Cold start tuning
#1
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Location: Michigan
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Cold start tuning
Hi, I'm struggling to dial in my cold start, it's very cold here in MI today (5deg F) and i'm struggling to get my Miata started. I managed to get it to run after lots of messing around, but with clouds of unburnt fuel and AFR's around 8 ! once they get above 9 the car just stalls. Not sure if I have a funky O2 sensor or what might be happening, any help much appreciated. I've been plating with WUE and ASE, I know the curves are not smoothed yet above 40deg CLT.
So this is the longest I was able to get her to run, she cut out at the end. I did not turn the car off, seems to correspond to a significant and sudden jump in the AFR
MS3x
gt2554r Garrett
1.8
Thanks ! very much
So this is the longest I was able to get her to run, she cut out at the end. I did not turn the car off, seems to correspond to a significant and sudden jump in the AFR
MS3x
gt2554r Garrett
1.8
Thanks ! very much
Last edited by TheV's; 01-06-2018 at 07:43 PM.
#4
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OK, So I made a little progress, discovered my Fuel Pressure regulator vacuum hose was kinked. As the temps in Detroit came up to above freezing I was able to get the car started and running well. Now the temps are back around 20f and it will not start again. I just checked for spark - still can't get output test mode to work.... and I don't see any, making me think perhaps something related to temp is affecting spark output....any ideas ?
#5
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Update - I decided to experiment a little with the suspicion that something inside the MS3X box or cabin is cold and not working. I have a small space heater which i carefully put inside the car and let run for 20 mins or so. After the inside of the cabin was warmed up, I tried to start the car again and to my amazement I got a nice strong spark and was able to start the car pretty easily. Next step will be to diagnose why the car needs to be warmed up inside to be able to make it run.........
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