black smoke

[Twinchy]

what does it mean when black smoke comes out from the exhaust ? it only happens when i punch it ( the gas pedal that is ). and my check engine light keeps coming on and off. could it be iam running rich, oil leak.....etc. can you guys help me out thanks

[1991S13]

The black smoke is because you are running too rich when you punch the gas. Also when you floor it, you burn off carbon deposits in the engine. Oil leaking past the pistons (blowby) would cause blue smoke.

[Twinchy]

what do i do to fix it ?

[steve s14]

if the smoke is from it being rich, you can check items that can cause that condition such as a faulty fuel pressure regulator, coolant temp sensor, air flow meter, etc. before you go into it any further, check the code in the computer, on the earlier cars, you can pull codes by getting to the ecu and turning the mode screw to get to mode 3 so you can retrieve the codes. this may point you right to the cause of the problem. if you don't know the proceedure for the mode screw method, let me know what car it is and i'll type it out for you.

[1991S13]

There is a good write-up in the FAQ section about retrieving codes from the ECU:

Here is how to on a KA24E: http://www.240sx.org/faq/articles/ecmcodes.htm

And here is the KA24DE: http://www.240sx.org/faq/artic...h.htm

Running some valve/fuel injector cleaner through probably wouldn't hurt every once in a while either, I usually do it every oil change. You can pick up a variety of different types from WalMart or an Auto store.