So, a nice 4 hour/300 mile trip out to Spokane, Washington to meet Aaron and his
Subaru.
This is Aaron
Checked all the pertinent hoses etc for leaks, nothing relavent to be found. Pulled the TB off, it gave me an opportunity to check the groove and to see what else was hiding underneath.
The first red flag that went up was when I was checking the ecu readings... the TP was at 0.0
Question 1.... If the TP is at zero on a cabled TB how is it idling... further checks... found the IAC hiding off to the left of the TB.
It has that 3/4" hose connected to it and the opening inside the manifold is just as large. Solution, had a pre-made plug with a 1/8" hole drilled through it... stuffed that into the hose.
Then put everything back together.
Cold ecu readings...
Load_PCT 5.1
SHRTFT1 -8.6/-12.5
LONGFT1 2.3
MAP 7.4
RPM 950
Engine at 190F
Load_PCT 2.7
SHRTFT1 -.8/-2.3
LONGFT1 -7.8
MAP 7.4
RPM 700
Engine after plugging the IAC inlet @190F
Load_PCT 2.7
SHRTFT1 -8.6/-12.3
LONGFT1 0.0
RPM 675
@2000rpm
Load_PCT 5.9
SHRTFT1 4.7/5.5
LONGFT1 1.6
MAP 6.2
The engine has 155,747 miles on it, sounded a little clunky when he moved it cold.
Took it out for a spin after the IAC fix and even at that mileage its got some spunk.
Aaron will reset the ecu tonight and start monitoring his mileage tomorrow.
I expect the trims to change a bit but with the drastic change that occured just by minimizing the IAC airway it should be good.
Grooving right along...
Karl Fortner
Tacoma, Washington