91 Jeep cherokee problem Help! - Page 2 - JeepForum.com

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post #16 of 24 Old 01-11-2014, 09:25 PM
rjbruzan
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It sounds like a lifter is collapsing (due to being dirty) while hot at restart. Numerous oil changes with a high detergent oil may help it get. I have had good result with Rotella to clean up dirty engines. As others have said a Quality filter is manditory. Napa gold and Wix are good lower cost choices. Getting the engine to operating temp is important to cleaning it out. Dont be tempted to use an engine flush as this could be the death of the engine. I had one of the XJs get noisy for a period then quiet down. It now has 173000 on it and I run 95 miles a day with it. This is a common problem with the 4.0`s.

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post #17 of 24 Old 01-12-2014, 07:05 PM Thread Starter
91Cherokee7
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If the engine was hot hours ago and if i let it sit until it was cold it sometimes ticks for a sec but if the engine was still hot the ticking would be non stop. Yet if it was anything major shouldn't the check engine come on?? But it does not so it must not be anything major
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post #18 of 24 Old 01-12-2014, 07:13 PM
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Quote:
Originally Posted by 91Cherokee7 View Post
If the engine was hot hours ago and if i let it sit until it was cold it sometimes ticks for a sec but if the engine was still hot the ticking would be non stop. Yet if it was anything major shouldn't the check engine come on?? But it does not so it must not be anything major
Check Engine Light is for electrical malfunctions, not mechanical ones.

When you start it hot, and the tick is there, what happens if you shut the engine off and wait a few seconds and restart it? Tick gone?

If you own a Renix Jeep, you'll want to check this out.

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post #19 of 24 Old 01-12-2014, 09:30 PM Thread Starter
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Originally Posted by cruiser54 View Post
Check Engine Light is for electrical malfunctions, not mechanical ones.

When you start it hot, and the tick is there, what happens if you shut the engine off and wait a few seconds and restart it? Tick gone?
No..the tick/knock will still be there when engine is hot. The engine loses no power or jerks. Its just a loud noise.
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post #20 of 24 Old 01-12-2014, 09:46 PM
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Originally Posted by 91Cherokee7 View Post
No..the tick/knock will still be there when engine is hot. The engine loses no power or jerks. Its just a loud noise.
Even if you shut it off and restart it immediately after starting it hot/ ?

If you own a Renix Jeep, you'll want to check this out.

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post #21 of 24 Old 01-12-2014, 11:43 PM Thread Starter
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Even if you shut it off and restart it immediately after starting it hot/ ?
YES...
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post #22 of 24 Old 01-13-2014, 06:10 AM
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Here's something I would try. Change JUST the filter to a Wix or Napa Gold.

If you own a Renix Jeep, you'll want to check this out.

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post #23 of 24 Old 01-13-2014, 12:19 PM Thread Starter
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Ok
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post #24 of 24 Old 01-23-2014, 10:29 AM Thread Starter
91Cherokee7
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Its been COLD 10 degrees for like the last week, I work the night shift and i sleep during the day but its been snowing and it just so happens on my days off so i may just wait till spring or if it warms up to like 40 degrees ill take my engine apart with some help to see why it ticks/knocks. Ill try to keep this up-to-date.
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