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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 20, 2011
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Buick Park Avenue 3.8L trans default to 2nd speed VIN: 1G4CW53L0P
i have'nt laid eyes on this vehicle. the owner, as stated, replaced the trans 3 times...same result. obviously a control or control circuit issue. what i was hoping to get from my fellow Tech's was a schematic showing the trans control circuit wire colors an...
1993 Cadillac Fleetwood Brougham 5.7L No Start, Stall VIN: 1G6DW5279P
I believe I have a poor connection at one or more pins in the ECM plug(s) I'm tried 2 replacement computers and both react the same. If I can get the car to start it will idle of a few minutes then stall and usually not restart. I've got the computer lying on ...
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on VIN: 1G6KE54Y2X
Code pops instantly, Scoped sensor, good sin wave, 2.5 vlts peak to peak cranking, 5+ vlts idle. tested module power and ground, found steady 5 vlts on ckt 630 camn signal to pcm. Verified no short to ground, power and no vlt drop on wire. Pcm grounds all test... Trouble codes: P0340 (Camshaft Position Sensor Problem)
2001 Cadillac DeVille 4.6L Stall, MIL Lamp on VIN: 1G6KD54Y21
I'm sending this in for a fellow technician here at work. We don't work on GM's, we are a Toyota dealer, try telling that to our management...lol. Customer states that the Service Engine Soon light came on and car cut off while driving. DTC's P0171 and P0174 a... Trouble codes: P0171 (Fuel trim too lean Bank 1), P0174 (Fuel trim too lean Bank 2)
2007 Cadillac DTS 4.6L Transmission VIN: 1G6KD57Y77
Wheel bearing type noise is heard on right side of car from 1 to 25 mph even after 1-2 shift. Noise is louder on left turns but still present on right turns or going straight, even when engine is off. When accelerating in reverse at any speed noise is gone com...
1988 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Stall VIN: 2GCDC14K4J
This vehicle came to us after not running for 6 years, customer got it running but running bad and developed a rod knock after loss of oil pressure, long story short replaced motor with a reman motor, found egr passages plugged up cleaned those, got the engine...
1997 Chevrolet Blazer LS 4.3L Fuel Pump, Dash lights, Power windows, blower fan VIN: 1GNDT13W2V
Hi Guys and gals, Before I take this project on I'd like to run the problem past you all. I've never seen a problem like this and don't know if I want to attempt it. What's happening is you can turn the key on (not started) and you hear the fuel pump buzz like...
1999 Chevrolet P30 7.4L Oil in coolant VIN: 5B4KP37J7Y
This is a 2000 workhorse 8.1 class A motorhome that came to us with oil in the radiator. The customer added 2 quarts of oil to the engine just before he brought it to us. We pulled the lower radiator hose and found that the radiator is loaded with engine oil. ...
2000 Chevrolet Blazer LS 4.3L Surge, Cuts out, Stall VIN: 1GNDT13W9Y
have this blazer with no 5v ref. voltage to tps,map,egr.have looked at wiring for broken wires none found.thinking of bad sensor,have unplugged sensors,still no voltage.very limited on wiring diagrams.i know this is not much info,but any ideas would be helpful... Trouble codes: P0122
2003 GMC Envoy XL SLT 4.2L Poor Fuel Economy, MIL Lamp on VIN: 1GKET16S73
Thanks in advance for any help with this one! This Envoy came in a few months ago complaining bout fuel milage. We did a complete tune up: plugs, boots, fuel filter, and cleaned the throttle plate. We also told him to run some Sea Foam in the fuel to help clea... Trouble codes: P0172 (Fuel Trim System Rich), P0495 (Cooling Fan Speed High)
2003 GMC Sierra 2500 HD 6.6L Torsion Bars VIN: 1GTHK23183
Hello techs. I need you help. Here is what I got We worked on this Duramax for an upper oil pan leak. It was mostly uneventful until we tried to install the torsion bars. I have the OTC Tool to install it properly and the left one when in fine. The right one d...
2002 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NF52E72
We do not have history with this vehicle. Towed from a local shop. No start,has spark,compression 61 lbs of fuel pressure. Spray fuel in intake and vehicle will run all day,you can turn it off and start it back up hot,but once it cools off,will not start until...
2004 Saturn Vue 2.2L No Start, MIL Lamp on VIN: 5GZCZ23D24
Hello to all we have this 2004 saturn vue towed to our shop it is beeb 2 weeks now we are trying so hard apparently we have checked everything BCM's and PCM's ground and power sources as far as we know it all there no blown fuse no bad relay we swapped them ar... Trouble codes: U2105 (Lost Comm With PCM)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Chevrolet Silverado 1500 5.3L abs module
I bled the lines at the abs module 3 times each,with my dad pushing in the pedal(not to the floor)waiting 20 seconds in between. The pedal was high and solid. That fixed the tk with the r&r abs unit. The other tk that the lines were changed on was a different ...
2003 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W82
replaced pcm and after doing security relearn,this car is now fixed. customer left car with us for 3 days so we could attempt to start it several times and have had no further issues. thanks to all that responded Trouble codes: P0101 (Maf sensor).
2007 Chevrolet Colorado LT 3.7L low pressure light on VIN: 1GCDT13E47
Thanks for the replies to all, turns out that after trying all suggestions and still having no luck. I disconnected the battery and let the memory go dead, then after restoring power went through the Tpms relearn again and system worked fine. Hope this helps s...
2008 Chevrolet Silverado 3500 HD LT 6.6L remote start VIN: 1GCJK396X8
Found a condition not set right, also found. remote is #3. will be taking to dealer, and finishing inspecting what has been posted off of here.im sure i will get it solved, thanks for all the help guys.
2004 GMC Sierra 2500 HD SLT 6.6L Unknown VIN: IGTHK231X4
Sorry for the delay in posting.The customer had a Suncoast Trans built for this truck that i installed and all is well.The company that built the trans noted several problems inside the old unit from the converter to valvebody and clutch issues.
2003 Pontiac Montana 3.4L Excessive Emissions, Stall VIN: 1GMDU23E63
It needed the ecm, summery explains it but the map voltage was read wrong at the pcm. thanks for all the help iatn. also just as a note a vacume leak will affect fuel trims at low rpm and less at high rpm, also a intake leak will result in +trim numbers not -t... Trouble codes: P0101.
2005 Pontiac Grand Prix GT 3.8L Suspension VIN: 2G2WP52245
ok Guys, thanks for the responses! Its deff the stabilizer bar. I replaced the links which helped alot, however the noise is still present. I could not get mey hands on stabilizer bar bushing, but I think that would be a good idea. I beefed up the bushings by ...
2003 Saturn Vue 3.0L Cuts out, Stall VIN: 5GZCZ53B23
well I went though everything I could think of and everything all you guys had posted me , last post was up to the ign. switch the main power relay and fuel trims while it died , well ignition switch didn't do anything even tried a new one just to be sure. Tes... Trouble codes: P1629 (Theft fuel enable -incorrect/no signal).
2004 Saturn Vue 2.2L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 5GZCZZ3D84
yes the vehicle is fixed jason from california helped us out the map sensor was bad replaced map sensor the car was still running rough but stayed running replace spark plugs yet again and car ran awesome thank you for your time it was much appreciated Trouble codes: P1599.
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