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Prev Professional Automotive Repair Technical Discussions for December 17, 2009
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet K2500 5.7L Misfire, backfire VIN: 2GCEK19K75
engine developed a backfire through the intake. Other shops have attempted to fix with no success. coil puts out 30kv. engine backfires when snapping throttle, also when accelerating agressively. all sensors show good responce and accurate readings.
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1998 Chevrolet Malibu 2.4L No Start, back fires VIN: 1G1ND52TXW
I need help on this 1998 chev malibu, 2.4 dual ohc. Came in on the hook, cranks but no start. Turns over and sounds funny like timing jumped. It back fires through throttle body. Has code p0507,iac code, and b2965 and b1379 having to do with ignition switch. I... Trouble codes: P0507, B1379, B2365
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2000 Chevrolet Blazer LS 4.3L front axle VIN: 1GNCT18W0Y
This blazer came in with a complaint only in 4x4 a clunk from front axle. I test drove under a load in 4 hi it has a clunk from front axle almost feels as if it is slipping. When lifted on hoist no load on drive train noise is gone. I checked vacum switch on t...
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2000 Chevrolet Blazer LS 4.3L front axle VIN: 1GNCT18W0Y
This blazer came in with a complaint only in 4x4 a clunk from front axle. I test drove under a load in 4 hi it has a clunk from front axle almost feels as if it is slipping. When lifted on hoist no load on drive train noise is gone. I checked vacum switch on t...
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2003 Chevrolet Tahoe LS 5.3L limp-in mode VIN: 2GCEK19T13
customer brought this tahoe in because ck engine light came on and went into "limited power mode".found no problems,customer stated he turned key off and restarted and ran fine.the code was po220,which is tps 2 ckt fault.the problem has occured three times in ... Trouble codes: P0220
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2004 Chevrolet Malibu 2.2L hard start VIN: 1G1ND52F04
hey guys i have one here that is driving me crazy.this car starts hard only after a cold soak.has extended cranking then spits and spudders then starts.once started it always starts right up without any hesitaion.no dtc's were found and all data seams to not i...
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2005 Chevrolet Malibu 2.2L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1ND52F25
hello and happy holidays gentlemen, i have a 2005 chevrolet malibu with a 2.2liter ecotech engine. problem at hand is cylinder #2 and #3 have no spark out of the ignition coil. we have replaced the module and housing 3 times for the sake of it just not being a... Trouble codes: P0300, P0141
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2005 Chevrolet Malibu 2.2L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1ND52F25
hello and happy holidays gentlemen, i have a 2005 chevrolet malibu with a 2.2liter ecotech engine. problem at hand is cylinder #2 and #3 have no spark out of the ignition coil. we have replaced the module and housing 3 times for the sake of it just not being a... Trouble codes: P0300, P0141
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2007 Chevrolet HHR LT 2.2L Misfire VIN: 3GNDA23D77
Truck drives fine. Customer drives about 120 miles round trip each day. Light came on agian next day on way to work, P0301 agian. Swapped coils #1 And #4, cleared code. Light came back on agian next day on way to work,P0301 agian. Any suggestions, please. Than... Trouble codes: P0301 (Misfire cyl. no 1)
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2001 GMC Yukon XL 1500 SLT 5.3L transfer case VIN: 1GKFK16T01
Looking for help on a new process 246 transfer case. The transfer case in very noisy in 4 wheel drive but quiet in 2 wheel drive. I pulled it out & dissasembled expecting to find at least bad bearings. I find nothing wrong. The bearings are all smooth, the clu...
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2005 GMC Envoy SLE 4.2L transfer case VIN: 1GKDT13SX5
Hello, Dont buy an envoy! just kidding. We have an 05 envoy that has a loud growl type sound from the transfer case in 4wd. The noise sounds exactly like when a front wheel bearing is ready to fly apart. It makes the noise in 4 hi or 4 low. As soon as you swi...
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2007 GMC Acadia SLT 3.6L Misfire VIN: 1GKER33777
Well Techs I'm looking for some info on a 07 Acadia 3.6 I have low compession on #4 cyl. 115-120 psi. and according to the tech2 it misses on #4 cyl. at idle like at a stop sign and clears up after go take off. At a idle it starts missing and the MIL light bli... Trouble codes: P0300, U0073 (Module off bus)
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Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Rendezvous CX 3.4L Heater VIN: 3G5DB03E85
thanks for the help Steve! I performed the reset procedure for th hvac unit and all worked great! the way i did this was by pulling the HVAC fuses out on the passenger fuse block found just right of the center console. Key off pull fuses for 1 min to reset sys...
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1991 Cadillac Seville 4.9L Digi. Cluster VIN: 1G6KS53B3M
While many pointed to the cluster, I couldn't get a response on how to check it. I pretty much had to base the fix on probability. First, many people had problems with the cluster. Second, no other components that run through the BCM were acting up, only it...
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1992 Cadillac DeVille 4.9L Poor Idle Quality VIN: 1G6CT53B1N
well its finally cured replaced ecm repaired grounds runs perfect thanks again the injectors all ohmed out good
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2003 Cadillac DeVille 4.6L no communication VIN: 1G6KD54YX3
its been two days without problem. all modules came back online after car sat for a few hours. i then cleared the codes out of all 19 modules and reprogrammed the instrument cluster per tsb 04-08-49-029c.(information on i/p is inop or erratic on an intermitten...
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1994 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13W3R
RECHECKED FUEL PRESSURE AND WAS ONLY GETTING 50 PSI.INSTALLED ANOTHER PUMP.AND NOW STARTS MUST HAVE BEEN DEFECTIVE FUEL PUMP.THANKS FOR ALL THE HELP
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1994 Chevrolet Camaro Z28 5.7L No Start, HARD START VIN: 1GCEC19K4S
Sorry for the delay on closing my help request, many things going on in my life lately. I never did exactly figure the problem out on this vehicle. The reason it didn't have pulse when I checked it is because the pcm in this vehicle will kill the injector cir... Trouble codes: 18 (injector fault).
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2000 Chevrolet S10 4.3L 4wd VIN: 1GNDT13WY2
thanks for quick help,had ten members respond in a mater of hours,all directed me to module in kick panel.replaced it and vehicle is done. iatn best tool in my shop!!!
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2002 Chevrolet Impala 3.8L converter? VIN: 2G1WH55K42
Thanks to everyone who replied.We pulled the transmission and found a brand new flywheel.Next we sent it out to our rebuilder who suspected a sprag clutch.When he opened it up he found the chain was skipping and required a total rebuild.The customer supplied a...
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2004 Chevrolet Silverado 2500 HD LS 6.0L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GCHK23U44
Even though the plugs were new, the fuel contamination did kill them. Changed plugs and the truck runs great! Trouble codes: P0300 (Multiple cylinder misfire).
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2006 Chevrolet Colorado LT 3.5L Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GCCS14666
Replaced the cmp solenoid. No more code, runs good. Warren helped by telling about the screens that should be there. I took a closer look at the solenoid and found that one of the three screens was missing and a piece was wedged in the pintle area. even th... Trouble codes: P0017 (CKP-CMP Correlation), P0300 (Misfire).
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2008 Chevrolet Impala LS 3.5L air bag light VIN: 2G1WB55K38
First of all thanks for the few replies, when you are up against a dealership the independant looks like the loser. Specially when you have an arrogant tech. that tells you I have done my part , you diagnose it and I will Flash all the Clusters for an hour, 96...
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1994 Geo Prizm LSi 1.8L MIL Lamp on VIN: 1Y1SK5385R
Spent many hours on this one, If you can imagine it I have tried it, Ended up being the ecm. I wish there was some type of test to prove it or prove something. Very little information on specific testing for this problem. Wish I had something more for you guys...
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1997 Geo Metro 1.0L No Start, Poor Idle Quality VIN: 1GF73TS345
finally got it. this thing would run only with throttle half or wide open but not closed throttle. wiring to oil pressure switch was broken not letting it start. thanks for all the help
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1994 GMC C1500 Sierra SL 5.7L No Start, hard start cold VIN: 1GTEC19K7R
No matter how many times I use IATN, it still amazed at how much knowledge there is to recieve. Thankss to all that offered help. Some replies were repeating what I had already done while others hit the nail on head. After checking all fuel related parts again...
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2000 GMC Savana 2500 5.7L Electronic VIN: 1GTFG25M5Y
Thanks to all who apllied ck circuits from vcm to trans while doing wiggle test found that the vcm was bad replace vcm and light has stayed off thanks to all
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2000 GMC Safari SL 4.3L Misfire VIN: 1GTDM19WXY
Thanks to all.There was a broken wire about eight inches from the ecm.It is a little hard to get to on these lovely vehicles. This sure helps when you get so many great replies.Thanks again.
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2001 Oldsmobile Silhouette GL 3.4L Hesitation, Misfire VIN: 1GHDX23E51
found crank sensor harness to ignition module shorting out on manifold
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