Hi,
I was driving back from work the other day and my car was running fine. I was giving a a good burst from time to time then started to notice that the power was progressivly decreasing. By the time I got home I could not boost it over 5psi and at the point it runs realy rich...
I know its rich due to the state of the plugs when I pulled them out to do a compression test, which seemed fine as well (all within 10%).
Things I have done to fix it are:
1) re-fitted all intake piping after the Afm and before the throttle body, there were no obvious leaks.
2) replaced the Z32 AFM with a mates and it made no difference.
I was thinking it could be:
1) crank angle sensor?
2) plenum gasket?
3) maybe a pin hole in the cooler, I have checked and cant see anything?
Any suggestions would be great, I am thinking air leak but its very hard to determine where it might be???