Drive for 25- 30 mins knocks shut engine off and start back no knock what could this be help!!

 

Submitting the same thread twice is not going to provide any faster responses. Perhaps by being more specific in your description might help

 

2006 mustang GT 4.6 manual transmission. I have changed the oil and filter (Fran oil filter) Pennzoil5w20. Doesn't knock all the time just every now and then, but when it does my oil pressure is still great and I shut engine off and start right back no knocking?

 

It could be anything. Could be the engine, the transmission, clutch... You'll have to just leave it knocking and figure out where the noise is coming from first. It may need you to produce the knocking while it's on a lift. And you may need a mechanic's stethoscope or a long screwdriver up to your ear to find the loctation, depending.

To me, the disappear/reappear is something moving around. I suspect it's getting picked up and tossed about as it's running, eventually, and then when you stop the motor it stops being tossed about. It falls somewhere, then for whatever reason gets picked back up again and starts banging around in whatever cavity it's in. Maybe you got a rock in the flywheel/clutch, or a spring on the clutch busted and it's rattling around...

The other possible is a spinning bearing that somehow after the stop gets set enough to stop the noise, then gets back loose after the restart. I'm not confident in that, but I just thought about it.

It could be a lot of other things. Many spinning things going whirr in that thing y'know. More details would help, but at this point, I'm going to recommend a mechanic with a lift, if you have no way to pinpoint the area yourself. And I might be towing it to ensure less damage than driving it, but that'd be me.

Hope that helps, good luck! And welcome to the forums!

 

ur oil pump is gone.. Prematurely im sure

 

Ooh, that's not a bad point, Cali. That'd suck, but it's doable in car. Still, you'd think it'd be constant, not intermittent like that...

 

Does your car have an aftermarket performance tune? if it does, your air/fuel mixture could be running on the lean side which could cause your engine to knock. If your car does NOT have an aftermarket tune? check all vacuum lines to make certain there are no vacuum leaks. Also consider changing your fuel filter, if it's the original? Your spark plugs may also be the cause, if there the original plugs. As for the oil pump being gone? I don't agree with that for a single moment. If it were in fact the oil pump, you would have far worse problems going on other than just having an intermittent engine knock every now and then. Also you would have very little to no oil pressure. That being said, I suspect it's either a vacuum related issue or possibly fuel/timing related

 

If in fact the OP's oil pump were gone as you claim? his engine would've been severely damaged due from having no oil pressure. Knowing the OP's been running his vehicle with just an intermittent engine knock every now and then, pretty much eliminates the oil pump as being gone.. Therefore, I don't agree it's the oil pump for a single moment lol.

Unfortunately, I disagree. As mentioned above, if it were in fact the oil pump being gone? there is no way in hell the OP would be able to continue driving his vehicle for as long as he has without causing severe engine damage from having no oil pressure due to an oil pump failure.

 

How many miles are on the car OP?

 

Which is why I mentioned the intermittent thing. And stranger things have happened, but I'm in your boat: That engine would likely be toast.

Ah well. Drunk with tired on that. Meh.

 

Do knock sensors go bad? Timing chain adjusters are going?

 

Knock sensors DO go bad, but you'd probably have a code about that: https://exhaustsystemsguide.com/p0325/

Timing chain tensioners, having just gone through that nightmare, is going to likely be right side up front, and likely going to be at start up, not driving about. If it *were* the tensioners after 20-30 minutes, that'd be an oiling issue, and that engine is toast, time for a rebuild/swap.