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post #1 of 13 (permalink) Old 01-04-2004, 11:39 AM Thread Starter
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dry knock

It happens about half the time in the morning start-up mode only. I'd rather hear my 'ol lady nag than that awful sound. (1) I wanna know if it typifies a larger bearing clearance than normal. (2) If it is probably the last bearing to get pressured w/ lube. (3) If I'm losing some bearing material every time it happens. It sounds like one rod only. I use 10-30 dino. It wouldn't be so bad if I could idle at a lower rpm upon start-up. These IAC's seem to be overkill, I realize you can't have motors dying on people when the A/C is on, etc. but I get tired of the constant revving the IAC causes. I put a flat washer in the IAC hose for awhile to tone it down but got paranoid and took it out.
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post #2 of 13 (permalink) Old 01-04-2004, 01:37 PM
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You idle should be pretty much constant. Maybe with small jumps when the fan comes on or something, but it shouldn't be revving all the time. And do you think that synthetic oil would help at all?

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post #3 of 13 (permalink) Old 01-04-2004, 02:59 PM
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Sounds like you should install a new IAC, and get rid of your Fram oil filter.
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post #4 of 13 (permalink) Old 01-04-2004, 03:43 PM
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I'd try switching to the recommended 5W30 for faster lube-up. Ford even recommends 0W20 now. I'd also recommend synthetic.

John

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post #5 of 13 (permalink) Old 01-04-2004, 03:54 PM
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Quote:
Originally posted by johnaec
Ford even recommends 0W20 now.
for gas mileage.....what about engine mileage?

5w30 or 10w30 in summer/hot climates.

Make sure the oil filter has an anti-drain back valve, which is what Justin was reffering to.




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post #6 of 13 (permalink) Old 01-04-2004, 03:57 PM Thread Starter
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Got a Wix filter, no Frams here. The idle is that typical 1200 rpm for the first couple of minutes when cold, also the typical 10 second lag after higher RPM for it to return to normal idle rpm. It's not constant. Thinner oil could be a possibility. I would like to know the percentage of 4.6's that dry knock. That would let me know if I've got a potentially overclearanced rod journal.
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post #7 of 13 (permalink) Old 01-04-2004, 04:00 PM Thread Starter
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Greenbird, 56k miles on it.
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post #8 of 13 (permalink) Old 01-04-2004, 04:41 PM
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Quote:
Originally posted by GreenBird


for gas mileage.....what about engine mileage?

Amsoil 0W20 synthetic actually has better wear characteristics than their 5W30 synthetic, which has better wear characteristics than Mobil 1 5W30 synthetic. I don't know about Mobil 0W20 synthetic.

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post #9 of 13 (permalink) Old 01-04-2004, 05:41 PM
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Hmm, I only get it when I frst start her after an oil and filter change...using Mobil 1 10W30 and a Bosch oil filter.
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post #10 of 13 (permalink) Old 01-04-2004, 05:57 PM
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Quote:
Originally posted by johnaec
Amsoil 0W20 synthetic actually has better wear characteristics than their 5W30 synthetic, which has better wear characteristics than Mobil 1 5W30 synthetic. I don't know about Mobil 0W20 synthetic.
Actually, I double checked and that should have stated Amsoil 0W30. Also, Mobil 1 makes a 0W30, but according to ASTM D4172 tests, it has pretty poor wear characteristics: http://www.amsoil.com/lit/g1283.pdf

Note - the above doc is at Amsoil's site - I myself would like to see something more independent.

That said, I'm currently running Amsoil 5W30 synthetic in my Mark VIII and Mobil 1 5W30 synthetic in my T-Bird. 'Can't really tell much difference, even from the switch from Mobil 1 to Amsoil in the Mark.

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post #11 of 13 (permalink) Old 01-04-2004, 07:01 PM
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how's ford's oil filter?
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post #12 of 13 (permalink) Old 01-04-2004, 07:35 PM
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My 90 with the 3.8 does that. It has 125k miles on it though. I am using Mobil 1 5w30 and the proper Motorcraft filter. I think(like 99% sure) that they have an anti drainback.
Annoying as hell and doesn't do it in the summer or if the temp is over 60 out. It can't be a good thing regardless.

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post #13 of 13 (permalink) Old 01-04-2004, 08:22 PM Thread Starter
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I don't think it's a lubricity as much as an oil pressure issue.
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