I have a p28 running a y8 in a 89 Hatch Si

The ECU hummms at a certain throttle point, regardless of gear, speed etc.

I had a different ECU prior on the same setup, and it did not do this, but when I put in the stock p28 instead of a pgmfi.org chipped ECU it started humming,

Ideas?

 

im gonna go ahead and guess its your ecu

 

check the wires see if they tight?

 

I've check and rechecked,

even regrounded my entire engine, block, head, tranny, intake mani, all with 2 gauge and back to the common battery ground.

Still no help,

So you thinking ECU then?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by groundedcivic91 &raquo;</TD></TR><TR><TD CLASS="quote">I've check and rechecked,

even regrounded my entire engine, block, head, tranny, intake mani, all with 2 gauge and back to the common battery ground.

Still no help,

So you thinking ECU then?</TD></TR></TABLE>

You did all this before finding another ECU and trying it out? Mad props on your enthusiasm

 

change your ecu if it stops humming you found your problem