Si manifold question, WTF is this??

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Old Aug 25, 2003 | 08:18 PM
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Default Si manifold question, WTF is this??

I'm converting to MPFI and got my Si intake manifold (thank you 4thGSi!!) and i was wondering WTF this thing is and where do i wire the 2 wires

it's on the back side of the manifold, to the left of the evac(<-wtf does that stand for??)


Modified by Sideout at 12:32 AM 8/26/2003
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Old Aug 25, 2003 | 08:30 PM
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Default Re: Si manifold question, WTF is this?? (Sideout)

i believe that is the TPS (throttle position sensor)

sorry, dont know where to wire those to...
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Old Aug 25, 2003 | 08:34 PM
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Default Re: Si manifold question, WTF is this?? (rasta420)

tps is connected to the throttle body so thats not it... humph this has me stumped cause no one talks about this thing in DPFI to MPFI articals
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Old Aug 25, 2003 | 09:17 PM
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Default Re: Si manifold question, WTF is this?? (Sideout)

anyone?
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Old Aug 25, 2003 | 09:19 PM
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Default Re: Si manifold question, WTF is this??

I think there was a thread on this a while ago. I think it was the EGR valve or something like that, something that only autos had. The manifold was probably from an EX.
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Old Aug 25, 2003 | 09:29 PM
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Default Re: Si manifold question, WTF is this?? (FourthGenHatch)

4thGSi said it was from a Si
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Old Aug 25, 2003 | 09:37 PM
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spun Vtec's Avatar
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Default Re: Si manifold question, WTF is this?? (Sideout)

Some si's dont have it others do. It dosnt really do anything if you ask me i had mine unpluged (swapped a motor that had one) and it didnt seem to affect anything. My 89 crx si didnt have it but ive seen other 89 si's that had them so i have no idea.
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Old Aug 25, 2003 | 09:42 PM
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tysf's Avatar
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Default Re: Si manifold question, WTF is this?? (Sideout)

cant tell what that is from that picture

but evac... its eacv and it stands for electronic air control valve
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Old Aug 25, 2003 | 10:03 PM
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Default Re: Si manifold question, WTF is this?? (Sideout)

that is the fast idle control solenoid valve. you dont have to hook it up it will throw no code and not really effect anything at all. it may make your idle a little wierd sometimes. i belive it is used to speed up the idle at colder or warmer temps or something like that. if you really want to hook it up, you can run the two wires directly to the ecu pins, the dx harness isnt wired for it. cant rembmer what ecu pins it is, look in the service manual.
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Old Aug 25, 2003 | 10:08 PM
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Default Re: Si manifold question, WTF is this?? (hatchback_al)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hatchback_al &raquo;</TD></TR><TR><TD CLASS="quote">that is the fast idle control solenoid valve. you dont have to hook it up it will throw no code and not really effect anything at all. it may make your idle a little wierd sometimes. i belive it is used to speed up the idle at colder or warmer temps or something like that. if you really want to hook it up, you can run the two wires directly to the ecu pins, the dx harness isnt wired for it. cant rembmer what ecu pins it is, look in the service manual.</TD></TR></TABLE>sweet thanks alot!
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Old Aug 25, 2003 | 10:51 PM
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I Want An Si's Avatar
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Default Re: Si manifold question, WTF is this?? (Sideout)

i belived 89+ SIs had that valve....... Fast Idle Control valve ive had them unhooked up all the time
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Old Aug 25, 2003 | 10:51 PM
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Default Re: Si manifold question, WTF is this?? (Sideout)

Yeah,I just did the MPFI swap too,and asked the same question,someone said its a cold start solenoid.Mines not hooked up and does just fine without it.
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Old Aug 26, 2003 | 04:58 AM
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Default Re: Si manifold question, WTF is this?? (subgeniusdude)

i just checked my 1989 honda service manual (not the helms, the one with the blue cover) and it didn't list that part at all. i do know this manual isn't as complete as the helms, though...
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Old Aug 26, 2003 | 05:14 AM
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Default Re: Si manifold question, WTF is this?? (I Want An Si)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by I Want An Si &raquo;</TD></TR><TR><TD CLASS="quote">i belived 89+ SIs had that valve....... Fast Idle Control valve ive had them unhooked up all the time</TD></TR></TABLE>

89+ si...i believe the 88 si has a blank undrilled spot for it on the manifold.
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Old Aug 26, 2003 | 10:15 AM
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Default Re: Si manifold question, WTF is this?? (fastcrxsi90)

i have an 89 civic si and it did not have it i also had an 89 si crx that didnt have it either. but i bought an 88 crx si motor of a kid and it had it
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Old Aug 26, 2003 | 11:17 AM
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Default Re: Si manifold question, WTF is this?? (spun Vtec)

my 89 crx si had it. but when i did my zc swap it didn't have it. the plag is just hanging in my engine bay. car runs fine.
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