Okay so I thought that after I replaced the intake manifold gasket on my Type R that all my idling issues would be resolved. Most of the cold idle issues disappeared when I replaced the gasket but it was 20C outside today and I was driving around and when my motor warmed up and I had the a/c going in my car the idle would get all wonky and I can totally feel the car misfiring.

I've already checked my igniter connections and I've even used some dielectric grease on the connectors to make sure that they're passing all the juice that they can pass.

My next course of action is to replace the coil and the igniter. When I use an ohm meter to check things out they appear to be fine. Its usually when the temps get above +15C that I notice problems with misfiring. The coil and the igniter don't have any clear visible signs of cracking or anything like that so I'm absolutely stumped....

Wires and plugs are new and cap and rotor appear to be fine. I don't see any cracks or burn marks in any of these parts.

Can a coil or igniter work but kind of not work? Here's the strange thing: It only does this misfiring issue at idle and when I'm driving (or keep the revs up) its fine. Example would be where my RPMS normally sit at 1050 RPM (yeah its a bit high) but then after idling down it will go to like 750 RPM but there are clear signs that the engine and exhaust are starting to shake and well... misfire! If I let it try to raise up its own idle back to approximately 1050 RPM it will struggle to get to it and even then it idles like crap. Even my a/f ratio meter suddenly starts acting all funny. However, the moment that I start driving not a hint of misfire at all. Drives good at every RPM EXCEPT for idle....

When its cool out like 5C then the car idles just fine....

No CEL.....


help?

 

one more thing.... the car seems to always have a hint of unburned fuel smell and by hint I mean you can tell that its a little rich. When the misfiring comes along then all of the sudden it really smells rich.

Compression is good, valves are good, timing is good cat is good.

I doubt its an o2 sensor b/c the car drives just fine at all RPMS EXCEPT at idle when engine is hot and when ambient temps are above 15C.

Lastly, no matter how I adjust my throttle body idle screw once I plug in the IAC valve the RPM idles at 1050 RPM. Normally Hondas would idle at 750-850 rpm.

 

swap the wires with another set., inspect your plugs for fouling or a cracked plug as well

 

check for a vacuum leak or hook up a vacuum gauge to see if you have a small leak

 

did both a wire inspection AND a vacuum check. No leaks that can be found....

 

had this problem awhile back, then it just stopped, good luck!

 

i am in for more info too.
i set the timing to 14, 16, and 18 TDC and no help.

 

good to know that there are others that are having the same issue....

What on earth could possibly be causing this problem do you figure? 02 sensor would likely cause the car to run like crap all the time. My el cheapo auto meter a/f ratio gauge works fine as it was designed to when the car is running right but the moment that the car starts to act up all the a/f lights start lighting up and flickering and stuff and that is when I know I will have idle issues soon thereafter....

Once the motor cools off then its fine again...

 

check all your grounds (thermostat, transmission, and valve cover) and check your main relay

 

My motor bogs down during cold start ups from 1500 RPM to 1000 RPM then jumps back up to 1500RPM and bogs down to 1000RPM until the car warms up.. Is my motor misfiring or is this another issue? It's really annoying..

 

main relay is fine....

not sure why the heck my car still continues to misfire...

so stupid...