I was working on the 3dr this weekend and I'm have some troubles setting the corret CO and idle revs.

Firstly the CO. I've got a standard 3dr with no engine mods what so ever. Been told that the CO should be around 2.5%. Well I can't get my CO any lower then 3.0% thats just the lowest it will go.

Then the idle revs. I've set my idle to 900 rpm without the ISCV connected. When I connect the ISCV the revs go op for a sec but won't fall down to 900, it sits a bit around 1100. When I set the idle a bit lower without the ISCV connected it keeps going up and down and I won't get a nice steady rpm. In the end after a lot of fiddiling around I got a reasonable idle around 900-1000 with a warm engine. But when I start the car a day later (with a cold engine) the revs go up to 2K and down to 500 rpm for a little while. It all goes better after a little while when the car is getting hotter.

What causing these 'problems'?

 

Anyone?

 

CO could be down to a dodgy air charge sensor (brown two pin in plenum) or ecu coolant sensor (the blue two pin at the back near the dip stick tube)....amongst any number of things. Idle speed could just be a sticking iscv as its fairly common.

 

So worth to try some new sensors you reckon?

 

A new sensor kit is a good idea regardless mate tbh.....MSD or Matt Lewis Motorsport both do complete kits if I recall correctly.

 

Will a ISCV from a 4x4 Saff work on a 3dr?

 

Yep.

You can disassemble them to clean them out properly.

 

Great, then I'll remove the ISCV from my brothers Saff to try it on mine. See if that makes any difference.