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Prev Professional Automotive Repair Technical Discussions for January 12, 2009
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1995 Buick Riviera 3.8L Excessive Emissions, Poor Idle Quality, Surge, Stall, Misfire VIN: 1G4GD2210S
vehicle came in with used engine installed from other shop, vehicle will start after multiple tries, will barely hold idle with multiple misfires, poor emmisions, no acceleration at all, acts as if cat plugged, or fuel pressure low, fuel pressure 41psi at idle... Trouble codes: P0171
2001 Buick Regal GS 3.8L headlamps VIN: 2G4WF55161
have no low beam headlamps. have power to lamps but no ground. had code for auto light relay or module but lost it trying to duplicate. no codes come back. shows 3.26 volts on light sensor. have checked bulbs and are ok. customer states this happened all at on...
2000 Cadillac Escalade 5.7L engine bucks VIN: 1GYEK63R4Y
when i start up cold its alright when it heats up the engine loses power no pedal it goes 5 miles an hour it has 58 lbs of fuel pressure great spark tried to swap mass air flow meter no difference put new converters on still no difference timing is right on th...
1990 Chevrolet K1500 Cheyenne 5.7L Hesitation, Cuts out, Misfire VIN: 2GCEK14K3L
Hello Gentlemen and Ladies, I looked through the archives and couldn't find one quite like the problem I am having with this truck. First off I admit I am not a driveablility guru and I am sure this may become apparent soon enough. Story goes like this, When y...
1991 Chevrolet Astro 4.3L speedometer VIN: 1GCDM15Z5M
i need help wih this astro van. i adopted this from another tech at the dealership. this vehicle has had multiple cluster replacements due to speedometer inop. it works evertime after being repaired. it came in a few weeks ago and was diagnosed as needing the ...
1994 Chevrolet Lumina Z34 3.4L spark plug VIN: 2G1WP14X2R
This lumina blew out #6 plug. There are about 2 threads left in the bottom of the hole. I know helicoil is unuseable because it is a taper seat plug {unless you pull the head} but i have read about other inserts that could work. Has anyone else had any experie...
1995 Chevrolet K2500 Suburban 6.5L Cuts out, Stall VIN: 1GNGK26F0S
engine dies intermittently if you drive it around town, stopping and starting like going in stores, useuly after 1/2 to 3/4 hrs while driving it dies & sometimes it won't die complettly. we find no codes the check engine light never comes on we find no drop in...
1997 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R3V
I've got a wierd problem with this van, the basic problem is no spark from the coil. The think is it's intermentent and when it does run I can wiggle or move the wireing harness under the hood near power distribution center and it will cut up and die. Then no ...
1997 Chevrolet S10 LS 4.3L Misfire VIN: 1GCCS19X1V
this truck has a misfire in cylinder #5 only at idle. compression is 150-160 in all the cylinders,ignition system is good checked coil out put ios good cap rotor wires and plugs have been checked and changed just in case. injector balance is ok and id... Trouble codes: P0305
1998 Chevrolet K1500 Cheyenne 5.7L Hesitation, Cuts out VIN: 2GCEK19R9W
Good day people. I have this vehicle that will intermittently cut out while driving down the road. The vehicle will usually restart right away. Sometimes it will almost stall, and the tach will drop to about 300 RPM's. The client will step on the gas and nothi...
1999 Chevrolet Venture 3.4L wiper VIN: 1GNDX03E8X
Wiper is operating only at the high speed mode. There is no reponse at the intermittent mode and the slow mode. I suspect the wiper switch failed. I have no idea how to check the wiper switch? Is there anything else that I should check in advance before replac...
1999 Chevrolet Silverado 1500 5.3L pressure control VIN: 2GTEK19T8X
hey guys need a little help here. i got this truck with mil on code p1810. checked archives nothing really matches. truck shifts fine ohmed pressure control solenoid reads 4.1 ohms (3.5-8 specifications). also the 4x4 electrical control doesnt always work, but...
2000 Chevrolet Express 2500 5.7L Cuts out, MIL Lamp on VIN: 1GCGG25R3Y
This van dropped in this morning and was running perfect in every way except the CEL was on. The men said it would buck and cut out very intermittently. I checked and found the codes listed. The freeze frame data varied very little on the fuel trim from code t... Trouble codes: P0171 (Fuel system lean B1), P0174 (Fuel system lean B2), P0340 (Camshaft position sensor problem), P0341 (CKP circuit out of range)
2000 Chevrolet S10 2.2L radio VIN: 1GTCS1953Y
we have a 2000 s-10 that we need a radio code for we tried the 800 number and both dealer codes , but nither one would work, we have a scramble code of 292/294, does anyone have another dealed number that works or can you get us the code, thanks in advance for...
2001 Chevrolet Blazer LS 4.3L Hesitation VIN: 1GNDT13W71
mitchell say's fuel pressure 60-69 psi vehicle is reading 55 psi max koeo and koer. what is the correct fuel pressure for this year and model. i know typos have been found in mitchell just trying to find correct psi specs.
2002 Chevrolet Monte Carlo LS 3.4L ipc VIN: 2G1WW12E52
gauges were inop at times ,no fuel gauge , no coolant temp, tach erratic, charge indicator on, odometor all segments light ,seat belt and airbag flashing alternately. cked power and grounds o.k. replaced the cluster. same problem big mistake. only other though...
2003 Chevrolet Silverado 2500 6.0L Starting VIN: 1GCHC24U63
This is for our neighbor shop who is having trouble with the vehicle. with the key in the start position the engine will crank for about 2 second then stop, crank for about 2 seconds then stop and continue like this. From what they've said the engine will star...
2003 Chevrolet Silverado 3500 8.1L No shift, No communication w/TCM VIN: 1GCJK39GX3
This one was brought to me from a trans shop. No shift. No PRNL reading on dash. Check engine light and ABS lights on. Found PCM codes P0802 - Engine torque signal ckt, P1571 - Traction control torque request ckt, ABS code c0055 - VSS ckt, Transfer case code U...
2003 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCHK23U53
Hello all, and thanks in advance, I have this 2003 chevy 2500HD that is setting mainly the p0300 code but, has twice set the p0101 code, misfire history shows misfires mainly on cylinders 4 & 6, I have moved the coils, plugs, wires, injectors, and these cylind... Trouble codes: P0300 (Random Misfire), P0101
2005 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDT13SX5
customer complaint is stall when putting defroster on. problem verified. no codes. out put test allows proper control of idle speed. when pcm gets request for a/c from either defrost selection or a/c selection of manual a/c system controls the engine immediate...
2005 Chevrolet Cobalt 2.2L Airbag Control Module VIN: 1G1AK52F35
I am replacing the SDM in the Cobalt with a used unit from a sister Cobalt. Can I perform the SDM ID Relearn and SIR Module Setup with a Genisys Scan tool, or do I need to have a Tech 2?
2004 GMC Sierra 2500 HD SLE 6.6L No Start VIN: 1GTHK231X4
We are primarily a drivability specialty shop but I have no experience with diesel fuel supply/delivery. I am posting this for my brother-in-law on his personal vehicle and any help would be greatly appreciated. Problem: truck will not start. Air is entering s...
2005 GMC Canyon Z71 SLE 3.5L lack of poor air volumn to defrost VIN: 1GTDT13635
Customer complaint not enough air coming out the defrosters. doors work good and direct the flow of air properly. there is air comming out right at the center of the defrost ducts but not at the outside.the sidew window vents work good.have checked another cus...
1997 Pontiac Grand Prix SE 3.1L Poor Fuel Economy VIN: 1G2WJ52M4V
Thanks in advance. This pontiac is kicking my techs butt. At idle and on decel with throttle plate closed the Ltft is -15 at idle and at decel with throttle plate closed. Unhooked evap system, replace oxygen sensor, tested egr and replace it known good valve, ...
2000 Saturn LW2 3.0L camshafts VIN: 1G8JW82R5Y
replaced cylinderheads on this lw2 but camshaft sprocket numbers were not marked, were does the guide pin on each camshaft align with which number. I tried the obvious 1/1,2/2,3/3,4/4 and it is not in time. Any help would be great. thanks.
2003 Saturn Vue 2.2L Power Door Locks VIN: 5GZCZ23D93
Keyless Entry goes inop after an hour. If you manualy unlock the MPV they will work again. Is the BCM going into sleep mode and not waking up? No codes set. Security light stays flashing went locked,and it goes inop.

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Regal Custom 3.1L Poor Idle Quality, Stall, Misfire VIN: 2G4WB54T6M
due to tight money no return of customer yet. i was told to ck. injector found out i could actually listen to it click as it fired. more leaned towards fixing the misfire warm,than the rough idle problem.if i get it back a IAC motor may be my next effort. than...
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y0T
Thanks to all on the system for the time to read and offer help. Many good ideas on 02 sensors, PCM groundsí and sensor circuits. Mainly vacuum leak sources at backfire valve, throttle body shaft, and egr passages including egr passages present in coolant cros... Trouble codes: P0171, P0174.
1999 Chevrolet Monte Carlo LS 3.1L Hesitation, Cuts out, Stall VIN: 2G1WW12M3X
Thank you to AL [...] 14 replies. All had good ideas and great starting points. First I cleaned the MAF sensor. No luck. Checked the harness for rubbing and broken wires. Again no luck. Scoped the MAF and crank sensor in the block and both had great waveforms. Scop...
2000 Chevrolet S10 4.3L No Start VIN: 1GCDT13W31
I'm sorry to all the techs that I let hang on this one but between plowing out of the snow bank and the frigid temps This is the first time that I had a chance to get back to this. We found later that day that there was a problem with the schrader valve in the...
2000 Chevrolet Blazer LS 4.3L transfer case / diff VIN: 1GNDT13W5Y
Most replies suggested looking at the front axle lock system. The 4WD button lights flash when the front axle isn't locked yet. The front axle locking system uses a vacuum powered actuator and cable, vacuum hoses, and a vacuum switching valve located on the ...
1992 Oldsmobile 98 Regency 3.8L rf caliper VIN: 193CX53L5N
Thanks for all the replies. When pinching off the hoes to the right front caliper it did not change the pedal feel. Could not get my scanner to bleed the abs unit. Ended up bleeding master cylinder at lines, then moving on to abs unit at lines, then the rest o...
2000 Oldsmobile Bravada 4.3L tccm VIN: 1GHDT13W0Y
Sorry for the wait, customer was out of town for a month, and I it had been sat on our lot for that time. As one of the replies stated the shorted t-case motor probally took out the TCCM put in the replacement today and it's all working as it should.
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