Engine stumble @ WOT 100mph+

[jwilliams3]

I was on the way home tonight and a newer Powerstroke wanted some race action.

Anyhow, under WOT TST on 6x6 and the BDDL on 90hp I was getting some cutting out/ stumbling coming from the engine.

Like fuel was shutting off for a split second then coming back.

RPM's were pretty high being over 3k.



Is the rail running dry? injector problem? pump problem?

The FASS is putting out 14psi at that rate.

 

[Russellmag]

Maybe the Speed limiter/Governor??? I use to get the same problem with my 04. 5???

 

[jwilliams3]

Is there a speed limiter that hits after a certain mph to shut off fuel?

I was probably going around 107-110mph when the bad stumble hit.

 

[Jengle]

Sounds like you hit the rev limiter. Mine comes in about 113. Somebody makes a box that overrides this, I think its BD. One of the TDR guys posted that he had this and hit 134 with his truck, before he got worried and backed it down. I have seen this box advertised in the TDR mag. Don't know right off which issue, but it has been there.

 

[RWood]

If you want more rpms look at www.pacificp.com

 

[dan shss]

You just hit the speed limiter,Mine shuts me down at about 110mph. .



What took you so long to figure out the 110 cut off

 

[Giachino]

Yep, the speed limiter, hit it tonight at about 110... .

 

[Giachino]

Maybe the Speed limiter/Governor??? I use to get the same problem with my 04. 5???

Nice truck dude... . 06 and already decked out... . congrats!

 

[jwilliams3]

Its not the speed limiter.

I got it to do it at 95 mph yesterday.



It is after I have been WOT for about 6 seconds.

50psi at first, then boost starts coming down to around 45 psi like I am running out of fuel.

Then the big stumble, almost like a big fart went through the engine! :-laf



I am thinking I am running the rail dry because it wont do it on the lower levels of the TST.

Also, I have noticed with my limited testing that will not do it as fast IF I turn up the Ramifier before going WOT w/ the TST on 6x6, BDDL on 90hp.



Just some observations I thought I would report.

Power is still great, so I dont think it is a relief valve gone bad.



Either, maybe, the CP3 can't keep up... who knows...

 

[Bob4x4]

Have you looked at the rail pressure while it is acting up?



Bob

 

[jwilliams3]

I will probably have to do that sometime.