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nds111

Ford S-Max 2.5T Misfire

14 posts in this topic

Hi,

I have a 07 57k 2.5t S-max that misfires in 3rd and 4th gear between 2000-2500rpm. 1st and 2nd gear are ok, but it judders badly if you put your foot down in 3rd or 4th. If you are very gentle its not noticeable.

I have had the car serviced and spark plugs changed to see if it cured it. The ECU has also been reset. It is not reading any error codes.

The car is standard but I was wondering if anyone else has come across this in a petrol S-max.

Any help or advice would be great.

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have you had the fuel filter changed?

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No not yet. Apparently the filter on this engine doesn't need to be changed.

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a guess, tps?

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drive it like you stole it.

then see if it still misbehaves?

are you doing a lot of short journeys?

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I've tried thrashing it for a short while but made no difference. It revs ok after about 2700 rpm-. I've just got the car and I think it was used for a lot of short journeys previously.

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Volvos used to have troubles with a similar problem and it turned out the throttle required recalibrating. we'd plug it in to VIDA, Volvos diagnostic machine and in there we would recalibrate the throttle. what it would do is open and close the throttle butterfly several times. if it passed the car would go back to the customer, if it failed... i dont know what happened next as everyone i did passed.

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have you had the fuel filter changed?

No not yet. Apparently the filter on this engine doesn't need to be changed.

That's because the petrol S-max don't have a fuel filter fitted it's only the diesel's have them fitted

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BCS & MAP sensor faults are quite common on the 2.5T and cause this issue.

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Thanks.I took it to Ford today and they have relieved me of £180 and diagnosed the boost solenoid as the problem. Going to get an independent volvo specialist to replace it tomorrow for £95 - Ford quoted £155.

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Boost control solenoids = BCS. As I said above.

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Exactly. I read other people have had problems with the MAF sensor as well. Hopefully it will be sorted with a new BCS valve.

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Yup. Driving perfectly now. Thanks

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