4.0 giving me troble - 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 05-20-2009
swickwake's Avatar
Thread Starter
iTrader: (2)
Join Date: Aug 2008
Location: porterville, ca
Posts: 373
4.0 giving me troble

my motor has like 160,000 miles and it kicks, sputters, bogs down in acceleration and in crusing speed.

i have change out coils, wires, coil pack. and cleaned the maf.

the only codes the i have been having are misfires in 3,4,6 cylinders since jan. i have changed out plugs like 3 times since then and the symtomes would go a way till 3000 to 8000 miles later.

im thinking i may have warped or cracked heads. but i do not have white oil. i am loosing some coolant tho. is there a way to check for this with out pulling the heads.

please help.

Reply With Quote
Old 05-20-2009
wydopnthrtl's Avatar
iTrader: (2)
Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
Boggin down and hard mis fires are usually two different things.

I'd call a "bog" a smooth decrease in power. If so.. it's most likely a lack of fuel. Could be a lack of air.. but that's easily fixed by checking the filter.

A hard mis-fire is almost always ignition related. A head gasket or intake gasket leak (or cracked head) won't usually cause this except just after startup.

IMO.. you might have a combination of the two problems. Change the fuel filter and see what that does for the power situation. Then investigate wether of not your getting coolant in the combustion chamber. (might have to go to a shop and have them do leak tests)

Reply With Quote
Old 05-20-2009
karrbass4life's Avatar
Join Date: Nov 2004
Location: Cincinnati, Ohio
Posts: 3,072
The fuel filter is a good start.

If you think the gasket is the cause a compression test will show that.

Compression Test How-To #1

Compression Test How-To #2

Last edited by karrbass4life; 05-20-2009 at 05:12 PM.
Reply With Quote
Old 05-20-2009
whippersnapper02's Avatar
RF Veteran
iTrader: (1)
Join Date: Sep 2006
Location: Earth, Milky Way Galaxy
Posts: 7,415
Isn't there a intake gasket problem on the OHV engine? That could be it.
Reply With Quote
Old 05-20-2009
Redrocket's Avatar
iTrader: (6)
Join Date: Jan 2007
Location: Waynesville n.c
Posts: 1,993
mine had a number 4 missfire ran like crap changed all kinds of ignition stuff never fixed it well i was lossing coolent just like a gallen are 2 every 4 weeks are so pulled heads off had a bad gasket and bad head fixed it and runs like a champ and missfire code is gone.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Evap system giving a Check Engine Light??? mustangdave 2.3L & 2.5L I4 Tech 4 09-12-2008 04:45 PM
Giving some love to the front :-D WowMike2001 Project Logs 60 08-13-2008 02:55 AM
2" Coil Spacers giving extremely small lift jamesxEDGE Suspension Tech 18 07-03-2007 05:44 AM
Questions about giving the truck a tune up msulifter37 4.0L OHV & SOHC V6 Tech 6 06-25-2007 10:12 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 02:26 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.