* Rich Fuel Mixture: A malfunctioning ECM might deliver too much fuel to the cylinders. This unburnt fuel can then be expelled through the exhaust, causing visible smoke (usually black or dark grey smoke). This is a common consequence of a faulty ECM affecting fuel delivery.
* Misfires: A faulty ECM could lead to misfires. Persistent misfires can lead to incomplete combustion, which results in unburnt fuel entering the exhaust, again causing smoke. In addition, prolonged misfiring can overheat the catalytic converter, leading to white smoke (though this is less likely to be the immediate result).
* Incorrect Ignition Timing: The ECM controls ignition timing. Incorrect timing can also contribute to incomplete combustion and therefore smoke.
However, it's important to note that smoke can be caused by many other issues, including:
* Blown head gasket: This is a very common cause of smoke, especially white or milky smoke.
* Worn valve seals: This often causes bluish smoke, especially on startup.
* Failing turbocharger: Oil leaking into the combustion chamber can cause blue smoke.
* Leaking injectors: This can also lead to excessive fuel in the combustion chamber, resulting in black smoke.
In summary: A bad ECM *can* contribute to smoking in a 1986 Chrysler Lebaron Turbo 2.2L by creating a rich fuel mixture or causing misfires. However, it's crucial to diagnose the problem correctly. Smoke color and other symptoms will help narrow down the possibilities. It's highly recommended to have a mechanic properly diagnose the issue rather than assuming it's solely the ECM.
