my car idles in the p9's, im running manual idle control, i did have a major vacuum leak that was preventing me to get decent afr's without idling around 1300 rpms which i thought was adding load but now that is sorted out and i can drop the idle pretty low and get good afr's but the idle is still at p9 with the stock PFC scaling.

This seems alot higher then what i normally see. I have a fairly large street port, and the throttle body elbow is off right now, the engine also hasnt been broken in. What does everyone else idle at? None of these things seem like they would cause my engine load to be so high?? Also this is with no accessory loads added.

 

P3 - P6 depending on porting and idle loading.

 

i cannot understand why mine is idling in such a high P range.. I checked my compression and its 115- 120 on both rotors with even pulses, which is what i expected with a fresh engine. My vacuum is around 16 inhg. i thought it was 8 but my greddy e-01 actually shows it in PSI so i did the conversion 8psi x 2.036 to get my vacuum reading to something familiar.

I do have a large street port but that shouldnt change it THIS much. Anyone know what could be causing this? I feel like half my map isnt even usable because the idle is in such a high area if the map. The car is running fine though.

 

Where is the MAP sensor hooked up? Have you verified no vacuum leaks with a pressure tester? I have a big streetport and I idle in the P4-P5 range, about 14-15" of vac.

 

I don't have any leaks as far as i can tell. I fixed the ones at the injectors. I did do a pressure test and also sprayed carb cleaner all around and the engine doesn't bog. The only thing that is sucking in more air is the atomization injector line. It is a very strange thing. if my map sensor isn't reading correctly could that cause this? The map sensor is the connected to one of the nipples coming off the firewall side of the throttle body. The p range is based off the voltage of the map sensor correct? I'll check the voltage again today with the car at idle. I know it was correct with just key on. wouldn't the car run like **** if it was reading more air then it should?

 

Which map sensor are you using with stock scaling?

 

The stock map sensor

 

i think i found my problem. my map sensor voltage at idle is 2.48. which is atmospheric pressure not vacuum. if i remember correctly this voltage is supposed to be like 1.3 or so. i could feel suction at the map sensor line so it is either the wiring or my map sensor. im going to check the FSM on how to test the map sensor with the mityvac. But i might be in need of a map sensor.

 

ok i checked my map sensor with a mityvac and voltimeter the map sensor voltages check out okay at the map sensor, but not on the commander, so it must be one of the wires.

I'm happy cause now i have found a problem that i can actually tackle rather then just play guessing games.

Do all 3 of those wires go to the ECU? does anyone have a pinout that shows where these wires are? If nothing else i will just run 3 new wires and splice them in so i know they are good.

 

i can only find one wire that goes to the ecu so far. Do the other 2 come from somewhere else? im thinking one is +voltage one is ground and the other is a signal wire. does this sound correct? Im having trouble finding a wire schematic from the MAP sensor.. plus if i did find it im not the best at reading them either. can someone give me some insight?

 

i'm moving this issue to the 3rd gen section with a new thread because it doesnt seem to be a power fc issue. here is the new thread. https://www.rx7club.com/showthread.p...15#post8162815

 

Page F-240 of the FSM shows:
(1) green/yellow goes to pin 1O (not 10) of the ECU, the output voltage.
(2) brown/white goes to pin 3I of the ECU and also connects to the TPS and MOP.
The voltage source.
(3) black/light green goes to ground.

Very simple diagram to read.

 

Thanks chuck. I got the wiring figured out and fixed yesterday. It was something between my emanage and pfc. I found that the greddy unit showed the correct voltage so i knew the problem was somewhere close.

 

You're running both? What's the advantage?

 

Not really much of an advantage except i can view everything on my e-o1 i already had the emanage so i decided to keep it. I don't really use it for adjustments though more just for monitoring and as guages. Its pretty nice that way and i can create warnings and view my wide band and stuff on the screen.