973604x4

Truck knocks bad. Rail pressure has been goofy for a few days. Last night on my way home from work around midnight it started knocking. I drove it home and parked it.

Cranked it today....all sounded good. Hit the High Idle and it started knocking/humming/rumbling. You can feel the knock on the valve cover and oil pan.

No diesel in the oil. Nothing leaking. Oil pressure is normal (according to a factory gauge). Rail pressure is still un-steady but is up around normal #'s. EGT's are at 225* idling which is normal since twins.

This is bad. Very bad. No codes. Bullydog is back on stock now, all boxes have been pulled.

HELP

BigBlue

Last time I heard a truck just start randomly knocking he dropped the #2 exhaust valve seat and trashed the head and piston and I think that cylinder as well.

rustyshakelford

well phil...i hope its nothing major bud. button it up, take it back to stock. trade trannys with me and trade it in on a 6.7

brett

rstone

well phil sound like you need to come join me over on the 6.7 side like you were talking about

973604x4

yea we were just talking about having reliable vehicles too....

bigcat83

pulled bvalve cover off and look under valve terrain.check valve clearences.or it could be a rod knocking.

BigBlue

I'll take the tranny.

Luken

I wouldn't get a 6.7

After talking to a guy last night that bought one, then with all of the problems and PATHETIC fuel mileage the dealer ended up getting him out of a 6.7 cab/chassis into a mega 5.9.

Hopefully you get it worked out Phil!

Lucas

973604x4

Ive driven a 6.7...and it had a "box" on it too....I loved it.

Luken

What was the fuel mileage?

I've talked to 3 guys locally and the best they had ever got was 14.1

973604x4

its about the same as what you have experienced.

XLR8R

Sure sounds mechanical, Phil - wonder if the squirrelly RP readings were indicative of misbehavior of one or more of the sticks.

The CTD is very durable and reliable, but still a mechanical device with finite limits - can't change the laws of physics (though they can be fooled from time to time! )

To quote: (thanks Don!) "perhaps you've overdrawn your CTD account?"

haloman

Ouch you just got your truck running pretty good with the twins.

rstone

well phil it looking better for me driving to work and back a 140 round trip I it was showing 16.5 but you can't go buy the computer but I can till you I didn't burn as much fuel as I did with out the box.

Luvnacumns

Man Phil that sucks!!! You've been working hard on that thing!! Hope you get it figured out..

SHane