What is an ECU, ignitor or a pulse generator?

[admin]

They work the spark that makes you go.

[admin]

More details to come.

[Guest]

An Engine Control Unit (ECU) also known as Engine Management System (EMS) is an electronic system which controls various aspects of an internal combustion engine's operation. The most simple ECUs simply control the quantity of fuel injected into each cylinder each engine cycle. More advanced ECUs found on most modern cars also control the Ignition timing, Variable Cam Timing (VCT), the level of Boost maintained by the turbocharger (in turbocharged cars), and control other peripherals.

ECUs determine the quantity of fuel, ignition timing and other parameters by monitoring the engine through sensors. These can include, MAP Sensor, Throttle position sensor, Air temperature sensor, Engine coolant temperature sensor and many others.

Before ECUs most engine parameters were fixed. The quantity of fuel per cylinder per engine cycle was determined by a Carburetor.

Thank you wikipedia.

On the older wings this controlled the firing of the coil, not much to do with the fuel.

[admin]

On the older eletronic ignition equipped Wings the ECU managed spark as well as ignition timing.

On carburetted Wings the ECU determined ignition spark timing by taking info from three sensors. The shift sensor told the ECU that the shifter was in 4th or 5th gear, the spark rate tells the ECU how fast the engine is going and the vacuum signal from the carbs tells the ECU how much load the engine is under. Then it would optimize these signals which would return best fuel economy and performance under all conditions by setting the best ignition timing for each circumstance.

On the injected Wings it gets a lot more complicated in that the ECU not only controlled the spark and timing but it also controlled the fuel rate and injection timing although it was a very simple system yet it still required a lot of components to work properly. A better fuel injection system would have O2 sensors in each exhaust pipes which would give much better feedback to the ECU and would raise fuel economy and lower exhaust emissions.

Take that Wickipedia. :lol:

[Guest]

Vic, when I slow down to go through a neighborhood and am in 2nd and sometimes 3rd at around 2500-3000 rpm's I get this spitting or backfire sound from the carbs.

This happens normally when the engine is cold without enough choke but it happens after warmed up to normal operating temp when I slow down and run in 2nd or 3rd. It never does this in 4th or 5th. How can I correct this?

[admin]

I'm guessing that the antiafterburn valve on the bottom of the intake manifold is defective, dirty or the vacuum hose is not connected to it.

You'll need to check this valve, but, unfortuantely the intake needs to come off to do it properly.

[Guest]

Thanks Vic, I'm planning to do that along with all new fuel and vacuum hoses when I replace the carburetor gaskets that I messed up by running B12 Chemtool through the gas.

I'm waiting for it to get a little worse because it still runs so good.

[admin]

You could raise the idle RPM a bit until you get the repairs done.

So many people just don't realize or appreciate how damaging some gasoline additives can be.

Gasoline is an excellent cleaner and if you run lots of it naturally through the engine you'll find that the carbs will stay clean on their own as long as you don't get dirt in the gas tank.

[Oregonwinger]

Like Vic says, and look at the Secondary air system reed valves, and related parts.

[William_86]

question... ECU is the same as CDI ??

[admin]

ECU=electronic control unit

CDI=capacitive discharge unit

Both manage spark in slightly different ways but almost the same.

[William_86]

ohh ok. so both devices do the same job in different ways ? hehe

the goldwing has cdi? or ecu?

[admin]

To make it easy to understand let's just say it has a little of both.