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Prev Professional Automotive Repair Technical Discussions for September 29, 2011
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Help Request Answers
1994 Buick LeSabre Limited 3.8L Poor Idle Quality, Misfire, Vibration VIN: 1G4HR52L3R
This Buick is driving us nuts. It has a vibration that feels like an engine misfire under acceleration, and only at low RPM, under low throttle. Once it reaches 2500 RPM it is gone, and isn't really there under hard throttle. It is most noticeable when pulling...
1995 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G4HP5217S
cust states would not start had vats system repaired and ran good for 3 days then started to lope at idle cel light on trans will not shift correctly. we do have a tech 2 and a master tech scantools neither will communicate with pcm removed all other modules f...
1982 Chevrolet Corvette 5.7L Misfire VIN: 3GA1Y61851
other shop has done alot of work. distrutor plugs wire. it run rough intermittedley. other times its perfect. no one has missed with throttle body stop srews. it feels like ign. but i woudn't bet on it. the injector spray pattern looks diferent ant the injecto...
1998 Chevrolet C2500 Cheyenne 5.7L stoplights VIN: 1GCK24R5WE
Thanks in advance for your help. I have no power to the stoplight switch and I need to know which wire is the feed from the stop/hazard fuse. I believe it is the orange one, just need confirmation. Very difficult to work under the dash on this and I just may r...
1999 Chevrolet Malibu 3.1L suspension VIN: 1G2ND52M8X
This car pulls to the left. I had a post on this awhile back and thought it was fixed hadn't heard from the customer. Now I find out it still pulls. It has had new front coil springs and struts. New strut mounts. New brake calipers and hoses. It has been align...
2003 Chevrolet Impala 3.4L abs module VIN: 2G1WF52E83
abs code C1298 pcm class 2 serial data link fault, pcm code [...] comm EBCM-checked powers and grounds using a headlightusing the grnds in connector light bright, loaded system with vechile running no change,run a redundant power from battery to pink ing w...
2004 Chevrolet Cavalier LS 2.2L Fuel Gauge&High Beam Light Indicator VIN: 3G1JH52F14
This seems to be a very clean and well kept can tell that it was in a small fender bender on the left front .it was brought back for;gas gauge sometimes on e sometimes all the way over full in the way of temp gauge.also high beam indicator light works ...
2004 Chevrolet Aveo 1.6L rear sway arm VIN: KI1TD52614
vehicle has loud banging in rear, broken controll arm bushings in rear, where rear arm attaches to body.. dealer says not available separately... $475..local parts guy says no listing..looks lika a pressed in bushing..anybody know where to source these bushing...
2006 Chevrolet Equinox LT 3.4L monitors VIN: 2CNDL13F06
After replacing the head gaskets on this Equinox(3.4), the catalyst and evap monitors will not run the test. This vehicle has been driven over 200 miles by the customer and by us. We have driven the "drive cycle" requirements and still cannot get either of the...
2007 Chevrolet Impala SS 5.3L Battery VIN: 2G1WD58C17
What Is the Allowable Parasitic Draw? I was told 100ma is ok but others said under 50ma Nothing is tied into the courtsey circuit
2007 Chevrolet Suburban 1500 LS 5.3L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNFK16377
Hey guys, So this one is interesting. First off, lots of lights going on in the dash.. Chk engine, Check stabilitrack, Check traction control, Tire pressure light. Performed basic testing for the cyl 1 misfire. Concluded that the intake valve for cyl 1 is not ... Trouble codes: P0300 (Random Misfire), P0301 (Cyl 1 Misfire), P0449 (Evap Vent Control Circuit Intermitent), C0561 (ABS Module RAM/ROM Circuit)
2003 GMC Yukon XL 1500 SLT 5.3L abs VIN: 3GKEC16Z93
This one came in with the usual ABS codes, po265. Sent module for repair and now has a hard co251. All grounds have been checked leading me to believe this module is bad, internal solenoid failure. Has anyone seen this and what was the fix. Used and reman unit...
2006 GMC Envoy SLE 4.2L Stereo VIN: 1GKDT13S76
Hi all in IATN land. This Envoy has an intermittent problem with the rear speaker system. It is very intermittent and usually on start up. The right rear speaker will quit playing music and will emit a noise that sounds like alternator. If you disconnect, then...
2005 Pontiac Grand Prix 3.8L Master Cylinder VIN: 2G2WS52215
GM techs help please, I have a customer with a 2005 Pontiac Grand Prix with the dash red brake light on and a message center display for "low brake fluid". There is a master cylinder reservoir full of fluid though the fluid does look very dark. Unplugging the ...
2006 Pontiac Grand Prix GT 3.8L ABS and stability VIN: 2G2WR55486
I have already replaced the sensor but the light came on again.Clearing the codes in the bay results in the lights resetting immediately.On a long road test the sensor works perfectly while monitoring speed output from all 4 sensors.I read a couple of brief de...
2003 Saturn Vue 3.0L Cuts out, Stall VIN: 5GZCZ63B13
I have 2003 saturn vue with the 3.0l v6 that will stall/cut out after 20 min drive. have replaced the crank sensor, ignition switch and bcm. sometimes it will only cut out and continue running and other times it will cut out and die. the only code i get is p16... Trouble codes: P1629
2006 Saturn Vue 3.5L Latch VIN: 5GZCZ63466
Cannot open left rear door from inside or outside handles. Partially removed inside trim panel to gain some acess but still cannot open. Can see the latch arm is moving the full way but will not release door. Has anyone run it this & is there a way to open wit...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Custom 3.1L Odometer
The car lot that owns this vehicle decided to send the cluster off and get it repaired. Many thanks to all who replied and especially Patrick who sent me a link that shows how to repair the cluster. Tried looking under freeze frame DTC data as suggested and s...
1986 Cadillac DeVille d'Elegance 4.1L Excessive Emissions VIN: 1G6CD6983G
Turn out the fix was right under my nose, the vacuum that was bleeding down was the problem. I remove the vacuum control switch and clean with shop air, reinstall and moniter on dyno, it remain steady at 10 psi. Perform test and nox was reduce to 345ppm at 15 ... Trouble codes: 30 (Idel speed circuit).
1992 Chevrolet Camaro RS 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G1FP23E5N
thanks everyone for all your help, i was getting min. reading allowed on the fuel pressure so i changed the pump and screen and runs like a champ now.
2003 Chevrolet Tahoe LS 5.3L Auto headlamps / DLR VIN: 1GNEK13Z83
I would like to give a big thanks to Charles for doing some research on this. I talked to local dealer today and they can get the VCI and then reflash BCM. Also I would like to thank Russel for the tip on the shift indicator light. I am tackling that in th...
1999 GMC C-Series Topkick C6H042 7.4L Electronic VIN: 1GDJ6H1D5X
Thanks to Todd the truck is fixed. He told me the aux brake system is the electric motor on the booster. If you lose hydraulic boost then the (aux) motor kicks in for boost. Todd sent me a wiring diagram which led me to find a bad multifuntion alarm module. Re...
2005 GMC Sierra 2500 HD SLE 6.6L Radio VIN: 1GTHK23265
Thank You for all the replies. The general concensus was that it took a Tech 2 to replace a radio beyond 2004 so we sent him to the dealer. Special thanks to the tech who explained that the # of doors and speakers etc had to be programmed in which made it all ...
2000 Oldsmobile Bravada 4.3L Ck Eng Lite VIN: 1GHDT13W0Y
2004 Saturn Ion-3 2.2L Engine VIN: 1G8AW14F54
Thanks to all that replied...problem actually was in the transmission. Vehicle was in an accident and damaged something internally in the trans resonating through the bellhousing and back of engine. rebuilt trans and noise went away.
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