Major miss

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Jan 19, 2024 | 07:18 PM

luvemhot

Thread Starter

More Turbo

Joined: Dec 2005

Posts: 669

Likes: 0

From: Idaho City Idaho

Major miss

After my truck warms up about 20 minutes it develops a miss enough so that is barley runes. I have replaced the HPOP, IPR, Injector drive nodule.
Not sure my next move, but thinking changing the value cover gaskets. then Injectors.
Thanks in advance for your help

Jan 20, 2024 | 12:35 AM

Jimmy's Pilot Service

Laughing Gas

Joined: Nov 2020

Posts: 994

Likes: 367

From: Republic of Texas

I can feel the heat of the shotgun barrel from here after that...

Absolutely no mention of pulling codes or running the tests that FORScan or FORScan LITE has the ability to do. Use the OBD II reader they tell you to use.

Start there or reload.

Jan 20, 2024 | 07:01 AM

RacinJasonWV

Lead Driver

Joined: Jul 2017

Posts: 6,853

Likes: 2,331

From: WV

I agree with Jimmy. Let’s do some diagnostics before swapping any more parts.

I’d start with checking the fuel pressure. https://www.ford-trucks.com/forums/a...4&d=1592859516

Jan 20, 2024 | 08:23 AM

97-psd

Logistics Pro

Joined: Mar 2007

Posts: 4,579

Likes: 837

From: knoxville, tn

CEL come on?

you Can also perform a test through the IDM connector to check the integrity of the wiring

Jan 20, 2024 | 09:18 AM

Kwikkordead

Fleet Owner

Joined: Jun 2004

Posts: 25,090

Likes: 1,112

From: Rio Rico, AZ.

Quote:

Originally Posted by Jimmy's Pilot Service

I can feel the heat of the shotgun barrel from here after that...

HAHAHAHAHA!
And since we're skeet shooting here, I'll bet on a worn out fuel injector being the culprit. Works ok with morning thick, cold oil, but get it warmed up and the pressure bleeds off inside or something like that and now it cannot do a good job with minute injections like what is required at idle speed and load.

Jan 20, 2024 | 10:15 AM

hobohilton

Fleet Mechanic

Joined: Nov 2006

Posts: 1,664

Likes: 219

From: Northwest

I've known a few guys who turned engines into boat anchors during a prolonged diagnostic period of time.
Barley runs is a Red Flag.
Get some qualified help before you ruin a rebuildable engine.

Jan 20, 2024 | 12:14 PM

brandonrr

More Turbo

Joined: May 2015

Posts: 670

Likes: 13

From: Nampa, ID

Have you tried pushing on the 42 pin connectors on the valve covers while it is misfiring? If one of your 42 pin (UVCH) connectors is loose, it'll only run on 4 cylinders and will smooth back out when when you push on the loose connector.

Another quick thing to check is blowby. Have you checked the blowby yet? A decent amount of white vapor is okay, but any noticable pressure coming out is bad.

If you haven't already, check out the tech folder that is stickied in this forum. There's a ton of good info there that could help with diagnosing your truck.