thumper92

wat up
i have a 1992 honda prelude with a f22b motor in it the engine is in mint condition synthetic oil , premium gas , bocsh iridium plugs , ngk wires , new fuel filter , new cat , replaced egr system + cleaned intake manifold and throttle body new distributor cap and rotor !!failed emissions test twice !!! my question is.... the only reason its not passing because it doesnt have a knock sensor that doesnt come with this engine ? should i change the ECU to a p39 f22b ecu or should i continue to use my h23a ECU unit and install a knock sensor myself and how , there is no place for it ? and will changing the ecu to a f22b ECU help alot , and get me a pass? any help would be appreciated

fantazzum

Im having the same problem. My emissions doesnt expire until the end of Sept so I still have time. Good luck finding a p39. I've looked high and low and no luck. If you know where to find it please let me know.

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My Prelude... The neverending project car.

fantazzum

Found a P39 at a junk yard near Citi Field. $100 bucks. Car runs better than with the p14. Still have a CEL but now its the EGR valve. Gonna try to clean that first and see what happens.

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My Prelude... The neverending project car.

viper-blue

There are more than just one JDM ecu that will help you pass. I borrowed at PT3 (Don't quote me) from a buddy and passed etest. Either way you have to install a knock, or get an ecu without it. The car runs fine for the most part without the knock sensor, but once your engine warms up you lose hp because your P14 is looking for a signal, so it can set the timing back.

There are a few holes above the oil filter that you can utilize for the knock sensor if your going that route.

To the OP:

I know what your going through, did all the common prelude fixes for etest, just to discover there was only one problem all along, lol.

Your in TO, just go to Toronto JDM, the little Pakistani guy there will fix you right up, he knows his ****. They have P39's for 200 canadian, or he can set you up with something that will work, for half that price.

thumper92

thanks for all the advice !!!

i already found the ecu p39 for $60 i installed it 2 weeks ago the car seems to be running better. just took it out today no trouble codes for knock sensor anymore ! i thought i would drive the car down to niagra tonight and back to clear out the system and then take it for the e-test tomorrow !!! now if this doesnt work there is nothing left to do i have done everything im lucky i can do all this work myself or i would have had to sell the whip !!!!
p.s. ECU supplied by, japan auto supply
wish me luck !

fantazzum

Hey Thumper any luck passing emissions?

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My Prelude... The neverending project car.

thumper92

so i did all that i said i would do and the car failed badly. FOR THE THIRD TIME !!! me and 3 other mechanics have checked this car over and over again cant find anything wrong with it , got all of us stumped !! the only thing i can think of is to check the timing on the engine !!! any help would be appreciated especialy those guys that know the f22b dohc engine

thanks

thumper92

so i pulled apart the timing belt cover and found that the belt is really loose its going crazy when i switch the car on but it doesnt seem to be missing the teeth on the belt or skiping the gear sprokets !!! can anyone tell me if this is the reason why my car is failing emissions test ?

thanks

thumper92

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JDMugenBB1

I'm in the same boat. I have an F22B and I just installed an H23 ECU and I'm taking it in for etest this weekend. The CEL doesnt come on unless I REALLLY punch it.

Has anyone done a Knock Sensor Workaround?? some way of by passing it.... maybe with a resistor in the ECU??

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thumper92

just try to find a used ecu for the f22b i found one for 60 bucks and the ecu code is p39 for f22b dohc no v-tec and make sure you get auto or manual two different ecu's

still failing e-test tried lowering the screw located ontop of the throttle body for air intake it passed no2 but everything else went higher !! struggle of a life time !!! loosing heart for ma ride !!!