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Prev Professional Automotive Repair Technical Discussions for January 17, 2008
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Open Help Requests for GM
Help Request Answers
1993 Buick Park Avenue Ultra 3.8L No Start VIN: 1G4CU5315P
This one was towed in for a crank, no start. It HAD been at TWO other shops before it landed here. Other shop had replaced the harmonic balancer and crank position sensor to no avail - then vehicle towed in here. Preliminary testing resulted in recommendatio...
2001 Buick LeSabre Limited 3.8L ABS Module VIN: 1G4HR54K71
This problem started back in Nov of 07. (11-8-07) I have a 2001 Buick Lesabre Limited, 3.8l vin \"K\". It has been setting ABS codes, most recently C1228. It originally set C1227 and C1228. These were cleared and redriven. After a period of time the light came...
2004 Buick Rainier CXL 4.2L all electrical VIN: 5GAET13P24
Vehicle towed in with no start. Battery tested .76v, vehicle had been driven the day before with no problems. Installed new battery and tested for parasitic draw. Tests OK, powers down to .011a draw after 15 minutes and holds. Previous shops replaced battery 3...
1996 Chevrolet K3500 5.7L Lighting VIN: 1GBHC34RXT
I have a 96 k 3500 with park lights and dash lights that completely inoperative. I have probed the pigtail and all fuses; all of the fuses are good. I am at a loss on where to go from here. Any advice would be appreciated.
1998 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WOW
Vehicle came in running with misfire at idle, code P0300: Random cylinder misfire, misfire counters in thousands for cylinders #1, 3, 5 and fuel trim negative for bank #1. Scope pattern acceptable. Fuel pressure within specs. Nothing obvious with scanner data,... Trouble codes: P0300 (Random cylinder misfire)
2001 Chevrolet Silverado 2500 HD LS 6.0L n/a VIN: 1GCHK23U41
This truck flashes the check eng lite over 100 kph. Puts code P0300 random misfire. I have swapped plugs, coil and fuel injectors with no change. I have monitored misfire with snapon scanner and I have got it down to cyl#1 and cyl#6 to be the cause of the lite...
2001 Chevrolet Astro 4.3L fuel spews out from VIN: 1GCDM19W41
hello and thanks to all in advance. customer has a 2001 astro van, he has gone to fill up fuel tank, fuel blows back from neck after .50 cents, fill neck is venting off vapor when you first remove cap, i had to remove fuel hose from neck to tank and push in an...
2002 Chevrolet S10 LS 4.3L high beams VIN: 1GCDT13W02
this truck came in with no drivers side high beam. the bulb is good, the daytime running lights are good, the passenger high beam is fine, and low beams are both fine. i just had a 2000 s10 that came in with no head lights. i was just wondering if there was a ...
2002 Chevrolet Avalanche 1500 5.3L fuel pressure VIN: 3GNEK13T92
i have a noise at the fuel regulator like a womp,womp,sound on ocassion every 30 sec or so at idle . i put on a new fuel regulator and a fuel filter on it ,still have the noise. dont get the noise when regulator unplug. fuel pump amps are 9 to 10 amps ,good fl...
2002 Chevrolet Trailblazer LS 4.2L Cuts out, Stall, MIL Lamp on VIN: 1GNDT13S82
This vehicle acts up very intermittently. Initially, the customer told me the vehicle bucked with the security, ABS and MIL & low power lights coming on. It kept running and he was able to drive it to our shop. I retrieved codes P1635 - 5 Volt reference 'A' lo... Trouble codes: P1271 (APP Sensor Correlation Error), P1635 (5 Volt Reference A Low), P1639 (5 Volt Reference B Low)
2003 Chevrolet Tahoe LT 5.3L Electronic VIN: 1GNEK13Z23
This vehicle came in with a current U1026 Serial data communication problem with tccm. I visually checked all connectors that are four wheel drive related. The buttons on the dash ligth up but the amber indicator is not visible. I checked the fuses and the tcc...
2003 GMC Savana 3500 6.0L Engine idle VIN: 1GDHG31U03
Brought back in with complaints of high idle again, 2500-3000 RPM with no pressure to gas pedal. Vehicle does have throttle cable and when diagnosed with scanner there were no codes present.Please advise if anyone has had any related issues with similar vehicl...
2004 GMC Sierra 3500 6.6L Won't shift VIN: 1GCJK332X4
Need some help with this one guy's.Truck came in from a used car dealership. Truck won't shift and check engine light is on. Pulled codes and the following were set. PO700, PO713, PO748, PO763.tried to clear codes but they would not clear. We don't get alot of...
1996 Oldsmobile Aurora 4.0L power seats, mirrors, a/c, instument panel VIN: 1G3GR62C1T
Our body man replaced the driver's door on this Olds, now whenever you toggle the seat switches or the mirror switches, the seat memory module clickety-clacks. Fuses all seem good, powers and grounds all seem good, G200 at the kick panel is good, and so are th...
2001 Oldsmobile Aurora 4.0L Engine oil leak VIN: 1G3GS64C81
I have this 2001 Olds Aurora with the 4.0 engine with a massive oil leak from somewhere around the rear of the engine, oil pan gasket area where the transmission overlaps the engine from the bottom. I can see the flex plate and it looks dry. I suspect the pan ...
2000 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NV52E3Y
hello techs. thanks in advance for any advice.have problem with roll no start. vehicle is flooding.ect temp reads 34,have no codes.fuel psi is high 70 cranking,good spark,inj pulse width reads 130 cranking.have not seen problem like this.any help would be appr...
2005 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL63885
Cleaned the MAF 9 months ago for lean code. Car came back in December, replaced MAF then, car is back today. I am thinking O2 sensor, any other ideas? Can't find any obvious vacuum/intake gasket leaks. I searched in the Toyota Matrix section also. The freeze f... Trouble codes: P0171 (System too lean)
2003 Saturn Vue 2.2L Elec power assist VIN: 5GZCZ23D93
started out when you start car after sitting for a while it would not have power assist and then after a min or two it would start working and work fine until you park car again.Talked to saturn parts guy he said ck for power & Ground to column and if it was g...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L speedometer and trans VIN: 1G4GD2214S
After all comments I began to riple check everything I had done, including checking the reluctor wheel for movement or even missing teeth, signal out of the vss was good and seemed to be good at the computer but had nothing on the modis. I chose to check into...
1999 Cadillac Seville STS 4.6L Radio, Electric Windows, Power Locks, ETc VIN: 1G6KY5497X
Thanks to all the great replies. The car sat around for 2 weeks before the customer picked it up. It's going to be traded in so i'll never know what the cause of these electrical gremelins were. iatn rocks.
1996 Chevrolet Tahoe LS 5.7L crank no start VIN: 1GNEK13R3T
thanks guys. i fixed it. chris from ontario advice did the trick. the plugs were fuel soaked. i removed the plugs, squirt some oil ,waited 10 minutes. with fuel pump fuse out,crank for 5 seconds.reinstall plugs, crank and fired up after a few trys. thanks aga...
1996 Chevrolet Cavalier Z24 2.4L No Start, Stall VIN: 3G1JF12T0T
I checked the oil pressure again as some of you suggested and I had to drive it for a bit but it did finally spike to 150psi. I replaced the oil pump and all is well, Thanks to all of the replies.
1998 Chevrolet Malibu 2.4L Water outlet VIN: 1G1ND52T7W
I have had 19 responses in less than 24 hours and overwhelmingly they say to flush the system and refill with the Green anti-freeze. Most of you thought that it was electrolisis set up in the cooling system but the issue I have with that is this is a plastic ...
1999 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R4X
After talking to a friend who is a tech for a local chevy dealer, i decided to go with relearning VTD password via a TECH-2 scanner. this turned the security light off, ending the problem. my friend could not explain why conventional relearn methods did not w... Trouble codes: P1631 (theft system - password incorrect), P0463 (fuel level sensor circuit high or open).
2002 Chevrolet Silverado 1500 4.3L not known VIN: 1GCEC14W62
Well this one is fixed. Thank God! I got 53 replies on this one and most where good leads and sugestions. We followed all the good sugestions from, lifter noise to flywheel cracks, Some even mentioned crankshaft end play.with no luck. We did the Bore scope rou...
2004 Chevrolet Trailblazer LS 4.2L 2 Mon. not ready VIN: 1GNDT13S54
This vehicle is fixed ! Many thanks to Lonnie,Cornelius,Steven,Wayne,Michael,and Ray for their prompt responses. There were no other problems with the truck other than the outside temps. I mounted two potentiometers on a plastic box and ran 4 wires out to engi...
2001 GMC Sierra 2500 HD SL 6.6L Water pump VIN: 1GTHK23141
I found with t stats out it would flow fine no heat to be expected, but could see bubles in line I know the three time i bleed the system and retested the air was out to start. So it is an air lock at the tstat coused by comression lose into cylinder. Custom...
2001 Oldsmobile Aurora 3.5L Cuts out VIN: 1G3GR62H01
One response was to shoot water at the crank sensor area & see if problem acts up. And it did . Due to the fact you cannot see the crank sensor or wiring with the starter in , we removed the starter & found the connector wiring was laying against the exhaust ...
2000 Pontiac Grand Am SE 3.4L hydrolic unit, modual
well the vehicle finally acted up in the shop, as per suggestions I checked charging system and powers and ground circuits at the ABS modual, I found the relay control circuit was fluctuating from 10 to 12v switching the relay on and off (continuosly doing a s...
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