SiRLudeVtec

BUMP THIS TO THE TOP!

Ok... before i say anything, here's my setup

JDM h22a swap into '94 si prelude
AEM CAI
DC SPORTS HEADERS
GREDDY EVO EXHAUST

Here's my problem...

I've been running the h22a engine off of the p14 ecu. WHY? Because when i swap the p13 ecu in, it boggs terribly. I don't know why. I'm not throwing any codes. The car is in the shop right now with Joe Demaree, but he's clueless also...he thinks it's an electrical problem. We checked the throttle posistion sensor and still nothing. What bothers us is- the car runs GREAT off the p14(h23) ecu, but when we swap in the p13, it runs like "SHlT". We've also put in an ecu from the B16 and it does the same exact thing! BOGGS! But anyway, we are for sure its an electrical problem we just don't know what. Has anyone else had this problem? I mainly need to know some differences of the p13 and p14 ecu. Something is wrong. Like i said, we checked the voltage with the throttle position sensor, but it was fine. This needs to stay bumped up because if anyone else has had this problem....it needs to have a solution. Any/all suggestions are welcome. If anyone has a pinout for the p13 and p14, please post it. Thanks

EDIT: Also, we put in a B16 ecu - p28 i think - and it did the same exact thing as the p13....whats so different? I had a diagram of the P14 and P13, but they are pretty much the same with the exception of the vtec pins. This is seriously draining me. <--but i guess once it's all done...it'll be worth the research.

SiRLudeVtec

bump...this is important

fastludeh22

iTrader: (1)

what injectors are you using?

2point2

the wiring should be exactly the same.. the p28 being the most watered down ECU (which is a good ecu to trouble shoot with).

is it a JDM p13?
are your running a resistor box?
injectors - did you swap them?
does the car idle?

... it's something really stupid. (it always is!! )

SiRLudeVtec

bump


yeah i figure it's something really stupid. The car idles really well....what's a resistor box...and its a JDM p13 ecu. I don't know the problem.

BUMP!! Need more peoples' oppinion.

Qfactor

try another P13 ecu, sometimes jdm ecus come with some troubles. I had a jdm ecu that was soaked with water from the inside. resistor box is located near the show tower small box with a heatsink. 4th gen ludes had them and prior years too but no the 5th gens.

SiRLudeVtec

I don't think that'll work. We tried placing in a b16 ecu and it did the same exact thing. There's something different about the ecus with vtec....i don't know what. How can the ecu with vtec affect the performance of the car in lower rpms?

vinuneuro

ur prolly running pretty lean with the p14. Watch out.

x_13

vtec wiring proabably is shorted to something. b16 has vtec, p28 has vtec, p14 dont so obviously it has something to do with vtec wiring. because p14 doesnt have vtec, connecting the vtec wiring to it doesnt provide any voltage to the vtec circuit.

2point2

^^ good point. but it probably would just shoot a code?

I would start off by unplugging sensors that you dont need for it to run half decent.. VTEC pressure, VTEC sol, EGR, knock, o2.... that will let you know if one of those sensors is giving the ECU bad feedback and/or a funny output. might want to also de-pin the vtec wiring (or any wires added) at the ECU - it could be wrong...

there is also an extra solinoid in series with the vacuum line that goes to the fuel pressure regulator on JDM H22A's.. the engine will run fine without it - do you have that plugged in to anything?

it wouldn't hurt to try another p13.. the p28 should have ran fine BUT it also would have ran rich..

SiRLudeVtec

can u bump this to the top....

no one knows the answer. I've tried everything....we need many opinions to correct this....I CAN'T be the only person with this problem....this has to be solved.

SiRLudeVtec

bump..

Greyout

so you're running around hitting VTEC with stock P14's, B16 ECU's, etc...

do you know how big the difference is in injector size between these engines?

<--- is guessing that the H23 injectors were put on the H22

kulrevon

yeah Id say make sure you have the h22 injectors and that they are the right year for that car. ie. obd2 or obd1. sturated or not

x_13

my first h22a swap i did bogg wit the p13 too i dont about the p14 cuz i didnt bother to try. my problem was wiring at the ecu. my car was a prelude s so i had to do more wiring. ks, tps, vtec, sb. those were all switch around at the ecu when i change those everyhting work perfect. tats might not be your problem but my point is check the wiring that you did.

SKDRCR

Are you using the h22 throttle body?

Try slapping your old h23 throttle body on.

Is the timing correct?

Which distributor are you using?

I don't think the problem lies in the vtec wiring or the ecu.

I had my car running on the jdm p13 ecu for 500+ miles with no bogging problems
after I set the timing correct.

T-King

Yea like they said above if it was something with the vtec it would throw a code,.... does it bog all the time or just until like 3200-3500? If it just does it until that rpm rang your timming is off, but cheack it any way it should be at 15 degrees at a 750 rpm base idel. If it isnt then bring it to 15 but make damn shure you jump the jumper under the center dash peace or it will go back to what ever it was at.

The only reason i post all of this is because my P13 did the same, but it was just the timing.


_______________
92 Si 4WS JDM H22a

SiRLudeVtec

Well - the CEL came on today, but i turned off the car to jump it, and it never came back on....Is the jumper piece blue?....I also tried using a paper clip - what do you suggest using?

BUMP

Silverpike

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AJBurks &raquo;</TD></TR><TR><TD CLASS="quote">Well - the CEL came on today, but i turned off the car to jump it, and it never came back on....Is the jumper piece blue?....I also tried using a paper clip - what do you suggest using?

BUMP</TD></TR></TABLE>
Are you sure the P13 ECU hasn't been chipped or tampered with? You are probably in limp mode on the P13. Is the P13 ECU a 4-plug unit? What does the sticker say on the side of the P13?

SKDRCR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AJBurks &raquo;</TD></TR><TR><TD CLASS="quote">Well - the CEL came on today, but i turned off the car to jump it, and it never came back on....Is the jumper piece blue?....I also tried using a paper clip - what do you suggest using?

BUMP</TD></TR></TABLE>

Yes it's blue and use can use a paper clip.

Stick the paper clip in theconnector when the car is off.

If the light doesn't blink but just stays on when turn the car on
then your not throwing any codes and you can check the timing.

SiRLudeVtec

Well, earlier, my CEL was on while i was driving....but when i went to turn it off to jump it - it wouldn't come on....I was hoping it would stay on because i'm trying to figure out this problem i'm having with my prelude.

SKDRCR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AJBurks &raquo;</TD></TR><TR><TD CLASS="quote">Well, earlier, my CEL was on while i was driving....but when i went to turn it off to jump it - it wouldn't come on....I was hoping it would stay on because i'm trying to figure out this problem i'm having with my prelude.</TD></TR></TABLE>

maybe you didn't have the paper clip stuck in the connector far enough.

SiRLudeVtec

YEP thanks....I did - and CODE 12 comes ... EGR Valve....can that be the possible cause of the problem listed above....now that i think about it...it kind of hesitates on the p14 also, but no where near as bad....thanks guys(for not being asses like others here on this forum).....this is what a forum is about...

Root79

Well, we have problem with EGR code on JDM H22A engine and ECU. But the engine work well and VTEC works fine. Idle was good too. On H22A engine EGR and Oxygen sensor heater have mutually connected. Check wiring.

So, did you have resistor box in injector wiring? The same symptoms we have when we install in B20VTEC JDM P13 345 cc injectors without resistor box. It was very hard to torn on engine, over fuel, and it just works terrible.

yOnKiNaToR

fix the problem yet?

i had the same problem and i had my injectors mix matched. i also had a ground unplugged and a bad 02 sensor.

did you check your injectors yet? the ones you need have a green/blue spot on them i believe (some one confirm this)

the only other things it could be are what the other ppl said.