Lets play whats that sound? (with video!) - JeepForum.com
 
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post #1 of 7 Old 02-08-2013, 05:21 PM Thread Starter
elnielsen
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Lets play whats that sound? (with video!)

Sometimes when I start her up, there's a clacking, so loud I shut her off and restart and it doesn't happen. I caught it on video and it stopped by itself after 20-30 seconds.

Is the cause of this obvious? Should I do anything about it? I believe other sounds are more trouble. It is a 4L 6 cyl on a 94 YJ with 225K miles.

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post #2 of 7 Old 02-08-2013, 05:47 PM
Mean Max
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Linky no worky.

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post #3 of 7 Old 02-08-2013, 06:18 PM Thread Starter
elnielsen
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Sorry, I made public.
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post #4 of 7 Old 02-08-2013, 06:25 PM
timatoe
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Sticky lifters?

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post #5 of 7 Old 02-08-2013, 06:35 PM
Chrisnvegas
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Sounded like a lifter. How is your oil pressure at idle fully warmed up?

1. Dirty thinned out oil.
2. Sticking lifter.
3. Worn cam bearings causing low oil pressure.
4. Worn oil pump

If your oil pressure is ok (at least 25 psi idle fully warmed up engine)
Maybe you just have a sticky lifter. You can try adding a quart of ATF and run it easy for a couple hundred miles, then change the oil and filter. ATF has detergents that help free lifters and helps clean sludge out of the motor.

Some people try Marvel Mystery oil, some use Neutra, some use Gunk engine flush, ect, ect. These don't always work but might be worth a try. If none of these work, might be time to freshen the motor.

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post #6 of 7 Old 02-09-2013, 02:13 PM Thread Starter
elnielsen
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Having just replaced the oil pressure sending unit, it runs at about 45 psi idling. I just did an oil change and it's very clean looking when I check the dipstick. I have run a quart of Mystery oil before. Currently I added a partial quart of Lucas as it has 225K miles on it.

I guess I won't worry about this much and worry more about the other sounds it's making coming from the bottom end.
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post #7 of 7 Old 02-09-2013, 02:36 PM
Chrisnvegas
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Quote:
Originally Posted by elnielsen View Post
Having just replaced the oil pressure sending unit, it runs at about 45 psi idling. I just did an oil change and it's very clean looking when I check the dipstick. I have run a quart of Mystery oil before. Currently I added a partial quart of Lucas as it has 225K miles on it.

I guess I won't worry about this much and worry more about the other sounds it's making coming from the bottom end.
Close to your next oil change, throw in a quart of dextron. Some old timers I know really swear by this for lifters. Maybe the last 500 miles of your oil change. Your oil pressure sounds good.

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