Suddenly running lean
2 Attachment(s)
My megasquirt is MS3 Basic from Rev and everything else in my car is stock.
I got my '99 1.8l 10ae running with megasquirt few days ago and I've been autotuning it a bit. First day it suddenly started running lean with like 17-19 afr but problem went off after a few engine restarts. Now it happened again when I was idling at parking lot, afr suddenly went to 17-19 and car stalled and after I restarted engine problem persisted and I couldn't keep car running without giving it gas. Also started to be a strong fuel smell. My log is from starting the car after it stalled when idling. E: Also I noticed burning smell and faint smoke coming out from two gauge holes next to my afr gauge in my center console. Also the car maybe feels like its running on 3 cylinders, im not sure but the car is a bit shakier than usual and the exhaust note is different and feels like car has lost like 70 horsepower. If I go wot the afr is ~14.5, normally it would be 12.5 Could the problem be a bad ground/wiring or something? |
You're likely suffering from injector heat-soak and I guess (just a guess) your injector dead-times are off. Probably too short. Check the forum for injector heat soak and take it from t here.
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Originally Posted by stefanst
(Post 1497202)
You're likely suffering from injector heat-soak and I guess (just a guess) your injector dead-times are off. Probably too short. Check the forum for injector heat soak and take it from t here.
Also today when I started the car the same problem started instantly. I also noticed some kind of burning smell and gray smoke coming from the two gauge holes next to my afr sensor on my center console. |
Originally Posted by stefanst
(Post 1497202)
You're likely suffering from injector heat-soak and I guess (just a guess) your injector dead-times are off. Probably too short. Check the forum for injector heat soak and take it from t here.
Today car ran fine first but ~2h after first drive I started the car again and the problem was back. Here is a log of me driving with this problem on: https://www.dropbox.com/s/4qo1iwvcxx...04.37.msl?dl=0 Also today I noticed burning smell and faint smoke coming out from two gauge holes next to my afr gauge in my center console. Also the car maybe feels like its running on 3 cylinders, im not sure but the car is a bit shakier than usual and the exhaust note is different. Could the problem be a bad ground/wiring or something? |
Originally Posted by topsu
(Post 1497244)
Thanks, I will look into this.
Today car ran fine first but ~2h after first drive I started the car again and the problem was back. Here is a log of me driving with this problem on: https://www.dropbox.com/s/4qo1iwvcxx...04.37.msl?dl=0 Also today I noticed burning smell and faint smoke coming out from two gauge holes next to my afr gauge in my center console. Also the car maybe feels like its running on 3 cylinders, im not sure but the car is a bit shakier than usual and the exhaust note is different. Could the problem be a bad ground/wiring or something? The easiest way to deal with it is to lower target AFRs in the lower kpa cells and enable PID AFR control in idle. |
I think I found my problem.
When my car was running badly I pulled 2nd spark plug wire out and cars behavior did not change, when I put it back it started to run normally again. Had to do it again when after a while car started to run badly again. Could the problem be in my ms3 settings because these problems started same day as I installed my megasquirt. I'm using '99 1.8 NB stock coils. https://cimg9.ibsrv.net/gimg/www.mia...bd18346d98.png https://cimg1.ibsrv.net/gimg/www.mia...a1a05b72e2.png |
Intermittent problems with spark cutting out are not caused by Megasquirt install. Your coils may be on the way out, running only marginally. Were cylinders 2&3 affected, or just #2? They are both running off the same coil.
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Not sure about other times but those two times it was cylinder 2.
I'll start looking for toyota cops from local junk yards. |
Why not fully diagnose the problem before you start buying parts? It's not my money of course.
Also: Why buy Toyota COPs? Miata ignition works just fine and is easier to install. Or are you going for 400+hp? |
Installed aftermarket coilpack and now it's running perfect again.
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All you did was bandaid the issues by throwing more powerful coils at it, did not fix the root cause
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Originally Posted by Dlaitini
(Post 1500485)
All you did was bandaid the issues by throwing more powerful coils at it, did not fix the root cause
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