TFI problem - estrange noise coming from distributor.

[TheRipper]

Hi! I have a MS1 v2.2 plugged in a Ford Escort with TFI module and distributor. I´ve mounted the MS board inside the original Ford ECU case, and used all the original sensors and wiring. It´s working fine, but in some cases, with the ignition on (motor off), there´s a strange high frequency noise coming from distributor, and the tacho shows very high RPM, moving beyond the scale limit of 7k RPM The noise is a little loud, I can hear it inside the car. Any idea of what is going on?

Thanks.

[TheRipper]

Today, I realized that the thing happens mostly when the throttle is open! I think that could be a signal noise from TPS, but I´d never seen anything like that before. Any ideas?

Thanks!

[damon308]

Hi! I have a MS1 v2.2 plugged in a Ford Escort with TFI module and distributor. I´ve mounted the MS board inside the original Ford ECU case, and used all the original sensors and wiring. It´s working fine, but in some cases, with the ignition on (motor off), there´s a strange high frequency noise coming from distributor, and the tacho shows very high RPM, moving beyond the scale limit of 7k RPM The noise is a little loud, I can hear it inside the car. Any idea of what is going on?

Thanks.

Hi Ripper, with your Motor not running should not all power be cut ?? so I would check your wiring ?< Regards DM

[jsmcortina]

With TFI (and EDIS) you need power to the module at "key on, engine off" or else you would never get a tach signal.

James

[TheRipper]

Hi, Damon! As jsmcortina said, TFI module needs power to generate tach signal to MS.

Something I forgot to mention is that there is NO tach signal when the thing happens. The MS is sparking without a tach signal, but when I turn off the Spark Out, it stops. It could be a firmware bug? I tried the HR_10g and HR_11d, both with the same problem.


Thanks.

[jsmcortina]

Extremely unlikely to be a firmware bug.

James

[TheRipper]

I think that maybe a very little voltage variation on Spark Out is switching the TFI module. I´ll search for interference or something like that, but I was thinking of changing the pull-up resistor to a higher value, to ensure there´s no voltage on the Spark Out before cranking. Is this makes sense? Would a 1K or 10K work in this case?




Thanks.

[jsmcortina]

That's unlikely to work. Without a low value resistor you won't over-power the limp home mode built into the module.

James

[TheRipper]

James, that makes sense, but I found that the MS2 manual suggests a 1K pull-up:




In fact, I don´t believe that this mod will solve the problem at all, but I´ll try

Thanks.

[mikecba]

2014-10-02_12.02.56.msq

I have the same problem. Its a bug. Fortunately it doesnt open injectors because it would flood the engine. I´ve tried everything but sparks at 7000rpms if you use tfi settings.

[jsmcortina]

I have the same problem. Its a bug.

What exactly is a bug ?

James

[mikecba]

I have the same problem. Its a bug.

What exactly is a bug ?

James

Hi James. I think its a firmware bug. I have a ford tfi engine with ccd. When yo turn the ignition on, before cranking, Megasquirt starts sparking without the halls sensor signal. If you turn the engine, stops sparking at 7000rpms, starts the fuel pump and sparks at correct rpm, and the engine starts. When the fuel pump relay isnt on, starts sparking at 7000 rpm.
It does it even if you only feed the ecu with 12v without any sensor conected.
Only on tfi settings.
Sorry for my bad english!!!

[slow_hemi6]

Only happening on hi res or does it do the same on 029y4? As I dimly remember hi res was not totally tested in all possible scenarios by it's author.

[jsmcortina]

I'd not heard of this before. Might be best to upgrade to MS2/3. The MS1 code was completed many years ago and no changes or bugfixes are planned.

James

[mikecba]

Only happening on hi res or does it do the same on 029y4? As I dimly remember hi res was not totally tested in all possible scenarios by it's author.

It happens on 029y4. TFI with ccd wasnt totally supported. Maybe i could cut the short tooth of the hall sensor wheel and use generic wheel with missing tooth instead of tfi.

[jsmcortina]

There won't be enough teeth if you do that.

James

[Scottblue5]

Hi folks, sorry to dig up an old thread here but i have the exact same problem and setup on a ford sierra pinto engine with tfi ccd module and wondering if anyone ever found a solution to this?

Many thanks