i swapped a dohc zc into my 88 dx hatch everything runs great except the screw for the idle I turn it down because my engine revs up to 2k then dies down to 800. So i turned down my idle and it works great except the screw is loose because it unscrew right back and revs high then dies how do i fix this problem.

 

Any CELs? You're not supposed to just go in and start adjusting the idle screw, you need to adjust it in accordance with the procedure in your repair manual. If you don't have one, get one. Otherwise:

1.) Warm car to op. temp and unplug EACV
2.) Note idle speed, should be ~750RPM, if not adjust w/ idle screw.
3.) Plug EACV back in, should make a sucking noise
4.) Shut car off, reset ECU
5.) Repeat checks with high beams, defroster and heater on HI
6.) Adjust if neccessary

If this fails to fix it, either: 1) Your EACV is dirty (clean it!), 2) Your EACV is faulty (replace it!), or 3) You have a vaccuum leak somewhere.

 

check ur fitv might be stuck open at idel and that cuases vacuum. also check ur iacv. mess with idel screw a lil more, if u need more info i have lots to give hit me up. good luck

 

ZCs don't have a FITV.

 

also, low coolant level or air in the cooling system can cause the fluctuating idle

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">also, low coolant level or air in the cooling system can cause the fluctuating idle</TD></TR></TABLE>

Ah yes, forgot this one. Fill / Bleed your system as well .

 

ok if thier is no fitv then take off ur intake and when u start it put ur finger on the lower hole, and if their is vacuum then thier lays ur problem, block it off, also if u have ur finger on the bottome hole block off the top and if ur car stals then ur iacv is still good

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by superhatchbackbros &raquo;</TD></TR><TR><TD CLASS="quote">ok if thier is no fitv then take off ur intake and when u start it put ur finger on the lower hole, and if their is vacuum then thier lays ur problem, block it off, also if u have ur finger on the bottome hole block off the top and if ur car stals then ur iacv is still good </TD></TR></TABLE>
as stated by wiZCco, the DOHC ZC doesn't have a FITV and because it doesn't, the intake manifold doesn't have a lower hole - just one for the EACV

 

so your telling me on the TB thier is only a upper hole and not a bottom? by me saying take off the intake i ment the intake tube that goes to the tb not the whole intake.. do u have 2 holes in the TB? upper and lower?

 

don't know how to say it any other way - there is only one hole in the TB and one hole in the IM

 

ok well then thats good, its deff someting else then.. good luck.

 

I need to just the idle on mine as well

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how do I upload a picture without it costing me money I have a picture of whats wrong.

 

go to imageshack and upload your pic, then copy and paste the link on here.

 

 

okay screw this image thing its not working who has an email address. I'll send ya the picture of the problem .

 

i have the same problem for a year or so, never got a chance tp fix it