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Prev Professional Automotive Repair Technical Discussions for November 14, 2011
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Help Request Answers
2006 Buick Lucerne CXS 4.6L master cyl abs modulator VIN: 1G4HE57YX6
Customer presented vehicle with complaint of pedal going to floor. We could not verify this with a road test. So much for assuming. He needed rear brakes and we suggested a master cylinder. Road tested vehicle, everything seemed fine. customer returned with sa...
1999 Cadillac DeVille 4.6L Engine VIN: 1G6KD54Y0X
R&R thermstat n pressure tested coolin system on rad side bank n ok with no water comin thru spark plug holes.while crankin..may have to let it sit longer.w/spark plugs out.waitin for results on other bank.did notice that engine ran hot gradually n also rad ca...
1968 Chevrolet Camaro 5.7L Cuts out
This vehicle has been retro fitted with a Tuned Port Injection system off of a 1988 corvette. The car ran good for about 18 months then the fuel pump went out. The customer provided me with a replacement pump and when installed had good pressure at idle but pr...
1983 Chevrolet S10 2.8L alt VIN: 1GCCS14B2D
this is a v8 race/street truck. I bought it un-finished. The only problem left is a no charge condition. The truck has an old style white two wire plug delco alt in it. Is there a way to wire this so it will charge or should I go to a single wire alt? I would ...
1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Cuts out, Backfires VIN: 1GCHG39R0X
Got a headache here. Van came in for rough run and high idle. Found a list on dtcs. PIDS in computer were all over the place. Inspected the PCM and found that it was cracked wide open and severely corroded from brake fluid leaking on it. Replaced PCM (OE Part)...
2000 Chevrolet Blazer LS 4.3L Transfer case VIN: 1GNDT13W8Y
Thanks in advance for any help you can provide me. I have this Blazer that came into the shop with no 4wd operation. We diagnosed it and replaced the TCCM due to the fact it was full of water and the pins were very corroded. Test drove it and the 4wd worked no...
2001 Chevrolet Impala 3.8L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 2G1WF55K01
This vehicle came to me after 2 other shops have tried to fix. When first starting out from stop vehicle will hesitate one time, feels like a fishbite, at cruising speed around 45 MPH will have what feels like multiple missfires or engine is just cutting out r... Trouble codes: P0102 (MAF circuit Low), P0171 (Lean bank 1)
2005 Chevrolet Equinox LS 3.4L abs VIN: 2CNDL23F65
Thanks for your help in advance I have this Equinox that is haunting me replaced both wheel berings and repaired wiring coustomer drove the car over 1500 miles and codes and abs lights came back on. its setting co335 lf wheel bering circut malfuntcion also tra...
2007 Chevrolet Silverado 2500 HD Classic LS 6.6L MIL Lamp on VIN: 1GCHK23D87
this one is very hard to find wire diagrams for this circuit. glow plug lamp never comes on. using tech 2 check lamp/indicater tests- still cannot turn on wait to start lamp. this brings me to think the problem is in the cluster. has anyone had this problem b... Trouble codes: P0381
2008 Chevrolet Silverado 2500 HD LTZ 6.0L tpms VIN: 1GCHK23K48
If anyone has an answer for me besides the obvious one i would appreciate it. This my own truck, i am looking to see if there is anyway to either disable the tpms system, or lower the pressure that GM wants you to run. I do not need to run 80psi in the rear ti...
1998 Pontiac Grand Prix GTP 3.8L No Start VIN: 1G2WP1219W
Car is a no start found to have no spark. It has fuel pressure injector pulse just no spark. It never quits once it is started. It just seems to be a no start at times. As stated I replaced the ignition module already and after I did it started and ran for abo...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick LeSabre Custom 3.8L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G4HP52KXT
Well family & friends cars always seem to hang around because you get busy in shop with paying customers. Once I got car to shop - I removed the used ecm module & the used ignition module. I started with the basics. yes battery ground to engine and the ground ... Trouble codes: P0336 (Crankshaft position sensor circuit).
2004 Cadillac XLR 4.6L steering VIN: 1G6YV34A44
Customer needed car to go on trip(why he took the car making noise ?)and has not brought it back yet.The problem at my shop is I don't have a drive on lift,it does not make the noise with the wheels hanging down on a two post lift.One suggestion from Troy said...
1979 Chevrolet El Camino 5.0L cruise control
it was the switch. replaced it and it works fine also had vaccum leaks. the big problem was getting wright switch. everyone said this didn't have cruise switch on column.
1998 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R1W
Thanks to everyone. changed cap for the third time. still not running right. need to put her truck on back burner, working 2 jobs, & don't have the time to investigate other options at this time. will post any improvements as i find them. Trouble codes: P0300.
1999 Chevrolet Malibu 3.1L Hesitation, Cuts out, Stall VIN: 1G1ND52M1X
After scoping both crank sensor and the cam sensor I found that the cam sensor signal was erratic when cold but cleaned up once engine warmed up a bit.I replaced the cam sensor and signal is clean all the time and my scanner says cam sensor present all the ti... Trouble codes: P0341.
1999 Chevrolet Blazer 4.3L fuel and temp gauge VIN: 1GNDT13W0X
First of all, THANK YOU ALL!! I did indeed have 2 problems. Fuel pump module fixed fuel gauge jumping. Following your advice I traced grounds. Well waddya know? Aftermarket alarm remnants under dash. Removed that, and now all is normal. And just for general in...
2001 Chevrolet Malibu LS 3.1L No Start, Stall VIN: 1G1NE52JX1
One thing I didn't do at first was to actually check the data line at the DLC for activity/shorts with a DVOM. Found it active with varied voltage. This told me there wasn't a module pulling it down. Did remove R/F seat to access AirBag SDM under carpet, wh... Trouble codes: U1064 (Loss of comm with BCM), P1626 (Theft deterrent fuel enable signal lost), U1000 (Comm line down).
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