Hey guys, I just had a mechanic do a JDM h22 swap on my 95 prelude.
The car does not run right on the P13 ecu. It has a severe hesitation and it backfires through the intake. It seems like it is out of time. The car runs decent on p14(h23) ecu. I was wondering if the cam timing could be off?

 

there are a **** ton of thing that can cause that issue. veify you have the firing order correct. is it obd1 engine or obd2 and which distributor do you have in the vehicle. obd2reads crankshaft sensor data, obd1 does not,
. more information needed here please

 

The firing order is right.
the engine is OBD1 the ecu is too.
I just replaced the knock sensor on it.
The distributor is from the h23 (the external coil dizzy)
the fuel injectors are h22 injectors.
Vtec is wired correctly

 

timing verified? Compression verified?

 

check your cam timing, and check your firing order again lol. it isnt that hard to find tdc on compression stroke. pull of top cover. remvoe number one plug. raise piston to top of cylinder. verify marks are aligned. yes maybe 1,3,4,2, but is it in correct order on cap. a backfire, miss, hesistation of that magnitude is usually one of the two problems. did the tech do the timing belt before replacement? if so check on it, he may have it out 180, kind of sounds like it. doesnt it start relatively easy? compression wont give you a hesitation it would give you shitty power and a hell of time starting it. not a misfire or backfire. will bounce around but only from the irregular frequency the engine is producing. sounds like intake valve is opening during ignition causing a backfire. most likely from cam timing, but is either of the two for sure. let me know how it goes.

 

i have the same set up, with an h22a4 engine. p14 only is relative in injector on time and valve are open for 180 degrees i on h23 so introduction of gas is at different times during the revolutions of the two engines as far as on/off time. this is more than likely why it runs better n p14. check you cam timing i think your one the right track dude, definately sound like igniton during intake valve opening

 

thanks guys...im about to check the cam timing out right now. I will let you know how that goes

 

once you verify the cam timing, be sure to set the ignition timing as well

 

well i just checked the cam timing and it seems like it was off...When i had the cams at TDC the 4th cylinder was at TDC. the rotor was pointing to the 1st cylinder though.
The ignition timing is set properly.

 

Even easier thing to start at for ***** and giggles. Switch to a P28... And get it tuned of course. But the eliminates the knock sensor... Even tho you said it is new, its nice to do away with since it can cause so many problems.

 

I dont see why i should even waste the money on a p28...i have a working p13 that should run the motor fine. a p28 with a h22 basemap would be pretty much the same thing IMO. Yea i would have the knock sensor disabled but that is not the problem in this situation

 

If you already have the covers off to check the cam timing, you should be able to verify the crank position as well. If the physical timing is an issue, get that fixed first of all.

Now if the car runs fine on the P14, the issue could be the P13. I would see if the ecu has issues on another H22 OBD1 car, and go from there.

 

did the lude have a vtec or an h23 before the swap?

the JDM H22a has an internal coil
the USDM has an external coil

it is very simple to convert from external to internal, just clip the green wire from the dizzy harness and then clip the black w/yellow stripe wire and splice them to run the internal coil.

also double check the vtec wires to your ECU.

VTEC oil pressure to D6
Knock Senor to D3
VTEC Solenoid to A4
IAB Solenoid to A17
IAB 12v+ to power source hooked to the ignition
and ground wire to a good ground.

there are 4 wires to add to your ECU and two to swap and it is very easy to bend the pins on the ECU.

I picked up a sub harness for my conversion if you would like the info where I got it I can pm you. I would post it, but I don't want to "advertise" for a vendor if they don't pay HT for advertising.

Good luck I do have swap guides and diagrams if you need.

Let me know.

 

Verify you actually have the H22 Injectors on the car.

To me it sounds like the H23 injectors are on the H22. Thats why the P14 runs fine, but the P13 does not.

 

i totally missed this post.

you need to set the cam timing properly. i find it hard to believe that the ignition timing could be right if the cam timing was off. remove the t-belt, turn the cams and crank to tdc and reinstall. then set ignition timing