I have a P70 with Kerostart that just came back from JetCat.
It went to jet cat for a software "upgrade" and to check out an intermittent RPM sensor.
I sent in the ECU the P70 the kero start plug (latest version) and the Fuel pump.
$500+ later I got it all back.
Now it is a major flame thrower.
Every start throws flames 4-6 FEET back. (good thing we are very wet around here so there is no fire hazard)

After much testing and checking I have determined that the fuel valve is being commanded open at all times that the ecu has power.
So the fuel is flowing into the turbine jets even before the kerostart can light.
I tried a new spare valve and that did not help.
I have turned the UACCEL1 all the way down to .100 (as low as it goes).
I have been able to get better starts (12-18 inches of flames) by unplugging the fuel valve, and not plugging it back in till the GSU calls for main fuel.
Once started the turbine runs normally.

Are there some other settings that I can adjust to help this or is the ECU toast?
I will be calling JetCat first thing Monday when they open.
A local fun fly was counting on my jet for the noon demo this weekend so I need to get this figured out quick.

I think you'll find that a P-70 throwing out big flames will be a big hit at your show! Don't try to fix it!
(just kidding of course)

HA! Your right. It probably would be a big hit.
But my Monocoat is not happy about it at all.[X(]

Flyinfoll,
The problem I see with your fix is that now your acceleration from idle is severely retarted and may cause slow transiton that can hurt on aborted landings or sometimes slow accel shutdowns on startup. If you cannot get the main fuel valve to be closed during intial startup( I don't see why that is not possible) but consider puting a shutoff valve in the main fuel line between the selenoid and turbine and keep it closed until main fuel ramp begins. This way you can put your stting for accel1 back to normal

My setting for accel1 is back to .175 to get reliable ignition.
I did get several Slow accel failed starts when my timing was not just right plugging the valve back in.
It would spool to about 20K and then abort.
Spool-up seemed to take forever, but I did not time it.
Late aborted landings were never an option with the P70 and it's 7 second spool-up from idle.
Fortunately we have a very long field and I have a very slow jet so you would have to mess up real bad to need an abort.

I spoke to Bob and he gave me a few things to try/check as soon as I get home tonight.
If that does not work I will next day the ECU back in to JC and I have a spare lined up to borrow for this weekend if mine does not make it back in time.

Got it.
It was some bad solder in the ECU.
Fixed it up and got 3 normal starts in a row.
WooHoo Now I can go burn kero instead of Monocoat.

LOL glad to hear it, I talked to Bob early early this morning, I wanted to make sure he had his coffee before you called!

Have fun with your demo!

Regards,