Cylinder 6 misfire 3.0L

[cincyspqr]

Alright guys, replaced the coil pack, spark plugs, wires, fuel filter.... what next? Idk why it's still misfiring... 85k on the engine. 140k on the truck. Any ideas or common problems?


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[modelageek]

Alright guys, replaced the coil pack, spark plugs, wires, fuel filter.... what next? Idk why it's still misfiring... 85k on the engine. 140k on the truck. Any ideas or common problems?


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Burnt Exhaust valve

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[cincyspqr]

Ok thanks. I posted it in the wrong forum. Sorry guys. I'm new to this and idk how to delete it and repost it. Fml


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[modelageek]

Ok thanks. I posted it in the wrong forum. Sorry guys. I'm new to this and idk how to delete it and repost it. Fml


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The mods will move it to the 3.0. Create a detailed signature. We will need more info.

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[cincyspqr]

The mods will move it to the 3.0. Create a detailed signature. We will need more info.

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Done, thanks for the advice. It's happening only occasionally and only at idle for more than a minute or two. Runs a little rough.


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

 

[modelageek]

Done, thanks for the advice. It's happening only occasionally and only at idle for more than a minute or two. Runs a little rough.


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

Hmmm with rebuilt engine they should have solved the burnt valve issue. Does the Cel flash?(this is a misfire). What are the actual codes?

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[cincyspqr]

Hmmm with rebuilt engine they should have solved the burnt valve issue. Does the Cel flash?(this is a misfire). What are the actual codes?

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It does not flash. When the check engine light does come on which is infrequent, the code reads "misfire cylinder 6"


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

 

[modelageek]

It does not flash. When the check engine light does come on which is infrequent, the code reads "misfire cylinder 6"


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

The only thing left is the fuel injector and compression or leak down Test. I would add some Techron to the gas tank just for giggles!

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[cincyspqr]

The only thing left is the fuel injector and compression or leak down Test. I would add some Techron to the gas tank just for giggles!

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Done, praying it helps... [emoji23]


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

 

[cincyspqr]

Done, praying it helps... [emoji23]


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt

Ok I realized it idles rougher in drive than park. Just because it's set like that or?


1999 Ford Ranger XLT Reg Cab 4wd 3.0L flex- 140k on truck, engine replaced at 64k with LKQ rebuilt