If you can figure this out you are god to me

[b20a5lude]

Please read this and help me if you can!!!

I rebuilt my 1988 prelude engine and am having problems with mixture! It is a B20A5 engine,fuel injection 2.0l. Symptoms:

With no check engine light:

-runs rough
-as soon as it hits 3750 rpm it has a definate iBIG JUMP in horse power!!!!
-smells like it runs rich


After check engine light comes on:

-runs better!!!
-no big jump in hp @ 3750 rpm
-does not smell as rich

Apon rebuild I replaced the o2 sensors with new NGK o2 sensors, new distributor cap and rotor, plugs(platinum), ect...

please help me !!!!!!!!!!!!!! The biggest thing I noticed is the gain of HP when the light is off (weird)????? Could it be the o2 sensors ...egr valve??? pcv valve???? I confused????

Thank you
Steve

[RedFC3S]

maf?

[hondaprelude88]

ok has to be an o2 sensor, when you first start the car it runs rough and rich because its not working like intended. when the light pops on, the ecu cuts to default fuel settings on leaves the o2s out of it this is why it runs better but it will not perform like intended. I would check the o2s out.

[b20a5lude]

Thank you !!!!!!!!!!!!!!1 I changed the o2 sensors and the egr valve and now it runs awsome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!


Thank you very much!!