I-6 knocks loud after sitting
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Senior User
Joined: Jun 2004
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I-6 knocks loud after sitting
i have a 1994 f150 with a I-6 with about 55,000 mi. it has been sitting for about the last 5 days. i started it today and the engine knocked loud for a couple minutes. i have mobil 1 10w-30 full synthetic oil in it. the low temps. this week have been around -5 to 5 and the highs have been about 10 to 20 and the wind has been blowing hard for a couple days. does anyone elses I-6 do this after it has been sitting in the cold for a few days? also, do any of you use 5w-30 synthetic in your truck for cold weather?
Posting Guru
Joined: Jun 1999
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I've owned five F100's/150s' since 69, all with the 300 I6 and what you describe is normal. If it bothers you, install an anti-drain back oil filter so it doesn't have to sump dino juice all the way from the bottom of the pan when it starts up. If it doesn't stop knocking after a few moments...then that's another story.
Junior User
Joined: Dec 2004
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tmcalavy, Almost all name brand oil filters (fram, penzoil, wix, napa, carquest, supertech, stp, etc...) have anti drain backs built into them. I highly doubt his filter is without one, unless it is from a plain white box with no writting with china stamped on the filter and costs 34 cents.
fordtruck88, 5w30 is perfect for the winter, most normal vehicles run 5w30 year round.
fordtruck88, 5w30 is perfect for the winter, most normal vehicles run 5w30 year round.
Senior User
Joined: Jun 2003
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From: Tillamook, Ore
Originally Posted by Intillzah
I usually floor the accelerator for a few seconds while I am cranking the engine. But in colder weather, this is a hassle sometimes. But it does prevent dry starts...
Posting Guru
Joined: Nov 2004
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From: N. Gwinnett Co. Georgia
In a fuel injected system "flooring" your accelerator would not have much in the way of profitable results. If the knock stops in a few seconds, it's fine. Floor it and you rin the risk of spinning a bearing (note: not a cheap fix). One method is to buy an aftermarket block heater, like the diesels. With the extremes in your temperature area, you would benefit greatly from a warm block to start with. An old trick used very successfully (as long as there are no gas leaks, I'm sure) is to place a 100w drop light under the hood overnight, you'd be surprised the amount of heat it puts out. As long as the shield is on and it's in a safe place, it will do wonders. I used heat tape and made my own during my one (and only one) winter in Montana. Worked very well and is still on the block. Used heat shrink tubing to cover spliced attachment male plug which I can pull out through the grill.
Tex
Tex
Cross-Country
Joined: Aug 2002
Posts: 75
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From: Pennsylvania
I've heard the same knocking sound from my 93 F150 I6. My father, who's a mechanic, told me this was normal. He said the main bearings tend to make some noise until the oil pressure is up. As far as oil filters go...if I use a $3 Fram filter, I hear that noise. However, if I use Fram's $10 filter w/anti drain back, I don't hear the noise. I also usually change from Mobile Synthetic 10W-30 to 0W-30 when the temp goes below freezing.
