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Prev Professional Automotive Repair Technical Discussions for January 12, 2012
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue 3.8L intake exploded VIN: 1G4CW52K8V
This vehicle was driven out of shop 1 month ago and parked.Went to bring inside and battery was dead.Pushed into shop and put on charger.After 30 minutes went to start engine to move vehicle so I could work on windows.As soon as I turned the key to crank the u...
1997 Chevrolet P30 7.4L MIL Lamp on VIN: 1GBKP37N3V
This is a P30 chassis with a Winnebago on top. It came in with the MIL on and a complaint of no communication with the PCM from another shop. So far we found no power or ground wires at the DLC (we added power and ground to the DLC) Still no communication. The...
2002 Chevrolet S10 4.3L No Start, Poor Idle Quality VIN: 1GCCS14W92
This problem is a first for me. Truck was towed in after having milk poured into fuel tank. Customer tried to syphn out all the contaminated fuel and filled up with premium. We get it in and decide to empty tank thinking we might need to drop the fuel tank. Th...
2002 Chevrolet Tahoe LS 5.3L Mechanical VIN: 1GNEK13T22
hello i have a 2002 taho 5.3 thats making a lifter noise when cold and it has random misfire code po 300 stored in freeze frame the intake gaskets havent been changed yet with the tealgreen ones i drove it around for and hour with no problems there are no lean...
2004 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC12F14
Vehicle first arrived at shop with a customer complaining of long start and buzzing noise in fuse bos undr hood, duplicated concern and found fuel pump relay humming removed and replaced and vehicle was fine for two or three days then occured again. fuel press...
2004 Chevrolet Suburban 1500 LS 5.3L tcase-ftdf VIN: 3GNFK16Z54
we fighting another one. we have a 4x4 suburban that when you put it into 4x4 lock it will create a moning noise.(like a wheel bearing type noise). (not growl) this noise will go away as soon as you press auto 4x4. and will not make noise in 2 wheel drive. all...
2008 Chevrolet Cobalt LT 2.2L cruise inop
hey all, i have a wierd one today, its an 08 cobalt 49k miles, cruise control is inop, hooked up scanner found codes for brake pedal position signal stuck high, computer thinks brake is always depressed there fore doesnt allow the cruise control to activate. f...
2004 GMC Envoy SLE 4.2L brakes VIN: 1GKDT13SX4
During test drive noticed that the abs was engaging every time you would use the brakes, light or hard. The abs light came on, so I went back to the shop and scaned it. It has a abs code for rear wheel sensor. The sensor is on the tail shaft of the transfercas...
2006 GMC Savana 3500 6.0L MIL Lamp on VIN: 1GDHG31U16
Hey fellas, This particular truck sets above codes for o2 sensors heater resistance. we have replaced all 4( for heater codes)o2 sensors and ecm just over a year ago for same problem. mitchells says to watch for amp reading of .25-1.375 on scan tool, have modi... Trouble codes: P0053 (B1s1 heater resistance), P0059 (B2s1 heater resistance)
2008 GMC Envoy Denali 5.3L Hesitation VIN: 1GKET63M78
Truck was brought in for lack of power. After road test it seems to have a flat spot at times. Not always. No codes found. Feels like bad cats when it happens but if you give it more gas power will come back. Checked fuel pressure ok, checked back pressure 1...
2001 Oldsmobile Aurora 3.5L Windows VIN: 1G3GR64H01
Running out of options need a little help here hope some one has seen this before. This aurora has no window or door lock operation but when acting up the drivers window will try to roll down very jerky like bad ground or power. If key is cycled a couple of ti...
2006 Pontiac G6 2.4L Dash Temp Gauge, compressor, electric cooling fans
***Please do not respond to this help request. Vehicle has been fixed. Simply entering data into the knowledge base.*** Customer complained of temperature gauge not working. Verified problem. Temperature gauge performs self test sweep upon start up then remai...
2002 Saturn Vue 3.0L Drive-axles VIN: 5GZCZ63B72
I need some imput from all the Saturn techs out there. This Vue will lock the rear wheels up at times, speed doesn't matter. When this happens you can back the vehicle up, but not move forward. It will also happen to only the left rear at times. I disabled the...
2003 Saturn Vue 3.0L canmshaft VIN: 5GZCZ53B23
Any help on how to identify the difference between intake and exhaust camshafts on this 2003 Saturn Vue 3.0 motor built by Opal.. The camshafts all (4) have the same billet number [...]. Other numbers on the cams are Cam 1( GC33 + GM 35 ) , Cam 2 ( GC34 + ...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Chevrolet C2500 5.7L Rear Brakes VIN: 1GBGC24R8X
Thanks for the advise, I installed new Shoes and Drums blead the brks and did a fine adj. I think though the rt side ebrake cable is not relesing 100%. So we are watching it for now to determin if we should replace it. Thanks again for the posts.
2004 Chevrolet Trailblazer LS 4.2L air injection VIN: 1GNDS13S94
great responses from so many. most stated common failure with control valve, some stated to inspect for water in air pump assembly. the air pump and relay at the air pump always operated, no water or debris was located in air hoses at air pump assembly. when a...
2005 Chevrolet Suburban 1500 5.3L No Start, long crank cold VIN: 1GCEK14X65
First off sory this closing took so long. Second bad fuel was in the end what was wrong with this vehicle. I had taken fuel samples from this vehicle and they showed none of the common signs of bad fuel only after I had tested and retested everything and found...
2006 Chevrolet Trailblazer LT 5.3L front axle VIN: 1GNET13M16
I checked the mechanical portion of the acuator and it was working smoothly. When I ran throught the test for this code on Mitchell there was no other option but the acuator being bad. This was not the case. My best guess is the fourth wire on this acuato...
2010 Chevrolet Equinox LT 2.4L MIL Lamp on VIN: 2CNALDEW9A
The crankcase smelled like gas. I recommended the fuel pump but the customer took it back for warranty. Trouble codes: P0172.
1993 GMC G2500 Vandura 5.7L Excessive Emissions VIN: 1GDEG25KXP
Gentlemen, thank you all so much for your input. Sad to say, I couldn't get this beast to pass. After changing the coolant temp sensor, thermostat, dist cap and rotor, the single wire O2 sensor (only has one sensor), it didn't really change the exhaust readi...
2004 GMC Yukon Denali 6.0L 2-3 shift VIN: 1GKEK63UX4
Thanks to all, most were correct with the 3-4 internals. Replaced the transmission with a Jasper (as we have been an installer for 8 years) and all is well.
2001 Pontiac Grand Prix GTP 3.8L No Start, Stall VIN: 1G2WR52181
Well I got another sensor from NAPA, inspected MAF screem, air intake duct etc. all seem fine. I left the engine cover off since the problem seem to occur hot and customer is happy with my efforts and explanation . I've never had this issue on other makes or m... Trouble codes: P0102.
2004 Pontiac Grand Am SE1 3.4L pcm VIN: 1G2NF52E64
This one is fixed. The wiring for the cam sensor was partially shorted under the power steering pump. The 12v reference was pulled done to 10v during cranking so the PCM would only command crank for about 300ms. The car had multiple problems unrelated to ...
2009 Pontiac G5 2.2L fuel pump VIN: 1G2AS58H39
You guys are amazing!! Thanks for the help. It turned out that the bodyshop painted the parcel shelf, then re-installed the grounds. The paint prevented a good ground. We cleaned & assembled the grounds & everything is working as designed!! Thanks again Dar...
1998 Saturn SC2 1.9L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G8ZH1272W
Thanks for all the replies. We checked all the injectors for resistance and they were all within a few ohms of each other. Checked the wiring and could find nothing. We ended up replacing the coolant sensor. This was the winning fix. Couldn't see anything wron... Trouble codes: P0302.
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