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Prev Professional Automotive Repair Technical Discussions for September 19, 2012
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Open Help Requests for GM
Help Request Answers
1994 Buick Century Special 2.2L suspension VIN: 1G4AG5540R
Vehicle came in for rough idle. Performed tune-up; plugs, wires, fuel filter and throttle body clean. Idle with ac on is now smooth. No hesitation. Customer has complained of a vibration even at low speed. Previously the alignment struts and shocks where repla...
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1996 Buick Roadmaster Collector's Edition 5.7L Poor Idle Quality, Misfire VIN: 1G4BN52P3T
Optispark nightmare. Vehicle has slight misfire at idle and with RPMs raised. Not noticable when driving and under acceleration. Data stream shows intermittent misfire counts on all cylinders randomly. Never sets any DTCs. Misfire can be felt in steering wheel...
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1972 Chevrolet C30 Pickup 6.6L brake booster VIN: CCE532V107
This Chevy truck with dump bed sucks brake fluid into the intake manifold and has no pedal pressure. It has the brake booster mounted under the cab. I cannot find the right one. All the boosters I have found are to be mounted on the firewall. Does anyone know ...
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1989 Chevrolet Corvette 5.7L Fuel Injector Pulse VIN: 1G1YY2187K
This headache has been sitting in my bay for 2 weeks now, and I am about to give up hope! This well taken care of 1989 Corvette ran when parked 2 years ago, and the owner went to show the car to sell it and it would not start. Suspecting a bad fuel pump, they...
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1996 Chevrolet C3500 7.4L MIL Lamp on VIN: 1GBJC34J9T
Truck came in for mil light on - p1345 crank/cam correlation. No driveability problems what-so-ever. Cleared code, came back with-in seconds of engine restart. Found tsb for this code with revised flow chart diagnosis. Followed flow chart and i feel i have hit... Trouble codes: P1345 (Crankshaft position / camshaft position sensor correlation)
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2003 Chevrolet Silverado 2500 HD 8.1L A/C System, VIN: 1GCHK23G73
We replace the compressor , drier & orifice tube. The ac pressures were better but still not cold enough. The fan clutch is good. We even tried another compressor but still not cold 60 degrees. I would appreciate any help you can give thanks
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2004 Chevrolet Silverado 2500 HD 6.6L all ecu VIN: 1GCHK23194
customer left windows open during a rain storm, now has no comm w/ several modules such as tcm and abs. I replaced ipc which took care of bcm u codes. if anyone is familiar with water damaged ecu's I would appreciat any input. i unplugged modules and pulled f...
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2004 Chevrolet Silverado 2500 HD 6.6L Surge, MIL Lamp on VIN: 1GCHK23114
Thanks in advanced to all you Duramax diesel techs. Customer originally brought this truck in requesting the replacement of one glow plug. After a detailed conversation I found out the check engine light had been on for several months and it was now time to fo... Trouble codes: P0089 (Fuel pressure regulator controlf), P0404 (EGR problem), P0101 (MAF problem)
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2005 Chevrolet Cobalt SS 2.0L Misfire, super charger blowby VIN: 1G1AP14P85
hello fellow tech i have this 05 chevy cobalt with a super charger and this is the conncern: what happens is when my customer punches the throttle to the floor the super charger boosts the system to muuch and cause excessive crank case pressure pushing the dip... Trouble codes: P0300
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2007 Chevrolet Uplander LS 3.9L transmission VIN: 1GNDV23167
Has a big list of codes.This transmission just stopped pulling forward or reverse,this is in transmission codes.P0562,P0572,P0602,P0603,P062F,P0711,P0716,P0717,P0722 ,P0723,P0741,P0742,P0751,P0752,P0756,P0757,P0842,P0973,P097 6,P1826, It clears codes but under...
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2008 Chevrolet C5500 Kodiak C5C042 6.6L check engine code po101 VIN: 1GBJ5V1928
Inspected all intercooler piping,seals and clamps,inspect pcv lines from both heads.check all mounting gaskets from previous egr replacement.can start up cold and idling will throw code po101 after about 5 minutes with the famed engine down arrow light with re...
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2009 Chevrolet Impala LS 3.5L Air Bag VIN: 2G1WB57K59
Customer dropped car off with Service Air Bag coming on in Message Center. Scanned Air Bag System, Code B0021 OD - RF side deployment loop resistance above threshold. I checked resistance of RF side impact sensor(inside passenger door), it was 33M ohms. In Mi...
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1997 GMC Safari SLE 4.3L Solenoid B VIN: 1GKEL19W0V
Days after overhaul client can back complaining transmission stopped shifting and started like in third gear.Ckecked for codes,came up with P0758 that is Solenoid B.Changed both solenoids A and B and after a couple of day the same thing code P0758.Changed tran...
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2006 GMC Yukon XL 1500 SLT 5.3L Misfire VIN: 3GKFK16Z06
This truck has a misfire on no.1 and 8 cyls.. It misses on No. 1 all the time and No. 8 most of the time. This truck has no apparent vacuum leak with carb spray or smoke machine. Misfire starts right after truck is running and does not change with rpm or load.... Trouble codes: P0300 (misfire)
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2002 Other GM workhorse 5.7L Poor Idle Quality
Thanks to all for your help. This truck came in for an oil change and we saw that the hydroboost was leaking. we changed the oil and also the boost unit. We started it up and the RPM`s were up around 2500 in park. Costumer said it does that sometimes. WE check...
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1990 Pontiac Grand Prix LE 3.1L Stall VIN: 1G2WJ54T5L
After this car gets hot it will stall and wont start until it gets cold again. I have checked the power and ground on the pink-black and black white on the module and its good. The module on this car has been replaced. I also replaced the crak sensor and made ...
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2007 Saturn Outlook XE 3.6L R.F.Turn signal VIN: 5GZEV13737
HI Having problem with this outlook have no power to rf turn signal have traced wirirng back to bcm where it gets it power from have checked circuit using voltage drop and for continuity circuit appears to be fine can power bulbs up from bcm with a power probe...
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Fixes & Summaries for GM
Fix/Summary Answers
2002 Cadillac DeVille 4.6L abs VIN: 1G6KD57Y82
THANKYOU FOR ALL THE HELP GUYS, THE FIX FOR THIS ONE WAS THE LR WSS HARNESS RUBBED THROUGH ON THE ABS PUMP BRACKET. INTERMITTENTLY IT WOULD SHORT TO GROUND THERE WHEN THE WIRES WOULD MOVE JUST RIGHT AND TOUCH IT. CUT OUT THE BAD SECTION AND SPLICED IN NEW WIRE...
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2000 Chevrolet Prizm 1.8L Hesitation VIN: 1Y1SK5487Y
Thank you for all the help / ideas,I still have this vehicle in my posetion, it still has this intermitant loss of power,I have replaced a number of componets to no avail.we go back onto it as the work amount tapers off, I wish i did get a concrete repair. Tha... Trouble codes: P0171.
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2001 Chevrolet Monte Carlo SS 3.8L Unknown VIN: 2G1WX15K41
Thank you very much for all of the help!! The problem was the A/C Compressor. It should be able to regulate the low side pressure but this one couldn't even though it was almost new! Thanks for all the help!!
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2006 Chevrolet Impala LS 3.9L Starter VIN: 2G1WS55146
FIRST OF ALL, THANKS TO ALL THAT REPLIED. CUSTOMER HAD SAID THAT THE AFTERMARKET RADIO WAS IN THE CAR WHEN HE BOUGHT THE CAR AND THAT IT STARTED OK. WE PULLED THE RADIO OUT AND FOUND THE SWITCHED POWER WIRE FOR THE RADIO WAS HOOKED TO THE BCM. CUT THE WIRE AN...
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2003 GMC Sierra 2500 HD SLE 6.6L 1st gear VIN: 1GTHK23113
Thanks to all your replies. It was in the drive line. We replaced 3 joints and center support still had problem. Took back drive shaft loose on rear shaft rotated it 90 degrees and this repaired the shutter? When we removed to replace joints we made sure to in...
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2006 GMC Sierra 2500 HD SLT 6.0L Engine VIN: 1GTHK29U66
Well heres the long and short of it: Owner agreed to worst case price of longblock. pulled motor and tore it down to find issue and see if cost was less to fix. found the lobe on the cam worn down a little and a pitted roller for the #2 cylinder. after making ...
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2007 GMC Sierra 2500 HD Classic SL 6.6L Driver Door Module
Turns out there was a problem with the database on the Tis to Web website. Tech support called my friend back to say it was a website problem that had been rectified. He went back in and was able to program the switch with no problem. Thanks to all who took t...
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2006 Hummer H3 3.5L Battery Drain VIN: 5GTDN13646
Thanks again for the help. It ended up being a bad ignition switch found pin 4 of the switch to be hot with the key off keeping the bcm alive.
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2004 Pontiac Grand Prix GT1 3.8L misc body VIN: 2G2WP52204
While fumbling around with the BCM suddenly everything powered up and communication was established. Upon further inspection wiggling the wire harness right at C1 on the BCM would cause intermitent loss of communication. Took a real good look at the wiring aga...
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