Hey all,
It's been a while since I've posted here due to illnesses and death in my family which have taken up most of my time.
I would like to ask some of you long-time experienced members for any help or assistance in solving this mystery.
To cut a long story short, I'm having ongoing idle bounce and flat spot or hesitation issues for a while now and can't seem to find what's causing these problems.
The car gets driven once or twice a week and barely does 10,000 kms a year. I put in Subaru injector cleaner once every 6 months and gets serviced 3 times a year.
It's a running a Raptor Supercharger (7psi boost) on a stock 2.5, and Omni 3 bar MAP sensor.
These problems are intermittent and would happen when the engine is cold or hot when accelerating from a stop.
On some hot or cold days the car would be perfect but on other days it would be a pain to drive.
I'm running 95 from my local BP and have been for the last 2 years since I've had the car.
What I have replaced in the past 12 months of the top of my head, there may be something that I've missed though...
1. New DW 65C fuel pump and in-tank filter.
2. New (3rd set) spark plugs.
3. New (2nd set) Pink Sti injectors.
4. New (3rd one) 02 oxygen sensor.
5. New Apexi air filter.
6. New BOV.
7. New (3rd one) MAF.
8. New SC belt.
9. New water reservoir.
10. New fuel pressure damper
11. Replaced ignition coil
12. Replaced throttle body
I'm out of ideas so any constructive advice is greatly appreciated!
Updates:
I've cleaned the throttle body several months ago but it made no difference.
I was told by my tuner that it is fuel related.
I have had it checked for vacuum leaks, no problem there.
I've installed another tested set of injectors (same flow rate) to check if they were the cause of the idle bounce, no change.