Third week of MS troubleshooting
 

I got the car started and it idled! WOW. but after a few mins and it decided to die. Its running VERY rich, here is a log can someone help me out?

Post all the info about your car. I don't know what year, what engine, what type of MS, etc. I'm clueless. From the datalog your TPS sensor needs calibrating and you're running really rich.

Stock 1994 running a parallel MS1 using the 9495 PNP Base map.
I have NOT set my timing as im having loads of trouble with it. When i keep the car alive at 1k rpm, my timing light says im right at TDC (Not near the factory 10 bracket/plate) . As i adjust the timing on the MS it seems to be working the other way around, the closer it gets to the right setting (10) the worse the engine is running. I really hope i can get this thing sorted out, my turbo kit has been sitting patiently for about a month now.

Calibrate your TPS. I'd tell you how to do it, but it's probably different since I have MS2 not MS1. But do this.

You have to get base timing correct. I'm no expert with MS1 though. I know you can turn the CAS to adjust it, so do that to get it to 10* BTDC with the timing light sensor clamped on cylinder 1. (the front most one).

And post your MSQ if you can figure out how. Don't tell me what MSQ your running, and don't link me to where you got it. I already know. Actually POST the one you have on your megasquirt. This way people can go through it and make sure everything looks right. I downloaded the shit to read MS1 just to help people like you.

Are ALL the guages in megatune working? Name the ones that are/are not.

And don't answer half my questions. Don't make me ask 3 more times, etc.

TPS has been calibrated and base timing has been set, the car now idles on its own!

Every gauge in megatune is working (RPM, Coolant, pulse, duty cycle, MAP, Air temp, AFR and spark advance) . The AFR gauge is working and reading the same with my gauge but it always highlighted in red, i think this is because im running to rich.

Including a log file of the car idling and the MSQ straight from the MS.

Thank you Pat for all the help!

Cool. What type of O2 sensor are you running? Have you setup Megatune and Megasquirt for it? Have you calibrated it recently? I doubt it would even run at 7:1 AFR...

I am using an LC1 which has be calibrated about a month ago when i first started installing my MS. I have set ms to default lc1 0-.5v and only set the "EGO" to wideband without changing anything else. When i have my stock ecu with no 02 input going to it, the gauge reads 12.5-13 at idle.

holy hell, look at the PW and DC, lower your fuel map a ton

Wouldnt you think the PNP map should have everything preset to make it run normal? I do not want to "tune" around a problem, but if nothing else works out, i will have to do that.

Yeah don't touch the fuel map yet. If it's running "fine" then odds are it is, and the gauge i megatune is just lying. Like I said it wouldn't run at 7:1. You have go into MS configurator and tell it what type of wideband you have. Have you done this? And LC-1's are finiky. Did you wire it up EXACTLY as the directions specified, or did you do what you thought would work? Gotta follow them to the "T" or it won't work right.

Drive it and make a nice long log and post it up.

It smells REAL rich. and yes, i have wires going all over the place just to get to the proper ground spots. why would it read low on the MS but read 12.5-13 on a stock ecu at idle?

What reads rich on a stock ecu? The gauge in megatune or your gauge for your wideband?

Also, you can go into megatune and at the top click "basic settings">"engine constants 1" and look at your "req fuel" try making that number smaller. IE-if it's 12, make it 11 and see what the wideband reads.

on stock ecu, its the gauge for the wideband, not in MS. Adjusting the require fuel amount does have an effect. im able to get it to about 7.9 afr at about "8" required fuel but when i go lower it goes to 9>10>11>15>22.4 and dies off really fast.

I'm gonna guess you need to recalibrate your wideband. It would be the next step if I were you. Try letting the car sit overnight and then recalibrate it in the morning before cranking the engine. Most agree letting is sit long enough will make sure it's "free air" enough in the exhaust pipe. Or remove the sensor and then do it.

If you're lucky some of the MS1 people will chime in and help. There may be some simple common thing you need to do that specific to MS1 I don't know of.

Will try that. Just 1 more thing, my MAP reading with the key on without the engine on is at 94, 100 kpa = 14psi, something isnt making sense to me.

It is your wideband for 100% sure, Mine did this last week I starterd it and it read 7.8 afr and the car was fine just needed recalibrated

PS: kpa is 97 with key off for me, so it doesn't mean 14 psi

Lets hope so, ill recalibrate it tomorrow mourning.

your KPA would have to be around 194 for 14 psi of boost, also fill out your Signature

FWIW, Make sure your ground is on the back of the head with the ecu ground. That screwed me up at first. Then when I got that fixed.

My fuel was crazy rich, even after I straightened the WBO2 issue out. I reflashed my firmware and everything turned out fine.

I did have to lean my table out on Idle, and way richen the cruise. The map isn't perfect, but a very good start.
Good luck.

I used the ground that is near the throttle body, which every one says to use. Ive reloaded the firmware a few times. Currently im using the MS Extra.

So i recalibrated the lc1 and it got a LITTLE better. Without any editing the AFR was no longer pegged at 7.4 and went up to about 7.6-7.8. I changed the fuel required and was able to get it to idle at about 9.5-10. When i rev it and it gets anywhere near the proper AFR the car begins to idle bad and die quietly.

The gas smell is overwhelming.

Frustration leve, lol. Mine's like infinity/zero right now....


Did you recalbrate with it in the exhaust after sitting or did you remove it? I'd try removing it just to be damn sure. Sounds like it's off to me. What does the gauge for your wideband read vs. what megatune says? If your gauge reads reasonable numbers and MS doesn't, this is a software issue not a calibration issue.

Do you have the LC-1's output setup? IE-did you go into LM programmer and set it up? It's like 0-5V 10-20 AFR or something like that. Just make sure you do the same settings there that you do in megatune.

Waiting for the exhaust to cool before i take it out. The gauge and MS are dead on. I did not personally program the LC1 but since the gauge and MS are in spec i do not see as that being a problem.

If the are dead on with each other I would lean the idle out. My AEM only reads down to 10 AFR, I was pegged on ten. I had to lean idle out considerably.

WOOT! i just recalibrate it in free air and i think that solved a few problems. im fighting the fuel tables right now to get it to idle currently but im at 12.5 and its nice and steady.
The only problem now is if i rev it slowly it would lean out and die.

Ok, now im pretty mad. There is no way i can lean it out without it dying. When i slowly decrease the VE it would lean out, but its never steady. Its like once it gets to 14 i just keeps going slowly all the way to 22.4 which it then shuts down.

Im getting tired of this. Thinking of selling this pos and just buying a car where a tune involves plugging in a obd2 wire and press 1 button.

MS can be one hell of a headache at times. Believe me.

I STILL don't think you have the LC-1 programmed correctly. For one, if you had it 0-5V 10:20 AFR, then it wouldn't spit out a 7:1 or 22.4:1 AFR in the first place. So backup and read about programing the LC-1 and do that.

I have it set to LC1 default 0-5v .5-1.5 lambda.
Here is what joe told me.
Ok, you've got an LC1 wideband sensor, set to the default of 0v = .5λ and 5v = 1.5λ. If you do the math, 0.5λ with gasoline is 7.35:1, and 1.5λ is about 22.1. So all you should need to do is go into MegaTune Configurator (which can be launched from the start menu or from within Megatune) and set it up for the LC-1 default.

Did you set it up in LM Programmer? Yes or no.

No i did not set it up in LM, but i think i found my problem. I think i have read more on the MS boards than i have in my last 2 years of college. Good thing too because i found this gem. https://www.miataturbo.net/forum/t26149/
Mine was on as well. As i turned it off, i was able to lower my VE tables by a factor of about .9. This gave me the idle that is in AFR table as 13.3.
I was actually able to drive the car! Now i have fine tuning to go, but at least now my urge to sell the car has diminished.

Im including a new log file of my very short run. There is 2 points that concern me, they begin at about record 940. My AFR goes max lean while my PW goes to 0. What could explain this?

Thank you pat for all your help, if you were here, id pour you a shot.