S2 Still won't fire on cylinder 4

[Spacecowboyuk]

Hi all, been dipping in and out sorting various recommissioning issues on my 2.9 but 2 elude me - brake master and slave and the lack of spark on cylinder 4.

It seems to be only cylinder 4 that won't fire. The plug is wet so has fuel. I have ground a plug to the block and still no spark (sometimes I get an intermittent spark but thats rare). I have swapped leads and I think it may be a dodgy plug suppression extender but not 100%.

I've swapped the cap for a known good used one - same fault.

Outside of the suppression (where do you get those from and can I run without?), any ideas why else it might not spark on that one cylinder or what other tests I should be doing? Thanks!

[GreenV8S]

You just need to trace back methodically. Is there a spark coming out of the corresponding post on the dizzy cap? The fact you have a good spark on other cylinders rules out LT problems and HT problems on everything out to the rotor arm.

[magpies]

Google 'pistonheads tvr s series brake servo' and/or 'pistonheads tvr s series brake master cylinder' to find what others have used.

[Spacecowboyuk]

Thank both I'm going to go back to basics on this.

On the brake servo and master specifically, I understand that my only real option is to go for a Racetech or Motoclan system. Ford parts are now like the Saab parts - they simply no longer exist. Have I got that right?

[Astacus]

Could you bet your parts refurbed?

[phillpot]

Bin the suppressors.

[Spacecowboyuk]

phillpot said:

Bin the suppressors.

Can I go direct from lead to dissy cap without them? Or do I need to change to a later cap with male connections?

[Spacecowboyuk]

Is it also possible that the dissy isn't quite in the right spot? We removed it to replace the amplifier and I'm wondering if it's slightly off, could this be a symptom?