last weekend i flew my new tam f-16 with the t-500 and man what fun till the thing immitated a combine harvesrter. nothing appears to be damaged it spools up ok to around 4800 rpm then nothing happens it spools down with no second spool up the gas pulses when started but no ignition but the box says all is good.
the only thing it shows for a fault is low rpm sensor but the sensor is reading fine
the manual says somthing about ignition low rpm but it only says it about fuel ramping after the start cycle has began
anyone have any ideas outher than sending it back to miami just got it back a couple of weeks ago for new injectors

thanks brian

did you check your plug?

"combine harvester" - Do you mean the turbine ingested something, dirt, grass, etc.???

yep plug is good even tried another just in case

im sure it got dirt but had a fod screen so nothing big got in it i have cleaned out the engine and there is no binding it spins over smoothly and the only sound is the normal sound of the bearings and wind moving thru it

Brian,
It must pass an rpm check before initiating the start sequence. It first engages the starter, then looks for an rpm reading of 5000 or more. If you are only getting up to 4800 you aren't passing the test and it won't continue with the start sequence.

If you push the "AIR" button on your start box what is the max rpm you can get? Does it make any unusual noise when the starter is engaged? If it is making a strange noise the starter o-ring could be slipping or you have some oil or dirt on the o-ring. If that is the case inspect the o-ring to see if it is ditry or needs replacing. Clean the o-ring with alcohol. If it is a bit worn you could flip it over and reinstall it. Put a drop of CA in the o-ring grove to keep it from slipping.

Let me know how you make out.

Joe

For whats it worth,if you are starting with the ground unit attached to the ECU,try start sequence without the ground unit hooked up.If it spools up and goes to the ramp sequence you have a faulty ground unit harness lead.Also check your routing of the RPM sensor wire away from any other wires.I have also seen this happen when radio transmitter antenna was to close to rpm sensor wire when starting.Good luck.

Most likely you have an RPM sensor issue. I take it you have the magnetic sensor. Run a magnet around the intake where the sensor is, and off you go. Sounds stupid, but works all the time with those engines, that was the EXACT same symptoms I had with my 500, and that fixes it. Find a magnet, try it, get back to us.

thank you all for some insight
my friend tim davis told me about the magnet trick but he didnt know if it was true
well guess what it is
i cant believe it but it worked
i tried the usual start up and nothing pulled it apart and ran the magnet around and started just as it should
thanks again guys

You are welcome!

It's a matter of the pickup getting magnetized the wrong way, or something. How it happened? No idea. Your transmitter, a charger lead, who knows? Happens sometimes if the engine is shipped and gets x-rayed.

Only works on RAMs and other engines with magnetic RPM sensors...

Mine did this a couple of times and i put the glow plug power from 65 to 60 making it a little hotter.. Also IF it was cold outside meaning BELOW 45 degrees you may need to put your propane setting to 35 or 40 to make the thicker cold powermax to flow.. Russ

Russ,
I could never get mine to light off at a glow plug setting of 65. It will vary somewhat depending on the plug you are using, how far the coil is pulled out, and what your ECU battery voltage is. For a McCoy MC9 60 works most of the time, but for reliable starts I use 55.

A good rule of thumb for the propane gas setting is to set it at 10 less than the ambient temperature (in degrees F).

Joe

this one wouldnt even cycle the plug it would spin up to 4800 then nothing no glow no fuel i mean nothing at all but its running fine now guess i need to add a magnet to my flight box

I have my glow plug "mcCoy" at 60, my propane at 45 and my fuel ramp at 90.. I get consistant starts this way.. Temp outside has ranged from 40 with "warmed in the truck" powermax and up... Russ