GM Automotive Technicians Technical Discussion and Fixes for Feb 14, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Century Special 3.1L wot VIN: 1G4AG55M7S The Customer came with the car and hose, I drove it in the bay. Pulled the Brake Booster hose to access the line at the gear, filled up fluid, reattached the Booster hose and started up the car, it went to wide open throttle with a rev-limiter stile surge. I b... Trouble codes: P1404 (egr 2), P1405 (egr 3)	View
	1999 Buick Regal GS 3.8L starter VIN: 2G4WF5218X After a quick stop at the store vehicle would not start. When key is turned to "run" check engine light intermittently flickers, all other dash lights are steady. A buzzing can be heard from relay box. Buzzing appears to be coming from cooling fan relays. When...	View
	2001 Cadillac DeVille 4.6L Starting VIN: 1G6KD54Y51 This car came into the shop with an intermittent no crank... I hooked up a scan tool to this vehicle and pulled a p0335, p0340, p0385, p0615, p0741, and a p1860. I have only been able to get the vehicle to act up one time but it was only about a 3 sec. delay a...	View
	1995 Chevrolet Tahoe 5.7L Poor Idle Quality VIN: 3GNEK18K6S this engine will miss or stumble at idle with the transmission in drive. the engine has to be hot. it will happen on average about once every couple of minutes. it feels like a secondary igintion miss but im not sure it is an ignition problem. i can see no pro...	View
	1996 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality VIN: 2G1WX1ZX0T I'm sure I can't see the forest for the trees, but here it goes. This car runs great, except for an occasional surge at idle. I can get it to surge about every time I start it, and let it idle about 45 seconds it will surge. Sometimes it will surge bad enough ...	View
	1997 Chevrolet Cavalier LS 2.2L Poor Idle Quality VIN: 1G1JF5247V This type car is usually pretty simple but I sewem to have an odball problem here. Car came in 2 weeks ago with complaint of fuel smell. Found number 2 injector and pressure regulator was leaking replace both an problem seemed ok. Brought car back 2 weeks late... Trouble codes: 300 (random misfire history code)	View
	1999 Chevrolet Blazer 4.3L timing chain VIN: 1GNDT13WGX thanks for your time t read this and any suggestions are greatly appreciated. my bosses 4.3 blazer runs smooth and fine its getting sluggish. he wants to check the timing chain in it but wont pull the cover to see. according to alldata this engibne has a chain...	View
	2000 Chevrolet Silverado 1500 5.3L steering box and/or steering pump VIN: 1GCEK19T9Y Customer had 100 miles away whe he lost power steering. Said he looked under hood, belt was on, no leakage apparant. When I got it, after he drove the 100 miles with no powe steerig, the return hose was off and no fluid in system. Put a reman AC Delco sreering...	View
	2002 Chevrolet Express 2500 5.7L ABS Readings VIN: 1GCGG25R72 Here's a good one for you GM tech's... Vehicle came in with intermittent low speed ABS activation on left front wheel. Thought at first maybe the speed sensor had some rust buildup on the mounting base but decided to run a value scan with our Solis first, to ...	View
	1998 GMC C1500 Sierra SL 5.7L fuel leak VIN: 2GTEC19R8W fuel leak at cpi plug in. found fuel at plug in while doing intake gaskets. cleaned out test drove for one month there is fuel back in there. has anybody seen any common problems with o-ring or injectors. thank in advance.	View
	1999 GMC Sierra 1500 SL 4.8L Fuel gauge VIN: 1GTEC14VXX The fuel gauge is erratic at all times. Cycling the ignition may or may not provide a response, as it can remain on empty for several cycles. I was able to get a 12v reading at the tank connector, but the customer is not willing to pay for dashboard removal fo...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Park Avenue 3.8L Engine VIN: 1G4CW52K0V I pulled apart the timing cover one last time for a really close inspection. The crankshaft timing sprocket was cracked causing the chain to run off center. It seems the crankshaft key-way was pushed back when I installed the crank pulley. I missed by about 1/...	9
	2002 Buick Century Custom 3.1L dash lights VIN: 2G4WS52J32 Hi all ok I am not sure why this fixed it but here gos I got the car back in monday and the first thing I did was check for codes found none in the ecm so I checked in the brake or abs system and I found a code for the selinods cycling to long sorry I dont rem...	9
	1997 Cadillac DeVille 4.6L airbag VIN: 1G6KD54Y5V Well this one is fixed Thanks to all who responded many of you said to check the sir coil or clock spring which after disarming the airbags we did remove and Test and found this to have a broken connection we replaced and reassembled and and problem is gone Th...	9
	1996 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 1GCEC19R1T Thanks guys, it was the distributor cap. That is what most of you that responded told me. I learned that you cannot judge a book or a cap by its cover. The cap looks great from the inside too. What stumped me was the customer's description of it just dying goi... Trouble codes: P1345 (Disagreement between cam and crank sensor).	43
	1999 Chevrolet Cavalier 2.2L pulleys VIN: 1G1JC5244X Thanks to everyone who replied. The problem was fixed by replacing the tensioner and belt. IATN is great! Keep up the good work everyone, hope I can return the favor in the near future.	26
	2001 Chevrolet Malibu LS 3.1L Radiator Fans VIN: 1G1NE52J01 Well, I think I have repaired this car, at least for now. I had already replaced the thermostat, so that was taken care of. From some of your replies, I found out the fans will run after started untill a certian speed of driving has occured. However these woul...	14
	2001 Chevrolet Impala 3.8L MIL Lamp on VIN: 1G1W567KE1 Bingo a new thermostat and clearing the P0128 code fixed the fan coming on after key off/and thermostat problem. Thw fans wer noisy and we replaced them-hint-remove the air box for axcess and there is a push in retainer under the drivers side fan that has an a... Trouble codes: P0128.	4
	2002 Chevrolet Trailblazer LS 4.2L t-case VIN: 1GNDT13S12 Well this one is to bed... A reflash corrected the 4hi and awd engagement...go figure?? After a lot of reading on this 236, stumbled across it has adaptive learn for the clutch pack, well the original unit was wasted in that area and fork had been traveling pa...	4
	2002 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52JX2 i thought a had mentioned i did scan for codes with red brick, found nothing. all those who said theft system i think were correct. although i cannot prove, i believe a weak battery was allowing the car to crank, it was sufficiently draining the pcm's memory w...	14
	2004 Chevrolet Malibu 2.2L fuel pump The problem was ignitiopn switch,i replaced and problem gone.What i was trying to do was bypass ignition theft system but was not sure if remote starter needes the theft system working correctly to work -i think it does, so just making the car run was good eno...	7

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