GM Automotive Technicians Technical Discussion and Fixes for Apr 12, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Buick Electra Limited 3.8L Surge, Cuts out, Stall, Lack of power VIN: 1G4CW51C1J Replaced fuel filter/ unplugged pressure regulator and drove/ inspected (1) spark plug (ok) unplugged maf and drove- no change in power// ran a tank of fuel through with injector cleaner & water inhibitor// symptoms did not change.. (( runs perfect with plenty...	View
	1995 Buick Park Avenue 3.8L Stall VIN: 1G4CW52K4S This car has me stumped. This 95 Park Avenue had a new motor put in at 141k miles and the customer had no issues with it until recently. It was origonally a 3800 Series I engine, and a Series II engine was installed in the car. As stated, the customer had no... Trouble codes: P0325 (Ign system problem Elec SPark Control ESC Failure), P0705 (PRNDL Switch Failure)	View
	1995 Buick Park Avenue 3.8L No 2nd Or 3rd Gear VIN: 1G4CW52K6S Transmission will not shift into 2nd or 3rd, even if shifted manually, but will eventually go into 4th (1st & rev solid). 7 fault codes logged in current codes, no history codes. P0101 (maf), p0501 (vss), p0703 (brk sw), p0705 (range sw), p0755 (solenoid b), p...	View
	1998 Cadillac DeVille d'Elegance 4.6L Front end VIN: 1G6KE54Y0W This vehicle will start to shudder or vibrate when under accel only. It begins at around 40-45 and feels more side to side then. At higher speeds, and under accel, it will shake the whole car. As soon as throttle is released, the vibration goes away. In the pa...	View
	1998 Cadillac DeVille 4.6L Level Ride System VIN: 1G6KD54Y8W Howdy everone! Last june I replaced the air shocks and compressor on this caddy, last month the owner called and said it was sagging to the ground overnight. I told him that the system shouldnt be able to go lower that the ride height so I needed to check it. ...	View
	1999 Chevrolet S10 4.3L brake pedal VIN: 1GCDT19X8X This vehicle is a co workers vehicle that we cannot seem to be able to duplicate the issues. For starters, about 4 months ago, the complaint was the ABS would kick in at random. Not like slow speed activation, because speed was not a factor. It would activate ...	View
	2001 Chevrolet Silverado 3500 6.6L oil cooler? VIN: 1GCHK29151 I'm needing a duramax techs help on this one. This motor has a coolant leak at the left rear of the motor, mainly when the motor is cold I pressure tested the system but had to let the truck sit over night to develop a slow drip on the rear left of the motor, ...	View
	2003 Chevrolet Tahoe Z71 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GNEK13Z83 We have this vehicle in that a dealership diagnosed a faulty cat on this vehicle. We replaced the cat with oe, cleared codes and then it was running poorly. My tech replaced the b2s1 with an oe part. We are having a problem with b2 running lean. ltft is at 25,... Trouble codes: P0174 (Bank 2 sensor 1 lean), P0300	View
	2005 Chevrolet Venture LS 3.4L MIL Lamp on VIN: 1GNDX33E05 hi, 2nd time this van came here for this code, p0131 o2 voltage low, can only get this to act up on roadtest if you are into the throttle 70% or above,check o2 wiring, fuel pressure good 50psi, replaced pluged fuel filter,tried new o2 sensor, going to try know... Trouble codes: P0131	View
	2005 Chevrolet Silverado 2500 HD 6.0L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GCHC29U15 This vehicle was dropped in my lap. Customer stated that it "all of a sudden" started running rough. Went through the truck and found that the converters were plugged (5 psi of back pressure). Customer had cats replaced at local muffler shop, but they told him...	View
	2006 Chevrolet Impala SS 5.3L No Start, Guages/ door locks VIN: 2G1WD58CX6 Sorry friends, this is going to be a long one! Original verified complaint was door locks locking & unlocking by themselves, and tranmission shifting rough while driving. I discovered that engine running in neutral, KOEO in neutral, or key in accesory position... Trouble codes: U0155 (History code only), B1000 (History code only), U0073 (u0001-), U0001 (testing and results)	View
	2008 Chevrolet Cobalt LT 2.2L power steering/HVAC VIN: 1G1AL58F58 Car came in with the 10 amp hvac and ip ignition fuse in the center console blown, customer installed new 10 amp and it blew again, then the power steering failed and he brought me the car. I found the 20 amp fuse in the engine bay blown and replaced it, repla...	View
	1997 GMC Jimmy SLE 4.3L Compressor VIN: 1GKDT13W8V Ok this problem child was drop off for the a/c not working I started with the basics a system charge found to be 8oz low and checked all fuses.Hooked up my scanner and the a/c request set to no.I can take 12 volts and manually make the compressor run.I checked...	View
	1993 Oldsmobile 88 Royale LS 3.8L Battery VIN: 1G3HY53L3P Hi everybody. We have a 1993 Oldsmobile 88 3.8L in that customer states that when the car is left alone for 3-4 days the battery is dead. I have my meter in series with the battery to see exactly what the draw is and it is 16-19mA. This does not seem excessive...	View
	2010 Other GM H3 3700CC Transfercase VIN: ADMDN13E18 I have a problem with this vehicle, the "serv 4 wd" is appear in a combination meter, before the message appear, i try to pull out the junction blok on the left engine compartment, and i istalled again in a few minutes, but when i try to on the ignition, the j...	View
	2003 Pontiac Vibe 1.8L Windows VIN: 5Y2SL62873 Have the strangest problem i'v seen in my 15 year career, have this vibe that will always surge or buck when you are at or above 60 mph and only when you roll a window down as soon as you roll the window up it quits immediately like you turned a switch off. Fr...	View
	2004 Pontiac Bonneville SLE 3.8L MIL Lamp on VIN: 1G2HZ54143 Sets p0401 EGR flow on a drive cycle. enging is supercharged and tried a good EGR valve, MAP sensor and tried latest programing. Flow is good thru valve and can be controlled correctly by Tech 2. Positions look correct also. Strange Trouble codes: P0401	View
	2007 Saturn Vue Green Line 2.4L B.A.S. starter/generator VIN: 5GZCZ33ZX7 Towed in with a dead vehicle battery, only about 1 yr old so, we charged it up overnight. The battery tested good with flying colors. Re-installed it in vehicle and tested electrical system. The alternator failed. No problem (right?) Replaced it with a new oem...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Park Avenue Ultra 3.8L Stall, MIL Lamp on VIN: 1G3456789X Ok put a crank sensor in it for the dieing issue died 2 more times after the car was returned to the customer the first time. car hasnt been back as of yet. as for the rpm issue was talking to my buddy who is a gm tech and first words out of his mouth with o... Trouble codes: P0336.	11
	1964 Chevrolet Corvair 2.7L wont rev over 1,500 VIN: 40667W2711 Took carburetor to a specialty rebuilder and they ordered rebuild kit and went through the carburetor. All seems ok now. There was quite a few things they found that needed repaired to bring it back to working order. As I said nothing was known about car, repa...	32

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