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  Soarer Central * Mechanical - V8 * Unstable idle when warm fixed - IACV rebuild Previous Previous    Next Next  

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Matt Petersen
DieHard
New Zealand
V8

Posts: 948
Reg: 01-2008

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Thursday, June 07, 2012 - 01:25 pm, by:  Matt Petersen (Mattmannz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

After doing the starter on my 1UZ about a year ago the idle was slightly erractic at idle once warm.

Once the engine had warmed up at idle in drive the rpm's would fluctuate between 500 and 600 every now and then and it sounded like it had a hot cam with a mild lope.

I assumed that one of the gaskets I had reused was leaking a bit and didn't worry about it too much. It slowly got worse about a few months ago and started stalling ocassionally which was very annoying.

Did some research and it seemed like it could well be the idle control valve, certainly easier than doing all the intake and injector gaskets/seals.

I got the bearings from Saeco in Petone, cost me $40 for both. Neither Repco or BNT stocked them.

I used the writeup on Planet Soarer as the guide and just removed the black section of the IACV.

To do this I had to remove the intake tubing, plug/leads covers, front coil, and the cross over section for the leads between the dizzy's.

Unscrewed the black housing and pulled it away and disassembled it. The bearings were dry but the culript was clearly a dirty and sticking shaft that is supposed to wind in and out.

I gave this a thorough clean fitted new bearings to the magnet component and reassembled it. To get the larger bearing off I clamped the bearing lightly in a vice and used a drift the same size as the inner shaft and gently tapped it out. The smaller bearing was easily tapped out.

After refitting and going for a drive the idle is much better, gone is the loping and erraticness and sometimes stalling.

All up took me about 2 hours from whoa to go including clean up and test drive and $40.

Matt

http://www.planetsoarer.com/IAC/iac.htm
Wayne Womersley
TryHard
Victoria
Soarer V8

Posts: 229
Reg: 12-2011

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Thursday, June 07, 2012 - 01:41 pm, by:  Wayne Womersley (A49kidx) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Great bit of information Matt. I'm sure it will be helpful to many people.
Well done, and you fixed your problem.
Daniel Marshall
TryHard
QLD
V8 UZZ31 X2

Posts: 137
Reg: 07-2011

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Saturday, June 30, 2012 - 11:43 am, by:  Daniel Marshall (Ydass) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Did you regrease the threaded shaft? Or just antisieze?
I'm about to do this to my spare one and wasn't shore about greasing threaded shaft
Dave van Staveren
TryHard
South Australia
Soarer Limited coupe Supercharged V8

Posts: 216
Reg: 03-2011

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Saturday, May 18, 2013 - 10:06 pm, by:  Dave van Staveren (Deveous) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey Daniel, old thread i know but ive been having idle issues and a high pitched whistle/scream when cold, stops when temp reaches halfway then the idle does the whole lumpy cam thing. I am guessing it is caused by, and coming from the IACV. It started as soon as i changed intake manifold and had to relocate the IACV So this is my job for tomorrow, already have the bearings, $16 from CBC... Did you end up greasing up the shaft??? Thats my plan at the moment...
Kush Chaudhary
Newbie
Queensland
1UZ 5spd Manual

Posts: 3
Reg: 07-2013

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Tuesday, July 16, 2013 - 06:36 pm, by:  Kush Chaudhary (1uz_hilux) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey Dave, you wouldn't have the part number for the bearings? Also what store are they from? I'm in Brisbane and doing my IACV tomorrow so might as well put new bearings in
Kush Chaudhary
Newbie
Queensland
1UZ 5spd Manual

Posts: 4
Reg: 07-2013

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Wednesday, July 17, 2013 - 10:34 am, by:  Kush Chaudhary (1uz_hilux) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Was digging up some more info re the IACV rebuild/greasing and have read that people use molybdenum grease on the shaft
Dave van Staveren
TryHard
South Australia
Soarer Limited coupe Supercharged V8

Posts: 224
Reg: 03-2011

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Wednesday, July 17, 2013 - 09:40 pm, by:  Dave van Staveren (Deveous) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah mate. The numbers are 6902V and 608V. Any bearing place sells them. Got the numbers from this thread...
http://planetsoarer.com/IAC/iac.htm
Rob Charles
Tinkerer
Victoria
v8

Posts: 10
Reg: 07-2014

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Thursday, July 24, 2014 - 03:57 pm, by:  Rob Charles (Pearl_white) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I had to get a rubber bearing in place of the smaller on as the shop didn't stock the above.

I will post part number later.
Rob Charles
Tinkerer
Victoria
v8

Posts: 17
Reg: 07-2014

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Tuesday, July 29, 2014 - 12:40 pm, by:  Rob Charles (Pearl_white) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

2 bearings i got were:


608 ZZ
6902 2RS
Total cost of $12.80 from bearing warehouse in Sunshine, Vic.

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