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Strange rough idle (with video)


antik
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Hi guys

This problem started a few months ago. Took it to a mechanic who said it might be the sparks plugs to i got those replaced and got a new battery while I was there and it was good up until this week.

The problem is back, funny thing is it's perfect in the morning after it has been off all night, but after 5-10 minutes of driving, it will start running very rough and even stall when idling. If I turn it off and straight on again, it will take a good 4-5 attempts for it to start.

Here is a video of the rough idle, you may need to turn your speakers up a little bit: http://www.youtube.com/watch?v=v1ehx-5nFNo

Any idea what this could be?

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I had a similar problem in a 93 cc lancer. Every now and then i would pull up at a set of lights and it would idle funny almost like i was reving it...... people always thought i was trying to race them. which is pretty embarrassing in a lancer next to...... well pretty much anything.

turned out to be the throttle body needed cleaning from memory. dunno if thats any use to you.

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I might care to add that it's just not an idle problem, sometimes it also doesn't accelerate when I give it gas. Like if I'm in a higher gear (3rd or 4th) and floor it, nothing happens for a few seconds then it picks up.

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Belts won't cause a looping idle like that. As Anthony said, very likely it is a fuel issue, however could be cause by a myriad of other things, such as vacuum leaks and the IAC (Idle Air Control Valve). At the absolute worst case it could be a blown head gasket, but lets hope it's not that. I would suggest checking for vacuum leaks such as damaged or disconnected vacuum hoses firstly. If no luck there consider a new fuel filter and having the injectors cleaned and tested. Was there any work carried out on the distributor at all(such as distributor o-ring)?

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