It is an 06 evo with 24K miles on it.

When my engine is cold and I start my car initally everything is fine. If I give it a quick little bit of gas the RPM's drop, the engine sputters (like it isn't running on all cylinders) and I get a decent amount of blue-black smoke. After 10 seconds it returns to normal. If I give it gas slowly everything is fine and there is no problems at all. No smoke no nothing. Is this normal? The car is throwing a P0300 and sometimes a p0301 code. Spark plugs are coming in tomorrow so that will be my first step. Is there anyway to easily check the fuel injectors? Could it be the fuel injector if it only happens when the engine is cold?

 

Valve Seal is my first guess.

 

Wouldn't that cause the smoke everytime I start the engine when it is cold though?

 

Yeah good point. Also the smoke would probably be light white smoke.

 

It might just be that you need new spark plugs, the blueish smoke is a sign that something might be wrong with the turbo. also It might an Injector.

 

blue smoke=oil

I know that, but it is dark and notihng with that senario makes since with me. If it would be the turbo it would be under boost?

Being that it has to do with throttle input I was leaning towards plugs or injectors.

Is there anyway to check the injectors without sending them to be checked/cleaned by a shop?

 

It's probably not valve seals if you say there's no smoke and the car runs fine when first started. It happens when you rev the engine so my guess is it's throttle position sensor, MAF, or injectors. The smoke is from a rich burn.

And can you say what those check engine light codes are rather than just the code?

 

I second the valve seals.


S

 

Its not the throttle position sensor or MAF.... I can log that. My LC-1 is being a ***** and I think I need to just buy a new wideband to check my AFR when this is going on. I am not really "reving" it so to speak. Just enough throttle to raise about 1K RPM's or so. I just wanted to clear that up so people dont think I am reving to like 5K or anything when I first start the car. lol.

The check engine lights are:

P0300: Randon cylinder missfire
P0301: Cylinder #1 missfire.

These codes are known to be very familiar with a lot of evo owners and could very well be from other things. It is a reason for it not being TPS of MAF related. It also makes you point to plugs, injector, valve seal as it might just be the #1 cylinder.

You guys that are saying valve seal, I thought if the valve seal would be bad it would always smoke on all cold start ups. I can make it smoke and sputter on command, not when the car feels like it.

 

Mr?

 

Yes

 

Just wondering because of the TSB's out for the MR and those codes. Tranny shouldn't make it toss smoke though.

 

Do you know which TSB's? any links?

 

They were posted up recently, at least were mentioned in a few threads. Search on your codes, I would but I'm in stupid SANS class ;(

 

Replaced the plugs. Didn't fix it though. Old plugs looked ok, at least like they should for 24K miles.

I guess the next step is buying a new set of injectors.

Still trying to research a TSB, but found nothing that gives details on how to fix the problem.