running rough
Thread Starter
|
New User
Joined: Apr 2009
Posts: 16
Likes: 1
running rough
i just changed my oil, air, and fuel filters less than 1200 miles ago, since i did this, my truck started shaking when running, like i have a dead cylinder, but not bad enough to be a dead cylinder. the only time it has acted anything like this is when one of my fuel lines popped. but it doesnt shake near as bad as it did when that happened. i have tried advancing and retarding the timing. it settles it down a little when i advance it and shakes all to hell when i retard it. i dont have any visible fuel leaks or kinked lines and i am not smelling raw fuel. i also dont have a fuel pressure guage either. what could b the problem or what do i need to check to find out without playing the guessing game and replacing parts that are not the problem.
Senior User
Joined: Apr 2006
Posts: 478
Likes: 0
From: houma, louisiana
i know how you feel with this issue. mine only started after i put 8 new (not reman) injectors and new return lines and caps. tried doing the same with the adv and retarding the timing with the injector pump to have the same issue you have. does yours have that little pinging knock when you first start it up cold?
Thread Starter
|
New User
Joined: Apr 2009
Posts: 16
Likes: 1
running rough
all new injectors, lines, caps, o-rings, new fuel filter gaskets too. it doesnt shake so bad when i first run it, its when it gets to full operating temp that the shaking starts. it is a 90 7.3. it doesnt knock real loud until i advance the timing
Senior User
Joined: Apr 2007
Posts: 315
Likes: 0
From: Conway, AR
Good chance you got a little dirt in that new fuel; filter on the pump side and it clogged an injector. You can try loosening the inkection line nuts one at a time and listen for sound change. if you hit one that doesn't chage, youve found a culprit.
Thread Starter
|
New User
Joined: Apr 2009
Posts: 16
Likes: 1
running rough
i just did the old hose to the ear trick (like a stethescope) and all but #6 made the same ticking noise. #6 made a hollow noise and didnt really "tick" at all, before i take anything apart i will try that & see if it changes.
Trending Topics
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
New User
Joined: Apr 2009
Posts: 16
Likes: 1
running rough
ok, i just took all my injectors back to ford and got another set. i installed them & i still have this shake. i turned every fuel line fitting on the injectors & nothing changed. i am lost... i even did a compression check on all the cylinders every one was over 400 just about as soon as i turned it over... new crankcase vent, no leaks anywhere, running cool ( new thermostat from ford), good compression (new oil pressure sending unit from ford) please help!
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
When you replaced the injectors you did use new copper gaskets each time, did you check in the injector hole for old copper gaskets or carbon. Anything done to the IP prior to this problem arising..... Any smoke from the tailpipe(s).... what color and smell.
Thread Starter
|
New User
Joined: Apr 2009
Posts: 16
Likes: 1
running rough
yes i used new copper gaskets, no there was nothing in the injector holes, never done anything to the injection pump. there was some carbon in the holes but i cleaned them out before i put the new ones in both times. i am blowing just a puff of blue smoke, but only when i mash on it. but i had a bad crankcase vent and it was letting oil by the diaphram into the intake. but i replaced that about 259 miles ago to be exact. so i think it is still burning the excess oil off. it didnt ever do this until i replaced the air filter. when i partially block the air coming into the canister it seems to calm down a little. could it be possible that it is getting too much air? should i try to turn the fuel up a little? i am trying to stray from doing that until i get a pyrometer.