what would cause a 2wd saph to misfire when hot, only does it on full boost

is this something to do with the water temp sensor or am i wrong?

 

I'd like to know this aswell Dan, mines developed one latley

Mind you mines off to Karl to be setup soon, the cold start is shite on mine aswell..

 

try the phase sensor and also crank pulley sensor usually wires corrode and go brittle

 

also forgot to say check the plug gapping

 

Std fit coils are crap at the best of times, so get a group a, the difference is enormous.
As said the phase sensor wiring goes brittle and flakes away, later ones with 1 red 1 blue wire much better as got decent insulation.
Nothing to do with CTS.
Could be leads also, Magnecor are very good on these.
tabetha

 

cheers guys

 

Plugs breaking down when hot or ign amp

What spec Dan????

Paul

 

ignition amp???? Everybody I ask for advise or just talks to says ign.amps DONT fail sometimes.. they break down completly if they do.

Or can you make me a little more clever on this subject ??

 

Any electronic component is capable of being dodgy just at times, eg if it has a dry joint, that will do it.
Any boost induced misfire is very likely to be lack of sparks due to bad coil as this is the hardest time to generate spark due to the cylinder pressure, the higher it is the harder it is to spark for the plug the more voltage it needs.
tabetha

 

Thanks... I dont want to hijack this thread.
But mine does missfire with the gear in neutral and accelerating withOUT boost and ofcause with boost. same revs ! EVERTHING is new and adjusted.. besides the ign amp.. thats why I find it interesting. And I have had exactly that thought about the ign amp cause of my experience from work.

 

Jan< check u have correct voltage at the ignition amp and coil,may just be a wiring fault as these looms are getting old now

Could be something as simple as the amp getting hot and not disipating the heat well??? Has it ever been removed off the alloy heat sink????

If so theres prob no conductive paste on it???

Just a thought

Paul

 

Same problem with mine, I replaced the Spark Plugs,Distributor Cap, rotor arm, HT lead and the coil.

It turned out to be the coil, I bought a Group A coil from Motorsport Developements, best £40 I have spent. Enormous difference, only wish I had done it sooner.

Hope this helps.