I have a 98 ex civic which i recently turned 5spd I didnt change my manifold and now i am having idle issues. idles 1800rpm with the a/c on idles 1500. could it be my iacv or the fact that i am using an auto intake manifold.
y8 recently swap 5spd idle issues
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345 Posts
its the auto manifold. i have a 96-98 y8 intake mani for 5 speed if interested, even tho i dont have 65+ posts 
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4,152 Posts
I think you should be able to use the auto intake mani...you might just have some vac lines hooked up wrong...
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i forgot to say i ran into the same problem, hook up a 5 speed iac valve and conver to 2 wire and zip tie it somewhere, or do the manifold swap and use it. when i converted to auto i had a shit idle
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3,646 Posts
just get the manifold
they are relatively cheap used
they are relatively cheap used
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2,499 Posts
should be able to use the auto ecu and 3 wire iacv, it will throw a check engine light for the auto trans but it will work and idle fine. i did this when i converted to 5 speed on my y7.
to do it the right way on the y8 you need the 5 speed manifold, ecu, and iacv. then the 3 wire to 2 wire iacv conversion.
to do it the right way on the y8 you need the 5 speed manifold, ecu, and iacv. then the 3 wire to 2 wire iacv conversion.
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