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Surging Idle

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Old 05-23-2006, 06:40 PM
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Default Surging Idle

I have a second gen B16 and i have a problem with my idle surging. I replaced the IAC valve and flushed the cooling system, it doesnt get hot or anything, the fan works and it will really only do it during the day when I drive it for like 20 minutes or so. Any ideas???
Old 05-23-2006, 07:01 PM
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Default Re: Surging Idle (SIRTIM96)

It could just be your timing. Check your egr valve also.
Old 05-23-2006, 07:26 PM
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Default Re: Surging Idle (mugen18)

vac leak, tps voltage.. maybe
Old 05-23-2006, 07:43 PM
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throttle body gasket....maybe
Old 05-23-2006, 07:44 PM
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Default Re: Surging Idle (SIRTIM96)

it might be your fast idle. check that
Old 05-24-2006, 05:38 AM
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Default Re: Surging Idle (SIRTIM96)

spray some brake cleaner around the vacuum hoses/intake manifold to see if you have a leak.
Old 05-24-2006, 05:41 AM
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Default Re: Surging Idle (kpop)

Yeah, usually its the intake manifold gasket.
Old 05-24-2006, 07:03 AM
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Default Re: Surging Idle (SIRTIM96)

did you bleed the cooling system? Normally the fan wont come on unless your low on antifreeze.. could be a possiblity..but not sure if it will have anything to do with idle
Old 05-26-2006, 04:27 PM
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Default Re: Surging Idle (bmiller17)

I actually switched ecu's and still had the problem. So i put the old ecu back in and it went away, at least for now... if it comes back i will try all of the tips you gave me, thanks for the help.
Old 05-26-2006, 04:35 PM
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Default Re: Surging Idle (bmiller17)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bmiller17 &raquo;</TD></TR><TR><TD CLASS="quote">did you bleed the cooling system? Normally the fan wont come on unless your low on antifreeze.. could be a possiblity..but not sure if it will have anything to do with idle</TD></TR></TABLE>

Huh?

I've never heard of this.
Old 05-27-2006, 08:46 PM
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Default Re: Surging Idle (HalfAnP)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HalfAnP &raquo;</TD></TR><TR><TD CLASS="quote">

Huh?

I've never heard of this. </TD></TR></TABLE>

yeah...i had a couple buddies tell me that. Basically what they said was...the fan only comes on as a backup..for instance if you are low on antifreeze or the lines havent been bled.
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