Full D16Z6 swap with wiring harness, ECU, everything.

Cannot for the life of me figure out this partial throttle engine stumble. It constantly throws code 14. Does not stumble under WOT.

This stumble is BEYOND annoying and makes the car hard to drive because it stumbles like this on partial throttle (i.e., take offs, between gears, etc.)

Has brand new OEM Honda IACV installed. We've (my brother and I ) been dealing with this for over a year now, and parked the car out of frustration months and months ago. Just now looking into it again.

Anybody have any tips/suggestions?

*edit for more info* We've replaced the ECU, replaced the entire intake manifold/throttle body/etc (as one unit) from a good running '93 EX with the same results. The intake manifold/throttle body/etc. from the '79 works just fine in the '93 and does NOT have the stumble when installed on the '93. Compression is in spec as well


[youtube]dISo96he4iQ[/youtube]

 

Have you measured output voltages from the TPS at various throttle positions, especially where the problem is ocurring?

 

my computer is slow so im trying to finish downloadingg the vid
but i can for sure tell you one thing that you have done wrong... you gave up!!
i heard this on this website and it hasnt failed me yet dont guess...troubleshoot!

 

Yes, forgot to add that. That was the first thing we did, and installed a brand new TPS.

But remember, we swapped the complete intake manifold/throttle body/etc. to the '93 though, and never swapped back. The '79 has the "unit" that was originally in the '93 and vice versa. The '79 does the stumble with both "units", and neither "unit" stumbles in the '93.

Oh, we didn't give up. Just had other projects to work on (ls1 rx7 build, some Maxima stuff, etc.)

We kind of just parked it because we were so stumped. My brother loves this little car and we put a ton of effort into the swap so we're definitely not giving up. Just stumped!

 

good never give up!! especially on that car that thing is sick!!
anyway you should maybe try messing with the timing on the dizzy a lil.
and another thing... it happened to me in my z6 and i finally relized that i had a bad throttle body gasket when i replaced it it was fine but mine was stubling like that alll the way from closed to wide open you said your only does it until you build rpm rigght??
and also check out your ecu