2011 rough idle

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09-15-2018, 04:06 PM

Jcrowsom

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2011 rough idle

Hello everyone,

I just bought a 2011 MCS with the JW tune that has 77k miles. I have had the car for about 2 weeks, everything has been running smoothly and all of a sudden the check engine light came on yesterday and the idle started bouncing between .5 and about 1.2. I did the check list and the low fuel warning was shown, although I have about a 1/4 of a tank of gas left. I am guessing the cause may be the HPFP, but hoping not since as new one was installed 4k miles ago. I have ordered a ODB-II scanner which will be here tomorrow. Any words of wisdom offered would be awesome.

Thank you

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09-16-2018, 06:10 PM

thebombardier

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Rough idle is usually going to be either fuel or spark. If you scan the codes and get a multiple cylinder misfire and/or low fuel rail pressure codes, probably HPFP. Otherwise single isolated cylinder misfire is probably a bad spark plug or coil pack.

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09-16-2018, 06:53 PM

Jcrowsom

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Thank you for responding. I got the code, looked under the hood and noticed the air intake hose was cracked and disconnected at the turbo, the turbo the dealership installed about 8. I followed the intake up to the filter to find the filter box was only attached with the one screw and the other rubber grommets were missing. Anyway, I ripped everything out and I am searching for a new air intake setup.

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