I recently just bought my first 91 crx dx with a dpfi to mpfi harness conversion...i swaped in the 99 d16y8 which i got for $200 dallors from a junkyard ...when i give it gas driving down the road it cracks and pops at high rpms and when i got the car the interior wiring harness was all ****ED UP what would be the reason why it sounds like it miss fires? its throwing codes 10,16,8,and 9 i looked them up and it says one of the injectors is wrong we messed with it a little and i think i got it cuz it sounds good but still cracks and pops? oh and its OBD0. thanks could really use the help.

 

Start working on clearing your codes.
#10 should be the easiest and it might clear your other codes if your wiring is all wrong.

BTW: what ECU are you running?

 

im using a pm6 si ecu vtec is not wired up i know, im waiting to get a pr3 does the cps (crank position censer) have to be plugged in? sorry for all the questions this is my first motor swap... i traded ecus with my bro his pm6 and it sound like the valves float at 7k, is this because there is no knock sensore cuz i heard these motor can rev to 8k no prob....and another thing my cluster was stolen so no guages ****in sucks camel dick!!!!! tmro we are going to clear up the codes will it hurt the motor to drive it with codes flashing??

 

I thought that those were obd2 uless you used a jumper! when you say it cracks and pops(im asumming you mean backfire) check to see if timing is off!

 

with the code you are getting and he performance of the engine, I would say yes.

So all you have done is a DPFI to MPFI, correct?

What injectors are you using (OBD0 or OBD1, OBD2) are you running a resistor box?
What distributor are you using? You SHOULD be using one from a 88~91 MPFI car like the Si or Hf. Those are MPFI. The Y8 distributor will not work with that ECU.

 

i know what im doing everything is obd0 and yes of course there is a resister box, it wouldnt run without one...the timing is not off at high rpms it sounds like its not getting fuel does anybody havethe same problem???

 

oh and i think you dont really know what your talking about so does anybody else know of anything that would help?? EF( GUY please do not give me any answers cuz you dont know what a pm6 is or about resister boxes or obd2 injestors ...why would i put those in my car???

 

For having 5 entire posts to this site, you may not have seen what people have done to their cars. People HAVE tried mixing OBDs.

You CAN run OBD1 or OBD2 injectors with your PM6, but you can NOT run them with a resistor box.
You can also run OBD0 injectors, but obviously you HAVE TO run the injector box.
So I was just checking.

Assuming you do have it all squared away with the proper injectors (you are throwing injector codes) and proper distributor (you have codes for that too)
- then your wiring needs fixing- it's messed up.


Reread some of the posts above and I'm not sure what you meant about messing with one of your injectors.
Did that somehow clear codes? I can't imagine code #10 clearing with an injector problem.
With the IAT anyway you eithr machined the intake manifold or did you poked a hole in the intake tube. Should be really easy to trouble shoot.

 

each injector has 2 wires coming from it 1 of each of the four wires goes to the ecu, and the other 4 go to the resister box correct...they where soudered all ****ed up i cleared it up it ran strong but still seemed to choke you know what im sayin. and then i turned it off and electrical taped everything and started it it started choking again...at high rpms like not its not geting fuel at high rpms...any ideas im willing to try everything...and am i supposed to hear the valves at all??