My 2000 acura 3.2 tl is misfiring. I've replaced the spark plugs. It starts and drives fine until you park for 5 minutes and when you go to start it up again, it misfires badly and sometimes won't start at all. But if it's parked for a few hours, it starts up fine...

bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.

just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?

you felt it or the OBD2 told you?
or both, ?
this a engine swap? 2000 Acura TL Mini?

misfires hot, or cold engine, or both,
in gear or not,idling, slow, fast or hills only, or all time?

Or just spark plugs or wires. Or Distributor/ignition. check the cheap things first. Also, replace your fuel filter.

the P0301 means Cylinder 1 Misfire Detected, and the P0303 means Cylinder 3 Misfire Detected. I think have known how to fix the problems after you knew where is the problem.

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mini vci for toyota tis

po303 is cylinder 3 misfire. I would start with cylinder #3 spark plug wire, look very carefully for chafed, worn or cracked spark plug wire, then check spark plug itself. If it is still acting up do a compression check on cylinder #3 to see if head gasket leaking.

If all that looks okay it may be the #3 fuel injector failure.

Read more: http://wiki.answers.com/Q/How_can_you_fix_PO303#ixzz1yD7OubjQ

Check and test injection system. 300 is misfirn random and 306 mifrie cyl #6

You've got trouble codes stored by they're most likely enhanced codes that your code reader can't read. Inexpensive code readers and only read generic trouble codes. Codes above P0800 are "enhanced" code that require a more professional scan tool to access.

More likely the ignition control module than coil hence the codes.

Regards

Lloyd Six

if you have a coil on plug system, or a waste spark system.... swap coils and see if the miss follows the coil.... voila... that'll fix it.

My TL would do the same, crank, crank, crank, give it gas, crank, etc, then finally, after everyone was looking at me like i was crazy, it would eventually start.
I noticed that strangely enough during this time, I filled up w/ regular gas at the same Exxon 3 times n a row, instead of going to shell like i normally do. (I used regular from shell or chevron in mine for 8 years & never a problem) Oddly enough,it would drive ok, kinda rough, for a short time then, i would walk out a store & it wouldn't start. I would give it gas while I was crankn it sometimes even until a cylinder would misfire & make that pop. when it would finally idle, just barely enough for me to put it n drive, i would step on it to keep it going. I even rode around for a week with that scanner hooked up to my car & the only code that EVER came up was cylinder misfire & only if i had to get on it & make it misfire. I put that fuel injector in my gas tank every time i filled up for about a month after the exxon fill ups & went back to shell & put plus instead of regular. We checkd the fuel pump, fine, the fuel filter, doesnt have one.
I have been fortunate to not have it happen since then but, I did some research on it & found that it could also be that the valve that controls the emissions, it would sometimes get stuck & not open/close properly thereby causing the engine to not be able to receive or give off the correct amount of air flow & therefore it wouldnt turnover to start until i would force it by giving it gas or making it misfire, or waiting a while for it to cool off.
Also, check out ur air compressor & make sure its not starting to go out. turn off the ac & see if it still sounds like ****. if it sounds better when its off then the fact that its going out causes it to pull more on the engine in order to keep it going. This could be why its running rough, like feels like its having trouble shifting in 3rd & 4th gears.
Just some advice I found helpful when I had the issue, dont know if its the cause of ur issue but, i thought I would let u know.....
I hope this helps ..... good luck!