Stock ECU Mileage Switch
05-23-06, 02:32 PM
#1
Stock ECU Mileage Switch
Anyone know what the mileage switch in the ECU does?
It changes over at 20,000 miles according to page Z-36 of the 1993 FSM wiring diagram. What changes at 20,000 miles? I'm guessing it doesn't reset when you reset the ECU?
Just curious if anyone else noticed this...
It changes over at 20,000 miles according to page Z-36 of the 1993 FSM wiring diagram. What changes at 20,000 miles? I'm guessing it doesn't reset when you reset the ECU?
Just curious if anyone else noticed this...
05-23-06, 03:06 PM
#2
It is also mentioned on page F-189, but with no explanation of what it does.
*edit*
Google wins again!
From TurboRX7.com:
"What does the "mileage switch" do?
The "mileage switch" is in effect for the first 20k miles on a new RX-7.
It has the same effect as the "power steering switch". It adds some RPM
to the base idle to help keep the engine from dying."
Makes sense since it shares the same pin out of the ECU with the power steering switch. Duh.
*edit*
Google wins again!
From TurboRX7.com:
"What does the "mileage switch" do?
The "mileage switch" is in effect for the first 20k miles on a new RX-7.
It has the same effect as the "power steering switch". It adds some RPM
to the base idle to help keep the engine from dying."
Makes sense since it shares the same pin out of the ECU with the power steering switch. Duh.
Last edited by afterburn27; 05-23-06 at 03:13 PM.
05-23-06, 04:50 PM
#4
RX-7 Bad Ass
iTrader: (55)
On the FC, I know it slightly changed how the emissions system worked.
Dale
Dale
09-04-11, 11:24 PM
#5
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Does anyone know how much RPM is added to the base 850RPM?
It is also mentioned on page F-189, but with no explanation of what it does.
*edit*
Google wins again!
From TurboRX7.com:
"What does the "mileage switch" do?
The "mileage switch" is in effect for the first 20k miles on a new RX-7.
It has the same effect as the "power steering switch". It adds some RPM
to the base idle to help keep the engine from dying."
Makes sense since it shares the same pin out of the ECU with the power steering switch. Duh.
*edit*
Google wins again!
From TurboRX7.com:
"What does the "mileage switch" do?
The "mileage switch" is in effect for the first 20k miles on a new RX-7.
It has the same effect as the "power steering switch". It adds some RPM
to the base idle to help keep the engine from dying."
Makes sense since it shares the same pin out of the ECU with the power steering switch. Duh.
09-05-11, 09:47 AM
#6
RX-7 Bad Ass
iTrader: (55)
Wow, old thread!
I wouldn't concern yourself with it. Idle should be 850 rpm regardless. The mileage switch doesn't seem to really do anything interesting, there are other things to worry about than that.
Dale
I wouldn't concern yourself with it. Idle should be 850 rpm regardless. The mileage switch doesn't seem to really do anything interesting, there are other things to worry about than that
.Dale
09-05-11, 10:27 AM
#7
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Location: Michigan
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The reason I ask is that I just got the engine rebuilt and tranny swapped to a manual and now there are issues running the car at 850rpm. Sometimes the engine stalls due to a/c or fan hits, but not all the time. Runs fine if idle is set at 1100rpm. Any ideas? It idled fine before the rebuild and swap.
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09-05-11, 10:55 AM
#8
RX-7 Bad Ass
iTrader: (55)
It's definitely not going to be anything with the mileage switch. Start by pulling and cleaning the idle speed control valve, make sure it's not sticking. You might have to do some fine tuning on the throttle body, especially the idle adjust screw.
I'd probably post your relevant mods and problems in a different thread. Your problem has nothing to do with the mileage switch.
Dale
I'd probably post your relevant mods and problems in a different thread. Your problem has nothing to do with the mileage switch.
Dale
