Misfire/Compression Test - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 09-06-2014
Member
Thread Starter
 
Join Date: Sep 2014
Location: Chickamauga, Georgia
Posts: 1
Misfire/Compression Test

Ok, So my check engine light came on and Cylinder one was misfiring. I changed the plugs, wires, and the coil pack and it still was missing. I did a compression test and Cylinder 1 was 170 psi while the others were all around 125-130 psi. What causes High Compression? Also My truck has 218,000 Miles on it.
Reply With Quote
  #2  
Old 09-06-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,619
That is an odd one.

My guess would be valve train issue, pull valve cover on #1 side and check intake and exhaust valve rockers and rotate engine thru all 4 strokes to see if both are opening fully.

I would think compression on all cylinders should be around 160-180psi.


Cold engine
all spark plugs removed
throttle propped open at least 1/2 way, put something on gas pedal or press it down when cranking

test each cylinder with at least 4 compression "hits"

Many recommend warm engine compression test but over the years I have found as a diagnostic tool the results of cold vs warm tests provide the same diagnostic information, and cold engine is just easier to work with.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Did my compression test today ... CaliRanger 2.9L & 3.0L V6 Tech 30 10-01-2015 07:45 AM
PO316 - Misfire(Compression) Heads? Fordsarebadass4 2.9L & 3.0L V6 Tech 1 07-13-2015 11:08 AM
PO316 - Misfire(Compression) Heads? Fordsarebadass4 Drivetrain Tech 0 07-13-2015 12:44 AM
1992 ranger 2.3L compression test - which side matteusclement SOHC - 2.3L & 2.5L Lima Engines 1 08-15-2013 01:58 AM
Did a compression test........ God,Country,FORD 4.0L OHV & SOHC V6 Tech 20 10-18-2009 08:46 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 02:47 PM.


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.