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Cosworth high reving

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Old 28-04-2007, 07:31 PM
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Trist
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Default Cosworth high reving

My father in law's sapph cosworth 4x4 has been sat for about a year, he has just done cam belt oil pump plugs and all other belts.

he started it up earlier and left it till the fans cut in and all was fine, but when he went to re start it about half hour later it was reving at 3kRPM?? Any ideas??
Old 28-04-2007, 07:36 PM
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KSA-Cossie
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Clean out iscv.
Old 28-04-2007, 07:56 PM
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rapidcossie
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I had water in my TPS after a jet wash and it showed similar symptoms
Old 28-04-2007, 08:02 PM
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Jasesapphy
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or air leak in the inlet somwhere
Old 28-04-2007, 08:06 PM
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unplug the idle speed control valve and see if the revs drop,if so then it needs drying/cleaning. then plugging back in obviously lol!
Old 28-04-2007, 09:03 PM
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tabetha
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Has he just done a fuel filter change ?
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Old 28-04-2007, 09:06 PM
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If you are cleaning the ISCV use ITG air filter cleaner, works a treat!

Make sure its dry before putting it back though!
Old 29-04-2007, 10:38 AM
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Or carb cleaner.
Old 29-04-2007, 11:00 AM
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the revs did drop when I took the ISCV plug off so will get it cleaned and dry and give that a go cheers for the help
tabetha
he has not changed that yet but is planning to do so.
Old 29-04-2007, 11:07 AM
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idel control vavle
Old 29-04-2007, 11:38 AM
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Originally Posted by Trist
the revs did drop when I took the ISCV plug off so will get it cleaned and dry and give that a go cheers for the help
tabetha
he has not changed that yet but is planning to do so.

Nice easy fix.
Old 29-04-2007, 12:11 PM
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2saffs
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My 4x4 saff did the same thing, i removed and cleaned the iscv with carb cleaner but the problem came back after a few starts, in the end i put it in an ultrasonic bath, has been right as rain since
Old 29-04-2007, 02:24 PM
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davidreader5
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Iscv, Throttle switch, or vacuum leak.


Regards Dave R.
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