Engine knocking/clanking when accelerating hard, and excessive blowby in air filter? - JeepForum.com
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Unread 03-04-2013, 10:38 AM   #1
sethisimmons
Registered User
1988 YJ Wrangler 
 
Join Date: Jul 2012
Location: Lynchburg, Virginia
Posts: 2
Engine knocking/clanking when accelerating hard, and excessive blowby in air filter?

Just got my 1988 YJ w/ 4.2l manual back in July of last year, and am working on starting to get it trail ready. Ever since I've gotten it I've had two issues though.

First: When accelerating hard/going up hills, there is a clanking noise and I don't seem to have much power. It doesn't sound like any piston knocking noise I've heard before, more like a loose bolt vibrating or something. I've checked all the bolts I can think of, and everything looks nice and tight, but the noise persists. It's quite noticeable when I'm on the highway, and is very annoying. I mainly just wanna see if it's something that could be evidence of a deeper issue with the engine/transmission.

Second: Ever since I got the Jeep I've been slowly noticing a blowby issue where oil is getting blown back into the air filter. It got so bad once that I practically lost all my oil into the air filter pan and ruined the filter. Ever since then I still seem to have some blowby coming back into that pan, nothing as bad, but still definitely there. Any ideas on what I can do to fix that?

Thanks for reading and in advance for any help! I've been on the forum for a while but it's my first post. Excited to get involved in the Jeep community!

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Unread 03-04-2013, 01:02 PM   #2
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,653
Bad pcv on the blowby. Pull your valve cover. Chances are the inside is mucked up too.Other possibility is compression issue with bad rings. Run the compression test.
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Unread 03-04-2013, 02:01 PM   #3
sethisimmons
Registered User
1988 YJ Wrangler 
 
Join Date: Jul 2012
Location: Lynchburg, Virginia
Posts: 2
Would that be the front PCV, or the rear breather? I replaced the front PCV to be sure about a month ago, and it seems to have helped a little bit, but I am definitely still getting more than I should. I'll do a compression test when I get off work, and probably pick up a new breather hose as well to ensure its not cracked/leaking. Thanks! I'll update after I do the test. Also gonna pick up a valve cover gasket to replace that, just to be sure. Thanks again for the help!
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