find the knock help needed

Reply Subscribe

Thread Tools

Search this Thread

Jul 1, 2014 | 08:51 PM

88beast

Thread Starter

Elder User

Joined: Sep 2007

Posts: 662

Likes: 0

find the knock help needed

i have a knock/ leak. the front pass side of the engine you can hear a knock ( my buddy says its a air leak). yesterday when i cracked the front pass injector the engine did not change, tonite i put a new injector in and now the noise goes away a good bit. as for the part im confused about, my buddy swears its the headgasket coming out in the front of the engine, but i have not seen any other signs like oil and coolant mixing, or a loss of power.

long story short im finally stumped any suggestions?

Jul 1, 2014 | 08:55 PM

hairyboxnoogle

Lead Driver

Joined: Apr 2008

Posts: 6,938

Likes: 13

Is it a knock, or is it a leak? Start with injectors, crack 1 at a time until the noise goes away and you have your problem cylinder. If that doesnt do it, id pull the valve cover and look at the valvetrain.

Jul 1, 2014 | 10:57 PM

Macrobb

Postmaster

Joined: Dec 2011

Posts: 3,860

Likes: 7

On these engines, it's usually mis-matched/failing injectors.

Jul 1, 2014 | 11:41 PM

88beast

Thread Starter

Elder User

Joined: Sep 2007

Posts: 662

Likes: 0

thats what i thought, so i popped the injector, and the engine did not change. that screams bad injector. so i replaced it. now the noise is still there but it gets less with the new injector cracked

Jul 1, 2014 | 11:52 PM

88beast

Thread Starter

Elder User

Joined: Sep 2007

Posts: 662

Likes: 0

heres a vid

there is a definite exhaust leak in the vid, but you can hear the knock im talking about also.

Jul 1, 2014 | 11:59 PM

hairyboxnoogle

Lead Driver

Joined: Apr 2008

Posts: 6,938

Likes: 13

Could be a bad valve or similar. Id pull the valve cover. Also, with the engine cool, start it and let it idle a sec. Feel the exhaust manifold right at the exhaust port, see if the suspect cylinder doesnt get hot, or as hot as the others. Works pretty good on gassers, but our exhuast might not be hot enough at idle to tell.

Jul 2, 2014 | 07:16 AM

88beast

Thread Starter

Elder User

Joined: Sep 2007

Posts: 662

Likes: 0

they heat evenly, i already checked that one, so i know its fireing

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

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Jul 2, 2014 | 07:32 AM

88beast

Thread Starter

Elder User

Joined: Sep 2007

Posts: 662

Likes: 0

i cracked a few just to test, they make it miss when cracked just like a good injector should, i have a spare set laying around i think i will test and replace all of them, its been on my list for a while

they are junk no name reman injectors, so i have a set of E code stanydnes to put in

Jul 3, 2014 | 06:52 PM

#10

flaboy63

Junior User

Joined: Feb 2007

Posts: 82

Likes: 0

From: Macclenny Fla

Just a quick observation I had the same noise on my IDI and it turned out to be the vacuum pump. I disconnected the belt and it went away So I replaced the pump now no more noise