Ranger-Forums - The Ultimate Ford Ranger Resource

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- 2.3L & 2.5L I4 Tech (https://www.ranger-forums.com/2-3l-2-5l-i4-tech-31/)

- - Knocking noise (https://www.ranger-forums.com/2-3l-2-5l-i4-tech-31/knocking-noise-155577/)

mmaseda

Oct 4, 2018 01:01 AM

Knocking noise

i have a 2011 Ranger with the 4 cylinder engine. It has only 25K miles and runs fine. The only problem is when I idle at a stop sign I hear a knocking noise. Kinda sounds like a diesel engine idleing. I don’t seem to hear anything while driving, only while stopped. If I open the hood and I don’t hear anything but if I stick my head under the front of the car I can hear the noise. Any ideas? Possibly an exhaust system leak?

Bonexsam

Nov 30, 2018 06:16 AM

Didn't think they made a 2.5L in 2011....

mmaseda

Nov 30, 2018 08:19 AM

Your right. It’s a 2.3L.

Bonexsam

Nov 30, 2018 09:16 AM

Well since the vehicle is a 2011 and I'm sure you're smart enough to keep the oil full and changed regularly. I'm going to rule out a spun crank bearing.

My guess is you have a misfire.

my guess without seeing it...
one of your spark plugs isn't burning all the fuel at idle.

when was the last time you changed the plugs?

also does the engine shake when it's making that noise?

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