just installed my new ecu into my car today. it's a p28 with a basic chip. the motor is completely stock. it idles at 1000 rpms and jumps back and forth to 1500 rpm constantly. also it throws a #21 check light too. and when driving, if the rpms go higher than 5500, the needle just drops down to 0 and the motor keeps on going. so many problems, can anyone help?

 

what motor? what kind of chip??

I kept getting an engine light because I had a wrong harness

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by metal-x &raquo;</TD></TR><TR><TD CLASS="quote">what motor? what kind of chip??

I kept getting an engine light because I had a wrong harness </TD></TR></TABLE>

b18c, with a p28 mugen spec chip.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bottlefed13 &raquo;</TD></TR><TR><TD CLASS="quote">

b18c, with a p28 mugen spec chip.</TD></TR></TABLE>

your car is stock so that chip is not suitable for your application.

 

I had that problem too with a chipped P28 with a Jun program....I swapped the ECU to a chipped P61(92-92 GSR) and it havent been idling weird since .....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nightrider &raquo;</TD></TR><TR><TD CLASS="quote">

your car is stock so that chip is not suitable for your application. </TD></TR></TABLE>

I agree. An ECU upgrade should be done once the bolt-ons and internals(if desired) are done.

 

thanks everyone. anyone have an answer as to why the rpm needle stops at 5500 when driving?

 

yeah, cause you're throwing code 21

 

did you sell your p28 s100 yet?