RevMS2v3 engine running erratically. Was perfect 2 days ago. AFR/RPMS/MAF all over! - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-10-2013, 10:24 PM   #1
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Default RevMS2v3 engine running erratically. Was perfect 2 days ago. AFR/RPMS/MAF all over!

Sorry for the long title, but was trying to be descriptive. Two days ago my car was running amazingly and it's just been in the garage till today. This afternoon I jumped in it and right as the RPMs started to settle like they always do, the engine stumbled real quick and then just quit like someone shut it off.

I tried starting it a few times while I was checking things over in TS. Sometimes the car will start normally, then, stumble and shut off. And other times I'll start it and the RPMs swing wildly. AFRs are all over the place and it's basically not operable.

I pulled the battery for a couple minutes to see if that would clear the problem and it seemed to, but I took the car for a short drive around the block to check it and after running fine for a few minutes, it cut out. I had to turn if off for a min and restart a few times to barely make it back to my place.

This log is after having the ignition off for a few minutes, start, run, not touch the throttle and let it run it's course. Started a second time and let it run it's course.

After looking over the log, I noticed the MAP looked weird. Moving around a lot and 80kpa engine off, all kinds of crazy. Thoughts anyone please?

TLDR: My MS is going crazy and I need help. Log/Tune included.

MS2v3 reverant built. 2004 MSM regular install. Nothing crazy

Thanks for your help.
Attached Files
File Type: msl 2013-06-10_17.28.20.msl (232.9 KB, 37 views)
File Type: msq 2013-06-10_18.05.25.msq (96.0 KB, 49 views)
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Old 06-11-2013, 10:42 AM   #2
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I don't usually offer up advice since im a noob, but I had a similar issue with the MAP sensor having crazy readings, turns out my MAP sensor wasn't soldered to the board on my MS. If you have 80kpa when the engine is off, it might point to a bad MAP sensor or connection?
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Old 06-11-2013, 02:44 PM   #3
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Agreed. I replaced my 2.5 bar map sensor with a 3 bar sensor from Symtech Labs. I'm pretty sure I did a good job soldering it in there and it's been working great for the last few months. Maybe it came loose or went bad.
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Old 06-12-2013, 10:42 PM   #4
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FIXED!

Removed MAP signal line and there was coolant in there from when the engine popped last month.

Everything was meticulously cleaned except the vacuum lines. Tomorrow I'm going to take a good look at all of them and do some more cleaning.
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Old 06-12-2013, 11:23 PM   #5
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Good job man
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