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Old 01-05-2004, 07:10 PM   #1
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Default Could my intake be causing a rought idle?

I noticed back when I first installed my K&N that at idle I can really feel my engine moving, but not all the time. There could be some days that it seems to have an almost miss and others I can't even feel it run. I was wondering what this could be? Runs smooth when accellerating.
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Old 01-05-2004, 08:08 PM   #2
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Yes, altough I don't know why. Both of my cars idleled rougher aftre the drop-ins. Mine is still a little rough with the SLP CAI.
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Old 01-05-2004, 09:44 PM   #3
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Probably no way to correct this them without going back to stock? Its not a problem, just sometime annoying at 6am when its idling for 10 minutes waiting for my gf to get done at work. Will getting my high flow exhaust help any?
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Old 01-05-2004, 09:57 PM   #4
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Your exhaust should have very little or no effect on it. Do you still have a MAF screen?

My modified stock airbox with the drop in K&N idled a little rougher than my ADTR intake with no screen. Your increased airflow is probably causing more turbulence if you don't have a smooth wall intake. This prevents your MAF from accurately reading the incoming air (worse in the cold weather with higher intake pressures/air density), and your pcm is 'hunting' between lean and rich. You're getting more air than your MAF says you are, then the O2 senses a lean condition. The PCM dumps more fuel, and the cycle repeats.

This is just a theory, and is assuming everything else is in perfect working order.
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Old 01-05-2004, 11:55 PM   #5
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i still have the stock airbox and paper filter *waits to get hit* and i have a rough idle. do i need new plugs? new wires? could a dirty filter cause it?
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Old 01-05-2004, 11:58 PM   #6
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Plugs and wires are a good bet, but you need to ask yourself how old they are. If you don't know, change them. They'll need it soon, anyway. At the same time, that'* no gaurantee to solve the problem you have. It could be a coil, fouled injector, even a PCV valve.

I think a full tuneup including fuel filter, plugs, wires, air filter, PCV, etc are in order. How old is your O2?

Alot of contributing factors to a low-rpm or idle miss. USUALLY ignition related, even if it 'feels' like it'* fuel related.
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Old 01-06-2004, 12:42 AM   #7
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Quote:
Originally Posted by willwren
Plugs and wires are a good bet, but you need to ask yourself how old they are. If you don't know, change them. They'll need it soon, anyway. At the same time, that'* no gaurantee to solve the problem you have. It could be a coil, fouled injector, even a PCV valve.

I think a full tuneup including fuel filter, plugs, wires, air filter, PCV, etc are in order. How old is your O2?

Alot of contributing factors to a low-rpm or idle miss. USUALLY ignition related, even if it 'feels' like it'* fuel related.
I replaced the wires, plugs, O2, PCV about three months ago. It started to idle rough around the time I put in my K&N and opened up the stock box more.
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Old 01-06-2004, 01:32 AM   #8
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Here'* a dumb question which suprisingly wren didn't ask, did you remove your MAF screen?
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Old 01-06-2004, 01:35 AM   #9
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Quote:
Originally Posted by BonneMeMN
Here'* a dumb question which suprisingly wren didn't ask, did you remove your MAF screen?
Quote:
Originally Posted by willwren
Your exhaust should have very little or no effect on it. Do you still have a MAF screen?.
er.....
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Old 01-06-2004, 01:45 AM   #10
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I saw exhaust and i figured he was gonna explain it, and so i skimmed. Fack off!
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