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Prev Professional Automotive Repair Technical Discussions for August 31, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW52K7X
please help evap problems, had code po442 and repaired bad wire and canister vent solenoid (also noticed fuel in canister when unhooked lines to check for contamination)see repair history. has anyone seen the fuel in canister and whats it mean (fuel in caniste... Trouble codes: P0442, P0440
2001 Cadillac Seville SLS 4.6L piston knock/carbon VIN: 1G6KS54Y11
Car seems to have the typical carbon/piston knock when engine gets warm. Archives tell there are newly designed pistons, and that it can be carbon build up on the upper rings. Iam not a fan of the top end cleaner. I have concerns of it damaging the cat and O2'...
2003 Cadillac CTS Luxury 3.2L starter VIN: 1G6DM57N93
Car was towed in with all electrical working fine but no crank no start. Car would not take a jump. Battery tested at 14.3. We jumped the starter relay out with relay by-pass and car started. We installed a new starter relay and same condition. The power in si...
2003 Cadillac Escalade 6.0L air ride control VIN: 1GYEK63NO3
This is for gm gurus o3 cadillac escalade rear suspension is very stift like no shocks.This escalade has rear air shocks only,front shocks looks regular shocks with electrical conection on top for dumping solenoid.rear shocks were replaced at another shop for ...
2004 Cadillac CTS 3.6L key VIN: 1G6DM57724
Car came in and had a check engine light on. Went to use Solus Snap On scanner to check for codes, miread the vin for engine and used the wrong key card, could not communicate with ecm. Realized what I had done and changed to correct key card. Could communicat...
1997 Chevrolet K1500 5.0L No Start, Stall VIN: 2GCEK19M4V
This is my personal truck. I was going down the road at a cruise and engine just died like it lost spark. It restarted after a few hours. I ran it all day today and have not been able to get it to die again. Cam and crank signals look good. Cam retard is +6 at... Trouble codes: 1345 (cam/crank correlation)
2000 Chevrolet C3500 7.4L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1GBKC34J6Y
I can't seem to get this 1 ton fixed and it's a simple enough system- I guess I'm just missing something here. Had it in a couple of weeks ago and replaced fuel pump. Fixed it til today. Came in and would barely stay running. Was blowing smoke out exhaust from...
2001 Chevrolet S10 4.3L MIL Lamp on VIN: 1GNCS13W91
Vehicle shows hard misfire. Came in with code p0304, clear code and goes to p0300. Computer scan data shows hard misfire cylinder #4. Vehicle exhibits no symptoms and is hitting on all cylinders. MIL is flashing. Code is false, no misfire is occuring. What c... Trouble codes: P0304, P0300
2001 Chevrolet Silverado 3500 6.6L No Start VIN: 1GBJK39111
Having hard time with this Duramax. Truck came in for hard start and now is a no start. After doing the following tests checking fuel return flow truck will start during the process. After a test drive it will go back to a crank/no start. I have followed allda... Trouble codes: P0094 (Small fuel leak)
2004 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13S94
I have a 2004 chevy trailblazer with the 4.2L I have tested everything and have come to no conclusions. Customer came in with the complaint of MIL on and loud fan. Pulled codes and came up with a PO526 Fan clutch speed circuit. Put a fan clutch on it(ACdelco) ... Trouble codes: P0526
2004 Chevrolet Trailblazer EXT LT 5.3L MIL Lamp on VIN: 1GNET16P74
Hi & as usual Thanks in advance for your time. In the past 6-8 mos maybe a year this DTC PO483 has set 3 times. I cleared it each time & it took a long time to reset. Now trying diagnosis according to All-data Trouble Tree Chart. I can activate the Electric Fa... Trouble codes: P0483
2004 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 3G1JC52F34
I work on these vehicles often but can not figure this one out.Freeze frame shows ST0 LT-3 88kph tps 12%5.8gm/sec other freeze data ST-2 LT-3 84kph tps 20% 24.63gm/sec Tested fuel pressure 60psi oil not contaminated even changed oil, air filter new and did rep... Trouble codes: P1138 (H02s B1 S2 rich fuel or high volts), P0138 (02 signal high bank1 sensor2)
2005 Chevrolet Cobalt SS 2.0L clutch leaking VIN: 1G1AP14P55
came from body shop, body shop had another shop put clutch in the vehicle, replaced clutch master cyl & clutch slave cyl. Slave cyl is leaking we replaced the slave cyl and bled the system, has good strong pedal. then it goes away and leaks fluid this makes 3...
1992 GMC C2500 Sierra 5.7L needle bounces VIN: 1GTFC24K0N
Truck has been garaged and is in great shape. Came in with a long list of maint items. The one thing keeping us from letting the customer have it, is the speedometer. When driving at random speeds, the speedometer reads fine until the cruise is engaged. Then t...
1997 GMC C2500 Sierra SL 5.7L Power Steering
Truck came in for power steering leak, pressure line and pump were replaced and EVO resealed w/ new O-rings, not eliminated. Truck came back week and a half later with no power steering operation. Installed the EVO delete kit, but to no avail. Dont have a PS p...
2004 GMC Envoy XUV SLT 5.3L Rear Power Window And Lift Gate VIN: 1GKET12S64
Hi guys have a rear lift gate power window that wont go back up and the power gate wont open.checked all the wiring,relays fuses etc.the power window can be operated with the key fob,door lock cylinder or a switch at the overhead display.has two power lift gat...
2008 GMC Acadia SLT 3.6L Audio VIN: 21GTEK45E8
There is no Audio from any source within the vehicle No radio No audible turnsignal click clack No Door Chime or seat belt sound On-star can not be heard. Radio Changes stations and accepts cd's The display can be seen and adjusted Tis 2 Web does not show a ...
2004 Saturn Vue 3.5L MIL Lamp on VIN: 5GZCZ63414
Towed to shop at night with note,two yellow lights on and no power,battery dead left lights morning started up ran fine, no codes or freeze (most likely because battery died)took on highway for 20 mile run no problem.took home that night almost made it... Trouble codes: U0107 (Lost communication with throttle actuator module)

Fixes & Summaries for GM
Fix/Summary Answers
2000 Cadillac Catera 3.0L Mechanical VIN: WO6VR54R0Y
sorry it took me so long to get back to you all i told him i did not want to do the job its not worth my time and his money so he is going to try to sell it or run it to the grund what evre comes first thank you all for your help
1994 Chevrolet K1500 5.7L Excessive Emissions, Hesitation, Cuts out, Poor Fuel Economy VIN: 2GCEK19K6R
Well this one has been repaired. We repaired a open curcuit in the wiring for the engine temp for computer this put the temp reading in range on the scanner. As far as the timing reading we replaced the distributor with a recon unit, And the timing fell into t...
1998 Chevrolet Corvette 5.7L Temp Guage VIN: 1G1YY22G7W
hello everybody, thank you for all the responses... so it seems only on hotter days does the temp go up 3/4 of the way, and on the cooler days it only goes up to about half way. so no repairing was done and customer is happy thank again
1999 Chevrolet Corvette 5.7L long crank time VIN: 1G1YY32G2X
sorry it took so long to respond back but i wanted to make sure that this car was fixed.well after replacing the fuel pump,fuel filter,fuel regulator,removing the injector rail to see if the fuel injectors were leaking down,they was not. So i put every thing b... Trouble codes: P157, P0300, P410, P1637.
2001 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on, Engine smoke VIN: 1GBHG31R31
Got Humbled on this one! -- Thanks to all that replied, Mechanics`s are the best people on earth! - Any way, the end of the story is - After still doing more work (testing/grounds/sensor simulation)- The computer was bad - what it told my scanner is not what i... Trouble codes: P0300 (Random misfire).
2003 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Stall, MIL Lamp on VIN: 1GNDT13S23
I cleaned the throttle body out and did an idle relearn and the idle problem is now fixed. As far as the coolinf fan issue for some reason the customer did not want to go any farther. Thank you for your help. Trouble codes: 1481 (Cooling fan speed sensor).
2006 Chevrolet Express 2500 4.8L MIL Lamp on VIN: 1GCGG25V46
Installed PCM and drove 100 miles with no return of codes..thanks I am always worried about a code setting like map when i have an engine that stalls. Usually the code is from no vacuum due to not running. like a false code. Trouble codes: P0106, P0122, P0300.
2005 GMC Sierra 3500 SLT 6.6L Abs VIN: 1GTHK33265
Thanks to all who replied to my request, I received quality advice from everyone. After double and tripple checking all our tests and results I read a tsb on alldata for connector and wiring issues pertaining to this vehicle. According to wiring diagram the...
1995 Oldsmobile 88 Royale 3.8L MIL Lamp on VIN: 1G3HN52K7S
This car runs fine except twice you could hear it stumble when it flags the code(p0342). When it flags the code there is no glitch in lab scope waveform. Thanks for looking.I dont want to close this but I have no respond icon so I am putting my response here. ... Trouble codes: P0342 (Cam Sensor Circuit).
1999 Oldsmobile Intrigue GL 3.5L No Start, Cuts out VIN: 1G3WX52H3X
This one was a real ballbuster. After checking everthing twice and more, I decided to check every inch of the harness for the crank sensors. What I found was near cyl 6 where the injector and ignition harnesses ran with the crank sensor harness, about 3 inch... Trouble codes: P0135, P0138.
1994 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52L0R
After trying 3 different valves, I decided to search the postings again with a wider search and found 2 posts with similar problem. I read the reponses and found one that said the scope pattern for the PCM command of the EGR valve sould be a square wave form.... Trouble codes: P1406 (EGR pintle position error).
2000 Pontiac Montana 3.4L coolant leak VIN: 1GMDX03E6Y
I would like to thank everyone who replied and this car is already fixed. I did what almost everyone suggested and replaced the timing cover gasket and the leak went away. Never thought that it could leak from the timing cover but you guys experienced helped ...
2002 Pontiac Sunfire GT 2.4L Poor Idle Quality VIN: 3G2JD12T22
Thanks for all the help. For some reason on Friday I didn't even realize the tps was supposed to be 0%. Don't try to diagnose stuff overtime at the end of a long week. I tried unplugging the tps as suggested, and it did drop to 0%. I thought about it being ...
2006 Pontiac G6 2.4L MIL Lamp on, VIN: 1G2ZF55B76
Came back yesterday with same codes , the only ting the customer added was she had a cell phone plugged in and the problem started when she unplugged it, have not got it to act up doing the same so far??? Trouble codes: B1000 (b1001-), B1001 (u0073-), U0073 (u2103-), U2103 (u2107-), U2107 (u2109-), U2109.
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