engine is from evo8 - working very unstable - seen on the video.

I though at first that are forking only 3 of 4 cylinders but are working all. acceleration is ok - unstable work is only when standing on idle. when driving - goes ok.

what could be the possible problem? MAF? o2 sensor? could be some kind of idle valve (if evo has one)? or could be some serious problem?

I know that diagnostics could tell the problem but i need to know at least guesses for now.

video:
http://www.youtube.com/watch?v=_XdiknAQXxI
http://www.youtube.com/watch?v=jLYo7M8e-dc

Thank you!

 

hard to tell from the video since im on my laptop and it doesnt have the best speakers. If you are not running on 4 cylinders and you cant scan it you need to do a balance test to discover which cylinder is down and then further diagnose if its ignition, fuel or compression causing the down cylinder.

What kind of ecu and what has been done to this? not really getting enough to do anything for you with the info you gave.

 

i see. in any case i bought the car i was talking about. all cylinders work as car goes fine. just when idle engine works strange. i was told that it has hks camshafts and some kind of tuned crankshaft so some people say that possible that's the reason.

anyway - god evo4 - will the one and only evo4 on the road in my city.

 

Sounds like nice cams to me

 

What do the spark plugs look like?

 

Looks like you´ve got some aggressive cams or a bad tune.

 

cam trigger wheel is different on a e4 make sure to use e4 sensors and trigger wheels!!!!!!!!!!

 

finally got car from dealer's check - throttle position sensor. that's causes such idles, check engine some times and ayc lamp to be on.

question - this part is absolutely same for evo4-9?
part factory number: MD614772

Thank you

 

Sounds like a lumpy idle from cams i just had some hks 264 272 put in my evo 4...and idle is similar to yours but not as lumpy just waiting to go get ecu remapped