ignition problem
 

i've got a sachs 3.4 with CH ignition. the problem i'm having is when i start the engine all my servos go crazy. I made about 20 flights before problem started. any suggestions.

RE: ignition problem
 

crashhappy

Sounds like a loose spark plug boot/cap.

Also look for loose metal to metal contact like a loose muffler, loose connector on the ignition/ignition battery/ both the receiver and ignition switches.

It definitely sounds like RF interference so very carefully check everything that has to do with the ignition

RE: ignition problem
 

i checked every thing i could think of. even opened ignition box found a broken wire (repaired it) could the box be the problem. im new to electronic ignition & its an old system

RE: ignition problem
 

I would send the ignition into C&H. You may have another problem in the unit.

RE: ignition problem
 

I agree with Giestware

RE: ignition problem
 

I had this exact same problem several years ago. All was fine for a long time, then all at once there was lots of servo twitch and zero range with the motor running. I chased it till I was nearly blue in the face. Finally found a radio switch that was worn and the vibration from the running engine caused it to have intemittant contact. Replaced the switch and the problems went away. I just plugged the battery direct to the reciever to find the problem.
It could also be an inteference problem as stated above, but check for a loose or worn switch or connector first. Epecially if you have no range with your antenna up.

RE: ignition problem
 

i've done the switch bypass (first thing) i messed with it today a little. not good i think. i hear spark jump in the box. this cant be a good thing. looks like off to CH come tuesday

RE: ignition problem
 

You may want to get a spare sensor. Many times if you lose ground or something, it will damage the sensor.

RE: ignition problem
 

When you're at it, swap the receiver and see if that cures the problem. Been there.

RE: ignition problem
 

put 4 dedifferent receivers. same problem. did not know about the 6 twist per foot. tried that but no good.