[Jklad]

When changing spark plugs, is it necessary to remove any fine dirt that builds up around the hole? I have some fine grime in a few and what looks like a hair or thin leaf in one.

If yes, how do you go about cleaning these ports without the crap falling through the hole? And is it bad if any falls through?

Please excuse my lack of proper terminology!

Pics below:
Last pic is c2, 4 5 6 (1 and 3 were changed in the ost six months)

[RealJ22]

I mean yes and no. There are always going to be debris that fall in that you will not be able to catch. Use a vacuum / sprayer head if there is oil or crap built up and try your best to get everything out.

You just want to minimize it. Who knows with this engine lol. Some have been abused and run forever while others have been meticulously maintained and blow up out of no where.

[Jklad]

I ended up using these small detailing attachments for my shop vac and was able to vacuum out around 60% of the debris from the above photos. This seemed good enough to me, so I installed the new plugs and torqued then down no problem. Car fired up and runs great (knock on wood).

[Jklad]

In case it helps anyone:

Background:
4 months ago i replaced c3 plug and coil due to a misfire.

4 weeks ago, got new replacement Mitsubishi's installed. Immediately got a c1 misfire, so replaced plug and coil and car ran great.

Last week ago I got 4 codes for misfire c2, c4, and c6, along with the accompanying "misfire multiple cylinders" code (no duh Ecu!).

Initially I overreacted like usual, I thought this was it, it finally happened, I finally blew the engine haha. car ran like shit exiting the highway and for a few blocks, could barely accelerate, ses light flashing anytime I gave it gas. Pulled over, absolutely no smoke from exhaust, no smoke in engine, no fluids spilled, belt still on, etc.
Turned car off, cleared the misfire codes, and turned it back on, little rough start and ses light gone. Babied the car home for 13 miles, no smoke, no ses, and parked in garage.

Since there were no other codes accompanying the misfire codes, and the cylinders that misfired still had plugs with 45k miles on them, I went ahead and replaced my remaining 4 plugs and coils that I had planned on doing at some point anyways. The old plugs were shot (as you can see in the above pics). I test drove for a while (aka beat the crap out of the car in various conditions for 30 mins) and it's running great again, no issues.

[Newb_bimmerE92]

Originally Posted by Jklad

In case it helps anyone:

Background:
4 months ago i replaced c3 plug and coil due to a misfire.

4 weeks ago, got new replacement Mitsubishi's installed. Immediately got a c1 misfire, so replaced plug and coil and car ran great.

Last week ago I got 4 codes for misfire c2, c4, and c6, along with the accompanying "misfire multiple cylinders" code (no duh Ecu!).

Initially I overreacted like usual, I thought this was it, it finally happened, I finally blew the engine haha. car ran like shit exiting the highway and for a few blocks, could barely accelerate, ses light flashing anytime I gave it gas. Pulled over, absolutely no smoke from exhaust, no smoke in engine, no fluids spilled, belt still on, etc.
Turned car off, cleared the misfire codes, and turned it back on, little rough start and ses light gone. Babied the car home for 13 miles, no smoke, no ses, and parked in garage.

Since there were no other codes accompanying the misfire codes, and the cylinders that misfired still had plugs with 45k miles on them, I went ahead and replaced my remaining 4 plugs and coils that I had planned on doing at some point anyways. The old plugs were shot (as you can see in the above pics). I test drove for a while (aka beat the crap out of the car in various conditions for 30 mins) and it's running great again, no issues.

It really sounds like you may have an injector on its way out. If this continues to come back, you will likely have to replace an injector. This is exactly how my issue started and eventually had to have it towed because it wouldn't run without eating fuel. Smelled like gas was being dumped out the exhaust, had terrible white smoke. Albeit, it could be other things but a bad injector is a good possibility.

[Jklad]

Originally Posted by Newb_bimmerE92

It really sounds like you may have an injector on its way out. If this continues to come back, you will likely have to replace an injector. This is exactly how my issue started and eventually had to have it towed because it wouldn't run without eating fuel. Smelled like gas was being dumped out the exhaust, had terrible white smoke. Albeit, it could be other things but a bad injector is a good possibility.

I'll definitely keep an eye on it. Luckily car has absolutely no smoke (except for a bit of normal
Morning condensation), and seems to be running great.