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Author Topic: revs won't go below 1000rpm unless stopped  (Read 5581 times)

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holey head

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revs won't go below 1000rpm unless stopped
« on: 03 September 2007, 20:43:38 »
hi all

have noticed recently that when i'm driving and i dip clutch revs won't go below 1000rpm untill car has stopped moving <stopped completly> is this normal? or any ideas what problem could be so i can sort it?

cheers all

steve
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VX1

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Re: revs won't go below 1000rpm unless stopped
« Reply #1 on: 03 September 2007, 20:49:18 »
No this is not normal. Mine is doing the same thing. I have no air leaks so that can be ruled out. The leads are ok, Plugs are fine so that just leaves the IAV to be replaced but not sure.
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holey head

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Re: revs won't go below 1000rpm unless stopped
« Reply #2 on: 03 September 2007, 20:52:00 »
might take it apart and try cleaning it! if can be done?

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Re: revs won't go below 1000rpm unless stopped
« Reply #3 on: 03 September 2007, 20:59:06 »
Yes it can. Just remove the air filter trunking from the throttle body then remove the two bolts from the IAV to throttle body. Once this has been done you will see two small screw's on the IAV undo these then pull apart. Spray carb cleaner in the bottom half of the IAV give it a good clean both halves. Refitting is the reversal of removing. I have done this and it made no difference thats why I think the IACV needs replacing or the idle needs turning down. Hope this helps.

Cheers Paul :y
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Re: revs won't go below 1000rpm unless stopped
« Reply #4 on: 03 September 2007, 21:12:25 »
You can't turn the idle down, it is ecu controlled.

The problem is almost certainly going to be a vacuum/air leak or a sticking idle control valve.
The valve should be cleaned with the entire breather system (including that very small hole on the side of the throttle body).

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Abiton

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Re: revs won't go below 1000rpm unless stopped
« Reply #5 on: 03 September 2007, 21:33:14 »
Another possibility is a coolant temperature sensor that's failing and reporting a colder-than-reality temperature to the ECU.  This results in overfuelling, and revs that don't behave as expected/required.  If you rule out everything else, and the problem gets gradually worse, this could be worth checking.  Mine failed as a result of chafing/shorting between the sensor signal wire and injector wires ( :o) in the trunking along the side of the engine.  I suppose I should be glad that the ECU survived that!
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Re: revs won't go below 1000rpm unless stopped
« Reply #6 on: 03 September 2007, 21:47:34 »
Quote
You can't turn the idle down, it is ecu controlled.

The problem is almost certainly going to be a vacuum/air leak or a sticking idle control valve.
The valve should be cleaned with the entire breather system (including that very small hole on the side of the throttle body).


TB, all of this I have cleaned and replaced but still the same, except the IACV I have not replaced this yet. So this is the next thing on the list after I have replaced the steering link bar. Hopefully this is all that needs doing to make it run better.
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holey head

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Re: revs won't go below 1000rpm unless stopped
« Reply #7 on: 03 September 2007, 22:05:31 »
cheers all. cleaned breathers recently so not them! will take tb off and give it all a good clean! needs it has what looks like oil on butterfly!
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Re: revs won't go below 1000rpm unless stopped
« Reply #8 on: 04 September 2007, 09:49:21 »
Almost certain the butterfly will be sticking open.
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Marks DTM Calib

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Re: revs won't go below 1000rpm unless stopped
« Reply #9 on: 04 September 2007, 10:18:34 »
What makes you think its not normal?

Given that the 2.0 ECU setup is similar to the 1.8 and I have recently been looking at the settings on a 1.8 as a bit of a training exercise, this unit has two settable idle settings....

....one for static and one for moving.....
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Re: revs won't go below 1000rpm unless stopped
« Reply #10 on: 04 September 2007, 10:30:01 »
I tend to agree with 'Marks DTM Calib' on this.

When my car was in it's 'Stalling' era, with blocked small breather,
oiling up IACV, and intermittent Crank Sensor, the idle would drop below below
1000 rpm when in over-run (auto).

When all problems where fixed, the car ran very smoothly and idle stayed
circa 1000 rpm until speed reduced to zero, when it gently and smoothly
reduced to 750 rpm.

Exactly what you want in an auto.
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Marks DTM Calib

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Re: revs won't go below 1000rpm unless stopped
« Reply #11 on: 04 September 2007, 10:31:39 »
If somebody wants to pop a 2.0 round to me, I am more than happy to confirm this setup using tech 2
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magnul

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Re: revs won't go below 1000rpm unless stopped
« Reply #12 on: 04 September 2007, 13:16:29 »
Mine (X20XEV) is exactly the same, and I've never thought of it as not normal. It makes sense to me that the revs are kept up a bit while still moving, in case you decide not to stop after all.
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ians

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Re: revs won't go below 1000rpm unless stopped
« Reply #13 on: 04 September 2007, 13:55:17 »
Quote
I tend to agree with 'Marks DTM Calib' on this.

When my car was in it's 'Stalling' era, with blocked small breather,
oiling up IACV, and intermittent Crank Sensor, the idle would drop below below
1000 rpm when in over-run (auto).

When all problems where fixed, the car ran very smoothly and idle stayed
circa 1000 rpm until speed reduced to zero, when it gently and smoothly
reduced to 750 rpm.

Exactly what you want in an auto.

That is also how mine behaved.

Just to emphasize , its critical that the small hole/port and the small breather hose that connects to it are clear.
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holey head

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Re: revs won't go below 1000rpm unless stopped
« Reply #14 on: 04 September 2007, 15:23:37 »
cheers all. wiil try cleaning tb. is there a how 2 anywhere?
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