Radom multiple missfire code issue - Ranger-Forums - The Ultimate Ford Ranger Resource

4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

LinkBack Thread Tools Search this Thread
Old 12-13-2012
Thread Starter
Join Date: Oct 2012
Location: Littleton, CO
Posts: 1
Icon5 Radom multiple missfire code issue

Help! Just replaced a 4.0L engine in my 2005 Ranger with one out of a 2011 with only 7000 miles. The truck runs great except when you are cruising down the highway down a hill. It throws random multiple misfire codes - po300 and sometimes different cylinder misfire codes. I used all the peripheral parts off my old engine except the intake and EGR valve. Spark plugs are new, Fuel and air filter are new. I ran K44 through the injectors to clean them out. Anyone have a clue what would cause it to throw these codes and causing it to misfire when cruising down a hill at highway speeds?
Some history on the vehicle. The old engine blew and put a lot of oil in the exhaust. It took a while to burn it all out - tons of smoke. It did pass emissions so the cats should be OK. Would a O2 sensor cause this without throwing an engine code?
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
need help for a missfire sturgill 4.0L OHV & SOHC V6 Tech 5 10-08-2012 03:34 PM
Sputtering or missfire... PwrRngr 4.0L OHV & SOHC V6 Tech 1 06-05-2009 12:38 PM
Missfire? Frank91 2.9L & 3.0L V6 Tech 13 01-30-2009 02:59 AM
3.0 missfire and rough shaking manofak 2.9L & 3.0L V6 Tech 10 10-07-2008 04:03 PM
missfire when going out of overdrive enkaarob 4.0L OHV & SOHC V6 Tech 4 03-03-2008 07:45 PM

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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -6. The time now is 02:37 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.