323i Fouled a plug so it wouldnt fire in three days.

[MR.Camel]

Hi guys, weird one for you.
My M20 323i started feeling REALLY unhappy - big vibrations, weird sound and quite slow.

I thought it might have dropped a cylinder so took it to a mechanic that had put new plugs in 3 days ago. Turned out that cylinder 6 had fouled the plug so bad it wouldnt spark.

Any idea what could cause this?

Also I think there is something weird going on with my feul pump, it makes a weird noise - sounds like an electric motor - when the engine is running. Could this be the reason it's fouling so easy?

Thanks guys and happy driving - E30s rule!

[accident]

Did you take off the valve cover to check for broken rockers? Is there smoke coming from the exhaust yet?

[MR.Camel]

runs fine on all six at the moment but I guess in a couple days the plug will foul again and not be able to spark. This rules out the broken rocker doesn't it?

[Sagaris]

Is it fouled with oil, gas, coolant? im going to take a guess and suggest that it could be a leaky / bad injector on that cyl. If you want to diagnose that, switch that injector to another cylinder and see if the other plug fouls.

[SpecM]

feul pump, it makes a weird noise - sounds like an electric motor -

well, with the back seat out it will sound like this

ask the mechanic if the plug was fouled with oil or gas