cylinder head work need help please!!!!

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Apr 5, 2013 | 07:55 PM

BumsModified98xj

Thread Starter

Seasoned Member

Joined: Mar 2013

Posts: 258

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From: chi-town il

Year: 98

Model: Cherokee

Engine: 4.0

cylinder head work need help please!!!!

Ok I did a port job to a 7120 got it milled 0.10 and used the slim mopar performance head gasket the problem im having is that my spark plugs are going bad really quickly I changed them a couple weeks ago and there going bad again has any one had this problem? If so how did you solve it? Please help me guys this is my DD and its killing my M.P.G's currently its the stock ignition with autolite 985 copper core spark plugs. HELP JEEP DOWN!

Apr 5, 2013 | 08:17 PM

XJGunny

Seasoned Member

Joined: Nov 2012

Posts: 401

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From: NC

Year: 2001

Model: Cherokee

Engine: 4.slow

Have you double checked the gap? Should be .35, may be different being the your head was milled down. Try to gap the plug to .40 and see if that helps???

Apr 5, 2013 | 08:47 PM

SeriousOffroad

CF Veteran

Joined: Apr 2008

Posts: 13,952

Likes: 17

Model: Cherokee

Try a set of Bosch IV's.

Apr 5, 2013 | 08:58 PM

BumsModified98xj

Thread Starter

Seasoned Member

Joined: Mar 2013

Posts: 258

Likes: 0

From: chi-town il

Year: 98

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by XJGunny

Have you double checked the gap? Should be .35, may be different being the your head was milled down. Try to gap the plug to .40 and see if that helps???

there currently gapped to .40