Hey guys here I am agian working on the car. Hopefully one day ALL the quirks wil be worked out and you all will be to thank. Well I got my car running "better" by adjusting the TPS to the right voltage and all my check engine lights are gone BUT tell me what I need to fix with the cars idle jumps up and down but DOESNT trow a check engine light?

 

vaccum leak or iacv

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by O.G triple O.G &raquo;</TD></TR><TR><TD CLASS="quote">vaccum leak or iacv </TD></TR></TABLE>

Yup, try cleaning the IACV. Use search to find poisons post on how to clean, really easy.

Or, you might be low on coolant, gives the same symptions of a bad idle as you described.

 

Is the IACV bolted on the back of the intake manifold on a d16? just making sure I got the right parts in mind

 

maybe there is air trapped in the coolant system, i know this can cause an erratic idle.

 

hmmm coolant? could be cuase last time I started it I checked to make sure the heating system was running and I either didnt let it run long enough or my fans messed up cuase it never kicked on

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by horror &raquo;</TD></TR><TR><TD CLASS="quote">maybe there is air trapped in the coolant system, i know this can cause an erratic idle.</TD></TR></TABLE>

Yup, this could cause it too.

Bleed your coolant system.

 

cool well thanks guys gave me lots of options to try Id never even thought of

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DsCivicEx &raquo;</TD></TR><TR><TD CLASS="quote">cool well thanks guys gave me lots of options to try Id never even thought of</TD></TR></TABLE>

Any time.

When I had my 90 prelude si, oh it was a good car... Anyway, it leaked coolant until it got low. Once low the idle bounced up and down until the engine was at operational temp. In really cold weather, even after it's warm the t/b could stay cold causing the idle serge.

 

Check the coolant for air bubbles,clean iacv,spray down and check for leaks.

 

you might want to check your intake manifold gasket for leaks/cracks, my friend had a 240sx and that was the cause of his eratic idle

edit: i'm not sure if that would throw a check engine light or not, but just a suggestion. hopefully someone who knows will post and then i cna learn something new

 

let us know what happens!!