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Richie-Van-GTi

Overly sensitive ignition amp?

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Richie-Van-GTi

Is this possible?

 

Rewired my car from running a vw wasted spark coil with built in amplifiers to run a dual channel ign amp and peugeot wasted spark coil.

It only ran on 2&3, 1&4 had no spark. Swapped wiring around to switch channels, the fault stayed on 1&4. Swapped coil wiring around and leads around, sure enough stayed in 1&4. Tried another brand new coil, no different.

Probed the trigger wires from the ECU and while both behave the same in terms of pulsing, the magnitude of the pulse is around 30% greater on the 2&3 trigger than the 1&4 trigger.

I am guessing the amp is therefore producing a much weaker signal for the 1&4 and is possibly not enough to fire the coil?

I have tried new wires and terminals etc to rule out a resistance issue.

Edited by Richie-Van-GTi

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SRDT

The signal could be too weak for the amp to register it so it simply doesnt fire the coil.

If the DWELL is set by the ECU and not by the built in amp maybe the weak signal is interpreted as a really short charge time and the coil can't fire.

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PhilNW

Try a spare spark plug on one of the 1 or 4 leads and earth it, see if you get any spark at all (weak or otherwise)

or an ignition tester tool to give an indication of any voltage on the lead  

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Richie-Van-GTi

Tested for spark with a new plug.

I've upped the dwell from 2.8 to 3.5. no different.

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SRDT

You have a weak trigger signal from the ECU, that need to be fixed first.

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PhilNW

Is this your thread for the old system or the new one?

 

 

 

 

 

Edited by PhilNW

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