any idea why an evo 4 would run rough at idle and miss until it hits 2000-3000rpm and then its fine. i have changed spark plugs and coils but unsure of what could be causing it.
mugenb20b,
Dec 1, 10:31pm
Vacuum leak or dirty throttle body maybe.
carmedic,
Dec 1, 10:49pm
I'd start by discovering which cylinder it's missing on.
bevharris1938,
Dec 1, 10:53pm
Mine runs rough at idle , but doesn't miss at 2k , but it does have 11mm lift cams.
peita.cook,
Dec 1, 11:05pm
compression test! just been google-ing and its pointing to a vacuum leak so going to do a leak test tonight to see if i can locate anything
mugenb20b,
Dec 2, 12:34am
Check the EGR valve too.
savanna71,
Dec 2, 12:48am
Evo 4 never had EGR
mugenb20b,
Dec 2, 12:54am
In that case, my mistake, but I do recall working on an EVO that did have an EGR valve, just can't remember which one.
theram1,
Dec 2, 12:55am
off subject, strange name for a Southlander, you from up north!
savanna71,
Dec 2, 12:55am
Most people confuse the SAS with EGR, evo 7 onwards had EGR
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