motor knock at high speeds. - Ford Powerstroke Diesel Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 2 Old 08-22-2010, 10:00 AM Thread Starter Rookie
Join Date: Aug 2010
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
motor knock at high speeds.

So i have searched for a similar problem to no avail. the truck started knocking at high speeds about a month ago. talked to some people, and ran a contribution test. had a cyl 3 fail, but no other codes being thrown. went and got a full set of injectors and glow plugs put in, all went good until i did a contribution test. cyl 3 still bad, and now its throwing cyl 1 and cyl 8 faults. buzz test passes and the truck has no other codes, but now every time i have been on the highway for more then 20 mins at about 1800 rpm or more i get a really bad knock like a car valve tick but a little less metallic. stops when I'm off the throttle and stops when I'm off the highway no matter the rpm. check and all the injectors are seated and the under valve cover harnesses looked ok. dont know where to go from hear. don't want to just start replacing things i dont need. its a 99.5 f350 6 speed.

Last edited by busyizzy; 08-22-2010 at 10:08 AM.
busyizzy is offline  
Sponsored Links
post #2 of 2 Old 08-22-2010, 02:39 PM
Johnny Law Brown

jc82chevyman's Avatar
Join Date: Sep 2008
Location: Tipton, IN
Posts: 366
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Check your HPOP level, after it happens and see where the level is at and check your IPR, ICP and your IDM you are going to need a good scanner like AE the check this stuff but thats where I would start

2002 F-250 IH 444E
AFE Stage II
4" TB exhaust
35" BF Goodies
1995 F-250 IH 444E
jc82chevyman is offline  
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:


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
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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

For the best viewing experience please update your browser to Google Chrome