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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 24, 2010
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Open Help Requests for GM
Help Request Answers
1983 Chevrolet Camaro Z28 5.0L straight tracking VIN: 1G1AP87H1D
Vehicle will not track straight on a crowned roadway. When driving on a crowned roadway, vehicle drifts out of straight ahead track and when reaching highpoint of roadway, it pulls firmly in either direction equally. Problem is slight on a level roadway. Probl...
2000 Chevrolet Express 2500 LS 5.7L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GCGG25R1Y
hi, everyone this van was driven in ,running trouble look like running on 4 or 5 cylider, stored code were p0102, p0141 , p0171 . p0174 , p1351 , reman m.a.f , new ic installed but no improvment! on datastream show cylinder #2 and # 7 missing. fuel pressure ... Trouble codes: P0102 (m.a.f sensor), P0141 (o2 sensor b1 s2), P0171, P0174 (bank 2 lean), P1351
2002 Chevrolet Trailblazer LS 4.2L Safety VIN: 1GNDT13S22
hello all! 1st i always seem to stuggle with u-codes argh.i have this vehicle with the air bag lite on constant all the time.it does flash the amounted times before comung on steady.i can comunicate with all the modules except the air bag.so i canot retrieve a...
2002 Chevrolet Silverado 1500 4.8L Poor Idle Quality, Misfire, MIL Lamp on
vehicle came in with engine light and misfire. cust did a tune up but did not fix problem. checked vac, looked for leaks, did fuel pressure test pressure was 50psi replace filter no change. pressure would drop of as soon as key was turned off. replaced fuel pu... Trouble codes: 300 (random/ multi missfire)
2003 Chevrolet Tahoe Z71 5.3L Transfer Case VIN: 1GNFK16283
Vehicle is in due to Service 4x4 light on on dash, 4 wheel drive selector buttons inop. Scan of vehicle pulls up code 306 motor a/b circuit fault. Replaced encoder motor and Transfer Case Control Module and still same problem. Complete test of related circuitr...
2007 Chevrolet Trailblazer LS 4.2L ebcm VIN: 1GNDT13S67
i don't know what happened on this one. vehicle came in with a p2119,throttle body code, p0496 purge solenoid code.replaced both items and reflashed computer using snap on pass thru pro 2. runs great no codes, but now i have a abs and brake light on solid. i t...
2007 Chevrolet Impala LTZ 3.9L MIL Lamp on VIN: 2G1WU58R47
is this a real code? can not find any info for this dtc. please help? Trouble codes: P3400
2008 Chevrolet Silverado 2500 HD LT 6.0L Turn signals VIN: 1GHCHC29K6
Hi everybody, and Thanks in advance for you suggestions. I'm having some difficulties trying to repair this Pick-up. Only The turn signals front right upper and lower do not work at all. Even when I turn on the emergency lights. All the rest work, although the...
1996 GMC C3500 Sierra SL 6.5L Stall, Lack of power VIN: F5TJ514291
While driving the truck it has a lack off power then it just stops running like the key is turned off.It well restart right away.Then it could quit and you have to wait and then it it'll restart.The data stream recorded shows the fuel temp. goes from 77 f to 1...
2003 GMC Yukon Denali 6.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GKEK63U43
this denali is killing us. after a simple tune up and mass air flow sensor replacment and replacing the intake manifold assembly (burned through from shorted knock sensor harnness) causing vacuum leak. we replaced both knock sensors amd harness from gm.we did ... Trouble codes: P0101, P0171, P0174, PP300, P0327, P0332
2008 GMC Sierra 3500 HD SLE 6.6L Brake pedal VIN: 1GTJCSS6X8
Thanks for any help! This truck lost its brake pedal about 300 miles after a 4 wheel brake job. It was returned to the dealer and the system was bled, which restored the pedal. After aprox.300 miles it lost the pedal again. The dealer replaced the master cylin...
2002 Oldsmobile Bravada 4.2L speedometer VIN: 1GHDT13S62
good morning techs, the van came in after trans r/r/oh for no rev ,after trans shop o/h noticed no speedo ,called owner and she said abs lamp came on speedo would quit,.van brought to me. vss will not read on scan tool .i have cked vss signal back to pcm and ...
1998 Pontiac Trans Sport Montana 3.4L sliding rear door VIN: 1GMDX03E1W
hi all techs i need some help with this one sliding door only open if u open it manuly it doesnt with switch ones it open u can closed w/switch if i let sit for a while it work fine only one time and it stop working againg i can only hear click at relay in the...
1993 Saturn SL2 1.9L brakes VIN: 1G8ZK5574P
im offically stumped and confused. vehicle came in last year with a low pedal. it had frozen slides front and rear so we replaced them with loaded calipers and new hoses since the car sat for awhile. someone previously cut the ebrake cables so we also replaced...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY3388M
shout out to derrick in illinois blocked off the iac and got idle to drop like it should be so i concluded that the iac wasnt shutting all the way check for power had a sporratic signal YES YOU KNOW WERE WE ARE GOING "ECM" replaced the computer and the problem...
1994 Chevrolet Caprice Classic 5.7L Poor Idle Quality VIN: 1G1BL52P8R
1994 Chevrolet Astro LT 4.3L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GBDM19W3R
The last thing we wanted to do is pull the upper intake back off.Turns out that dan hit this evil thing on the head by replacing the nut kit.(the feed and return lines).Thanks to all 23 replies.Ya'll are great. Chris
1998 Chevrolet K1500 Silverado 5.7L brake booster VIN: 1GCEK19R2W
Got lots of replies fast. Thanx for clearing up something I hadnt been aware of as a problem w/this noise on alot of vehicles I work on. I'll be noting this as a problem in the future. Although the customer declined the repair @ this time, we did check it out...
2000 Chevrolet S10 2.2L Fuel Gauge VIN: 1GCCS1443Y
When 33 out of 33 Techs said replace the sender, I replaced the sender and yes, it was the sender. I thought maybe I had a gauge problem as well as a sender but no, gauge is fine. Pulling the tank and attaching my Ohm meter to the leads of the sender and getti...
2002 Chevrolet Impala 3.8L fluctuating duty cycle VIN: 2G1WH55K52
Thanks everybody for your responses. We decided to go with a mention from Lane from Michigan. He mentioned how the latest software updates have repaired this problem for him. So before spending too much money on this vehicle we went with the update. Test drove...
2003 Chevrolet Impala 3.4L radio lighting VIN: 2G1WF52E43
To all, I wish to thank our loyal iATN'ers that have given me the guidance I need. Had some valuable comments and suggestions. It sure is good to be able to ask for advice with people that really know how it's done. I recieved responses from Bob, Tim, Richa...
2004 Chevrolet Tahoe Z71 5.3L 2-3 shift VIN: 3GNFK16Z64
Thanks for all the replies. I was looking forward to opening this thing up and seeing what was wrong. Most of you agree on 3-4 clutch, or acummulator piston. Customer wants vehicle back by this Sat. so he elected to go with a reman trans to speed up job. So I ...
2004 Chevrolet Impala 3.8L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on
hi the impala just came back in and found the map sensor to be the problem even though it was reading thanks for all your help
2006 Chevrolet Monte Carlo SS 5.3L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G1WL15C86
Had many helpful emails. I found that the o2 that i replaced were not the correct o2 s. Thanks to all that helped. Trouble codes: P0300 (miss fire detected), P0053 (b1s1 heater resistance range), P0134 (low o2 activity b1 sensor1).
2007 Chevrolet Avalanche LT 5.3L airbag light VIN: 3GNEC12J07
2001 GMC Savana 2500 5.7L ABS Module VIN: 1GTGG29R81
I'm sorry but I have no real useful info to add to this post. My testing led me to suspect a faulty EBCM out of the box. This van was sublet to me from "Shop A". The EBCM I installed was bought by the other shop and delivered to me by th GM dealer. After shari...
2006 GMC Savana 2500 4.8L MIL Lamp on VIN: 1GTHG39V86
This van is fixed!! I got many helpful replies Roger suggested removing the end foam between the intake and the block, and smoke testing the intake. I thought this was a great idea that foam seals pretty good if you had a small leak you might not see the smoke... Trouble codes: P0171 (Lean exhaust bank 1), P0174 (Lean exhaust bank 2).
1997 Oldsmobile Cutlass Supreme SL 3.1L Timing chain cover VIN: 1G3WH12MOV
Thanks for so many replies. Everyone agreed that it can be done without removing oil pan. It is a pretty easy job. Did not have to loosen motor mount, just leave it alone.The 2 oil pan bolts into the timing chain cover were easy to access. Michael had a good i...
2007 Pontiac G6 2.4L Cuts out, Misfire, MIL Lamp on, spark knocking VIN: 1G2ZG58B17
Thanks to those who replied, found bad converter. We didn't repair the vehicle here, it was covered under warranty through the dealer, but customer called us and said it was fixed. Thanks again. Trouble codes: P0301, P0420.
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