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Power FC Idles rich, leans out and dies pushing throttle.

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Old 09-03-15, 03:11 PM
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Idles rich, leans out and dies pushing throttle.

1987 rx7 tii. Power fc, obviously. 750/750. I can get the car to idle, be it rich as hell... but as soon as I touch the gas it leans out and dies.... any ideas? Tps is good, grounds are good, injectors are new. Just don't understand how it will idle so damn rich but then lean right out with barely any throttle...
Old 09-04-15, 05:05 PM
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Depends completely on the map and if parameters are set correctly. Fuel correction... injector settings... several things. I don't know if you have one but it would be extremely helpful to have the dataloggit and have everything hooked up to map. This questions as I've found out is not a simple answer. I too have an 87 t2... I'm tuning on it more this evening.
Old 09-04-15, 07:57 PM
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I have a datalogit I've got a log saved of idle and throttle push. Would an upload of that help?
Old 09-04-15, 08:09 PM
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Originally Posted by barkz
I have a datalogit I've got a log saved of idle and throttle push. Would an upload of that help?
You sure both rotors are running, ie spark and fuel?
Old 09-04-15, 08:13 PM
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I'll double check, but all seems well, I've heard a rotary only run on one, and mine does not sound like that.
Old 09-07-15, 03:44 PM
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It's acting as though the AFM is bad, but being a PFC it runs off a MAP... anyone have a test procedure for the map? Gm 3bar? I think, whatever comes with the banzai kit.
Old 09-07-15, 04:33 PM
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Originally Posted by barkz
It's acting as though the AFM is bad, but being a PFC it runs off a MAP... anyone have a test procedure for the map? Gm 3bar? I think, whatever comes with the banzai kit.
look at the sensor screen and make sure the MAP sensor actually works? feel free to apply vacuum and pressure to the sensor with the key on engine off, and watch it work
Old 09-07-15, 05:14 PM
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I'll give that a shot. Will report back ASAP.
Old 09-08-15, 05:37 AM
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What base map are you using?

Post up pics of the commander sensor/switch screen and the monitor screen.

Last edited by Banzai-Racing; 09-08-15 at 06:13 AM.
Old 09-08-15, 10:24 AM
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Will do when I get home.
Old 09-12-15, 06:00 AM
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i also get this, im running a fd3s single. when its cold it wont idle its self, i have to put throttle input to keep it running, i carnt hold it at light throttle as it will lean out and die. once its up to 55c water temp then it will idle fine but still have the stumbling at part throttle. any more throttle and it is fine.
Old 09-12-15, 06:58 AM
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Originally Posted by karl_tate
i also get this, im running a fd3s single. when its cold it wont idle its self, i have to put throttle input to keep it running, i carnt hold it at light throttle as it will lean out and die. once its up to 55c water temp then it will idle fine but still have the stumbling at part throttle. any more throttle and it is fine.
Mine starts up fine, idles fine, warms up fine, anytime I touch the throttle it dies. Still gotta get that info posted. Been busy.
Old 03-07-16, 03:42 PM
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ok, bumping this. I think its just the fact that its running the stock PFC map why im having my issues. Does anyone have a "base" s4 map or something s4ish that i can download and try to have a starting point?
Old 03-07-16, 03:47 PM
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You could download the Haltech software, load one of the s4 basemaps, and copy it. You sure its running on both rotors?
Old 03-07-16, 04:08 PM
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yes both rotors. getting frustrated that i checked and rechecked everything, got it to idle fine, albeit rich as hell but just a tap of throttle, dead... had to inch it forward and was able to just turn up the idle screw and let the clutch out and roll it.
Old 03-07-16, 04:12 PM
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Originally Posted by barkz
yes both rotors. getting frustrated that i checked and rechecked everything, got it to idle fine, albeit rich as hell but just a tap of throttle, dead... had to inch it forward and was able to just turn up the idle screw and let the clutch out and roll it.
Cant you just mess with the fuel map and lean it out a bit, see if ur afrs change?
Old 03-07-16, 04:19 PM
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I have gotten afrs to go down by tinkering. Im in no way comfortable really messing with it. I just bit the bullet and emailed Banzai for a new map. Gonna go from there. Im trying to sell the car without putting too much more money into it.
Old 03-10-16, 09:18 PM
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Sounds like you have the factory map sensor setting selected on your tune though you are using the GM 3 bar. This would make it's scale reference way off.
Old 03-11-16, 08:12 AM
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Originally Posted by furious_rotation
Sounds like you have the factory map sensor setting selected on your tune though you are using the GM 3 bar. This would make it's scale reference way off.
Possibly. But I've got the custom map from Banzai loaded just need a new battery and to cross my fingers lol
Old 03-12-16, 01:03 PM
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New battery today. Nice backfire to start, then it fired right up and purrs like a kitten! Revs no issue now!
Old 03-13-16, 06:45 PM
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And today I drove it!
Old 03-14-16, 08:43 AM
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Sweet. Glad you got it fixed.
Old 03-14-16, 10:32 AM
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Me too. Still needs some driving time. Been sitting a while it's a little stiff lol.
Old 03-16-16, 04:03 PM
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Soooo runs great, free revs fine, drives great, at low throttle/rpm. But while trying to give it some omph she stumbles hard, pfc controller telling me, no boost, only vacuum. So should I trouble shoot as an fc, or maybe something related to pfc?
Old 03-16-16, 04:51 PM
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sounds like a possible boost leak. Make a boost leak checker.


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