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Prev Professional Automotive Repair Technical Discussions for May 24, 2005
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Open Help Requests for GM
Help Request Answers
1990 Buick Riviera Luxury 3.8L compressor VIN: 1G4EZ13C91
Car came for AC service. All the AC components are good, but there is on signal or voltage at the compressor. When bypass the control circuit and direct 12 volt and ground applied to the compressor, the system is nice and cold. How can I retrieve the AC servic...
1983 Cadillac Seville 5.7L Poor Idle Quality VIN: 1G6AS698XE
Hello everyone, This vehicle came in about 2 weeks ago Running rough sold the customer a major tune up cap rotor wires and plugs compression tested good. The car left customer complaint about service engine light comes on when accelerating and goes off when th... Trouble codes: 52 (Power to ecm interupted)
1990 Cadillac DeVille 4.5L check engine VIN: 1G6CD5330L
i keep getting code e49 for air managment system failer had the same code 2 years ago. but this time when i do the flow charts every thing seems to be fine with the caddy on board diagnostics the computer switches things over like it soposed to i replace o2 se...
1980 Chevrolet Corvette 5.7L Wipers VIN: 1Z878AS412
Hi folks, I have a customer with a 1980 Corvette with a complaint of no wipers. My information system has nothing, they faxed us info that doesn't appear to deal with this system and then they sent us factory info for a 1982 Corvette with pages missing. In a...
1989 Chevrolet Corvette 5.7L No Start VIN: 1G1YY2187K
Car will start cold Wont restart after temp reaches 100f without starting fluid Scan tool reads VATS not ok have tested VATS system by trouble tree and replaced decoder module VATS trouble tree states 2.5 volts VATS book from GM says to check hertz We have 2.5...
1990 Chevrolet K3500 Cheyenne 7.4L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GCGK34N2L
Truck runs rough backfires through throttle body, runs very rich, block learn on scanner is 105 all the time on scanner, Runs better when warm although still seems rich, any help would be welcomed thank you in advance
1996 Chevrolet Tahoe 5.7L Misfire, MIL Lamp on VIN: IGNEC13R4T
HI Y'ALL ! We have this Tahoe with cylinder 5 misfire. I am posting this for friend at other shop. The customer brought it to him and wanted the heads repaired, #5 cylinder misfire. After testing compression and cylinder leakage, the #5 INJECTOR AND HOSE W/ PO... Trouble codes: P0305
1996 Chevrolet C1500 5.0L interchange VIN: 1GCEC14MTZ
I am working on a 1996 1/2T 2wd Chevy truck with a 305/4l60e The trans is slipping and I have access to a good 1998 model 4l60e that was behind a 350. The '96 is the regular 'ol SBC type trans with the sheet metal dust cover, and the '98 has a bolt on full cir...
1997 Chevrolet K2500 Cheyenne 6.5L Clutch VIN: 1GCGK24F0V
Vehicle came into shop for rear main seal replacement. Replaced clutch disc, pressure plate, pilot bearing, and clutch release bearing.After repair clutch would not disengage. Followed bleeding procedure as described in tsb# 01-07-31-002a. Checked and measured...
2001 Chevrolet Express 3500 5.7L Misfire VIN: 1GAHG39R11
I am posting this to ask if anyone has seen a large amount of corrosion inside these distributors. This van was in for a misfire and hard start complaint. I lifted the cap and found much green corrosion and moisture. The vent is clean except for the small amou... Trouble codes: P0300
2001 Chevrolet Silverado 1500 4.8L No Start
Hi to all.This chev is giving us a headache.Approximatly every 5 key cycles we get a crank/no go.Whats missing is spark.No codes logged and normal scan data except that when it acts up the crank rpm hits and stays at 12000.This didnt seem right to me so on wen...
2002 Chevrolet Avalanche 1500 5.3L Steering VIN: 3GNEK13T22
Vehicle has been to 4 other shops for complaint of steering wheel vibration side to side after hitting a bump when going straigh or through a corner all parts are good in the front end evo sensor has been replaced with no effect code po472 is set have not been...
2002 Chevrolet Monte Carlo SS 3.8L abs module VIN: 2G1WX15K02
customer stated the car started kicking abs light tracktion light on at 40k miles. we got the vehicle and saw the following codes c1222 rf wheel spd sensr input signal 0 c1226 rf wheel spd sensr variation c1233 rf wheel spd sensr ckt open or shorted what is ...
2002 Chevrolet Express 1500 5.7L Cuts out VIN: 1GBFG15R4Y
Hello ,thanks in advance.The van has no power while driving.I have made 1 road test that van dove great.If i give any gas to accel the injector pulse drops to 0.vehicle speed is correct.mass air seems ok.I have done complete tune up,cleaned maf and injectors.I... Trouble codes: P0171, P0174, P0300, P1870
1999 GMC GMC 454CID No Start VIN: 1GBJ7H1BXX
I need some info on how this fuel system works on this big truck. It has dual tanks, with a gauge sender & electric pump in each tank. The pump in the left tank is the one that feeds the engine, and I am guessing the smaller pump in the right tank simply trans...
1999 GMC Savana 1500 5.7L passlock VIN: 1GDFG15R2X
Hello, this is my first post for help. The van was a start and stall when towed in and i checked the basics. Checked for powertrain codes and found a P1626 enable signal not received (5.7 "C"&"K" SERIES MITCHELL no "G") and a U1192 loss of evo/vtd passlock com...
1993 Pontiac Grand Am SE 2.3L No Start, Misfire VIN: 1G2NE1A34P
This vehicle came in on hook. Customer explained that vehicle was on road at 35 mph and started to slow down, run rough and die. Customer tried to restart, ran very poor and died. When I started vehicle, started and ran like ign. timing was advanced then died....
1998 Pontiac Trans Sport Montana 3.4L power door VIN: 1GMDX03EXW
This van has a power sliding door that will not open or close automatically. I know there were a lot of problems with this setup on these vans but it has been a while since I have worked on one and I can't find the diagnostic info that I used to have on these ...
2005 Pontiac Vibe 1.8L abs VIN: SYSM63885Z
the first three or four stops after starting and driving the abs will activate. abs will work normally after this happens. i have checked the tone wheels and they look ok i have compaired the speed sensors whith the the tech2 while driving in a straight line a...
1995 Saturn SC1 1.9L No Start VIN: 1G8ZE1288S
vehicle almost starts, fuel pressure ok. spark ok, injector pulse present\using a noid light pulse is dim as injetors are unplugged brightness increases and vehicle almost starts. injector resistance ok. no corrosion in harness, ecm has recently been replaced
1998 Saturn badge_gone 1.9L Hesitation, Surge VIN: 1GBZG1278W
Hello to Saturn Techs, - This one is a bit out of our line, since we usually do Jaguars & Rovers. We have here a 1998 2-door Saturn, which bucks most annoyingly at part throttle, has reasonable power at higher throttle ranges, and which returns trouble codes P... Trouble codes: P0463 (1599 -), 1599 (1620 - learn fault), 1620 (learn fault), 1624 (tcm-ecm)
1999 Saturn SL2 1.9L fail smog VIN: 1G8ZJ5274X
Thanks in advance. this is my wifes car and it failed smog due to failing readiness status. it passed everything else. It failed on cat, evaporitive system, 0/2 sensor and egr system. It passed on secondary air system and heated o/2 system. it is not supported...
2001 Saturn SW2 1.9L Hesitation, Cuts out VIN: 1G8ZJ82721
This is a weird one. Even the dealer is stumped by this. When stepping on the accelerator, at light throttle the engine will stumble severely for a second and then will pick itself up and go like heck. It only acts up at about 10% throttle angle. even if you r...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL152M4
Thanks to all that tried to help me. This was a tricky one. Basically somewhere in this harness the fan 2 trigger wire shorted out to power. I don't know where because the wire dissapears into the firewall. What I did learn is that the fans have nothing to d... Trouble codes: P1652.
1994 GMC K3500 Sierra SL 6.5L Mechanical VIN: 1GTHK34F9R
thanks to all who sent ideas and helped out. customer decided to just install another oe flywheel and hope for the best. many good ideas such as aftermarket flywheels that are thicker and runout on the torque converter mounts. thanks to all and good luck
1997 GMC C1500 Sierra GT 5.7L Misfire VIN: 1GTEC14R3V
The fix turned out to be a couple of things. It had an exhaust leak @ the rt manifold to pipe gasket. Both O2 sensors for bank 2 were non responsive. After these items were fixed & all the O2 sensors were replaced the truck ran great. The owner told me today t...
1999 Oldsmobile Alero GLS 3.4L Misfire VIN: 1G3NF52E6X
Well I tested the alcohol content of the fuel the customer is using and found it is at 6%. We advised her to try getting her fuel at a different station even though the fuel was nice and clear and to stay away from ethynol fuels. We did not clean the injectors... Trouble codes: P0304 (Cyl 4 misfire detected).
1996 Pontiac Firebird Formula 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2G2FV22P0T
well the nightmare is gone! we did replace all of the valve springs, but that did not fix it, and the miss changed cyl. so i checked the new cyl, and the inj had gone bad, replaced injector, still had miss, turns out it was a bad fuel preasure reg. Thanks to a... Trouble codes: P0300 (Misfire).
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