juka

I posted this on pgmfi, but thought I'd try the ht brains too:

96 integra (B18B1), with stock p75 obd2 ecu.
-----Idle is perfect.

Then I swap in a p75 ECU from a 95 (obd1).
(chipped with stock LS Uberdata basemap, with ELD disabled).

-----Idle starts around 2000, fluctuates down to 1500, keeps doing this about 20 times until it rests at 900 or so.

Back to the stock obd2 ecu.
-----Idle is perfect again.

Obviously it's not a vac leak, or anything else mechanical... I'm thinking it's the ecu, the conversion harness, or the PA sensor on the ecu.

I know Canadian integras have no ELD.
Q) Do Canadian integras have an internal or external PA?
Q) Any other differences between these 2 p75's?

One is a 95 USDM p75. (idle bounce)
The other is a 96 Can p75. (idle fine)

I'm gonna try disabling the PA in another chip and try that.

Any other suggestions?
Thanks

juka

Could this be something that the new ecu LEARNS over time? Is there some adjusting going on?

I tried a basemap last night with PA sensor disabled. But same symptoms.

I don't think disabling it helps here, cuz my old (good) ecu doesn't seem to have an internal PA sensor.

Not sure if it's just during the warm-up period, but I'm hearing a SHHHHHHHHH sound from near the fuel filter/fusebox area.

Anyone? Anyone? Bueller?

juka

speed bump