225 V6 misfiring, possible valve problems? - JeepForum.com

 
LinkBack Thread Tools
post #1 of 1 Old 01-08-2010, 03:58 PM Thread Starter
dc_sniper9130
Junior Member
1969 CJ5 
 
Join Date: Jan 2010
Location: Spokane, WA
Posts: 32
225 V6 misfiring, possible valve problems?

Hello everyone! My name is Tony and this is my first post. First off, I have a '69 CJ5 (named Wilford) with the 225 oddfire V6. i bought this guy back in august, and during the initial inspection before purchase i could hear a puffing sound coming through the exhaust. it was frequent, but non-consistent. i was concerned, so i drove it. the motor ran incredibly strong and idled smoothly despite the sound. i figured the thing is 40 years old with the original engine, and it's not going to be perfect. i got a good deal anyways.

okay, so last month i was on my way to work, cruising along at 65 on the freeway, then all the sudden my engine got weak. well ... not really all the sudden, it was a steady, noticeable decrease in power over the course of about 5 seconds or so... to compensate i gave it some more foot, and it started misfiring like crazy. i backed off a bit, and it smoothed out except for an occasional misfire (out of the ordinary for this engine, it never misfires at speed), with only enough throttle input to maintain speed at 50-60 mph. i got to work, pull into my parking space, and rev the engine a few times. normally, this motor purrs, i mean it's really smooth all the time. now it sounds off, and it's shaking a little bit.

i threw the hood up and check the manifolds, and it seemed like everything was firing. i babied it back from work, then on the way back to work the next day, the same thing was happening except i could only go about 45 before the misfires started. i took surface streets back to my apartment, shut it off, and haven't touched it since fearing some kind of internal mechanical failure and not wanting to make it worse.

when i hook up a vacuum gauge, it vibrates between about 15 and 22 inches or so. i haven't done a compression check on all the cylinders (mostly because my compression tester is extremely frustrating to work with because it threads in, but the threaded part doesn't rotate freely on the hose).

literally everything in the ignition system is brand-new except for the distributor base. points, cap, rotor, plugs, wires, coil, and ballast resistor.

any theories or thoughts?

thanks!
-tony

dc_sniper9130 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Replacements for Liquid Check Valve/Roll Over valve jpd1899 Jeep CJ Forum 143 08-25-2015 09:07 PM
Changing valve cover gaskets/valve covers gtrpup2 Jeep CJ Forum 20 03-28-2013 07:35 PM
Brake Combination Valve/Proportioning Valve Question Wrangler1642 Jeep CJ Forum 1 01-17-2011 04:43 PM
Replaced everything, still misfiring. help! ChefPatrick Jeep CJ Forum 5 10-27-2009 08:34 PM
258 Misfiring Under 1500 RPM - WHY?? Tshark299 Jeep CJ Forum 10 01-11-2005 04:45 PM

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 Off
Pingbacks are On
Refbacks are On

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