Valve tap - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 06-07-2009, 08:07 AM   #1
Join Date: Jun 2009
Posts: 2
Valve tap

I have a 2003 Wrangler with the 2.5 4 cyl. all stock. The exaust manifold came loose and I drove it like that a month or so. I now have a valve tap at idle or whenever driving at low rpm 2000 to 2300 rpm's. At about 24 to 2500 it goes away. I run regular oil 10-30. It has 66000 miles on it. Tried some additives (not the teflon ones) nothing seems to work. Any ideas?

ETJeep is offline   Quote
Old 06-07-2009, 10:00 AM   #2
Join Date: Aug 2008
Posts: 2,473
Did you actually replace the manifold gasket, or just tighten it?

A small exhaust leak often sounds like a valve tapping.

Try this:
Dark garage, lights out. Use a strong pencil beam flashlight to look around the manifold area while you spray a little FI cleaner (make sure it says "safe for O2 sensors") down the Throttle body - while it's running of course.

The cleaner will make smoke in the exhaust system. The exhaust system should be tight and carry all the smoke out the back. If you see smoke in the engine compartment from it, you can probably see where the leak is.

Listening through a hunk of heater hose like a stethoscope helps locate the noise too.

Or remove the rocker cover to use the hose, and/or put your fingers on each rocker, one at a time. Your fingers will feel the "bump" better than your ear can.

Betcha it's still an exhaust leak.

It's no wonder the country is falling apart - stupidity abounds!
rrich is offline   Quote
Old 06-07-2009, 10:03 AM   #3
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 38,551
Is the valve tap continuous at all times even when the engine has been running a while/warmed up fully? And as rrich says, it still might be nothing more than an exhaust leak.
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 06-07-2009, 12:12 PM   #4
Join Date: Jun 2009
Posts: 2
I just tightened the bolts... but the leak was where the manifold connects to the exauhst not the manifold itself to the head. I just looked around and also noticed a small hose leading from the air cleaner to the valve cover has huge 2 inch splits in it. I'll try the flashlight idea tonight. You people are cool!! Free advice is very groovy.
ETJeep is offline   Quote

Thread Tools

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Valve cover breathers/filters machocheese TJ Tech Forum 2 04-26-2009 08:30 PM
01 Jeep Wrangle Transmission cooler valve ? bigcountry TJ Tech Forum 1 04-02-2009 06:53 PM
EGR Valve Go_Wrangler YJ Tech Forum 0 03-17-2009 12:18 PM
Valve Cover Issues!!! wouldwerker4u YJ Tech Forum 26 03-05-2009 10:38 PM
2.5L PCV valve meets AEM CAI soundline YJ General Discussion Forum 7 11-19-2006 01:34 PM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 09:02 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC