i swapped my h22a4 with a jdm h22a with a p13 ecu . and it was running good until the other day. i noticed a lot of hesitation when peaking around 4000 rpms. i just got a new distributor, ngk wires and ive had ngk iridiums on there for awhile . none are fauled and they all have spark so its not missing. can anyone help me please??!!

 

Reset your ECM. Pull out the fuse and replace. see what happens next.

 

Try reseting the ecu. Disconnect the negative terminal of your battery and let it sit for about 15 minutes. Hook it back up and see what happens. Good luck man!

 

Man what H22 doesnt have this problem? haha

Mine is doing the same...

 

Mines not lol but mines newer, I'm sure I'll run into this somewhere down the road. Lol

 

lol dont say that... Its one of the worst things ever!!!

 

it is a farely new motor, and didnt even think about resetting the ecm. thanks ill post back with the results

 

but whats weird is my gas mileage is going to severe S*** . so maybe a knock sensor????

 

maybe O2 sensor, valve adjustment, and/or fuel filter

 

you would think though if it was the fuel filter that it would do it constantly and not just at certain rpms . and i reset my ecu and that didnt help . im so lost!!!

 

O2 sensor could also be a good """GUESS"""

 

i bought some Iridiums... turned out to be junk. somehow they fowled out. may have spark but how strong? might wanna try getting some cheap-o- copper ones and try it again..... the simple things always bite you in the ***

 

This is either your knock sensor or valve seals OR your you have a EGR port clogged in the intake manifold. Good Luck. Mine is the Valve Seals.

 

i was thinking knock sensor. but jdm h22a's dont have egr.... or Do They?

 

yea i hear that im in the same boat only at 2-3k rpm

 

try the ICM in the dizzy this cured mine

 

Jdm h22a's do have the EGR system. Hesitation will most likely be from knock. Jdm P13's are programmed to run on high octane (96-98ron), anything less and you will get knock which means timing is pulled. What octane fuel are you running? I suffered from the same hesitation. Fuel pressure regulator (fuel pressure without vacuum is 43psi) and Safc2 was all that was needed to rectify it in my case (according to a dyno air fuel ratio, the hesitation was a lean spot).

Oxygen sensor will not lead to hesitation at WOT; if not working right you may bog/hesitate in low rpm's at something like 0-20% throttle.

 

well good news . i tried my timing. somehow it got advanced forward. and i run 93 octane all the time . never had a problem with it.

 

I had this same issue recently, i think my issues was injectors, because after running seafoam through the fuel system it cleared out the issue. Though my car still runs incredibly rich.

 

I agree, You need to run 92+ octane fuel. but I replaced my Dizzy, Knock Sensor, AND cleaned the EGR system, (YES IT HAS ONE, DRRR) and I still have the hesitation.. It's got to be a lean spot with a misfire.

 

Nothing a good shop with a DSO cant find. My old H22 Accord had a hesitation that turned out to be a faulty coil.

 

Quick question, how do you know its running rich? Smoke behind you when you floor it? Black soot on your rear bumper?

I assumed my engine was running really rich because of smoke and black soot but after getting it on a dyno I found it was running extremely lean (13.7:1 below 4.5k and 14-14.3:1 above 4.8K). Result, good torque figure, crap hp figure, heaps of smoke out back and a black bumper. Wasn't running rich at all, just dangerously lean with my knock sensor working over time and my ignition timing being permanently retarded!

I have found that hesitation means one thing, ignition cut. You need an air fuel ratio to know if its a lean spot. A misfire will trip a CEL, knock is corrected for on the fly.

 

I could very well be wrong on the terminology, I assume it's running rich due to the overwhelming fuel smell. Though the car is not putting out any abnormal amount of smoke from a prelude with no cat.