GM Automotive Technicians Technical Discussion and Fixes for Mar 25, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2001 Buick Century Limited 3.1L Hesitation, Misfire VIN: 2G4WY55J01 Hi all. This car has problems on acceleration. It has a miss/jerking and low power when accelerating. It happens most of the time, but sometimes not during the 1st minutes of a cold start. Otherwise during all accel, including on the highway. Also at times, wh... Trouble codes: P0405 (EGR sensor low), P0463 (Fuel level sensor circuit high / open), P1189 (Oil pressure switch circuit), P0300 (Random Miss)	View
	2002 Cadillac Seville SLS 4.6L MIL Lamp on car came in with a po 340, 341, we replace tthe cam sensor, we also did a crank relean, computer never losses cam signal, but after hot restart, customers saids it will be hard to start, and check engine light will come on, customer has hard time leaving the c... Trouble codes: P0340, P0341	View
	1993 Chevrolet K2500 Cheyenne 6.2L Excessive Emissions, MIL Lamp on VIN: 2GCFK29C6P Greetings GM diesel techs. This 6.2 came to us a couple of weeks ago with a misfire on the #4 cylinder which turned out to be a broken exhaust valve spring. Did a compression test on all cylinders [ok] and a leak down test on #4 cylinder to confirm that valve ...	View
	1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1GNDT13W4S ok first time on iatn. we need help badly. we have this blazer that came in would not start? we checked fuel system fuel pressure regulator failed , as well as fuel pump. also has crankcase full of gas. changed oil new filter . still not running . will fire up...	View
	1997 Chevrolet Camaro Z28 5.7L Differential VIN: 2G1FP22PXV I have a 1997 Chevy Camaro in my shop with a complaint of a noise in the rear differential. It has what appears to be a clicking sound from the diff. when down shifting. So I took it for a drive and you can barely hear it but it's there. I also noticed a littl...	View
	1998 Chevrolet K1500 Cheyenne 5.7L power door locks VIN: 2GCEK19R7W hello and thank you in advance.. i have a 98 k1500 chevy that the door locks keep locking and unlocking themselves. i have replaced the lazy accuators,relay,and keyless entry reciever i have checked all grounds,unplugged both door switches and it still does it...	View
	1999 Chevrolet Corvette 5.7L Cuts out, Stall VIN: 1G1YY32G8X first want to say thanks for taking the time to read this. ok i have a 1999 corvette auto trans that when started displays a "service column lock" message. my customer came from the dealer where they told him the recall for this problem was not covered on his ...	View
	2000 Chevrolet Express 3500 6.5L Poor Idle Quality, Surge VIN: 1GBHG32F8X "need some help techs" engine starts rocks idel up and down if i unplug opp/temp at top of pump engine will idel norm.i have my 5 volt ref on yellow and gray wire from pcm please give input i did change opp/temp with known good all grounds were clean and good ...	View
	2002 Chevrolet Trailblazer LS 4.2L no start VIN: 1GNDT13S22 Three months ago the customer jump started the vehicle backwards. Customer replaced the 125 amp fuse. We first saw the vehicle two months ago for an engine knock. We installed a used engine and the vehicle left out. Two weeks after, we towed the vehicle in for...	View
	2004 Chevrolet Silverado 1500 5.3L transfer case VIN: 1GCEK19T84 Customer brought his truck in because it was making noise, traced problem to blown transfer case. Installed reman transfer case & new encoder motor. The problem is it won't lock into 4W high, the light will flash & then go right into auto 4wd, it works like it...	View
	2005 Chevrolet Silverado 1500 LS 5.3L MIL Lamp on VIN: 2GCEK13T45 pull codes po332 knock sensors. removed intake to inspect wires and sensors. found rear knock sensor very rusty and broken apart. removed and replace 2 sensors / harness / intake gaskets. cleared codes gave back to customer to drive. returned next day with a p... Trouble codes: P0327	View
	2000 Pontiac Grand Am SE 2.4L cooling system VIN: 1G2NF52T1Y hello,and thanks in advance for any input.this grand am was brought in 1 month ago for an ongoing overheating problem. at the time, cooling systen was operating properly,we tested for hc's,pressure tested,road tested,and sent it on its way.we were hoping the p...	View
	2001 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB12F02 Hello and thanks in advance for everyones help. I have a Sunfire with a P0327 code stored - knock sensor low input. Was told that there is a bulletin for fix but AllData shows no such code exists. I am confused. Any help would be appreciated. Trouble codes: P0327 (Knock sensor low input)	View
	2005 Saturn Ion-1 2.2L lack of power VIN: 1G8AF54F15 Car was towed in with symptom of no power. Customer stated that the car would idle good but bog down when the accelerator was pressed, and didn't have enough power to pull itself. Scanned and found the codes listed. I took it out for a test drive and the car r... Trouble codes: P0101 (MAF out of range), P0106 (MAP or BARO out of range), P0171 (System too lean), P0300 (Random cylinder misfire), P0506 (Idle Control System RPM too low), P0068 (MAP/MAF-Throttle Position Airflow Correlation)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Chevrolet C1500 Cheyenne 4.3L ABS mod., master cyl. VIN: 1GCEC14W5T Hey guys!!! I have decided to pull abs fuse and drive for awhile. I feel it will help to know if it is an abs prob. or an hydrolic problem. I got great responces that ranged from master cylinder, oem rubber lines, leaking wheel cyls., binding calipers, dump va...	12
	2000 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22G3Y customer decided to go to the dealer for repairs or live with the check engine light on. thanks for all the reply's. cant say my feelings are hurt by having this car leave unfixed, it had too much aftermarket bs anyway. Trouble codes: P0141, P0161.	9
	2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E81 thanks to all that replied the problem is the ignition switched we replaced the switch and sent vehicle to chevy dealer to program car now starts every time thanks again	17
	2002 Chevrolet Corvette Z06 5.7L Column Lock VIN: 1G1YY12S72 First, thanks a lot for all of the help. I got a lot of replies. Many of them told me about a recall, I checked with the dealer and it had already been done. Apparently these cars also have a problem with the BCM getting wet, no problem found. Several people t...	11
	2003 Chevrolet Trailblazer North Face 4.2L T-Case, Diff, Trans??? VIN: 1GNET16S83 Hi everyone, Thanks to all replied! Many referred to the Tire size difference we had as being the most likely culprit. And guess what? We put four new Tires on this Truck and the trouble is GONE!!! Thank-you! Mike.	6
	2004 Chevrolet Express 3500 LS 6.0L front end shake VIN: 1GAHG39UX4 Thank's to everyone who replied, I turned rotors and problem solved. Customer does not have money to replace rotors so we will see how long they last.	18
	2005 Chevrolet Suburban 1500 LS 5.3L 4WD Shifting VIN: 1GNFK16Z65 We never had the problem occur for us but in going through all the related tech info, IATN and Identifix posts we determined that the module is in essence stupid. Depending on what the switch is commanding and what the module is commanding and what the sensor...	8
	1995 Geo Prizm LSi 1.8L No Start VIN: 1Y1SK5286S Thanks to all who responded. Ended up being a faulty reman distributor. Trouble codes: 14 (Ignition signal).	5
	2005 GMC Envoy SLE 4.2L misfire VIN: 1GKDT13S25 the first time i had the compression checked by an employee and told me it was good. After dooing all the other tests and after reading all your replies, idecided to double check the compression. Turned out i had a 70% cyl leakage at cyl #2 and air was comin...	13
	1991 Oldsmobile Cutlass Supreme 3.1L all electrical VIN: 1G3WH54T2M first time using IATN ...IGNITION MODULE.,THANKS	12
	2002 Pontiac Bonneville SLE 3.8L No Start VIN: 1G2HY54K52 Thanks to all who replied, but the problem with this car was the gas was either bad or contaminated. After checking various things I decided to remove the fuel line at the injectors and cycle the key, to have fuel pour into a glass jar. After looking at it and...	9

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