Ok I dont get it pulled the codes on my 01 prelude and got all four codes! Car runs just fine and those codes indicate a misfire but on all 4 cylinders can that be? Wouldn't I notice a sluggage performance. The CEL went off last night out of the blue but appeared again. Could this be a sensor problem if so which one?

I have already replaced the spark plugs, O2 sensor, and cleaned my egr valve.

Any help would be greately appreciated.

 

Plugs, Dist cap/rotor, plug wires, fuel filter, valve adjustment.

AFTER that, look here:
https://honda-tech.com/zerothread?id=2016969

 

Plugs were done, dist cap/rotor were done about 50k ago. Perhaps i'll try the fuel filter and valve adjustment...

 

Its still throwing the codes after the new 02 sensor and all?

That code can come from many different things, my car needs a new o2 sensor for sure right now, but it still throws this code sometimes, only on the highway at 65-70mph, very odd, its right around 4k rpm with my gearing, so maybe the IABs not being hooked up right now might have something to do w/that.

We shall see.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">Its still throwing the codes after the new 02 sensor and all?

That code can come from many different things, my car needs a new o2 sensor for sure right now, but it still throws this code sometimes, only on the highway at 65-70mph, very odd, its right around 4k rpm with my gearing, so maybe the IABs not being hooked up right now might have something to do w/that.

We shall see.</TD></TR></TABLE>

I am having the same problem, and I can't understand why it only happens around 65-70mph. Also, I was driving in 5th gear with the cruise control set just below 80mph and I was throwing codes every 5 seconds. The weird thing is there was no noticible change in power or rpm's. I was thinking about a valve job but I don't know if that will help since I am running a H22A, instead of a H22A4.

 

I had the same exact problem for a little while. What I did was change the plugs, cap and rotor, valve adjustment, clean the EGR and IAC valve, ran a little sea foam, and it cleared it up...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelude1897 &raquo;</TD></TR><TR><TD CLASS="quote">I had the same exact problem for a little while. What I did was change the plugs, cap and rotor, valve adjustment, clean the EGR and IAC valve, ran a little sea foam, and it cleared it up...</TD></TR></TABLE>

Well the only thing I have not done is a valve adjustment!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BB6DR &raquo;</TD></TR><TR><TD CLASS="quote">Ok I dont get it pulled the codes on my 01 prelude and got all four codes! Car runs just fine and those codes indicate a misfire but on all 4 cylinders can that be? Wouldn't I notice a sluggage performance. The CEL went off last night out of the blue but appeared again. Could this be a sensor problem if so which one?

I have already replaced the spark plugs, O2 sensor, and cleaned my egr valve.

Any help would be greately appreciated.</TD></TR></TABLE>

i bet you 1000 dollars that your codes aren't o2 lean or rich. I just went thru this, because you doing the obd2 blink codes, your getting a 71 72 and 74. when in reality if you checked it with a scan tool it would tell you cylinder 1 missfire cylinder 2 misfire and ignition system malfucntion. change you plugs cap rotor and wires, like v said above.