Knocking noise

RL.WASSON

MEMBER
1986 FORD F-150
250,000 MILES

Knocking noise coming from engine and then shutting off.

Wednesday, May 17th, 2017 AT 6:57 AM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

This is not very good description is oil pressure low does noise sound like top or bottom, what engine is it? Have you tried shorting cylinders out by removing plug wire to see which cylinder?

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Wednesday, May 17th, 2017 AT 7:12 AM

RL.WASSON

MEMBER
2 POSTS

Sorry it is my dads truck and he is not very descriptive. Just trying to help him. He was in the driveway and started it and the truck made a loud knocking noise and I asked where he thought it was coming from and he said the engine. He thought it could be bad gas because that has happened before but when trying to get to the gas station it shut off. He has not tried removing the plug wires but I will ask him to do so.

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Wednesday, May 17th, 2017 AT 7:23 AM

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

Hello,

It sounds like you may have an internal engine problem which can be found by doing a compression test. It could have a blown head gasket between two cylinders causing the problem.

Here is a guide to help us figure the problem out.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us so we can continue helping you.

Cheers, Ken

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Friday, May 19th, 2017 AT 1:01 PM