Thread: Lucas ignition amplifier replacement by Bosch 024

ok replaced the coil, and HT lead, checked all connections, fired up still no spark from the coil lead, would a faulty BIM cause no spark, if so how can it be tested, can it?? or is it one of those things that cant be, would like to test it first before I buy another one, also what else would cause no spark if all these are good, is there a fuse?? of would faulty ECU cause no spark?

ECU has no control over spark on the 14cux system, but as mentioned needs a signal wire from the coil to it. Is that back on? It won't run without it.

yes that is back on white/black wire on - side of coil, fuel pump relay runs periodically when ignition turned on, im lost as to why no spark all of a sudden when I had it was running then nothing, I could understand if there never was a spark but it all of a sudden disappeared,

ok well i have ordered a New Bosch MEC717 and a BIM024, lets see if that fixes the No spark issue, if it does not then i'm not sure were to go from there, what else in the ignition system is responsible for spark from the coil?

lets leave out the distributor for the moment as there is no spark to it yet anyway.

Thanks

You can't "leave out the distributor" as it contains the magnetic pickup. Connect your meter to the two wires that are normally connected to 3 and 7. Read the resistance. THEN you must move the distributor shaft in a way that the teeth of the central rotor pass the pickup. You can do this by hand if you turn the engine to a suitable spot first. OBSERVE the reading on the meter, it should be fluctuating wildly as you generate small pickup voltages. When you stop moving the resistance reading should return to the stable value. Once this input is confirmed you move onto a replacement module.

ok so if the Magnetic pickup is faulty then this would cause no spark from the Coil to the Dizzy is that correct ?

bee utey,

i have been scouring posts on here and came across this response in this thread

Gas/petrol disco cuts out on petrol!??

Originally Posted by bee utey

The distributor contains a magnetic pickup that creates a small voltage every time the teeth of the rotor thingy pass it. That voltage is transferred to the ignition amplifier via the red and blue wires. The amplifier then switches the coil negative side, just like points used to. You can test the pickup with a multimeter on resistance, unplug the pickup from the amp, under 500 ohms and not affected by wriggling any connection.

reading that i presume that if the Magnetic pickup if cactus or otherwise faulty it would not send the signal back to the module and in turn not not switch the - side of the coil, end result would be no spark from the coil to the Dizzy.

have i read this correctly ??

Kevin

Originally Posted by Kevin B

have i read this correctly ??

Kevin

well yes, that's how a simple electronic ignition module works, there's no computers involved.