Can a worn timing chain cause a sound that sounds like a rod knock?
My 2000 ford ranger with a 3.0L flex fuel started having a valve tick. That tick disappeared and a knock developed. However, when the engine gets warmed up, there's a loud tapping on the timing chain cover. The knock isn't consistent. It just goes knock knock knock and then goes away for a moment, then comes back. At 2500 rpms, the knocking disappears and a ticking noise develops. I have listened and the knock is coming from cylinder 1. That is also where the valve ticking was located. It also misses very badly and when you pull of the plug wire on cylinder 1, it knocks like crazy! What do you think? Bad rod bearings, bad timing chain, vacuum leak, or valve lifter issues? Its also a OHV engine. I need some help with this please, any ideas, opinions, or answers of any kind would be appreciated.
The timing chain does not produce the knock. It is the lifters and rods that make the knock/ticking noise. Your knock is worse when you remove the wire, because the cylinder is no longer firing. On a 4Cyl it is very pronounced, but should not be as bad on v6l engines, like yours.
I would recommend having a mechanic look at it. Ensure the coil packs are working properly. When they start to fail, you will start to lose fuel economy and performance, start to miss, ping and can cause both engine and transmission issues.
Your timing chain should have been replaced once already, and may be due for a second time, depending on mileage. Check your maintenance records and scheduled maintenance recommendations in your owner manual.
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