New guy here needs some advice. - Honda Prelude Forum

334ponce · 08-08-2009, 06:34 PM

Im new to the forum and been unable to get good tech advice from the other prelude forum sites so thought i would see how this site is. First off i have a 92 Prelude with the h22a4 and m2b4 tranny. I just recently finished the swap after buying the motor from someone. The problem im having now is that im using the jdm p13 ecu and my car seems to be in limp mode since it wont rev past 2500. The car is idling like complete crap and gets a little better after it warms up. The car is running extremely rich and im guessing its due to the jdm p13. I ran the cel and its throwing a code 21 vtec solenoid. Will this cause the car to run in limp mode? Another thing is i dont have the knock sensor hooked up since the actual sensor is broken off. Would it be better to just go with a p28 or p06 and have it chipped and tuned? . Any advice is appreciated i know its alot but i did the swap a month ago and still have not driven the car just trying to figure out the kinks. btw i know all my vtec wires are wired up correctly. Thanks

Kronn 98SH · 08-09-2009, 04:37 AM

Your best course of action would be:

1) Get the ECU that matches your engine. This shouldn't be tough since there are tons of H22A4 (manual) ECUs floating around because lots of people reverted to OBDI.

2) Fix your knock sensor. It's not causing your problems, but do it anyway.

There's no sense in chipping a P28 for your OBDII motor unless you've done some modifications. You're better off (financially and chronologically) just getting a VAFC (I or II) and fixing the A/F ratios. That's IF using the proper ECU doesn't already fix it.

jsmooney · 08-09-2009, 07:15 AM

either change the sensors so it will work with a obd2 motor OR get a odb2 to ob1 conversion harness

334ponce · 08-09-2009, 02:59 PM

The motor is obd2 but the dizzy has been converted to obd1. Thats y i figure getting the p28 or p06 might be a financially better choice.

jsmooney · 08-09-2009, 06:24 PM

there are a few differences. is there a CEL?

334ponce · 08-09-2009, 06:27 PM

Yea the cel is throwing a code 21 vtec solenoid. And thats the only code its throwing

jsmooney · 08-09-2009, 06:50 PM

hmmm

a vtec solenoid shouldnt make the motor run like crap. do you have a h23 ecu? it should run fine with the h23 ecu if it's just the solenoid

334ponce · 08-09-2009, 07:10 PM

no i have a p12 and the p13 but thats it