evo 4 hunting

[w_parker]

Please help me and give me some ideas where to be looking. The evo has a rough idle. I have replaced the maf, replaced all vacuum hoses..well i think ive got them all, Put a new intercooler and hard pipes. The car does have a hls bov on it...could it be this?

Thanks

 

[w_parker]

i meant HKS bov

 

[roynx79]

have you tried removing the dump valve and blocking the holes just to try to see it stops the hunting??

 

[Phil74]

Have you checked your plugs and afm?

 

[Phil74]

Also check idle control switch

 

[w_parker]

done plugs and replaced with irridiums 8's. I'll remove dumpvalve first...just need to find a bung for it :/ If i remove the dv where does the vacuum pipe connect to? ATM the vacuum to the dump valve is straight from the metal pipe just at the bottom right corner of the rocker cover

 

[RsvRob]

Bung that aswell ...