Alright, now that I have finished fixing my vacuum hose issues and my wiring issues, I now have another problem to deal with.

Recently, I swapped a jdm h22a into my si. I swapped over the fuel rail from my h23 of course and kept the h22 injectors. I did some research and found that supposedly the h23 has a higher fpr psi than the h22a. I checked my plugs today and they were pretty darned carbonized, which means that I am running too rich. My question is will swapping the the h22a fpr make that much of a difference? I do know though that stock h22s tend to run a little rich but not as rich as I am running.

Also, some things to consider is that I am using crappy autozone plug wires for now till my ngk wires come in. I am using the ngk plugs though. My car has kind of a bouncy slight hesitation when I accerlerate through 2500-3500, usually only when it is completely warmed up. I know that running too rich will inhibit the h22 from running at its best, but will it make the acceleration slightly bouncy. My o2 sensor is from the previous h23 engine and I have never had any problems with it. So, I dont think it is the oxygen sensor, but I could be wrong.

Oh yeah, I am running the stock h23 harness with a usdm p13 ecu.

Sorry for the book guys. Any help would be appreciated.

 

The FPRs on the H23 and h22 are the same.

Your problem lyes else where.

Start by checking your TPS. If you have an exhaust leak that too will alter your A/F readins.

 

slight hesitation between 2500-3500 when warmed up sounds kinda familiar. do you have a CEL by chance? irradic idle maybe?

 

The hesitation is probally a clogged EGR.

 

no i dont have any cel's. I could have an exhaust leak, and I could clean my egr and see if that helps.

 

Actually the fuel pressure regulators are NOT the same... Manual states that NON VTEC fuel pressure should be 37-44psi, VTEC fuel pressure should be 33-40psi. Part numbers are also different. So you are most likely running rich because of the slightly increased fuel pressure.

PS- Please do your research before supplying incorrect information...


Modified by no1knows908 at 4:12 AM 8/25/2008

 

^Yes, that's exactly what I read too.

I'll have to run by the shop tomorrow to pick the other fpr up, and then I'll clean the egr, and hopefully get my ngk wires installed. Then I'll report back. Thanks for all of ya'lls help.

 

UPDATE UPDATE UPDATE:

So, I have swapped out the fpr to the h22 fpr. I have cleaned my egr valve, and I have also replaced my fuel filter. None of this has helped the hesitation problem from 25-3500 rpms when fully warmed.

Now my next question would be, would running a usdm ecu tuned for the lesser powered usdm engine cause the hesitation since i have the jdm engine. I have done research to see if anyone else has had this problem, and all I could find was where a guy ran a chipped p28 and tuned it and the problem was solved. However, I am trying to stay factory with my hardware. Does anybody have any ideas? Thanks for all your help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by juniorlude &raquo;</TD></TR><TR><TD CLASS="quote">UPDATE UPDATE UPDATE:

So, I have swapped out the fpr to the h22 fpr. I have cleaned my egr valve, and I have also replaced my fuel filter. None of this has helped the hesitation problem from 25-3500 rpms when fully warmed.

Now my next question would be, would running a usdm ecu tuned for the lesser powered usdm engine cause the hesitation since i have the jdm engine. I have done research to see if anyone else has had this problem, and all I could find was where a guy ran a chipped p28 and tuned it and the problem was solved. However, I am trying to stay factory with my hardware. Does anybody have any ideas? Thanks for all your help.</TD></TR></TABLE>

You can still have a clogged EGR and not throw a cel. The cel on trips when the Lift valve doesnt lift.


And my FPRs are both the same. I have both motors.
None Vtec motors can also be the F- series motors.

Ive used the FPR off the h23 on my h22. They are the same, and can be used on each other.

Forget reading it, I have done it physically.

 

Im going to say its your EGR ports that are clogged.

P.S.
The fuel pressure systems for the H23 and H22 are diffrent. Starting at the Fuel filter and Fuel pump, they both pump the ammount of fuel into the fuel rail. Then it is pressurized according to the ammount of manifold pressure. And the H23 manifold is smaller in volumn compared to the H22. From the TB to the runners the smaller volumn will cause a higher presure on the SAME PART!


Modified by Acidcrakker at 4:05 PM 9/1/2008

 

Not trying to butt heads, but I too have the h23 engine and the h22 engine sitting with me. The fprs are not the same. The inlet for the jdm h22 fpr is smaller than the h23 inlet. Now whether or not that actually makes a difference on the fuel pressure, I don't know enough about that, but they are different.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Acidcrakker &raquo;</TD></TR><TR><TD CLASS="quote">Im going to say its your EGR ports that are clogged.

P.S.
The fuel pressure systems for the H23 and H22 are diffrent. Starting at the Fuel filter and Fuel pump, they both pump the ammount of fuel into the fuel rail. Then it is pressurized according to the ammount of manifold pressure. And the H23 manifold is smaller in volumn compared to the H22. From the TB to the runners the smaller volumn will cause a higher presure on the SAME PART!


Modified by Acidcrakker at 4:05 PM 9/1/2008</TD></TR></TABLE>
fuel pressure is not regulated by the size of the plenum. that has nothing to do with it. fpr are rated by the diaphragm and the way it acted upon during vacuum. what you have told this guy means nothing. and if he had an egr problem it would be throughout the power band. spark knock. too much heat. this could be anything. how can you say anything like tps or egr? these are just confusing, tps going to throw a code if out of spec. fpr is not ported vacuum it is direct, manifold pressure is vacuum, atmospheric pressure. you cannot create more vacuum, but you can control it, meaning it doesn't get bumped up in pressure unless a force is acting on it ie boost. if the port is clogged ie pintle stuck, lift will be present when it won't seat. yes, it will. i run h23 fpr and it's fine. pressure is fine. but what you have said makes no sense. vacuum fills a void, open door, fill void. that's all dude.