in the EGR valve with no change . He did not want to get into the fuel pump/filter due to excessive rusting of fuel lines & wo... Trouble codes: 33 (map sensor history code).
1991 Chevrolet Caprice Classic 5.0L Stero Amp VIN: 1G1BN53ESM
I should've mentioned that the feedbeck noise is there KOEO to rule out any charging system problems. The problem was in the Bose amp. mentioned some green capactors in the amp (part#1615513) that will fix 95% of the problems these amps have...
1993 Chevrolet C1500 Cheyenne 5.7L fuel pump VIN: 1GCDC14K4P
I replaced the oil sending unit, and have had good results. Thanks to all who replied, this is a great resource to fall back on.Sincerely Gabriel [...].
2006 Chevrolet Silverado 1500 LT 6.0L transfer/driveline VIN: 2GCEK13N46
Thanks to all who replied, but I am unable to resolve this issue. I received 2 requests for the bulletin I acquired, one suggestion that it was simply an exhaust noise, one comment that someone has the same problem that an engine swap did not fix, and a sugges...
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