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Old 05-10-2011, 09:19 AM   #1
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'99 TJ 4.0 Lifter & Engine Weight

Hi Guys,

My '99 TJ 4.0 is getting close to 120k miles. About a month ago, I started getting some (what I believe to be) lifter noise. It was most noticable on start-up and when idling, however, when running, it seems to disappear (or the engine noise is too loud to continue to hear the lifter).

I have always run 10W-30 and tried to use some lucal additive to lessen the tapping. It didn't work. I had read on other forums to try using some heavier oil, so I swapped out my 10W-30 for 20W-50. I really haven't noticed any improvement in the tapping, however, now I am having some ignition issues. I have never has starting issues, but now it will take several tries to get her to turn over. I'm suspecting that this could be due to having a higher viscositivity (sp??) oil.

So, what would you guys do? Would you keep running 20W-50 and deal with the ignition issues, or drain it out and go back to 10W-30? What other additives could I try to reduce lifter noise? I don't want to have to get it rebuilt.

What's the worst that can happen if you run with a sticking lifter?

Thanks!

[edit] - post title should have read Engine Oil Weight.

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Old 05-10-2011, 09:31 AM   #2
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Switch back to 10w30 oil and by a new coil. I've used all kind of oil from mobil 1 to the cheapest junk on the market and mine still makes a little noise. My jeep also was cranking a little longer on start ups and after a tune up it still did it until I change the coil. But your jeep may have coil packs im not sure on the 99.

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Old 05-10-2011, 09:39 AM   #3
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You're talking about an ignition coil? If I change back to 10W-30, there is no reason to. There was NO hesitation on ignition when running the 10W-30. If it ain't broke, I'm not fixing it!
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Old 05-10-2011, 09:46 AM   #4
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Well then what's your problem. You change to thicker oil and it takes longer to start or it cranks over more before it starts. If its cranking longer it sounds like the coil.if it cranks slow sounds like weak battery not thicker oil. The 4.0 doesn't need 20w50 oil that's a bit overkill and takes longer for the oil to heat up to operating temperature
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Old 05-10-2011, 10:12 AM   #5
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99's have the simple coil system, not coil packs.
My Jeep does this same exact thing. The noise seems to be more pronounced when the engine is cold.
I may go down and pick up a coil one of these days. I know I need a TPS as well, to address a different symptom.
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Old 05-16-2011, 04:06 PM   #6
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Most 4.0L engines will knock until they warm up. Mine does this and even the owner's manual says it is normal. As for the hard starting, mine also does this. There is a valve that sticks open and allows the fuel to drain back down. When you start it, turn the key to accessory for about 2 seconds before turning it all the way and it will start up fine. Hope this info helps.
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Old 05-16-2011, 04:34 PM   #7
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Quote:
Originally Posted by mpoff1 View Post
Most 4.0L engines will knock until they warm up. Mine does this and even the owner's manual says it is normal. As for the hard starting, mine also does this. There is a valve that sticks open and allows the fuel to drain back down. When you start it, turn the key to accessory for about 2 seconds before turning it all the way and it will start up fine. Hope this info helps.

Don't you mean the "run" position? The fuel pump doesn't operate in the accessory position. And yeah a defective valve in the fuel tank will allow the pressure to bleed off. Turning the key to run for a few seconds, then off, then to start may get you going if this is the problem (but from what I read, not the original poster's problem)

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