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Ive got a focus st170 and about 4000 revs it seems to missfire

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  • cebcsb Oct 27, 2008

    my focus seems to have the same problem but when i drive it ,it holds back at 4000revs and i can rev past 4000revs in nautral, i was told it was mass air flow meter , so i changed that but problem still there. if you sort yours out can you let us know and ill do the same

  • Anonymous May 15, 2009

    99i

  • Anonymous Mar 16, 2014

    Engine revs perfect with a progressive throttle.It missfires badly when you open throttle quickly

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2 Answers

When i get between 3000 and 4000 when driving the car loses power and seems to misfire

Posted on Oct 20, 2008

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  If you mean in neural it misses this is normal. It has a rev limiter to save the engine. You are bouncing it off the chip at 4000 rpm.

Posted on Oct 19, 2008

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My focus st170 wont rev over 4000revs but will in nautral


Sounds like your mass air flow meter may be faulty , have you had it code read ?

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