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idle controll valve and starting 16v; are they connected
Topic Started: Wed Aug 19, 2009 11:48 pm (923 Views)
merc190uk
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The Godfather

Right the last week or so mines been 98%
so i changed the idle control valve (icv as sometimes listed on here)
thought it responded a lot better

but


now it doesnt start off the key ?

6-8 revolutions before it does then runs crap and tries to stall untill warm, then fine

so i changed the cold start valve (would make sense i thought)
in my head i some how thought that my (maybe) nackered icv was masking my (maybe) nackered csv ?

so new(ish) icv and csv but still crap to start when cold ?

i messed around with the settings tonight and wont know till the morning if i have sorted it

but any one know why this would happen like this ?

is the icv linked to starting in cold somehow ?
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stwat
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Sounds exactly like mine Steve!! I have now unplugged the connector to the cold start valve and it starts up from the first turn of the key 99% of the time now!
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Michael
Needs Help
[ *  *  *  *  *  *  * ]
I don't know the answer to that problem, but if you know who set up Wills car, he's the man.
I've had a few, but none have ever been set up so well . :D
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alogaparaloga
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crazy mind
[ *  *  * ]
Boys, just a thought....
What relays are connected/linked to both valves?
It is worth checking as I have seen a similar starting problem to other cars and it was due to bad relays.

My engine needs a generous cranking to start too, and it does that during the last month. It's an 8-valve though.
But I cannot see any mechanical problem related to that.
Edited by alogaparaloga, Thu Aug 20, 2009 12:04 am.
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merc190uk
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The Godfather

well worth finding out but mine and stwats cars dont have pin 3 for us to check

i know Andys a busy man and dont like to bother him all the time for free advice :lol:
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merc190uk
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The Godfather

update still crap this morning and leaving work ^o)

so this evening a put the old icv back on and presto fired straight up !!!

si it would seem my spare idel controll valve was shagged :lol: so is yours maybe :'(

one thing worth pointing out

on comparing the two

looking in side at the slider one was completely closed
the other had a gap of around 2mm

when powered up they both twithced ? and run the few second cycle but the closed one never noticable opened or the other closed so not sure really what i should be seeing

Anyone put any light on what a good icv should look like

will see how mine starts again in the morning but it may apear that the icv aso helps with starting !
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merc190uk
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The Godfather

Stu (and all)

its running fine again with my old icv back in so must have been that !!

turn key and starts instant
old icv crap to start and run as if it was the cold start ??????????

go figure :ehh:
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merc190uk
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The Godfather

yep several days in and its still perfect
so it was the icv B)
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stwat
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I'l have to try and get hold of one then, Steve.
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