speeduino starts but won't idle
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hi, I have a stock 91 miata with a speeduino PNP i got it to start up but wont' idle, I have to hold the throttle to keep it running and once I let go it just dies. I left the stock afm installed and pluged in. I'm going to link a copy of my tune and a data log. can anyone help me understand whats wrong?
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Variable TPS installed? Wideband?
Read this too: https://www.miataturbo.net/ecus-tuni...2/#post1484735 |
Originally Posted by huesmann
(Post 1487072)
Variable TPS installed? Wideband?
Read this too: https://www.miataturbo.net/ecus-tuni...2/#post1484735 |
As a starting point, try turning off the idle control. In your log I can see the idle value being around 28%, which will fully close the valve (These valves aren't linear in operation). With it turned off, the valve will default to about 25% open, which generally gives a stable idle, though a little higher than normal.
Was that log taken when the car was warm? P.S. You also have your idle direction set to reverse, which is going to cause all sorts of confusion when you try to tune the idle control. |
Originally Posted by noisymime
(Post 1487225)
As a starting point, try turning off the idle control. In your log I can see the idle value being around 28%, which will fully close the valve (These valves aren't linear in operation). With it turned off, the valve will default to about 25% open, which generally gives a stable idle, though a little higher than normal.
Was that log taken when the car was warm? P.S. You also have your idle direction set to reverse, which is going to cause all sorts of confusion when you try to tune the idle control. |
You need a wideband NOW.
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You can't make it run properly without a wideband.
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Originally Posted by yukiviolet
(Post 1487110)
it was to my understanding that you didn't need a wideband or variable tps to get a car running on speeduino
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I understand that I need a wideband to get the car running properly, but would a lack of a wideband really be reason for the car to not idle? the seller for my kit seemed pretty confident that the car will run and drive without a wideband installed. I'm gonna stop messing with it for now until I can get a wideband into the car.
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anyone who advises another to run a standalone without a wideband, should no longer be considered trustworthy.
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Originally Posted by yukiviolet
(Post 1487280)
I understand that I need a wideband to get the car running properly, but would a lack of a wideband really be reason for the car to not idle? the seller for my kit seemed pretty confident that the car will run and drive without a wideband installed. I'm gonna stop messing with it for now until I can get a wideband into the car.
But it's going to be a looonnngggggg, shitty, and dangerous road to get to that point. Or you can spend $150 on a wideband and get there quickly and safely. :) |
Originally Posted by yukiviolet
(Post 1487280)
would a lack of a wideband really be reason for the car to not idle?
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take out 20% from the whole VE table and try again.
then don't drive anywhere, get a WB and get it tuned :P |
Originally Posted by yukiviolet
(Post 1487251)
I tried turning off idle control and it still dies immediately, although in comparison restarting it is almost instant now. I will try to data log it tomorrow when I have a little more time.
With the last one you posted, was that in a warm engine? The log indicated it was cold, but the warmup enrichment was off and the pulse width was far too low for a cold start (assuming stock injectors etc). Leave the idle control off for now and then start. Is the car otherwise stock? If so, did you start with the PNP base tune? There's a LOT thatst a little bit off in your tune is all. |
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Originally Posted by noisymime
(Post 1487665)
Did you get any further on the logging?
With the last one you posted, was that in a warm engine? The log indicated it was cold, but the warmup enrichment was off and the pulse width was far too low for a cold start (assuming stock injectors etc). Leave the idle control off for now and then start. Is the car otherwise stock? If so, did you start with the PNP base tune? There's a LOT thatst a little bit off in your tune is all. |
Originally Posted by yukiviolet
(Post 1489518)
But looks like its leaning out at idle.
If you're seeing lean on a wideband gauge, the I'd say your calibration is out as the log is reporting it as being very rich at idle. I'm guessing you don't have VTPS on yet? |
Originally Posted by noisymime
(Post 1489536)
That's not what I'm seeing in your log at all. According to that it's going VERY rich at idle as far as I can see. Which wideband are you using and have you calibrated it in TS?
If you're seeing lean on a wideband gauge, the I'd say your calibration is out as the log is reporting it as being very rich at idle. I'm guessing you don't have VTPS on yet? |
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ok update I now have my wideband sending the proper signal to my ecu. been trying to get it to idle but car runs lean, and stalls out the second I take my foot off the pedal. this is what my tune looks like and my latest datalog. I have tried turning idle control off, and nothing as well. if possible it would be nice to see another 1.6 tune as something to compare too.
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The log and tune both look reasonably OK. Your idle is a little lean, but nothing too crazy and definitely should idle by itself at that. Your AFR reported in TS now matches your gauge I'm guessing?
Definitely leave the idle control off for now until you find the stalling problem. It looks like it's on in your latest tune/log. In terms of the hardware setup, I'm guessing you still don't have a VTPS (As there's no TPS movement showing in the log)? If so and you've still got the original switching TPS on, have you disconnected the plug for this (and preferably wired it with a resistor per the manual)? Obviously a VTPS is the better way to go, but you can still run with the original, however it must be disconnected. |
Originally Posted by noisymime
(Post 1489766)
The log and tune both look reasonably OK. Your idle is a little lean, but nothing too crazy and definitely should idle by itself at that. Your AFR reported in TS now matches your gauge I'm guessing?
Definitely leave the idle control off for now until you find the stalling problem. It looks like it's on in your latest tune/log. In terms of the hardware setup, I'm guessing you still don't have a VTPS (As there's no TPS movement showing in the log)? If so and you've still got the original switching TPS on, have you disconnected the plug for this (and preferably wired it with a resistor per the manual)? Obviously a VTPS is the better way to go, but you can still run with the original, however it must be disconnected. |
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