hello,
I own a 1994 prelude si. i attempted to swap a jdm type s motor and have had nothing but problems since. here are the symptoms; when the motor is being managed by the p13 ecu the car has an unstable idle with some audible detonation. when trying to drive with this ecu the car behaves VERY strange. it feels as if the cars timing is in an extreme retard state....but that is not the case. and vtec will not engage. the car is impossible to drive with this ecu. it runs that bad. but when i drive the car with the original p14 ecu it behaves normally. except for no vtec obviously. as far as i can tell the person who did the swap wired the new engine in the exact same as my original h23, minus the associated vtec wires. it has been an ongoing problem for around a year (just driven w/ p14, due to no money). any insight would be greatly appreciated.

adam

 

If you are going to run a P13 chip it, the fuel, vtec engagement and timing maps are different for the S spec motor, and you will not experience the power this engine can deliver. Also, was the motor wired correctly to run an OBD1 ECU?

 

i have had two different chiped ecu's. neither of which helped my car to run any better. the wiring is something that could be wrong with it. as i said before, to the best of my knowledge, the type s engine is wired the exact same as my previous engine, minus the vtec wires. i know the crank angle sensor is different between the two generations. but if that was the case why does the engine run normal with the p14 ecu, but not the p13 ecu? aslo the type s engine uses the same ecu (p5p) as the h22a4. i wouldnt think the maps would be different enough to cause the types of problems i am having.

 

don't forget that the two engines(h23 and h22) use secondary butterfly's in the intake manifold and any usual ecu except for that from the type s would probably throw off the idle due to it's single plane manifold design. other than that i'd check the wiring then check the timing. and get the true specs for the type s(ie timing).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">don't forget that the two engines(h23 and h22) use secondary butterfly's in the intake manifold and any usual ecu except for that from the type s would probably throw off the idle due to it's single plane manifold design. other than that i'd check the wiring then check the timing. and get the true specs for the type s(ie timing).</TD></TR></TABLE>

The type-s has a dual runner manifold like the USDM H22a so that's not his problem.

People run type-s pistons all the time and do not have any fuel management.

Adam your problem is simple: Injectors

Type-S (5th gen): Saturated 290cc injectors
P13 ecu expects 4th gen: Peak and Hold 330-345cc injectors

So the p13 is sending a pulse width expecting 330-345cc per min of flow. But due to the injectors on the type-s you're flowing about 15-20% less fuel than you should be.

Replace your injectors with OBDI prelude ones and make sure you have the injector resistor box in line. If you are running a resistor box with those type-s injectors that will also cause many problems.

 

I have been doing so for 3 years without any issues.. 98 Types S in 93 hatch with stock injectors and ran with p13, Accord ECU, and now stock p28 without any problems. I would recheck the wiring.. All of this with resistor box inline..

I do want to get some ODB I injectors to see if it makes a difference but until then the engine runs just fine..

 

i was thinking it could possibly be the injectors. but i didnt want to throw a bunch more money at the problem and have it not work again. i wasnt the person who did the wiring to begin with, so i wouldnt know where to even start looking. the other option i was considering was to get the OBDII harness and ecu. thats a lot of money and i need to find a reputable shop to do it. either that or i do it myself and have the car down for a lot longer, and that is something i dont think i could afford to do. do you guys know any more info about this resistor box, like location, what it looks like and so forth. thanks again

adam

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jason kiDD &raquo;</TD></TR><TR><TD CLASS="quote">I have been doing so for 3 years without any issues.. 98 Types S in 93 hatch with stock injectors and ran with p13, Accord ECU, and now stock p28 without any problems. I would recheck the wiring.. All of this with resistor box inline..

I do want to get some ODB I injectors to see if it makes a difference but until then the engine runs just fine..</TD></TR></TABLE>

That really makes no sense. The 5th gen injectors are saturated and should not have a resistor box hooked up. Surprised it's working properly that's for sure.

 

When I had my first swap done in my 91 Accord that is how the shop hooked it up.
I asked far and wide and no one had any real answer as to if it is doing any damage. So when I put the engine in the civic i just hooked it up the same way.

Remember the whole point of the resistor box is the gaurd the injector drivers on the ECU from the high voltage of peak/hold injectors.. Does do much else other than that..

 

i think i am going to try the injectors. do any of you know where i could purchase some, and how much they would cost? thanks for all of your help, it was very appreciated.

adam