My T-bird started a scary knock yesterday. It is only at a very low rpm, as when the car is idling in gear.
In Park, the knock ends as the engine increases a bit in RPM...or in gear, when RPMs increase, the knock ends.
And when I say it ends, I mean it ends. You can stick your head alongside the engine at the low-idle and the knock is scary...but rev up a little, or place it in park, and you can't hear a THING.
The engine was rebuilt 1700 miles ago, but unfortunately that 1700 miles was also about 9 years ago. The car was a very occasional Sunday-driver until I decided to grab it and turn it into a daily driver.
I have changed the oil and filter, and tried the Seafoam additive (Which I don't have much faith in, anyway, but tried as this was a strange knock) but it hasn't slowed it down.
I have had rods/rod-bearings and mains go bad before, but I have never had a situation where the knock disappears completely with just a touch of a higher RPM.
* Does not knock when cold at all
* Begins when car is warm and at a low-idle. I can leave it in park and idle it down and it begins, or I can have idle set normally, place car in Drive or Reverse and the knock begins.
* Knock completely ends with RPM increase.
Anyone have any experience with this? My first guess is that the oil-pump is not working properly at the low-idle, but I don't have a gauge. (And I believe more than one rod would be knocking were that the case, and this sounds like a single booger, not multiple) Engine-oil light functions properly and does not come on or blink, etc.
My second guess is a rod knocking, but I have no prior experience with rod-knocks being temperamental...they pretty-much knock or don't knock.
The knock seems in-time with the engine idle and not a fast knock...if I had to choose between a rod, main, or lifter, I'd choose rod because of the degree of noise and the speed of the knock.
It is just weird that is completely goes away with the slightest idle increase.
Ideas?
In Park, the knock ends as the engine increases a bit in RPM...or in gear, when RPMs increase, the knock ends.
And when I say it ends, I mean it ends. You can stick your head alongside the engine at the low-idle and the knock is scary...but rev up a little, or place it in park, and you can't hear a THING.
The engine was rebuilt 1700 miles ago, but unfortunately that 1700 miles was also about 9 years ago. The car was a very occasional Sunday-driver until I decided to grab it and turn it into a daily driver.
I have changed the oil and filter, and tried the Seafoam additive (Which I don't have much faith in, anyway, but tried as this was a strange knock) but it hasn't slowed it down.
I have had rods/rod-bearings and mains go bad before, but I have never had a situation where the knock disappears completely with just a touch of a higher RPM.
* Does not knock when cold at all
* Begins when car is warm and at a low-idle. I can leave it in park and idle it down and it begins, or I can have idle set normally, place car in Drive or Reverse and the knock begins.
* Knock completely ends with RPM increase.
Anyone have any experience with this? My first guess is that the oil-pump is not working properly at the low-idle, but I don't have a gauge. (And I believe more than one rod would be knocking were that the case, and this sounds like a single booger, not multiple) Engine-oil light functions properly and does not come on or blink, etc.
My second guess is a rod knocking, but I have no prior experience with rod-knocks being temperamental...they pretty-much knock or don't knock.
The knock seems in-time with the engine idle and not a fast knock...if I had to choose between a rod, main, or lifter, I'd choose rod because of the degree of noise and the speed of the knock.
It is just weird that is completely goes away with the slightest idle increase.
Ideas?
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