What does an engine knock actually sound like? - Ranger-Forums - The Ultimate Ford Ranger Resource


2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

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Old 02-23-2007
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What does an engine knock actually sound like?

I know that a bad engine knock sounds like, but im unsure about that it sounds like in the beginning. The only engine i have killed was a chevy 305 and it went from fine to BANG BANG BANG and shortly there after when reving it, it through a rod throught the block (it was a souped up camaro). My engine i noticed has a small almost tick to it, Im pretty sure its not the pcv valve. But to the question does a knock always sound heavy, or can it start as a light tick and became a horrible heavy knock?? Also if my engine is goin bad shouldnt there be metal in the oil?? Must i drain the oil from the pan or will there be some on the oil on the dip stick??
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Old 02-23-2007
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Kinda like this.....
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Old 02-23-2007
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It's probably a valve or some other component in the valve train. Pull the valve cover off and check out the HLA's. If one is fouled, you'll probably be able to see a visual anomaly like wear marks.

How rapid is the ticking? Is it with each revolution of the engine? Does it do it constantly, or only at certain RPM's?
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Old 02-24-2007
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it happens no matter what the rpms are and with every revolution, im also thinking it might be timeing or pug related, i noticed this mouring that when the car sits at idle for a while (2-3 minutes) i feel a cylinder miss??(it feels like it is gonna die for just a split second and then picks back up) so im assuming that that has something to do with it but i could be wrong. i just started noticeing all these things because it the first time sense ive owned the truck that i havent had to have th eheater on full blast.
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Old 02-27-2007
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yea, i hate hearing taps.... it annoys the crap outa me

well.... if it's any consolation.. if its a rod knockin, the harder you drive it the louder it should get

otherwise i would think its a valve tapppin.... i know mines got a pretty loud tick/tap

i also found the fan makes a nice tickin sound consistantly too
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Old 03-12-2007
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My ranger mis-fired on occasion and it turned out that one of the spark plug leads was grounding out to the block rather than through the plug. As far as the knocking, a loose timing belt will make a very similar sound if the belt slaps the side. On my truck (without A/C or power steering ) I can check the tension simply by removing the timing belt cover, keeping the radiator and everything else intact. Once I correctly tensioned it, it stopped making the noise.

Cheers,
Craig
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