Renix-Era Fuel Injector Cleaning w/Seafoam - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Renix-Era Fuel Injector Cleaning w/Seafoam

ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO Alloy usa heavy duty ball joint kitsWe have FLASHLIGHTS! Great for your Emergency bag!

Reply
Unread 11-30-2012, 01:06 PM   #1
jmandrumz
Registered User
1990 XJ Cherokee 
 
Join Date: Nov 2012
Location: Batesville, MS
Posts: 7
Renix-Era Fuel Injector Cleaning w/Seafoam

My rig is a '90 xj 4.0 auto, which came with 152k on it. I've had it a couple months and have cycled through various minor maintenance issues. New plugs, cap, rotor, wires, and even a new dizzy. I live in smog-test-free Mississippi, so ran a straight pipe with NO cat and NO muffler, and added a cheap Ebay cone air intake. These yielded a massive mpg and power improvement, but I was still having some fuel delivery problems that occasionally caused sputtering, especially when idling in traffic.

At first, I tried both Techron and Seafoam in the tank. Both times, this proved disastrous, as it dislodged gunk from the bottom of my ancient fuel tank and clogged the pump temporarily. Until I get around to swapping in a new poly tank, detergents in the tank are officially off the table.

I had the typical problems of a VERY low idle (250 rpm!), and lengthy cranking times in the morning. After researching, I found that the injectors, once fouled, won't close off fully when you shut down the motor, and will drip fuel into the cylinders. You can confirm this as i did...by doing an oil change and smelling LOTS of gasoline in the oil drain pan!

I removed the air tube at the throttle body (this is done with a "star" screwdriver, just 3 screws.) and used throttle body cleaner and a toothbrush to remove all the accumulated gunk on the butterfly. After replacing the intake tube, I purchased a can of Seafoam, and unhooking the vacuum hose at the FRONT of the valve cover, used an eyedropper to slowly drip the Seafoam into the hose while the engine idled.

This process will take about 20 minutes, and to be effective, you don't wanna just dump all the Seafoam in too quickly. That will not only stall the engine, but also, won't clean as effectively.

Usually when doing an injector cleaning at my old lube shop job, we would run the car for a good 30 minutes as a dripper bottle slowly dripped injector solution into the booster line, periodically revving the throttle. This would always yield large quantities of white smoke out the tailpipe, and brackish watery goop would splatter out as well. However, while cleaning my XJ today, there was NO smoke at all....just an initial splatter of a small quantity of black sooty gunk.

WOW what a difference! My idle is now around 1k rpm, and the motor runs smoother than a baby's keister.

jmandrumz is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

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.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.