The Land Of Confusion

[bigredtopsr]

I've been reading around these forums alot and have afew questions about my car. Its a 1990 ex. From what I understand it should have a F22A4, right? But sitting in my engine bay is a F22A1 that doesn't run very well, idle problems, CEL's, smoke, more idle problems, ect.... could some of these problems be because the car is actually sopposed to have the a4?? I've swaped out some jy parts to try to help but it seems worse. should i try a a4 ecu? or maybe it doesn't matter? Like i said " Im confused". I also have a f22a1 from a lude that I'm rebuilding to swap in, will I have the same problems with that motor? and one last question that seems kinda dumb: is there a difference between a auto ecu and the manual?

[mj213]

I may be wrong but the f22a4 would have been stock.

The f22a1 was what came with the Prelude S

F22A4 specs:

Power (bhp@rpm): 130 @ 5,200 rpm
Torque (ft/lbs@rpm): 142 @ 4,000 rpm

F22A1 specs:

Power (bhp@rpm): 125 @ 5,200 rpm
Torque (ft/lbs@rpm): 137 @ 4,000 rpm

Hope this helps!

[bigredtopsr]

I may be wrong but the f22a4 would have been stock.

The f22a1 was what came with the Prelude S

F22A4 specs:

Power (bhp@rpm): 130 @ 5,200 rpm
Torque (ft/lbs@rpm): 142 @ 4,000 rpm

F22A1 specs:

Power (bhp@rpm): 125 @ 5,200 rpm
Torque (ft/lbs@rpm): 137 @ 4,000 rpm

Hope this helps!

Basically what im trying to say is my car should have the A4 but instead it has an A1. Probably was put in as a replacement. is this a problem? should i get a A1 ecu? will an auto ecu work on my manual car?

[evil_demon_01]

Engine model depends on Car model and origin.
F22A1 can be found in Accord DX and LX models.
If the original engine was an A4 and they swapped in the A1 w/o changing the ECU then, yes some problems could arise.
Also yes the manual/auto ECU's are different.

[bigredtopsr]

Engine model depends on Car model and origin.
F22A1 can be found in Accord DX and LX models.
If the original engine was an A4 and they swapped in the A1 w/o changing the ECU then, yes some problems could arise.
Also yes the manual/auto ECU's are different.

thank you for actually reading some of my ?s before posting a reply. you have been helpful. do you think when i swap in the A1 from the prelude I should get a 5sp lude ecu?

[bmxfelon420]

is there any way to check off of your vin to find out what originally came in the car? i have an a1 in my 91 lx, kinda curious.

[bigredtopsr]

is there any way to check off of your vin to find out what originally came in the car? i have an a1 in my 91 lx, kinda curious.

I'm gonna call the Honda dealer tomorrow and ask. from what I've read only the Ex gets the A4, but do all the ex models get athe A4?

[Scubasteve_dan]

This may help your idle troubles
Cleaning out IAC valve
Give it a try

[Losiracer2]

the Prelude S has 135 HP not 125, since it has a P12 ECU that gives it a 10 hp bump, basically if you have the A1 in your accord, you could swap the P12 ECU into your accord and now have 135 hp. Its a common upgrade and SO simple to do. Plug and play 10 hp basically.

[wed3k]

except a1's and a4's internally are the same and use the same ecu (PT3 to be exact), the only thing that differs would be the exhaust manifold.

[bigredtopsr]

This may help your idle troubles
Cleaning out IAC valve
Give it a try

Thanks. tried that already, twice, then i found one that looked brand new at the jy, cleaned it, swaped it, nothing, then I reset my idle following directions from another link on this forum, nothing, bled the coolant, nothing, cleaned the fast idle valve, nothing, reset the ecu, nothing, cleaned the TB, nothing, the list goes on... I'm about to give up.

[BootlegCB7]

randomly swaping jy parts to a old car isn't that great of an idea.

To my knowledge, a4 has a better tubular header with 4-2-1 design which gives it the extra horse and lower end torque. Overall spec of the engine is almost the same (other than the header compare to a1).

difference between a4 and a1 ecu i think is the speed limiter, a1 has it, a4 doesn't, i believe a1 can run with a4 ecu without much problem.

Our cars have TCU, in theory, auto and manual can be mix and match, but sticking with original is better!

hopefully I helped

[bigredtopsr]

Tomorrow I"m gonna find a P12 ecu and see if that helps.

[BootlegCB7]

eh....again...pin point your problem first before you do things...
10hp is not gonna do much in a car that doesn't run well.

try seafoam sometime see if it can clean out ur manifold and help the idle problem.
for CEL...check the dyi section for code pulling....pull the code before you swap parts.
Or just do a compression test on ur engine see if it is worth your time

[bmxfelon420]

would i be alright to swap a p12 m/t ecu into my auto? Kinda curious, might call up the junkyard and see if there are any prelude s's sitting around.