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#277412 - March 31st 2009 12:13 am GM 4.3L V6 - P0302 (Cylinder 2 Misfire) Help
ihatemybike Offline
journeyman

Registered: June 16th 2002 12:00 pm
Posts: 75
Loc: Elgin, IL
Grumpy needs your help. For quite some time Grumpy has set the P0302 (Cylinder 2 Misfire) code. Usually misfire codes are due to dirty injectors/sticky poppets. I've done Seafoam and the GM Fuel System Treatment Plus, to no avail. Since the injector/poppet is usually the cause, I decided to swap the injector for cylinder 2 with another cylinder. This in theory should move the misfire to another cylinder, if the injector is indeed the problem. Having completed the swap between cylinder 2 and 4, Grumpy still sets code for cylinder 2. Using the ScanGaugeII, I have discovered that if I don't let the throttle position sensor (TPS) hit 0 the code won't set. Playing with that idea I adjusted the idle to roughly 1000 RPM. Yeah, the van idles at 25 mph. Driving around, I see the computer recalculates where TPS 0 is and despite the much higher idle the code will set. However still, if I don't let the TPS hit 0 the code doesn't set. Anyone with GM experience have any ideas?

Here's a list of causes for P0302 errors and if I've done something about it:
* Faulty spark plug or wire - New installed
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector - Moved injector to different cylinder
* Burned exhaust valve
* Faulty catalytic converter(s) - Exhaust does not smell like rotten eggs
* Running out of fuel - Fuel pressure is good
* Poor compression - Wife hasn't reported smelling burnt oil after following the van.
* Defective computer
_________________________
Aaron

1999 Astro (Green the Daily Driver) - 2WD, 4.3L, 3.23, 180k+ miles, FE2 steering
1997 Astro (Grumpy the $250 Rally Van) - AWD, 4.3L, 3.42, 300k+ miles on the orig eng and trans, $30 eBay fuel pump

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#277494 - March 31st 2009 9:24 am Re: GM 4.3L V6 - P0302 (Cylinder 2 Misfire) Help [Re: ihatemybike]
vanatic05 Offline

Vanaholic


Registered: June 02nd 2005 12:00 pm
Posts: 5145
Loc: Auburn IL
It maybe the O2 sesnsor..with 300,000 miles I would say it is ready...
_________________________
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Director: Vanatics Van Club
Member of Bad Boys of Illinois
92 GMC 3500 454/4bbl
Partner on Project 2nd Generation

roiboi65@yahoo.com
www.vanatics.com
www.cardomain.com/ride/2385823/1


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#277511 - March 31st 2009 10:17 am Re: GM 4.3L V6 - P0302 (Cylinder 2 Misfire) Help [Re: vanatic05]
Doc 2% of Canada, EH!!!! Offline
Vanner

Registered: June 10th 2003 12:00 pm
Posts: 12680
Loc: Burlington, On, Canada Eh !!!!
A new wire could be faulty, or the plug broken, bad cap connection, etc etc....Try swapping wires on that cylinder
_________________________
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Supporting Vanning, by going Vanning In A Van !
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#277834 - April 01st 2009 9:24 am Re: GM 4.3L V6 - P0302 (Cylinder 2 Misfire) Help [Re: Doc 2% of Canada, EH!!!!]
ihatemybike Offline
journeyman

Registered: June 16th 2002 12:00 pm
Posts: 75
Loc: Elgin, IL
Swapped the cap and rotor from Green into Grumpy yesterday, no change.

Went to emissions to fail anyway, stupid emissions.

I'll borrow Green's oxygen sensor tonight and see if that helps.
_________________________
Aaron

1999 Astro (Green the Daily Driver) - 2WD, 4.3L, 3.23, 180k+ miles, FE2 steering
1997 Astro (Grumpy the $250 Rally Van) - AWD, 4.3L, 3.42, 300k+ miles on the orig eng and trans, $30 eBay fuel pump

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