High revs on valver

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greendale65
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High revs on valver

Post by greendale65 » Thu Jun 02, 2016 11:57 am

Hello all, I'm still getting high revs sometimes as much as 3000 rpm
got to sort this out can anyone give me a clue to fix.
I have changed the idle control valve also
the flow meter still the same.
thanks.
:? :?

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Re: High revs on valver

Post by rutter123 » Thu Jun 02, 2016 12:03 pm

Is this all the time or on cold start or intermittent?
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Re: High revs on valver

Post by RobC » Thu Jun 02, 2016 2:49 pm

I get this on my valver too, when it's hot. Think it's a sticky throttle position sensor/switch. A quick blap on the pedal gets the revs to settle down.

Minor adjustment may be needed to the throttle cable stop to ensure that the throttle position switch is activating (you can hear a click if you listen closely when activating it by hand), also consider removing, cleaning, and lubricating the throttle butterfly etc.
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Re: High revs on valver

Post by themildbunch » Thu Jun 02, 2016 3:38 pm

also worth checking the butterfly springs.. they can break causing a high idle...
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Re: High revs on valver

Post by greendale65 » Thu Jun 02, 2016 4:11 pm

Hello all, It goes on high revs when I start the car and tkes some time to settle down.

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Re: High revs on valver

Post by rutter123 » Thu Jun 02, 2016 5:12 pm

Air leak between throttle body and airflow meter, check hoses for cracks and breathers are all tight, with engine running on slow idle spray carb cleaner around the hoses/intake/breathers etc when revs go up you have found your leak.
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Re: High revs on valver

Post by greendale65 » Thu Jun 02, 2016 5:37 pm

Ok, Thanks will do tomoz,
will post if ok.
thanks.

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Re: High revs on valver

Post by MULLEY » Thu Jun 02, 2016 11:12 pm

I had a broken wire on the plug that goes into the afm, that helped mine reduces the idle revs :)
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Re: High revs on valver

Post by greendale65 » Fri Jun 03, 2016 8:53 am

Ok I don't hear that click where do I get a throttle sensor switch.

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Post by jamescarruthers » Fri Jun 03, 2016 9:40 am

Try ignitioncarparts.co.uk. They were significantly cheaper for the 480's TPS. Also, before you replace, try setting it up correctly. Can someone elaborate on if the BX system TPS setup procedure?

Having set up a 480's years ago, it was just loosening two nuts and rotating until set right (click when throttle closed) then locking off the nuts and verifying the other switch (inside TPS) worked at full throttle.
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Re: High revs on valver

Post by greendale65 » Fri Jun 03, 2016 9:49 am

Ok, Thanks for help have something to go on now.

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Re: High revs on valver

Post by RobC » Fri Jun 03, 2016 1:14 pm

Don't go throwing money at a new switch just yet. The switch may well be working fine - but failing to activate because the acc cable is too tight. The fact that your revs settle down after a while implies that it does work, but perhaps doesn't get activated as often as it should. It's quite a fine adjustment to get the right balance between it activating on the one hand, or on the other hand having such a slack cable that your acceleration response becomes poor.

Be methodical, go through all the advice about air leaks as well, the switch could be a total red herring.
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Re: High revs on valver

Post by greendale65 » Fri Jun 03, 2016 4:54 pm

Hi, Ok will get onto that next week wont use car to Monday
don't do much mileage these days.
will get back on sorting car.

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Re: High revs on valver

Post by greendale65 » Fri Jun 03, 2016 4:54 pm

Hi, Ok will get onto that next week wont use car to Monday
don't do much mileage these days.
will get back on sorting car.

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Re: High revs on valver

Post by rutter123 » Fri Jun 03, 2016 9:39 pm

Its unlikely the the TPS as this only tells the ECU if throttle is closed or wide open, the potentiometer on the airflow meter dials in the mixture controls etc. I would be more inclined by an air leak pre throttle body, bear in mind most of the rubber pipes will be 25 odd years old and do crack/perish, you only need the smallest leak to upset idle and cold starts.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability