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Old 03-15-2010, 07:00 PM   #1
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Default WTF, was running good

okay so yesterday i ran my car in autotune etc got it running good, afr's were good yay. go out today start it up and its running like a bag, rich as hell. plug in my computer, reload tune from yesterday and the idle smoothes out but its still rich (12.0 afr's) at idle. Kinda confused me why it would do that, so i get in the car go to drive it out of the garage, once i touch the gas it goes way lean and stalls out. So i loaded the stock tune and its does the same thing. Now when i went to start it before i reloaded my tune it made a huge pop sound when i turned the key to on, like the cylinders were full of fuel. could it have damaged plugs? injectors?
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Old 03-15-2010, 07:04 PM   #2
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reload firmware, reload MSQ.
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Old 03-15-2010, 07:22 PM   #3
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Hey Sav, is pig rich running an indication that the firmware needs to be reloaded? I'm in the same boat as the OP. It was ok one day, then idling at 8:1 the next.

C
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Old 03-15-2010, 07:31 PM   #4
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White--
Send a datalog and your msq to [email protected] and I'll have a look

Chris--
That sounds more like a wideband calibration error to me. Car wouldn't idle at 8:1. Try going through a complete sensor calibration cycle and see what happens.
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Old 03-15-2010, 07:33 PM   #5
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Quote:
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Chris--
That sounds more like a wideband calibration error to me. Car wouldn't idle at 8:1. Try going through a complete sensor calibration cycle and see what happens.
I'll try, but if that fixes it, I'll be pissed, because I just calibrated it a few days ago.

Thanks,
Chris
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Old 03-15-2010, 07:43 PM   #6
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I've seen this happen with a bad ground before--what happens is the sensor will calibrate while driving and throw everything off.
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Old 03-15-2010, 07:45 PM   #7
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Ok, I'll do another recalibration. How do you feel about doing it without removing the sensor from the downpipe if I use a shop vac to suck the exhaust clean?

C
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Old 03-15-2010, 08:01 PM   #8
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I'd take the sensor out. It's the right way to do it, and it's easy to do on a miata.
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Old 03-15-2010, 08:03 PM   #9
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Quote:
and it's easy to do on a miata.
My lowered suspension, R package lips, and floorjack beg to differ, but that's my problem.

C
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Old 03-15-2010, 08:03 PM   #10
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i sent the msq,cant figure how to do the log, and if you want the log from yesterday or for me to log it now
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Old 03-16-2010, 05:11 PM   #11
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could it be a ignitor or coil issue? i checked the plugs and there rich as hell
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Old 03-16-2010, 06:29 PM   #12
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ok so i just changed the coil and ignitor for the hell of it with no difference. like i said before it idles smooth but its still rich (12.0) but once you open the throttle it goes lean and stalls out, now if i really slowly open the throttle it will rev up but only until about 3 grand and it stalls out, I'm running the same tune i had on sat when it ran awsome. idle afrs at 14.0, cruise at 16.0ish and 13 ish when im on it. I made a log of it idling/ trying to rev it up
datalog201003161712.xls
i have checked everything but the injectors but it dles fine ect so can't see them being an issue so mechanically im out of ideas. unless the motors just fucked, cant see that tho
miata tune.msq
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Old 03-17-2010, 10:07 AM   #13
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Your MAP reading is very funny.

What MAP sensor is inside your ECU?
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Old 03-17-2010, 11:49 AM   #14
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^The recalibration fixed my issue, even though I cheated and didn't remove it from the exhaust (next time the car is on jackstands I'll do it, I promise). Thanks for the help Ben.

C
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Old 03-17-2010, 04:53 PM   #15
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just the original mspnp 90-93 map sensor, could it be pinched?
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Old 03-17-2010, 04:59 PM   #16
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Quote:
Originally Posted by chriscar View Post
^The recalibration fixed my issue, even though I cheated and didn't remove it from the exhaust (next time the car is on jackstands I'll do it, I promise). Thanks for the help Ben.

C
Awesome, but you still get a for your calibration "technique".

Quote:
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just the original mspnp 90-93 map sensor, could it be pinched?
Something's very fishy with your MAP signal. Check the MAP hose to make sure it's not pinched on something. The same thing that happens when you suck on a straw then put your finger on top of it could be happening to your sensor. Or the problem could be deeper.
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Old 03-17-2010, 05:13 PM   #17
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wow, i think i got the newb award for 2010 already, i guess when i put the computer cover back on the harness coming from the ecu pushed up against the map line. fml now i just need to wire in the stock 5 spd 3 wire tps sensor, sorry for wasting your time guys.
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Old 03-17-2010, 05:27 PM   #18
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Anwered questions are never a waste of time on a forum, now if I or somebody else has this problem down the road I'll know to check the map line.
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Old 03-17-2010, 05:32 PM   #19
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^Yes indeed. And similarly, I may have negatively influenced someone to stick a shop-vac up their tailpipe before calibrating their LC-1, as an alternative to removing the o2 sensor. (Hi Ben! )

C
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Old 03-18-2010, 08:54 AM   #20
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Quote:
Originally Posted by chriscar View Post
^Yes indeed. And similarly, I may have negatively influenced someone to stick a shop-vac up the car's tailpipe before calibrating their LC-1, as an alternative to removing the o2 sensor. (Hi Ben! )

C
Edited for clarification; we do drive Miata after all.
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