P0306 cod on 2000 Silverado

[chiefheaphy]

Anyone had any experience with this code? It is cylinder 6 misfire. I am just fixin it to sell the truck so I want to replace as little as possible. New plugs didnt help. Whats next distributor cap and wires?

 

[MTChevy]

check fuel injector.... if that is not the problem... check compression

 

[MTChevy]

oh and make sure you got spark on 6 too

 

[chiefheaphy]

changed fuel filter, checked fuel pressure and it was 60 psi so the fuel pump should be good. Changed cap, rotor, plugs and wires and I do have spark. 12 volts to all injectors and all injectors read 11.2 ohms (shouldnt it be 0)? Still buggin. Have yet to check compression. I also read that a misfire could be do to a plugged poppet or a sticking valve. So new gas with additive and new oil with additive are next.

Could this have something to do with the truck sitting for a little over a month in the cold? It was fine before it sat.

 

[UPS]

Water in the gas maybe?

Mike

 

[chiefheaphy]

Water in the gas maybe?

Mike

It keeps throwin the same code though so I think it has somethin to do with that specific cylinder.




I figured I would go ahead and replace the number six injector. When I pulled off the upper manifold I noticed this. Not sure what it means, if its even bad, but I thought I would ask some of you fellas before I got to much farther. Thanks

The upper left (six cylinder) galley thing there is full of oil, when none of the others are.

BTW 140,000 miles.

 

[chiefheaphy]

morning crowd?

 

[gone huntin]

Vortec engines are notorious for intake leaks, I would've checked for vacum leaks before removing the intake manifold.

 

[chiefheaphy]

I replaced the number six fuel injector and the misfire jumped to cylinder 5. This has to mean something. Any ideas??

 

[MTChevy]

get your injectors flowed? spray around for intake vacuum leaks?