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Idle too high

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Idle too high

Postby tmo1972 » Mon Dec 27, 2010 8:00 pm

I have noticed the idle speed stays around 1500 rpm even when warmed up. The only way to get it to drop back to normal is to stop and restart the engine. It runs fine otherwise.
Any ideas what might be causing this?
tmo1972
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Postby Rhinoman » Mon Dec 27, 2010 11:46 pm

Badly ajusted TPS, air leak, could be a few things, what year and which engine?
2000 4u2 Vitara, Calmini 3+3, 5:83s, winch bumper, 33 MTs, remapped ECU.
2000 Baleno 1.6 GS
1986 SJ413K pickup, 1.6 16V
Rhinoman
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Location: Brinkworth, Wilts

Postby tmo1972 » Fri Feb 04, 2011 9:26 am

Hi. Sorry for such a late reply!

It's a 1.6 1998 Baleno (saloon model with the factory body kit)

The idle control valve is bolted to the TB and is the crazy electromagnetic and coil spring type control.

I actually took the IAC apart (expecting the coil spring to fly out never to be seen again) but actually, there is no physical link between the IAC valve (round thing with a magnet on one end that goes into the electromagnetic coil) - so I'm not sure how on earth it works?

As I said - if I momentarily switch off the engine and turn it back on - the idle returns to normal.

Is there supposed to be a physical connection between the valve and coil spring?
Maybe this is my problem.
tmo1972
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Postby Rhinoman » Fri Feb 04, 2011 10:16 am

I expect that the magnetic force pushes the valve one way and the spring force returns it. I haven't had my IAC apart, do you have any photos?
2000 4u2 Vitara, Calmini 3+3, 5:83s, winch bumper, 33 MTs, remapped ECU.
2000 Baleno 1.6 GS
1986 SJ413K pickup, 1.6 16V
Rhinoman
Enthusiast
 
Posts: 679
Joined: Sun Jul 15, 2007 8:36 pm
Location: Brinkworth, Wilts

Postby tmo1972 » Mon Apr 04, 2011 11:54 am

Just to close this off - I managed to fix my problem by taking the IAC apart and giving it a thorough clean.
First thing to note, there is no bi-metallic spring of any kind inside the IAC valve. I can only assume this was an old design that has now been done away with. The only thing controlling the valve is the electromagnetic black coil (with the 3 pin plug)
To get the IAC apart, I had to drill a hole in the end of it...
Image

This then allows you to tap the valve out with a small nail and hammer. I used a stubby self tapping screw to seal the hole back up.
Image

All I did is clean it up and press it all back together again.
Some more pics - sorry about the quality.

Image
Image
Image
tmo1972
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