[567]

\'04 TJ Engine break in question

I am the new owner of a 2004 TJ X model. This being my frist brand new Jeep (all the others had at least 90k on them!) I was wondering if I should be doing anything special for the break in period. The owner's manual says the first 300 miles to keep the high RPM's to a minimum, but I've got 850 miles in it now and for some reason, it just doesn't seem to have the power in 5th gear to maintain speed up slight upgrades. I'm sure my gears have a little to do with that, but I was wondering if anyone else has picked up some power farther along into the early life of the engine. I also just slapped 31's on it so, the crappy 215/R75/15's that came on it might have let me maintain speed better also.

oh boy do I have lot's to do to it!

 

[Guest]

Re: \'04 TJ Engine break in question

I purchased a 03 TJ Freedom last year, 4.0 5 speed. It did run better after the first oil change at 3000 miles. It runs stronger now at 6000 miles or I have gotten used to it.

Badcattledog 90YJ 03TJ

 

[Mike86CJ7]

Re: \'04 TJ Engine break in question

When I bought my '03 Sahara, the dealer told me to take it easy for 1000 miles. Kept it under 55, rpms no higher than 2200, no jackrabbit starts, etc.

I now have 7800 miles on it and it seemed to really loosen up around the 5000 mark. It now revs more easily than when it was new and the "seat of the pants meter" feels that it pulls a bit harder too.

 

[MTPockets]

Re: \'04 TJ Engine break in question

The bigger tires probably did it, especially if you have 3.07 gears. My friend put 31" BFG ATs on his '02 Sport and it is a little sluggish with his 3.07 gears.