Idling Rich
#1
Idling Rich
Okay so my car is idling rich with the stock ecu and with the pfc...my car is completely stock with only downpipe, bonez hf cat and catback. The wideband reads 12.5-13.0 at idle with both the ecu. I've changed the spark plugs, wires, oil, fuel filter, air filter, checked for vacuum leaks(none), replaced all vacuum lines, check valves, and all the sensors checked out good with the pfc and yes my air pump is working. It's been 6 months that I've been trying to fix this problem but i can't figure out the problem...any suggestions would be helpful, thanks.
I've searched trust me I've been researching for 6 months...
I've searched trust me I've been researching for 6 months...
#6
Unhealthy Obsession
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If you have the PFC Commander it can be leaned out fairly easy through PIM or INJ settings.
Detailed info ---> https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-make-your-untuned-pfc-basemap-safer-idle-better-no-datalogit-needed-841706/
Detailed info ---> https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-make-your-untuned-pfc-basemap-safer-idle-better-no-datalogit-needed-841706/
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#11
rotorhead
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Air pump and/or ACV are not working properly for whatever reason. Your idle should read very lean if those are working. What happens is that the idle is actually rich inside the engine, but the ACV directs air to the exhaust ports to lean it out before it reaches the cat.
Is your airpump clutch working properly? Switching actuator on the ACV and its associated vacuum routing good?
The air pump should be working. With vacuum applied directly to the switching actuator the idle should be very lean due to dilution at the exhaust ports. The way it works is that the switching valve is spring loaded so that airpump air will naturally flow directly to the cat. When engine vacuum is applied (like at idle) the valve will lift and secondary air will flow to the exhaust ports. When the ECU wants air to flow directly to the cat (split air) it cuts the vacuum to the switching actuator by engaging the switching solenoid.
see this thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-engine-so-damn-complicated-part-2-emissions-controls-841963/
Is your airpump clutch working properly? Switching actuator on the ACV and its associated vacuum routing good?
The air pump should be working. With vacuum applied directly to the switching actuator the idle should be very lean due to dilution at the exhaust ports. The way it works is that the switching valve is spring loaded so that airpump air will naturally flow directly to the cat. When engine vacuum is applied (like at idle) the valve will lift and secondary air will flow to the exhaust ports. When the ECU wants air to flow directly to the cat (split air) it cuts the vacuum to the switching actuator by engaging the switching solenoid.
see this thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-engine-so-damn-complicated-part-2-emissions-controls-841963/
#12
thanks for the info...i'm sure my acv is working fine along with the solenoid valve, but I guess I'll go back and double check them again. Also thanks for the info of the air pump turning off earlier with the pfc moconnor, I'll by-pass the relay and see if it changes anything.
#13
Eats, Sleeps, Dreams Rotary
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thanks for the info...i'm sure my acv is working fine along with the solenoid valve, but I guess I'll go back and double check them again. Also thanks for the info of the air pump turning off earlier with the pfc moconnor, I'll by-pass the relay and see if it changes anything.
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