diagnosing cylinder knock - Ford Powerstroke Diesel Forum
Please Visit our Site Sponsors
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 10-24-2011, 03:28 AM
Compression Ignition Addict

Join Date: Dec 2007
Posts: 2,896
Thanks: 7
Thanked 1 Time in 1 Post
Feedback Score: 2 reviews
diagnosing cylinder knock

On my wifes 99 I have knock. Let me start by saying I believe the injectors are tired. At first diagnosing, I needed 2 injectors, cylinder 7 and 3. They were real loud an and making a ton of racket(real bad when cold) I have ticking coming from some others but I am chasing a knock. I am thinking piston or wrist pin. AT 50 mph when I take my foot off the accelerator all goes quiet like it should, but if you listen carefully the knock is there, just a lot quieter due to no fuel explosion in the cylinder. I believe its cylinder 3.
(new reman injector in the hole) (casserly)
When i unplug that cylinder its odvious that thats the loudest source my noise.
I find that if I unplug a cylinder and walk into my house, or walk away from the truck, that the noise I am trying to fix is easier to hear. Getting away from the other injectors makes hearng the knock clearer.
It does not seem to get much louder when driving it. I think I have a piston that is failing.
My truck had injctor noises a while back, but made no noise at 50 mph when i took my foot off the pedal an let it coast, this one does have a quiet
knock still.
any thoughts?
Reply With Quote Quick reply to this message
Sponsored Links
Old 10-24-2011, 07:35 PM

Join Date: Oct 2009
Location: Riverside/Norco, Ca
Posts: 3,771
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 2 reviews
these trucks dont often "knock", besides injectors causing issues, i'd say change injectors and go from there, i bet thats your problem in the first place to be honest.. obviously get a compression test if you want.
Reply With Quote Quick reply to this message
Old 07-11-2012, 05:07 AM
Powerstroke.org Rookie

Join Date: Aug 2007
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Send a message via AIM to poopypants
did you ever find out what the knock was? i have an early 99, that was knocking, took it to a shop and asked what was wrong, 95 dollars later the told me i had a bad injector, they wanted 1500 to replace bank of 4.

took truck home, replaced all 8 injectors, still knocking. determined that #7 cyl is where noise comes from, i believe it's the wrist pin after listening with a stethescope.
Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What state or province do you live in?
Security Question
*Required, this field is not shown to others. Enter the last two characters of the word "Powerstroke"
Security Question #2
*Required, this field is not shown to others. "While balancing on a piece of wood, two inches by four inches known as a 2x4, john and his friend sally both spotted a dalmatian inside a truck with sirens, headed to put out a fire. State the animal mentioned in the sentence above."
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 04:56 PM.

Powered by vBulletin® Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.