i have a 91 crx si i recently purchased

the tach is retarded, it reads either 0 or 500 at idle

its not actually that rpm because i hooked up to my smog analyzer and it was idling at 750

could someone tell me whats going on??


and the other thing

check engine like (MIL) comes on only at steady cruise between 1000 and 2000 rpm(at least thats what the tach reads)

no code was stored, tried driving it with another person in the car to see if there is a code when the light comes on, and nothing

led on ecu works, code gets stored when there is a fault (pulling off IAT)

any suggestions????????

if anyone went through this problem please let me know, its driving me crazy