Another Romping Thread

Reply Subscribe

Thread Tools

Search this Thread

Jun 21, 2021 | 04:58 PM

#16

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

Quote:

Originally Posted by Hit Man X

While on injectors, can they pass oil internally into the fuel side?

Yes, the intensifier piston oring is the only thing that separates the oil from the fuel internally.

Quote:

Originally Posted by literallynothing

Are there other symptoms of worn out poppet valves and seats that I should look out for? Or does it usually just cause a hard start/romp issue?

A leaking oil side will cause terrible drivability/idling issues and at worst a no start due to low oil pressure.

Jun 21, 2021 | 05:37 PM

#17

gtex

Lead Driver

Joined: Apr 2001

Posts: 6,175

Likes: 21

From: Texas

for me. Romping is something you might do with a girl that was previously n a romper :-) what are we talking about here? high idle, surging idle, bogging down ??

Jun 21, 2021 | 05:50 PM

#18

literallynothing

Thread Starter

Tuned

Joined: May 2021

Posts: 304

Likes: 51

From: Windsor, CO

Quote:

Originally Posted by Bitterroot Diesel

Yes, the intensifier piston oring is the only thing that separates the oil from the fuel internally.

A leaking oil side will cause terrible drivability/idling issues and at worst a no start due to low oil pressure.

If the oil side was leaking, I would imagine I would at least get a little smoke on start up and wouldn’t have a perfect oil level after driving 4K miles right? Between no drivability or regular idle issues, and what I just said, that’s what made me think the injectors are in fact not bad, and not the culprit

Quote:

Originally Posted by gtex

for me. Romping is something you might do with a girl that was previously n a romper :-) what are we talking about here? high idle, surging idle, bogging down ??

“Romping” is the term that popped up time and time again when I researched my issue. When I start the truck the RPM jumps from roughly 400 to roughly 600 repeatedly. If I let it sit, it does that until it dies. If I hold the throttle and keep RPM off 1000 for a second or two, the truck idles fine and runs fine until the next start up

Jun 21, 2021 | 07:54 PM

#19

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

Here is the worst case poppet valve wear.

Jun 21, 2021 | 07:56 PM

#20

literallynothing

Thread Starter

Tuned

Joined: May 2021

Posts: 304

Likes: 51

From: Windsor, CO

Quote:

Originally Posted by Bitterroot Diesel

Here is the worst case poppet valve wear.

https://www.youtube.com/watch?v=_X08z7uuK_U

excuse my lack of understanding of the internals of these injectors, but based on that, couldn’t I just pull the valve covers and turn the truck on and look to see if their is oil mixed in the fuel as it comes out?

Jun 21, 2021 | 07:57 PM

#21

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

I've never seen fuel come out of the top before.

Jun 21, 2021 | 07:59 PM

#22

literallynothing

Thread Starter

Tuned

Joined: May 2021

Posts: 304

Likes: 51

From: Windsor, CO

Quote:

Originally Posted by Bitterroot Diesel

I've never seen fuel come out of the top before.

like I said, I don’t have a deep understanding of these injectors, so if you could advise me on how to tell if this is my issue that would be very much appreciated. I am not super interested in dropping over $1000 on injectors unless I know for sure that this is my issue

Jun 21, 2021 | 08:02 PM

#23

literallynothing

Thread Starter

Tuned

Joined: May 2021

Posts: 304

Likes: 51

From: Windsor, CO

Quote:

Originally Posted by Bitterroot Diesel

I've never seen fuel come out of the top before.

sorry, I didn’t realize I said that backwards. I mean fuel mixed in the oil as it comes out. I’m assuming that’s what the video you just showed was?

FTE Stories

Ford Trucks for Ford Truck Enthusiasts

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Jun 21, 2021 | 08:03 PM

#24

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

You'd have to have the injectors tested by a reputable shop to rule them out, but it's highly likely something in the LPOP/HPOP path. Injectors are just one of the components.

Jun 21, 2021 | 08:05 PM

#25

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

Quote:

Originally Posted by literallynothing

sorry, I didn’t realize I said that backwards. I mean fuel mixed in the oil as it comes out. I’m assuming that’s what the video you just showed was?

Oil should not flow past the poppet valve when closed. Calibration fluid is what you see coming out of the injector in the video.

Jun 21, 2021 | 09:05 PM

#26

literallynothing

Thread Starter

Tuned

Joined: May 2021

Posts: 304

Likes: 51

From: Windsor, CO

Quote:

Originally Posted by Bitterroot Diesel

You'd have to have the injectors tested by a reputable shop to rule them out, but it's highly likely something in the LPOP/HPOP path. Injectors are just one of the components.

gotcha, thank you for the help. I’ll have to look into shops in my area to test them. Probably do that when I’m in there doing valve springs and some other small stuff. For now I’ll probably go down the LPOP path since it’s a faster and cheaper project and is the original pump. Perks of having a full service history

Jun 21, 2021 | 09:06 PM

#27

Bitterroot Diesel

Former Vendor

Joined: Sep 2020

Posts: 2,597

Likes: 695

From: Florence, MT

A great time to install a new harmonic balancer.

Jun 21, 2021 | 09:27 PM

#28

Hit Man X

Lead Driver

Joined: Sep 2002

Posts: 9,553

Likes: 2,034

From: North Texas

[QUOTE=Bitterroot Diesel;19937611]Yes, the intensifier piston oring is the only thing that separates the oil from the fuel internally.{/QUOTE]

Hmmm. Any issues with driving? Mine started at 14F without being plugged in back in Feb when Houston was shutdown via 'The Freeze'

I have oil consumption of around 1qt per 1000 miles. No external leaks, aside from a mildly weepy oil pan to block. The higher the HPOP pressure (which corresponds with the tune) the more oil I consume. Truck has some remans in it, no clue when or who installed. Orings are new, Alliant.