2000 XJ 4.0L P0300, P0303, P0304 & tuneup questions - Page 2 - JeepForum.com
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post #16 of 18 Old 05-09-2013, 11:22 PM Thread Starter
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2000 XJ Cherokee 
Join Date: Nov 2010
Location: Grand Rapids
Posts: 60
Originally Posted by buildin1XJ View Post
If you are going to be paying for replacement head + labor and an outrageous fee of 700 for rear main seal I would go with the reman. engine as long as it has an upgraded head such as a TUPY or Clearwater head.
Does a TUPY or Clearwater head use a better quality casting?

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post #17 of 18 Old 05-09-2013, 11:41 PM
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1999 XJ Cherokee 
Join Date: Oct 2011
Location: Knoxville
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A Tupy head will be found in 2003 and 04 grand Cherokees and Wranglers and were made by a Brazilian company and it is a upgraded head. Clear Water heads are a brand new upgraded head shipped to your door for around 450$ Google Tupy 0331 heads as well as Clearwater heads.
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post #18 of 18 Old 05-28-2013, 08:19 AM Thread Starter
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2000 XJ Cherokee 
Join Date: Nov 2010
Location: Grand Rapids
Posts: 60
Well I finally got around to working on the XJ and started with replacing the plugs. The plug tips were really bad. The gaps were worn to the point that the gap was probably double to triple the .035" spec'd gap. I did not do a compression check since time was not available to me. I figured since the plugs were so bad that I'd just replace them and see if I still get the cylinder misfire codes.

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