Engine tapping or knocking 99 Towncar only 37k miles

90

Asked by Feb 18, 2015 at 01:58 PM about the 1999 Lincoln Town Car

Question type: Maintenance & Repair

11 Answers

7,055

Does the tapping increase with engine speed? Also is it a tap which is light or a knock which is a heavier sound? It makes a difference in what it could be.

1 out of 1 people think this is helpful.
90

Sounds more like a tapping sound rather than a knock. Doesn't get louder with speed. Different opinions from different Mechanics. One guy says "bottom knock, pull engine ", the other guy says "sounds like top tap", use Lucas Oil Treatment.

2 out of 2 people think this is helpful.
7,055

You may be just hearing the fuel injectors, if it was mechanical, the noise should increase with the speed of the engine. Does the car run rough and do you have check engine light?

90

Thanks, I'll either raise octane in fuel or add some fuel injection cleaner. Mechanically, car rides like new!

90

After applying Lucas, the tapping / ticking noise persists. No check engine, no rough ride etc. Just a ticking. How about lifters?

7,055

If it were the lifters the additive should have made some difference but If the noise is at the top of the engine i'm still thinking that it may still be injector tick, would need to hear in person to be sure.

Best Answer
90

What's the cure if it is injector ticking?

7,055

If that is what it is you can have the injectors cleaned but there is no guarantee that it will quiet them down. The injector is an electronically controlled valve that opens and closes with an injector pulse.

1 out of 1 people think this is helpful.
90

Sorry for responding late. Thank you for your help! Tapping, ticking still persists yet car gets 26mpg hwy. Sound doesn't increase, now car has been driven 43k miles. Driving me nuts.

Pull valve cover off on the side in question, find the oil restricter on right side of the head, you have to remove the latter frame over the cam journals to find it, but 4.6 intech sate notorious for small pieces of gaskets to lodge in the oil restricter causing the valves to tick...Lucas will quiet the problem but only because it makes it easier for oil to pass through the blockage...This is a common issue with the dohc 4.6.

Oh and the oil restricter pulls out with some pliers and elbow grease. You can even google 4.6 oil restricter and find a YouTube video to give you a better picture of what I'm talking about

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