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Prev Professional Automotive Repair Technical Discussions for September 22, 2008
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Open Help Requests for GM
Help Request Answers
1987 Buick Regal GNX 3.8L Poor Idle Quality, Hesitation, Misfire VIN: 1G4GJ1172H
have a condition that when this car is hot at idle and when accelerated it stumbles then takes off then runs smooth until accelerated again needs some help is it possible that my cam sensor is bad all checks come up good
1989 Buick Reatta 3.8L temp gauge
temp gauge climbs slowly to 214 then fans come on low speed about 3-4 seconds later fans go to high speed temp gauge jumps to 235-240 right then and fans never shut off,radiator/w pump/thermostat replaced before i received vehicle,check cts wiring gauge respon...
1992 Buick Regal 3.8L overdrive VIN: 2GAWF14L1N
Thanks in advance for any ideas. I have this regal that I inherited and am trying to sell. If the selector is in overdrive the car seems to go into neutral when stopping and turning. If shifter is in regular drive this problem doesn't occur. The car doesn't di...
1996 Buick Century Custom 3.1L Hesitation, Cuts out, Stall VIN: 1G4AG55MOT
This one came in with the complaint of stalling. Checked plugs, coils, fuel pressure, tps,map,replaced fuel pump only had 25 psi. Got it up to 35-40! drove fine two days it back. This time took a ride with customer and found out what was realy happing! This ca...
1999 Buick Century Custom 3.1L low beams VIN: 2G4WS52M8X
low beams do not work tried new bulbs checked all fuses # 36 doe blow but after replacing it they still do not work has battery voltage to both terminals replaced daytime running lamp module
1992 Cadillac DeVille 4.9L fuel data center. climate control VIN: 1G6CD53B4N
hey guys! . i need some help on a 92 deville. neither the fuel data center. or the electronic climate control is illuminated. . i have repaired them with dashes or a "D" in the screens. but never one that was blank. all of my powers and grounds are good except...
2001 Cadillac DeVille 4.6L mode door actuator VIN: 1G6KD54Y01
Help!!! This cad came in for a clicking in the dash and no air from vents. Tech 2 shows code BO249. Checked it out, bad mode actuator. Heres where it gets bad, I tried to replace it without removing the dash. Upon removal of the cam assy and actuator some how ...
1994 Chevrolet Camaro 3.4L fuel gauge inop VIN: 2G1FP2252R
Hey guys, This vehicle has an erratic and at times non working fuel gauge. Diagnosed it as a sender. I don't work on these older cars that often any more, but I do remember something about the fuel tank being very hard to get out of these cars. Are these the c...
1994 Chevrolet Lumina APV 3.8L speedo VIN: 1GNDUO6L7R
vehicle came in to our shop with the complaint of speedo inop and not shifting, sometimes. Found output speed sensor replace previous by another shop. Checked out found output speedsensor code. When i checked it on the lift, i did not get a signal at the wirin...
1994 Chevrolet S10 4.3L clutch VIN: 9876567891
Hi guys, i have this customers 94 s-10 pickup. Clutch appears to have gone this morning. You can not push the pedal in. Has anyone ever changed the clutch in the 4x4. The maunals say its easier to pull the motor? If not, anyonehave an extimate on the time to...
1994 Chevrolet S10 4.3L No Start, ecm, no communicatio VIN: 1GCCS14ZXR
I have put on a new fuel pump, delphi. New ecm. I can not get my snap on scanner or teck 2 to communicate with the ecm. At aldl, the "a" terminal has battery ground of 12.5 volts with key off. When u turn key on, "B" terminal has not the required 5 volts. The ...
1995 Chevrolet G20 Chevy Van 5.7L Excessive Emissions, Stall VIN: 1GBEG25K1S
This van will run good for a while, then right injector will loose pulse signal from ECM. Then at random left injector will stick open and remain open after engine stalls.We replaced ECM but we had the same problem. I traced wires from ECM to injectors,inspect...
1995 Chevrolet Tahoe LS 5.7L brake pedal VIN: 1GNEC13K3S
when you start the engine the pedal will slowly go all the way to floor you can pump it still goes to floor.i believe it is in the abs system,but i haven't had any trouble on chevys.is seems like it is by-passing in the abs control unit
1997 Chevrolet Astro 4.3L Poor Idle Quality, Misfire VIN: 1GNEL19W6V
Vehicle came in running very poorly. Very rough idle with considerable power loss. Cust had tune-up and fuel sys flush done at another garage which did not help problem. Found slightly leaking EGR and replaced valve. Also found fuel pressure leak down and repl... Trouble codes: P0300 (Random Misfire Detected), P0306 (Cyl 6 Detected)
1997 Chevrolet Cavalier 2.2L Anti Theft Deterent VIN: 3G1JC5249V
We are now stuck with a hard code of p1629D we have tested throughout the system and we do seem to have the equipment we would need although all of our testing we have done had turned up no reults. we have probed the entire system for voltage and resistance wi...
1998 Chevrolet K1500 Cheyenne 5.0L Pump motor VIN: 1GCEK14M5W
Vehicle has classic low speed activation problem that i can not pinpoint. Scoped front signals down to very slow speeds by hand and maintained about 800mv signal (waveform) and no pulling on the road when activating. Dealer did cleaning and replacement of thes...
1998 Chevrolet S10 2.2L No Start VIN: 1GNDT46XW0
I have a 98 s-10 that has a long crank after a hot soak.The problem is spark and fuel press are right on the bean.this truck sits for 20 min and you can crank the new battery dead without even a pop if you don't let off of the key.If you let off 5-7 times it w...
2000 Chevrolet Camaro Z28 SS 5.7L fill neck VIN: 2G1FP22G7Y
customer came in this morning complaining that she could not put gas in her car and that it was spiting it back out. I took the car to the gas station to see what it was doing and I found nothing wrong. This car has only one hose from the fill neck. The anti-s...
2000 Chevrolet Venture 3.4L fuel guage VIN: 1GNDU03E0Y
fuel guage jumps from 0 - 100% just by shaking van, sweep test of guage with scanner is ok. pcm reads them same readings as dash guage. supposed to have new sending unit, did not drop tank to check.
2001 Chevrolet Impala LS 3.8L 1-2 shift VIN: 2G1WH55K81
Customer came in for a transmission filter and gasket service and ever since customer states that it has a late shift from 1-2. Is there anything that I could have done? Please Help!!!
2002 Chevrolet Suburban 1500 LS 5.3L Starting VIN: 3GNFK16Z92
hey guys i have an intermitten draw here would appreciate some insight. previous tech replaced alt and batt for a "no start "condition. since then the battery has ran dead on a couple of occasions. checking for a draw with a test light and fuse puller has unco...
1997 GMC Sonoma SLE 4.3L Driveline VIN: 1GTCS19W7V
Hi all, This Sonoma has presented with a drivetrain growl. It is a low pitch growling sound which is fairly loud. Can be heard only when accelerating. Goes away almost entirely when coasting. Gets louder the harder you accelerate. Also increases some with roa...
2007 GMC Yukon SLT 5.3L radio VIN: 1GKFC13J37
Hello all , I am from Kuait (Middle East) the customer buy this Yukon from USA. the Radio tuner system in USA is defront from Middle East, we have option to chang this by SPS I have done this too meny times in other old year modiles, but this one when I done S...
2000 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NV52E5Y
Sometimes when you go to start this car when you first turn the key on the fuel pump doesn't run the 2 second prime that it should and the car won't start when cranked its not getting power to the pump. Usually if you turn the ignition off then back on again y...
2001 Pontiac Grand Prix GT 3.8L reverse VIN: 1G2WP52K21
1993 Saturn SL1 1.9L lock cylinder VIN: 1G8ZH5594R
To all saturn techs, I must be blind because I am trying to replace the ignition lock cylinder on this 1993 Saturn SL1 4 door sedan and I cannot find the hole where you push on the tab to release the cylinder. Am I missing something here? Thanks in Advance ...
1995 Saturn SL 1.9L rear brakes
vehicle has not fluid getting to rear wheels. I am able to get pressure out of both lines at master cylinder. good pressure from bleed valves on abs unit. there are four lines that come out of abs unit. the front line and the rear line, when opened and pedal d...
2002 Saturn Vue 3.0L Mechanical VIN: B32S804897
This is a 2002 Vue we bought with a noisy engine had a siezed cam in the frt head, removed head, there was a piece of plastic blocking the feed hole where the head bolt goes in, removed it, checked the bottem end bearings and all looked good, put it back toget...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M3T
we removed excessive carbon build up from egr tube w/ coat hanger. thankyou all!!! Trouble codes: P0401.
1992 Cadillac Seville 4.9L MIL Lamp on VIN: 1G6KS53B3N
thanks again ,doont know what i would do without you guys,ground, ground ,ground.i checked the grounds.i moved all grounds and cleand them , problem went away.i dont know which groun fixed it but ones under hood had alot of rust thanks again. p.s i did remem...
2000 Chevrolet Astro 4.3L Hesitation, Cuts out, Stall, Bogs down VIN: 1GNDM19W1Y
Hello everyone, thanks for all the help, I had tried moving the distributor one tooth to no avail. Didn't see much slop in the timing chain either. Luckily on Saturday the fuel pump completely went out. That took care of my runnability issues. The cam ret...
2003 Chevrolet Express 3500 6.0L Poor Idle Quality, Stall VIN: 1GCHC39U53
A MASS AIR FLOW SENSOR FIXED THIS VEHICLE IT IS NOW RUNNING NORMALLY Trouble codes: P0175 (rich bank 2), P0172 (rich bank 1), P0154.
2004 Chevrolet Express 1500 4.3L no injector pulse VIN: 1GCFG15X44
Vehicle is fixed. Problem ended up being the lock cylinder housing/passloc sensor. Keep in mind the vehicle set no security codes at any time. The security light would flash only while turning to the crank position and then turn off when going back to the r...
2005 Chevrolet Silverado 1500 5.3L dash lites VIN: 1GCEK19B95
i'm closing this even though i'm not sure of the fix because i wont be using the truck for the next few weeks.i checked all the grounds,unplugged and plugged conn. at the lite sw. and bcm. the problem did not reoccur while driving 200 miles this weekend i wil...
2004 GMC Envoy XUV SLT 4.2L air compressor VIN: 1GKET12S64
Well first off let me start by saying I didn't get a whole lot of responses here, and one of them I am sure they did not even read my post, because it states that I tried scanning the system and the codes needed to be flashed out. But anyway enough ranting, T...
1995 Oldsmobile Cutlass Ciera 3.1L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G3AJ55M3S
the problem on this vehicle ended up being the crank sensor located on the rear (or firewall) side of the block. When it got hot the signal would flatten out on acceleration. It was deceptive to find as the code was a cam sensor "performance" issue & the diag... Trouble codes: P0341 (camshaft position sensor extra cam pulses).
2001 Pontiac Montana 3.4L cluster (trip meter) VIN: 1G5839T452
everyone how said the cluster board was wright on the money . thanks for all the great help.
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F32
Replaced fuel tank pressure sensor and cured problem.Thanks to all who replied. Trouble codes: P0440.
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