missing

Reply Subscribe

Thread Tools

Search this Thread

Mar 17, 2012 | 06:06 PM

CPaulsen

Thread Starter

Senior User

Joined: Apr 2011

Posts: 447

Likes: 1

From: Southern Oregon

missing

Pulled my 5th wheel over the mountain.2001 F350....V10......started pinging really bad and missing. Down to 35mph in 2nd just to keep going. Got home....scanned it.....showed it had a miss fire on 5 cylinders. This is with new plugs and boots about 6 months ago. Has been running great. Cleared the codes...did a test drive....showed miss fire on 5...6...and 10......cleared again...another test drive...showed misfire on 5 and 6....checked the plugs and installed new coils and boots....same misfire again on another drive. Any ideas?

Mar 25, 2012 | 05:55 AM

CPaulsen

Thread Starter

Senior User

Joined: Apr 2011

Posts: 447

Likes: 1

From: Southern Oregon

Guess nobody had any suggestions. Pulled #5 plug....it was almost completly apart. Only been in there for a month(motorcraft plugs also).Checked compression....40# in #5. Pulled head....burnt valve. And this after having both heads off last month....burnt valve on #4. Redid all valves and seats.Put all steel inserts in the heads and then came this problem. Must be a low fuel pressure problem. Have to find out why!!

Mar 25, 2012 | 08:39 AM

samsdad02

More Turbo

Joined: Jul 2009

Posts: 705

Likes: 12

From: Taxachusetts

any symptoms before this? low power, high fuel consumption etc?

Mar 25, 2012 | 10:37 AM

critterf1

Posting Guru

Joined: Feb 2010

Posts: 2,057

Likes: 2

From: Newport, N.C.

Have you checked fuel pressure to see what you have? How about vacuum leaks around this cylinder? Injector functioning properly?

Mar 25, 2012 | 11:31 AM

jh818

Cargo Master

Joined: Jul 2009

Posts: 2,885

Likes: 26

From: Chino, California

How about your injector?

Mar 26, 2012 | 03:30 AM

CPaulsen

Thread Starter

Senior User

Joined: Apr 2011

Posts: 447

Likes: 1

From: Southern Oregon

Only symptoms I had was heading up the mountain and it started to ping....then got really loud most likely before the plug went.
Have to get it running and find out if its an injector,MAF,IAT.fuel pump,??? Has 117K on it.

Apr 6, 2012 | 05:20 AM

CPaulsen

Thread Starter

Senior User

Joined: Apr 2011

Posts: 447

Likes: 1

From: Southern Oregon

Update....pulled the passenger side head....#5 valve was stretched .70. Checked the head again...looked like low fuel problem.Seafoamed the injectors/cleaned fuel rails and replaced the MAF sensor just cause. Runs ok now.....gonna hook onto the 5th wheel this weekend and hit the mountain grade for a test run.Will see what happens.

10 Ways Ford is LOSING to the Competition

Joe Kucinski

Top 6 Best Deals Available on New Fords & Lincolns Right Now

Brett Foote

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Verdad Gallardo

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

Apr 8, 2012 | 10:43 PM

V10ZILLA

Senior User

Joined: Jun 2010

Posts: 468

Likes: 0

From: Canyon Country, Ca

I would check/replace the injectors. They would also through codes as well.

Apr 9, 2012 | 03:52 AM

#10

CPaulsen

Thread Starter

Senior User

Joined: Apr 2011

Posts: 447

Likes: 1

From: Southern Oregon

Pulled the 5th wheel about 12 miles for a test....with 9500 lbs. back there I thought it would tell me something. On 2 of the steepest grades had a slight ping for a few seconds. I am running 87 octane gas right now and will try 89 and see if that works.Going without towing you hear nothing.