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2016 Ford Focus RS
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Discussion Starter · #3 ·
What gear were you in? Is your car tuned? Have you checked for any loose piping?
I haven't checked any of that yet, thats my next move, I'm away from home right now that's why I haven't looked. No tune. Stock. Intercooler. Mountune recirc valve, does it in every gear except 1st and 2nd
 

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So I've noticed my car recently after like 4k rpms under wot has a boost issue, ill leave a link to the video, the boost fluctuates from like 17 to 13 back and forth a lot. Doesn't seem good. Anyone have any ideas?
My car does this too. I thought it may be a boost leak because I have a mountune B7 kit which comes with a 91 octane tune. When I put the stock tune back on I noticed it dosent do it. So im kinda lost.
 

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Could be the boost control solenoid as well
 

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2016 RS
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If you can, verify that all boost control hoses are correctly routed and pull the terminal off the battery for 10 minutes or so and do a battery monitoring reset as-well. Some issues with these cars come around because of the battery being funny.

If you had a boost leak it would be a very distinct whistling, not that kind of fluctuation of boost pressure.
 

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My car does this too. I thought it may be a boost leak because I have a mountune B7 kit which comes with a 91 octane tune. When I put the stock tune back on I noticed it dosent do it. So im kinda lost.
If the car is not dialed in with custom tuning, then this is very likely to happen. Let me know if you need help with that.
 

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Discussion Starter · #17 ·
If you can, verify that all boost control hoses are correctly routed and pull the terminal off the battery for 10 minutes or so and do a battery monitoring reset as-well. Some issues with these cars come around because of the battery being funny.

If you had a boost leak it would be a very distinct whistling, not that kind of fluctuation of boost pressure.
I just got a check engine light for p0420 bad catalytic converter, which was replaced at 78k, car has a new motor now, maybe the cat is clogged? I've got a catless downpipe
 

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Do you do custom tuning? And how does it work. I am still kind of new when it comes to tunes. Thank u
he's the most experienced tuner on our ford ecu's. also very easy/friendly to work with. will explain details and answer questions...as other tuners may not have the patience to.
i've been running his tunes for 60k miles now. zero issues. just solid performance.
you will need a cobb access port and a laptop to transfer data through email. also a 1/2 mile smooth/flat open road.
 
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