missing around 2k rpm

Wes Lewis · Mar 12, 2012

new to the site, I have a 97 f-350 auto. Its just a parts truck i got off of a psn member. the problem is the truck misses/stumbles when free revved. It idles fine, and if I slowly rev it it will rev up past 3000+ rpm. but if i hit it and harder then that it will rev up to 2-2500 rpm. and wont rev past it. every so often it will tho. It smokes ALOT of white/blueish smoke when it misses aswell

Its a rusted out truck i bought for a motor swap, but i want to get it to run right before i pull it. all the brake lines are rusted so I cant get a good test with a load on it.

recent parts were,
fuel pump
water pump
starter
batteries
fuel filter
oil filter
fuel lines
rebuilt the fuel bowl
glow plugs
air filter
cam sensor

the truck cranks somewhat then my other 7.3s do to start. and I drained the oil and almost 5 gal came out! it seemed like it was thin (consistency of water when warm) would this cause it?

Im leaning towards injector o-rings, fuel bowl was full of crap and the filter was black.

any one have any other ideas? IPR maybe?

the help is greatly appreciated, I dont want to take the time or money on the o-rings or IPR and have it not fixed

I tried unplugging the icp aswell and it didnt help

Wes Lewis · Mar 13, 2012

Any one have an idea?

I'm on a get 15w40 and try just putting thicker oil in this weekend

portlandareae28 · Mar 13, 2012

define "miss" does it stumble and stutter and fall on its face?

Wes Lewis · Mar 13, 2012

http://www.youtube.com/watch?v=5L4-vEnTg8g

yes, stumbles stutters and wont rev past it

portlandareae28 · Mar 13, 2012

does the truck drive? what does it do under load?

Wes Lewis · Mar 13, 2012

I can't get a good description of how it drives, all the brake lines are rotted out

TheSmokinStroke2002 · Mar 13, 2012

Wes Lewis said:
I can't get a good description of how it drives, all the brake lines are rotted out

You gonna be around this weekend

Sent from my ADR6400L using Tapatalk

Wes Lewis · Mar 14, 2012

I'll be In Pittsburgh

ford_trck · Mar 14, 2012

Fuel Pressure your running out of fuel pressure.

Wes Lewis · Mar 14, 2012

Holds 55-60 lb of fuel press at idle and when stuttering

portlandareae28 · Mar 14, 2012

you said this is for a motor swap? do you have another truck? My truck had a similair (not the same) stutter issue and didn't want to make power and it ended up being the IDM maybe try plugging in a known good one.. I wouldn't bet a huge sum of money on it being your problem, but at least you could eliminate it from the list of possibilities.

Brian

Wes Lewis · Mar 14, 2012

Ok thanks, it's going into an idi, but I have a good idm I'll try in it, thanks!

4.0l sahara · Mar 16, 2012

If there is oil in the fuel bowl and it's making oil there is a good chance it needs injector o rings even if that isn't the stumble.

Wes Lewis · Mar 16, 2012

I was thinking that also. Just wanted some other opinions. I'm changing the oil n trying a different idm today. It's hard to tell if it's mixing fuel with just being able to idle it around

Wes Lewis · Mar 16, 2012

Swapped idm, changed oil, and swapped fuel peddle all with no luck.

Noticed a small oil leak on the back of the drivers side head oil rail.

Going to Pull the valve covers now

Wes Lewis · Mar 31, 2012

Changed the I hector o-rings, still Doining it,

I noticed it has a lope/miss at idle now. Narrowed that down to the pass. Side 2 rear clyinders. Also cranks over for a long time before starting. ~15 sec how and cold.

Going to check the UVCH and valve cover gaskets now

Wes Lewis · Mar 31, 2012

Checked the harnesses, rear injector was unplugged. Prob happened when I put the valve cover on.

While the valve cover was off I noticed bubbles around the glow plugs! I switched a few around n it seemed like it moved with the plugs. So Im guessing that is what's going on. It's losing compression through the plugs.