https://i.imgur.com/LpyHb2d.jpgi have a 2000 civic si with about 180k on it. i have had random misfires constantly. my acceleration seems to be very bogged down, like little to no power, so far i can not pinpoint what the problem is. it will do this right from start up to the point i turn it off. so far i have done, plugs, wires, and new distributor. when i pulled my plugs, cylinder 2 and 3 were terrible, one was charred, looked like from pre-detonation, the other one was black and covered in a sooty like material. i have searched these forums and so far i haven't found a clear answer. compression test everything was normal. two people have told me it is my crank positioning sensor? not sure how to test that or anything. any help would be appreciated.

 

hmmm. I came in to this thread to tell you it was the distributor lol. But since you have replaced it that probably aint the issue. Have any friends with obd2 distributors you could doubt check? In my experience misfires are caused by the things you have replaced. One thing you could double/triple check is are the plug wires in the correct order. Also check if the timing is set correctly, althought that generally only causes the vehicle to run rich/lean aka rough if it isn't set correctly.

 

Was there oil in the plug holes? A leaky valve cover donut can let oil leak in and cause a misfire

 

i have checked the plug wires and made sure they were all in the right order. and timing is set.

 

there was not any. i think the soot was carbon build up?

 

What were the compression test results?

 

What CEL codes are thrown?

 

I get misfire in cylinders in 1-4 and random/multiple misfires. I'll add a picture of what my plugs look like

 

When was the fuel filter last replaced?

Ohm test the coil and have AutoZone test the ICM.

Check for clogged fuel injectors.

Aren't the plugs new? Are they NGK? What brand plug wires and distributor?

 

I dont know about fuel filter. And how do I check the coil? And for the injectors just pull them out and look at the basically? Those plugs in picture are a year old. They were NGK. Distributor I got online from a Honda dealership in NC.

 

Did you install NGK plugs and OEM plug wires?

Coil testing - see Spark link in my signature and diagram in FAQs sticky.

Just replace the fuel filter. It's only about $20.

The white plugs indicate a lean condition for those cylinders.

You can remove fuel rail and inspect the injectors and also watch whether they properly spray fuel while cranking the engine.

 

Alright thanks, I'll let you know how that turns out! And yes I did replace with NGK plugs and OEM wires. And then what about the black on the one plug?

 

Could be just misfiring or oil.

Fix you current misfiring issue and then go from there.

 

But on the coil testing, why do I need to test that when I have a brand new distributor? Isn't the coil inside the distributor?

 

You don't have to do anything. New does not mean good.

yes