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Author Topic: wont rev past 4000 rpm when warm?  (Read 1077 times)

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dispondent 1

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wont rev past 4000 rpm when warm?
« on: 14 December 2008, 12:48:59 »
hi all ,
got a bit ov a problem! car starts and idles fine , car runs right through rev range performs well , untill temp guage moves up to normal operating tenp then its fine up till about 4000 rpm and then missfires badly will not rev past 4000+/-2/300rpm its ok as 4000 in fifth is 85/90 mphbut i would like to sort it as its not right!
any help would be much appreciated ! bob.
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benbrunt

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Re: wont rev past 4000 rpm when warm?
« Reply #1 on: 14 December 2008, 13:05:37 »
Is the engine management light coming on when it does this?
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dispondent 1

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Re: wont rev past 4000 rpm when warm?
« Reply #2 on: 14 December 2008, 13:19:26 »
no all the lights stay out as usual. and drives perfect untill that rev range!
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Elite Pete

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Re: wont rev past 4000 rpm when warm?
« Reply #3 on: 14 December 2008, 13:36:57 »
I would do the paperclip test to see if any codes have been stored

http://www.omegaowners.com/forum/YaBB.pl?num=1189022687
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dispondent 1

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Re: wont rev past 4000 rpm when warm?
« Reply #4 on: 15 December 2008, 03:58:39 »
thats not true the eml does come on ! i booted the thing tonight and held me foot down and yes eml comes on. :-? thanks pete i will do the paper clip thing when i can find where to stick it !
« Last Edit: 15 December 2008, 04:00:38 by dispondent »
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Robin Hood

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Re: wont rev past 4000 rpm when warm?
« Reply #5 on: 15 December 2008, 08:12:36 »
Could it be vacuum pipe related.  One of the multi-ram actuators kicks in at about 4000rpm?
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Marks DTM Calib

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Re: wont rev past 4000 rpm when warm?
« Reply #6 on: 15 December 2008, 08:27:00 »
Wont be vac related.

There are one or two sensors which will kick in the 4000rpm limit e.g cam sensor (although I have only ever seen them damaged and not failed), knock sensor (again, only seen the wries damaged).

Blocked fuel filter can cause a similar symptom to.

« Last Edit: 15 December 2008, 08:27:25 by Mark »
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