[hgray77041]

if I am not mistaken, both a 92 Prelude and a P28 ecu are obd1 and should have Peak and Hold injectors with a resistor box

 

[Euro92si]

Its my understanding that any obd1 ecu will run both lower impedance and high impedance. That both set ups end up falling in a similar spec once the resistor box does its thing. The ecus only job in it sending a ground pulse to fire, the resistance side of things is on the hot side.. idk.. But regardless of that, me getting 14 ohm out of each injector does mean saturated and shouldn't need resistor box correct? This is my 1st go around having to deal with it. Im gonna mount a fuel pressure gauge today and possibly wire the resistor back for testing

 

[hgray77041]

I am totally not mechanical, but did come across info on Reddit about injector plugs

 

[Euro92si]

Hmm, thats interesting. Which if you think about it, tuning wise i know to some level you can control/tune how much fuel they're getting/spraying so maybe its not just a simple off/on pulse like I was thinking. Maybe the pulse can be weak to strong. Idk. Getting a little out of my normal ability now

 

[1funryd]

We are missing a lot of info here.
What is the engine harness you are using?
You are stating that you think the injectors are saturated due to them ohming out at 14ohms.
And you stated that prior to this rebuild the motor ran perfectly as is until you did the rebuild?

Something sounds way off with your description.
Please start of with a detailed description of what you had prior to the build and then what you did during the build with what parts and what did you touch, step by step.

 

[Euro92si]

Its been pretty detailed, but ill go over it all once more.
1. 92 si with jdm h23a bluetop swap
2. wire tucked oem harness.
3. It was already swapped and everything when I got it. It had a bottom end noise. I bought another h23a bottom end because my cylinders were hurt.

4. Full rebuild using my original head.
5. Yes the injectors all ohm to 14 which indicate that they are saturated and do not require resistor box although it was running great with the box in place.

6. I finally put a fuel pressure gauge on it an hour ago.
Fuel pressure is good.

7. Wired resistor box back in and it tries to run more with it hooked up.
I can actually force it to climb rpm and all, its just rough.

8. I am now thinking maybe the high impedance injectors running with the box maybe hurt all 4 of them somehow.
9. Im currently at my local junk yard to grab some injectors to try.
Its getting down to fearing ecu, although I have injector pulse.. I've tried my very best to document every step of the way throughout all this.

I very well could have missed something though

 

[Euro92si]

Its the injectors. I put some f23a1 injectors in just for testing, not the best fit but they plug up since I was running the bluetop injectors. Bypassed resistor box again. It cranks, idles, drives, but not 100%. Im assuming it just simply doesn't love the f23 injectors.
Best guess I have is the bluetop injectors running on a box basically burned them all up, idk. But at any rate, finally on the right track.

 

[1funryd]

Ok, I itemized what you did to break up the step by step.

So running the injector box on a saturated injectors somehow still allowed it to run normal but over time did do damage to the injectors from what we are seeing you are saying.

Glad to see that the junkyard injectors helped point you toward a more focused solution.
Let us know once you get some proper injectors and test whether that fixes your issue, so we can call this resolved and edit your first post and the title so this whole thread is useful to all on the site.

 

[Euro92si]

Will do for sure, this one was definitely a head scratcher for me, and I really appreciate everyone that tried to help. This was my 1st time truly relying on this forum. The best solution i can come up with is either A: buy h22a4 injectors or B: send off the h23a injectors to be rebuilt (I've never had that done). Best i can tell from research the a4 injectors are roughly 20cc smaller, idk if that would be cause for concern or not though.

 

[hgray77041]

if it is helpful, from what I can see, the part number for H23A injectors for a DOHC vtec engine is: 06164-PDE-E00. I have not identified a replacement part number

 

[Euro92si]

That could possibly be very helpful. Im gonna try my best to have the correct ones. I know a4 will work but still. Thank you

 

[hgray77041]

I'm sorry I didn't come up with an exact new part number -- it may be worth a call to NGK to see if they can come up with a good fit

 

[Euro92si]

It should at least help me track it down for sure. I never realized how hard it is to get specific parts for jdm engines

 

[Euro92si]

OK, pretty definitive conclusion here.
1st off, avoid all of my troubles and start with getting an actual fuel pressure reading. It would've saved me an incredible amount of time and a small amount of money.
2nd, if you go to change your fuel filter and discover its in terrible shape, don't Just let it go and move on. I feel my testing was pretty good minus working with no pressure data, but I missed a huge tell. The filter was trashed, looked like mud water, i cut it open and the element had broke off, rust and debris everywhere. What i didnt catch at the time was all that crude made it to the injectors/little filters in injectors. Today I replaced the injector filters and soaked them in some cleaner. She runs like a top now, smooth as can be.
Hopefully this mess of information will help someone in the future. Thanks for any and all help on here.

 

[Play Rude]

Way to go man. I knew you could figure it out. Thanks for sharing your resolution!

 

[hgray77041]

could the problems describe result from a vacuum leak?

 

[Euro92si]

Yes actually. Probably very similar issues, plus the air sucking sound. One good way of checking is take a small propane torch and Crack it open, run it around suspected areas. Be looking for either it to rev, stall, miss.. etc. Then you're on the right track