On Boost Misfire - AGU K04 - with logs -solved

[tmparry01]

 I'm getting a misfire when boosting to +10psi; At higher (+5k) rpms it seems to mostly clear. Its also chucking out black smoke.

Its ran great for 15k mile after being mapped as below...



Ive tried changing plugs, coilpacks, ign amp, MAF, lambda, N75, wastegate feed clamp and also checked for boost leaks.

What else could it be? I've done some logs below, I dont know if anything can be seen from these....




 

 

[Chris.]

N75 duty cycle is maxxed out.  Is it a boost drop/cut or engine misfire?

[RTechUK]

Could be a lean misfire, fuel pump, crap in the injectors, fuel pressure not scaling ect..

Get it booked in and I will give it a wideband logging session to see what going one, in theory it should take us an hour or two to pin point using external logging on the lambda and fuel pump.

What spec are you running again? 

Nick

[tmparry01]

Thanks for the replies guys. Turned out to be one of the pencils that connects the coil packs to the spark plugs. Took an age to solve and only found when I saw I had a spare one in the garage. The old one had a sooty appearance on the outside....

[RTechUK]

The rubber on the pencil?

Nick

[tmparry01]

Yes, not sure if the plug not being torqued down property or what caused the carbon looking build up...