Knocking/shaking idle - Page 3 - Ford Truck Enthusiasts Forums

2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 engine

Knocking/shaking idle

LinkBack Thread Tools Search this Thread
Old 10-22-2013, 07:18 PM
friscofordguy friscofordguy is offline
Freshman User
Join Date: Sep 2008
Posts: 29
friscofordguy is starting off with a positive reputation.
Charz, I'm having similar symptoms. What did your mechanic find?
Reply With Quote
Old 04-01-2014, 06:53 PM
charz charz is offline
Junior User
Thread Starter
Join Date: Aug 2012
Posts: 53
charz is starting off with a positive reputation.
Originally Posted by friscofordguy View Post
Charz, I'm having similar symptoms. What did your mechanic find?
I've just been running lucas in it and driving, I'm not putting another penny into fixing the motor if it stops working then I'll just drop a jasper in it.
Reply With Quote
Old 04-15-2014, 08:43 PM
bfl4 bfl4 is offline
New User
Join Date: Apr 2014
Posts: 4
bfl4 is starting off with a positive reputation.
Originally Posted by charz View Post
So after a decent drive when I get to a redlight/stopsign/etc the truck will idle rough and shake but giving it a little bit of gas (1k RPM) seems to smooth it out however it doesn't throw any codes or the CEL. The truck is a 2008 F150 with the 5.4 and 90k miles.

I've searched quite a bit on this issue and I can't seem to find any real fixes other than swap parts out until something works and I've heard everything from filters to cam phasers or low oil pressure (I will be taking it to the mechanic to check the oil pressure)

so far I've:
Replaced the air and fuel filters
Changed the oil and oil filter (synthetic and oem filter)
cleaned the MAF and cleaned the throttle body

also is the 2008 equipped with an IAC Valve because I've read that it wasn't and I can't seem to find the IAC if it is.

I had the same problem on my 2004 5.4L had a rough idle, also noticed a rattling noise coming from the right side hub while driving, and my cruise control would work on and off. Turned out it was a vacuum problem. I replaced the vacuum valve on the driver side fire wall (~15$) and the vacuum reservoir that sits behind the battery, its a little black box that holds pressure found one at a local junk yard for 10$. When you change this out I would also look at the connectors throughout the vacuum lines to make sure they aren't clogged up. After I did all that my rough idle disappeared, hub noises disappeared, and my cruise control worked whenever I needed it too.

Good Luck
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Help with high idle on 94 460? NotMatt 1987 - 1996 F150 & Larger F-Series Trucks 15 08-24-2016 11:18 PM
stalling,bucking when i hit gas after truck sits. Codycamper 1987 - 1996 F150 & Larger F-Series Trucks 6 10-16-2015 03:22 AM
V10 missing & running very badly, sucking sound (not just my wallet) contento Modular V10 (6.8l) 27 11-07-2013 11:35 PM
1993 f-150 3.51 5.8L Running a bit rough and Replace PCV Valve? madeinusa 1987 - 1996 F150 & Larger F-Series Trucks 6 05-13-2013 06:58 PM
Can I make my bronco run better? 1990, 351w ErrorS 1978 - 1996 Big Bronco 20 12-06-2011 11:14 PM

Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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

Forum Jump

All times are GMT -5. The time now is 02:00 AM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.