black exhaust pipe (1 Viewer)

[Hungale]

Hi everyone,
Do you think it's normal that the inside of the tube is so dirty?
When I start the engine, black condensation comes out and dirty the floor.
3FE engine fully desmogged.

 

[Spook50]

Yep totally normal. There's always going to be buildup on the inside of your exhaust, especially if you have no catalytic converters to burn most of it up while driving. I've been desmogged for 15+ years and the inside of my tailpipe looks like that too. Never any problem.

 

[Hungale]

Thank you very much, I thought there was some fuel injection problem

 

[Seth S]

Thank you very much, I thought there was some fuel injection problem

Do you have excessive black smoke when accelerating? Or noticeably lower fuel mpg?

 

[Hungale]

No smoke,
18-19 l/100km

 

[cps432]

You’re running rich. This happened to me for about a month before my engine got so coated with carbon build up internally that it stopped idling.

I pulled the engine and the pistons and top of the cylinder walls were caked in 1/8” of rock solid carbon. Took days to get the pistons out of the block because it was so bad.

Check your spark plugs. If they’re fouling you may want to run a tune up on your engine. Also, may want to think of a carbon cleaning solution for your internals if your spark plugs are black.