h3rsh3y2001

All 4 cylinders have been misfiring for several months and I've done eveything I could do, I've replaced all 4 spark plugs, spark plug wires, cap and rotor, I've also found out that the AEM cai did not fit on the throtle body and the egr valve but I bought smaller clamps and fixed that issue too.

I have an 01 prelude thats has the H22a4 motor with a 4 speed auto and I have no idea what more I can do to fix this problem, can anyone help?

97ludedude

how bad does the car run? it could be several things. low fuel pressuer (bad pump or clogged fuel filter) bad ignition coil, bad ignition control module (igniter) could be a bad catalitic converter. what brand spark plugs did you use when you did the tune up? When is the last time it had a timing belt put on? Is p0300 the only cel?

jyracer

i had the same problem. my EGR ports were clogged and made cylinder #4 misfire while idleing

lude98SH

hmmm egr shouldnt be active during idle unless somehow it was stuck open however its vacumm operated and electronically controlled so idk how that would happen.

lude98SH

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97ludedude &raquo;</TD></TR><TR><TD CLASS="quote">how bad does the car run? it could be several things. low fuel pressuer (bad pump or clogged fuel filter) bad ignition coil, bad ignition control module (igniter) could be a bad catalitic converter. what brand spark plugs did you use when you did the tune up? When is the last time it had a timing belt put on? Is p0300 the only cel?</TD></TR></TABLE>

On top of those I would mention o2 sensor, primary only. Secondary doesnt control mixture.

h3rsh3y2001

I put in Bosch plugs, I'm assuming the belt was changed by the previous owner cause the car was in really good shape and the carfax report came back excelent as for the code, I dont even remember all I know is 5 codes pop up, 1 for each cylinder and then a random cylinder code.

you can here it really bad in the 500-2500 RPM range, it almost putters if you keep it at a certain rpm with out exceleration and once I say the cel go ape **** when I did it.

vinuneuro

Use oem (NGK) plugs and wires. Bosch plugs are known to cause problems in Honda's.

Use good gas like Shell, Chevron, etc.

Go through this thread: https://honda-tech.com/zerothread?id=2016969