Hi all,

Had a misfire on one of our trucks that has the V10 the other night, showed 3 bad COP's. Replaced those and still have misfire. Local shop says burnt valve on cylinder 7.

I don't have much experience with the 6.8L as this is the first I've owned. Truck has 195k on it and is an 2001.

I've heard these engines can last forever so to speak with proper maintenance.. is it worth putting money into it to fix the valve? Local shop did not quote it yet but I assume this can't be more than 800-1200$ to pull the head and repair?

Thanks for any insight.

 

Were the spark plugs replaced or just the 3 coils?
Were the coil boots replaced or just the coils?
If it was my truck I would do some simple and free investigation into the cheap parts that are easiest to get to, rather than start peeling off thousand dollar bills to pay someone because he told me to.

 

Welcome to FTE!

Burned valves aren't really a common engine problem anymore especially in the V10 (I can't honestly say I've ever seen or read of one), did they say how they diagnosed the problem? A compression test is the only way to correctly diagnose a valve problem and it WAY more common for a improperly diagnosed ignition problem to be the real issue.

 

could be a fouled spark plug due to bad coil

 

I'm with Twigs. Only way to tell is a compression test. After you get the results, you can determine if repairing the head is worthwhile. The V10 can go 300k miles and above with darn near trouble free service.

 

Hey guys,

Just an update -- got the truck back before they did any work on it since I was skeptical. Found that the o-rings for an injector weren't seated right and was causing what felt like a misfire along with the original COP. Fixed that and runs like new with 197k on it.

thanks for the help!

 

That's a strange solution... So was it leaking fuel?

 

Probably sucking air at the injector with the bad seal causing a lean hole.