Engine lumpy running on tickover

IT's more usually called a crankshaft position sensor,
And yours is down the front where the gearbox and engine meet.
Two wire plug,
Brown - Red and Green- red.

not a question but a word of thanks. for the quick reply. will investigate . would this create a backfire , ? once again , many thanks for your help.

Easier to post this than explain all causes of backfire , might help you .

https://www.2carpros.com/articles/engine-backfires-while-running

Hmm,
Backfires are caused by a number of different things,
The CAS is basically a signal generator.
It makes a signal from the rotating engine with a "blip" in the signal that corresponds to where Cyl#1 is at Top dead centre.
From this signal "blip" the cars computer can decide where to signal the spark plug ignition.
This is basic operation and is actually way more complex than this.
But without access to very expensive test 'scopes you only option is renew the CAS and see if it fixes the fault.

Basically , when crank sensors fail it results in non start .You can try cleaning and checking wiring / connection to sensor .

problem solved... replaced the crank sensor. tickover back to nice and smooth no backfire...... many thanks for the very sound advice. ron.

Glad you got it fixed , thanks for updating the forum .

ok. solved the lumpy tickover problem ,, now we have another ( believe it or not) just had the car plugged in and the coolant temp sensor came up. so, paid our very friendly main dealer to purchase said item........ the problem I have now is where the flippin eck does it fit can't find the damn thing anywhere any help would be very much apreiciated

ron.