GM Automotive Technicians Technical Discussion and Fixes for Jun 15, 2007 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Century Limited 3.1L readiness monitors VIN: 2G4WY52M5W this car runs fine, it came in with an egr code but we cleaned out the ports and replaced the egr valve. next we cleared the codes and took the car on a drive cycle to make it ready for inspection. The problem now is that the Cat, Evap, Egr, and HO2s monitors ...	View
	2001 Buick Regal LS 3.8L starting VIN: 2G4WB52K2Y vehicle was brought in with abs light and ck engine light flashing, and no start replaced alternator,serpentine belt and battery rechecked starting and charging system every thing checked out good,vehicle set outside for 3 to 4 hours,when customer tried to sta...	View
	1989 Chevrolet Corvette 5.7L No Start, Poor Idle Quality VIN: 1G1YY3185K Car brought in after a tune up for lack of power could not acclerate over 2,220 rpms. Tested both coil and ignition control module both failed and we replaced both. Hard to restart when hot. Checked timing and it was off by an excessive amount. We then replace...	View
	1990 Chevrolet Lumina 2.5L Cuts out, Stall VIN: 2G1WL54R8L Hello fellow techs, I have this 90 Lumina thats is starting to drive me crazy. I have had this car here for three days now with the customer compalining of a stalling problem. I have put over 50miles on this car and have not got it to stall out, after sitting ... Trouble codes: 44 (lean exhaust indicated.)	View
	1991 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, rough VIN: 2GTGK29N6M Hello all. This truck has an extremely rough idle when first started. Today the temp at startup was 93 degrees. KOEO readings- Block learn was 122, baro 29.3,base Pulse width 18.2 On startup, KOER readings- Base pulse width 1.6,coolant temp 93 degrees, map 9.5...	View
	1994 Chevrolet G30 Chevy Van 6.5L No Start VIN: 1GCGG3516R this van has problem of no start after run for 30 min or more and then sitting for 30 min. Whe you cool down injection pump with cold water, starts. sit overnight and starts fine. Checking with others, it looks like injection pump is problem. Question is, I ha...	View
	1998 Chevrolet Cavalier 2.2L abs light VIN: 1G1JC1243W I have an intermittant abs light with no codes. I've cleaned the main ground which was bad. There are no codes in any other system.The low coolant light did not work before I cleaned the main ground as others have said. I was wondering if anyone has dealt with...	View
	1998 Chevrolet Express 1500 5.7L drivers window VIN: 1GBF15R9W1 drivers window intermittently when put all the way down, will not go back up.it has had 2 remanufactured motors and a new drivers switch.after the 2nd motor, i tested the switch more carefully and found that when put all the way down the voltage to the motor d...	View
	1999 Chevrolet Malibu 2.4L No Start, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1ND52T1X Thanks for all who read, this car is a headache car, first came in no start, customer claim it stall out on them, tow to Canadian Tire store, Code P0300 random misfire cyl detect, quote for 4 AC injector and fuel regulator, but don't garauntee it will fix the ... Trouble codes: P0300 (Multi cyl misfire detected), P0200	View
	2002 Chevrolet Astro LS 4.3L Misfire, MIL Lamp on VIN: 1GNDM19X82 Vehicle came in for a CEL and misfire. The misfire was on cylinder 1. Performed compression test, Lab scope, leak down,checked crank sensor, MAF, Fuel pressure, switched injector to another cylinder with no change. Removed head and had head checked. Found a ti... Trouble codes: P0300	View
	2006 Chevrolet Impala LS 3.5L air bag light VIN: 2G1WB58K26 HI all. The air bag light is on and flashing on this vehicle and there are no codes. the initial problem was that the car would not shut off for approx. 3 seconds after turning off the key. After checking several things I checked for aNY reprogramming issues t...	View
	2003 GMC Envoy XL SLE 4.2L Hesitation VIN: 1GKET16S93 Greetings, This suv has low power on accel, was in last month and fan clutch replaced. Owner said it was better but still not right. It feels like a restricted ex. when you accel on highway.No codes, great fuel trims 0 to -3%,tps agreeing and opening 100%-vis...	View
	2003 GMC Savana 1500 5.3L mastercylinder VIN: 1GTFG15T03 hello techs ?im stumped on this gmc i diag the hydro booster on this van because it was leaking .but the thing i dont under stand is when i go on a road trip the brakes will apply by there self if i brake off and on they will lock up and the van will not move....	View
	1999 Oldsmobile 88 Royale 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3HN52K7X Thanks in advance for any advice or help given. Customer complaint, can feel a miss and a clunking noise. Noise is in trans, like torque conveter slipping. Checked with scanner and found no MIL on, but has misfire in #1. Plug was black and #1 was only misfire ... Trouble codes: 0300 (misfire)	View
	1988 Pontiac Fiero Sport 2.5L clutch VIN: 1G2PE11RXJ Help please. We have triple checked the hydraulics on this car. The problem is the clutch won't fully disengage when pushing the pedal all the way down. Can't put in gear if the engine is running. shifter works fine going thru the gears w/engine off. If you pu...	View
	1998 Pontiac Sunfire SE 2.4L daytime runnung lights VIN: 1G2JB5246W Here's one hopefully someone can help me with.. It's a 98 Pont. Sunfire. The daytime running lights do not work. The low beams do not work. Here is what we have found and what we have done. With the key on and the headlight switch off I have voltage at all 3 t...	View
	2001 Pontiac Grand Prix SE 3.1L Electronic VIN: 1G2WK52JX2 This Grand Prix is killin us. The AC blower works on high sometimes. It never works on any other speeds. As a matter of fact when you put it on any other speed it shuts down power to the AC control and the compressor. When you turn it back on high there is a d...	View
	1995 Saturn SC1 1.9L Charging VIN: 1GSDURET98 alternator replaced 3 times not charging at times. getting field input. new battery. light comes on when not charging. battery term. at alt hot. ?	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Cadillac Catera 3.0L Misfire, MIL Lamp on VIN: W06VR52R9W My customer,a wholesale car dealer chose not to precede with repairs. He paid my bill and sold the car to a retired car dealer who is a customer of mine (and a friend). This customer wants me to fix it. I am going to replace v.c. gaskets first and go from ther... Trouble codes: P0300 (multiple missfire), P0301 (p0302-), P0302 (p0303-), P0303.	5
	1999 Cadillac DeVille 4.6L abs VIN: 1G6KD54Y4X thanks guys for all your help,turned out to be a bad ground on trans case (main ground ckt for ebtcm).	5
	2001 Cadillac Seville SLS 4.6L Electronic controls VIN: 2G6KS54Y01 I'm sorry for the long await on this post. I have tried multiple times to reach the customer to have them come back in, but have had no response. Due to time issues, I needed to close this case. If I recieve response from the customer or have information to ad...	6
	1990 Chevrolet Corvette 5.7L hvac VIN: 1G1YY2384L hello after more research i found that a non-working radio,cd player and casette combo shares the same data line.g.m. says that can cause the hvac to default at times. anyone have a radio? this car will be on the never-ending project list! HOORAY! thank...	3
	1999 Chevrolet Corvette 5.7L Serpentine Belt VIN: 1G1YY22G7X We concluded that it needs the Alternator and Tensioner replaced. There is a new alternator part # [...] to correct this condition see TSB # 99-06-04-029A. He just recently had Chevy change the tensioner and belt trying t...	14
	2003 Chevrolet Trailblazer North Face 4.2L fan clutch VIN: 1GNDT13S13 well the fix is in, we had 3 problems all together, first the ground wire was broken, we repaired it, still had a problem, 2nd we found the 5 volt referance wire was grounding out on the frame next to the ecm, repaired that wire. still not working. even after ...	4
	1997 GMC C2500 Sierra SL 5.7L Brake pull VIN: 1GTFC29R3V Thanks for the input. The fix was the abs module. When I removed it I put air pressure into the in side of the front system and only got pressure on the right side output. Inslatted a rebuilt unit from our supplier and the truck was fixed. Thanks again.	7
	1992 Pontiac Grand Am SE 2.3L Misfire VIN: 1G2NE54D0N Thanks to All who replied, Chris from Michigan, The updated grounded outer ring crankshaft pulley was the trick . thanks again, strange problem, quick fix, thats what makes this forum great.. thx again.Mark..	11

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