Ok heres the story, got my ZC running last week had to take a few small parts off my Si to mae it run right. I cleaned the blackened injectors, the Si's EACV is on there and the throttle body to dashpot connection had to be replaced. My current problem is a missfire, I get a rough idle and it hesitates at low RPM. I'm not sure what the problem is now, I swapped have all new, plugs, wires, rotor and cap, so I know thats most likely not the problem I also tried seafoam after seeing the injectors. So, now I'm pretty much out of ides, I pulled the plugs and they're black already which leads m to believe I'm running lean, any suggestions, also I'm thinkng maybe new ground wires.

 

First of all black plugs means that your car is running rich. also have you tried switching your IAT and Your IAC or EACV. Sometimes those wires get mixed and the symptoms that your talking about occur. If you need any more help cintact PFISpeed.com 970-206-1029.

 

What makes it run lean?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SwissChEz82 &raquo;</TD></TR><TR><TD CLASS="quote">What makes it run lean?</TD></TR></TABLE>

Too much air not enough fuel.
clogged injectors, clogged fuel filter, and weak fuel pump could cause leaning out. Got an adjustable fpr?

 

Correction what makes me run rich?

 

do you have any check codes?
Or your O2 could be stcuk at peak MV

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SwissChEz82 &raquo;</TD></TR><TR><TD CLASS="quote">Correction what makes me run rich?</TD></TR></TABLE>

bad fuel pressure regulator, leaking or stuck open injectors, kinked or clogged fuel return line.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbonbird &raquo;</TD></TR><TR><TD CLASS="quote">do you have any check codes?
Or your O2 could be stcuk at peak MV
</TD></TR></TABLE>

No codes and what's MV?

I just cleaned the injectors but I guess it's still possible. The return line isn't kinked but may be clogged and the FPR isn't that old. I did notice it had a smaller port when I replaced it though.

 

Milivolts, it's the voltage that your 02 sends to your copmputer telling it to richen or lean the mixture.

 

Check your distributor. Make sure you're getting some nice spark.

got any friends with known good injectors. Thats what I like to do. Pull em off a good car and check.

 

I still got my Si engine

 

yeah man just try switching some parts from your other motor and try them out

 

A little update, I swapped injectors with my a6, nothing. Swapped TPS's, nothing. But look at this.

ZC TB

Is this normal???

 

did you find you problem sounds a little like my zc

 

hey i had the same problem w/my b16 swap...i changed the plugs wires cap and rotor and still has the miss fire...change ur fuel injectors and that should help hopefully.mine looked good and i used sea foam and helped at first but after driving it it still was miss firing try to change the fuel injectors..