Ok heres the deal..i have a 92 prelude w/ a f22a1 and I cant seem to figure out the idle surge problem/jumpy under steady throttle.The problem exists both when the cars cold and hot,in gear and out of gear. Even after replacing everything below it still throws 12(egr lift sensor) and 23(knock sensor).Im now leaning toward it being the ecu???


Heres a list of things ive done/changed


Tps
Iac valve
Tightened fitv
Fuel filter
egr valve and gasket
egr control valve solenoid
constant vacuum control valve/egr vacuum control valve
plugs
cap/rotor
air filter
full of coolant/and no air in system
no vacum leaks and the hoses are in correct position

The only codes its throwing are 12(egr lift sensor) and 23(knock sensor)

Thanks

 

iacv i had a problem almost identical to that. when driving it's fine until you hold a steady throttle or speed. at idle then too it jumped.

 

The f22a1 does NOT have a knock sensor, Did someone do an engine swap, what ecu is it? Check your egr wiring, i can send you the flow charts if you want. Your prob is either the wiring or ecu, also try bleeding the cooling system.

 

I really think that could be the problem cause the vin number says its an si and it has an f22 in it which isnt right. I guess i should look and see what ecu it has. What ecu does the f22 need p12?p14?

 

It has a p14 ecu in it now so im guessin i need a p12

 

yep you need a P12, i have an auto P12 ecu left over from the swap

 

problem fixed...new ecu and whoever swapped the motor had two vacuum lines crossed 16 and 24. Thanks everone for yalls help.
Kevin