Okay - I have a '91 CRX Si, with the original d16a6 motor- finally got ahold of an intake manifold from a d16z6, so...

plopped on a b16a (1st gen) TB and reused my original injectors- split the vacuum line going to the oem fuel pressure regulator to hook up the dashpot on the throttle body (which doesn't quite seem to function right) - everything else is set as it was with my original intake manifold, except for the complete lack of a fast idle control valve (just taped off the plug)-

So I got everything in and started it up- only to get a code 14, EACV (or IACV in this case)... the idle seems fine, but as soon as I give about 1/8 to maybe a 1/4 throttle, the engine surges- until I get to about maybe a 1/3rd pedal, at which the engine just revs right up as normal. I checked for voltage across both wires going to the EACV/IACV and no voltage between the two, voltage from BLK/YEL to ground, but none from Blu/(whatever) to ground. When battery voltage is applied, the IACV does click open and closed.

Any ideas? any at all would be greatly appreciated.

Oh and before swapping intake manifolds - the engine threw no codes and ran fine.


Modified by crAppAchic0 at 9:34 PM 9/6/2006

 

Anyone? Some random thoughts?

 

what you mean you just taped the plug off(fast idle valve)

-joseph

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lightcrx &raquo;</TD></TR><TR><TD CLASS="quote">what you mean you just taped the plug off(fast idle valve)
-joseph </TD></TR></TABLE>

The z6 intake has no fast idle valve- and there is no sensor in it, the ecu only controls it based on temperature. So unplugging it does not throw a CEL.

I spent a bunch more time today trying to figure it out-

Unplugged the dashpot on the throttle body thinking it could have been a vacuum issue to the fuel pressure regulator- nothing. unplugged the brake booster and plugged off that outlet (just to make sure) - nothing again.

I'm still getting the code 14, for the EACV- would this make the engine surge, regardless of engine speed- only when the throttle is applied? The idle is fine and smoothe. I tried swapping the fuel pressure regulator off my old fuel rail - no difference.

I unplugged the vacuum line from the fpr, and plugged it off- no difference.

The only consistent thing has been that stupid error code- would a code 14 (EACV malfunction) cause engine surging?

Has anyone else swapped a d16z6 intake manifold & b16a(or b18a1- I think) throttle body onto a d16a6 head & block? Any issues?

 

Just to bump a ridiculously old thread- I did fix the problem- the harness going to the EACV was hacked apart by the previous owner- the two wires were swapped. Swapped them back and everything was happy.