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Old 08-04-2013   #1
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Fast Speed causes engine light to flash

Okay, been searching on here for some answers but can't seen to find one.

I've never been on motorway before other day so I've only noticed this problem once before on a back road. When i went over 75mph my engine management flashes on and off and when i drop under 60mph it goes off again.

As I've never been on motorway before i hadn't noticed it, and people drive too slow on normal roads to get fast enough, only had it once before like i said.

I'm thinking it might be the fuel filter, it's the only thing on my car that isn't new! I'm thinking its clogged up and not letting enough fuel in when the cars needing it.

Anyone think this or got any ideas?
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Old 08-04-2013   #2
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Re: Fast Speed causes engine light to flash

Sticking to UK speed limit would stop it

Although back on topic ideally you need to get the code read
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Old 08-04-2013   #3
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Re: Fast Speed causes engine light to flash

Get the codes read. Extremely unlikely to be the fuel filter on a Mk2 as it's a non service item.
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Old 08-04-2013   #4
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Re: Fast Speed causes engine light to flash

my bet is on a arcing HT lead or a HT lead breaking down under heavy load

Does it seem to present a problem when revving higher in lower gears?

But the best way about this is a fault code read

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Old 08-04-2013   #5
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Re: Fast Speed causes engine light to flash

would no one consider the cam sensor is reading different to the crank sensor then
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Old 08-04-2013   #6
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Re: Fast Speed causes engine light to flash

Quote Originally Posted by s and b View Post
would no one consider the cam sensor is reading different to the crank sensor then
implying the timing is slipping / timing is incorrect

But surly if thats the case, the same results from doing speed in a higher gear will be replicated from been in a lower gear and revving at the same RPM?

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Old 08-04-2013   #7
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Re: Fast Speed causes engine light to flash

My dads got one of those computers to read codes so hes gona check, but all the HT leads are brand new and checked, its not having the same problem when its revving high in low gears, and all the cam shaft is brand new and had timing belt just done.
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Old 08-04-2013   #8
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Re: Fast Speed causes engine light to flash

Quote Originally Posted by s and b View Post
would no one consider the cam sensor is reading different to the crank sensor then
90% there.

If the self adaptive parameters aren't reset after disturbing the cambelt, and the phonic wheel learn performed (cam and crank sensor sync), then the engine management will detect a false generic misfire at 3k+ in higher gears- ie motorway driving.

Even if the belt lines-up perfectly on it's timing marks, there's a subtle difference in where the ECU expects the signals to be every time the belt is slackened and retightened. A misfire event causes the two signals to be slightly out from what the ECU knows is correct, so it flags up the error, and if it repeatedly happens on the same part of the ignition cycle, it works out on which cylinder the fault is present.


This is one of those common faults which crops up repeatedly on the forum.
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Old 09-04-2013   #9
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Re: Fast Speed causes engine light to flash

How do you solve thia problem?
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Old 09-04-2013   #10
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Re: Fast Speed causes engine light to flash

As in how do you reset the parameters?
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Old 09-04-2013   #11
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Re: Fast Speed causes engine light to flash

With a diagnostic machine/software that's equivalent to Fiat's Examiner.
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