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Prev Professional Automotive Repair Technical Discussions for January 20, 2011
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2002 Chevrolet Blazer LS 4.3L Misfire, MIL Lamp on VIN: 1GNCT18W82
Another hair puller here. The blazer was at the first shop for what we know found out was a ce light problem. They replaced the computer, intake gaskets, timing chain & gear, distributor, and crank sensor. The way we understand from the customer after this it ... Trouble codes: P0300 (Random misfire)
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2002 Chevrolet Trailblazer LT 4.2L Lock Cylinder VIN: 1GNET16S22
Customer had suv towed in because key woul not turn. He took it apart and tried to drill out old lock cylinder himself. Customer destroyed housing, I had to order a new housing from g/m and a lock cylinder from standard motor products, removed steering wheel i...
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2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29183
Hello Everyone, I have been battling this duramax, and was wondering if anyone knew of any good books/manuals with good information on these engines. Mitchell just gives me some basics, and I was hoping for more in-depth tests and specifications. Thanks in ad...
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2004 Chevrolet Suburban 2500 LT 6.0L spacer VIN: 3GN3K26U44
first time we had this vehical in the shop.vehical came in 11-13-10 with a tranny leak, we found loose bolts from transfer case to spacer and a cracked spacer. We also noticed the vehical had a junk yard trans case insatalled. We advised the customer of these ...
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2008 Chevrolet Trailblazer LT 4.2L Liftgate, RKE, interior lights VIN: 1GNDT13S08
Multitude of codes related to class 2 comm. line. Rear liftgate lock inop, keyless entry system inop, interior lights stay on unless override button is pushed. ABS and SES light on (P0300 no symptoms), and tire pressure warning is flashing. Scan tool will not ...
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1996 Pontiac Grand Prix 3.1L MIL Lamp on VIN: 1G2WJ121M5
Vehicle came in with three codes. Checked wiring at MAF-OK. Cleared codes, all three p0102, p1652, p1655 come right back. Trying to help a shop and demo IATN to them - looking for help. Thank you. Trouble codes: P0102 (p1652-), P1652 (p1655-), P1655
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Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CXL Plus 3.4L charging VIN: 3G5DB03E02
Thanks to everyone who replied. I had put a couple of aftermarket alternators on and bench tested them at advance before and after each one. They all tested good. Decided to try a GM alternator from local dealer. GM alternator fixed the problem. Again thank...
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1995 Chevrolet Blazer LT 4.3L No Start, Poor Idle Quality, Stall VIN: 1GNDT13W4S
SORRY I TOOK SOO LONG, BUT THE PROBLEM WAS VALVE TIMING. I PULLED OFF THE TIMING COVER AND FOUND THAT THE CRANK SPROCKET WAS INSTALLED BACKWARDS, CAUSING THE VALVE TIMING TO BE OFF. SUPRISINGLY THE THE CHAIN AND GEARS WERE NOT REPLACED. HOW THEY GOT IT CLOSE T...
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1996 Chevrolet K2500 5.7L No Start, Misfire VIN: 1GCFC24RXT
OMG, I would not have believed it if it didn't just happen! Both trucks with the same NO-START problem. After all I've gone through The fix was a new cap and rotor!! What the...! The one truck's cap and rotor was obviously the problem. Took it off, turned...
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2000 Chevrolet K3500 7.4L MIL Lamp on VIN: 1GCHK33J5Y
I don't feel i have this vehicle fixed.i cleaned maf.replaced fuel filter, cleaned and lab scoped egr and checked voltage and resistance on egr. i verifided o2 sensors with lab scope they work good even when fuel trims are climing on both banks short trims wer... Trouble codes: P0171 (System lean bank 1).
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2003 Chevrolet Silverado 1500 5.3L turn signal/horn VIN: 1GCEK19T73
Thank You for all the replies. I fixed it. Found broken pink wire near under hood fuse box. However, on the otherhand found some smart individual that at the multifunction switch connector. Cut the pink wire and soddered it to the black horn wire. They were ge...
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2003 Chevrolet Trailblazer LS 4.2L Encoder Motor VIN: 1GNDT13S43
I found that the transfer case was jammed up after switching from 2wd to 4wd several times. Took off encoder motor and found that I could not move the shaft going into the transfere case. removed and disassembled transfere case and found that the fork, bearing...
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2004 Chevrolet Silverado 3500 6.0L abs VIN: 1GCHK23U14
Thanks to everybody for confirming our thoughts that the ABS control unit needed replacement. The grounds were ok. Have a great New Year! greg and crew
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2004 Chevrolet Trailblazer LS 4.2L Charging VIN: 1GNDT13S94
Thanks to everyone for there input. Well gene especially thanks to you. You got me thinking when you said how did i measure the voltage. I grabbed the fastest and easiest tool i had which was a test light, and as you probably guessed 5 volts wont light it. So ...
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2004 Chevrolet Cavalier 2.2L Misfire VIN: 1G1JC52F64
Thanks to all for the help and suggestions. I narrowed this down to the ignition module. I had a good signal coming from the ECU timing control outputs to the ignition module but low voltage on the 2 & 3 coils. Not enough voltage to fire the cylinders at all.... Trouble codes: P0300.
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2006 Chevrolet Tahoe LT 5.3L battery VIN: 1GNEK13T26
Thanks for the replies. I had already checked the seat switch and draw was ok. (there were several instances of this in knowledge base). I replaced battery as it was not doind well after totally draining 5-6 days straight and removed the lbec2 50A fuse overnig...
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2007 Chevrolet Cobalt SS 2.0L MIL Lamp on VIN: 1G1AP18P07
The fix for this vehicle was a factory GM MAF sensor. Our first diagnosis was a MAF sensor but we installed an after market one. After MANY lost hours we went back to our original diagnosis and installed a factory sensor. The long term fuel trim went from 19... Trouble codes: P0172.
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2007 Chevrolet Optra LS 2.0L Misfire, MIL Lamp on VIN: KL1JD85Z67
as a last ditch effort I swapped the 1 & 2 cylinder injectors, even though the injector testor looked fine. The problem followed the injector so we replaced it, now all is well. Trouble codes: P0302.
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2002 GMC Envoy SLE 4.2L No Start, Stall VIN: 1GKDT13S22
THANKS FOR THE 3 REPLIES. WE INFORMED CUSTOMER THAT WE NEEDED TO TEAR DOWN THE ENGINE TO INSPECT THE ACTUATOR, UPON REMOVEING THE INTAKE MANIFOLD , WE FOUND PIECES OF OIL RING, PISTON, AND ASSORTED METAL. WE CHECKED WITH OUR BORESCOPE AND # 4 PISTON IS TOAST. ... Trouble codes: P0114, P1514.
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2003 Saturn Vue 2.2L No Start VIN: 5GZCZ33D33
HELLO EVERBODY I WANT TO SAID THANK YOU FOR ALL THE INFORMATION YOU SEND ME ON THIS VEHICLE .I DID FIND THE PROBLEM THE PROBLEM WAS THE ORANGE WIRE (BATTERY POWER SUPPLY) THAT WAS BROKEN. WHEN I DISCONET THE ECM CONNECTOR TO CHECK FOR POWER THE WIRE MUST OFF C...
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