My Scooby seems to have a problem that we cannot get to the bottom of.

Some time ago it started to miss at higher revs and was told it was probably the coil packs or the plugs. Well i got the coil packs changed a few months ago and yesterday finally changed the plugs for a nice new shiny set of Greddy plugs. However the missing is still there!!! From about 5.5K upwards is where it seems to happen, but in the cold it seems to run much better, only missing slightly if at all.

Any idea what this could be?

Thanks

 

is it def missing not pinking? is the car running standard boost?

 

Pinking is when you hear a metalioc noise from the engine where the fuel is being ignited as the combustion temp is too high, normally very difficult to here as its so high, i thought you couldn't normally feel pinking? This feels like good old fashioned missing / spluttering?

We have put the apexi kit back on now and it "seems" to have cured it, but its only been one run so time will tell.

 

i felt and heard it when i put diesel in my old sierra lol!
ok was only trying to help...i'll get my coat

 

LOL

 

look at the dump valve.I'm having a similar problem and it seems that the dump valve is letting of pressure.Its not a bailey is it???