Hi all, the issue im having is my c20let engine starts and runs fine when cold, every time i take it out and the engine starts to get warm the engine starts to hold back and splutter a bit then stall once stopped, the spark plugs are really sooty black, now it has not logged any fault codes in the ecu, things ive done so far, change the ecu, changed MAF sensor, CTS, ISCV, TPS, check all voltages to the sensors, checked all the earths, nothing, the only things i havent changed are the ignition coil lead/HT leads/ plugs/dizy, would a coil lead start to break down once it gets warm and cause this, weak spark hense sooty plugs? dont know desperately seeking help, when cold, its crazy to drive but not long before the fault appears, but disapears when cold, then re appears when warm again, any help please

 

Try a coil, my mates did similar and that cured it.

 

 

What fuel pressure regulator are you using ?

 

Can't help with your issue.

But that screamer pipe design looks restrictive.

 

Yes will try that, would it cause this sort of fault then.

 

Yes it looks retrictive at the moment new one ordered, but this dont work until 16psi, but the problem is befor that even works,

 

fuel pressure reg is after market adjustable upto 7bar had it set at 4 bar on idle as this is what its supposed to be set at on phase 3 but it seemed to be over fueling so i turned it down to 2.5 bar but as i say it starts to die once it starts to get warm, and cut out but does restart but wont tick over then, it dont back fire it just seem to splutter and hold back, i check the plugs every time and there sooty black again.

 

When it was at 4 bar did it run alright? 2.5 Bar sounds a little low to me.

 

No it did exactly the same, could it be the MAF sensor to close to the turbo, as the turbo is uprated with a 4 inch inlet, could the sensor cope with the amount of air flow, but it dosent show any faults on the ecu fault test

 

Is that on a stock ecu ?

Has it ever run right ?

 

Its a vmax evo 5 ecu, genuine chipset and power wheel, it ran fine when i had the wrong MAF sensor on it, it was AN xe not a c20let one

 

TBH I can't say I am suprised that its running a bit odd, that combination of engine parts really should be run by a standalone ecu.

Have you tried another LET MAF on it ?

 

no not yet but what iv noticed is, that the mesh is missing both sides of the MAF, dont know if that would make any differance though.