Running on 2 cylinders at cold start??? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-23-2009, 08:37 PM   #1
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Default Running on 2 cylinders at cold start???

Since I put my MS on (1990 car, full standalone with afm, built by me) Ive had issues with cold start. Until the temp guage reaches the middle of the scale, it runs on 2 cylinders (2 + 4 i think) with loads of unburnt fuel coming through the exhaust. Soon as it reaches temp, it springs into life, idles fine on 4cyl and then is just how you would expect.

Any ideas???
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Old 05-24-2009, 05:39 AM   #2
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It was 1 & 4 mate, on the same coilpack.
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Old 05-24-2009, 07:23 AM   #3
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Nice one richy, as he said! ^
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Old 05-24-2009, 10:47 AM   #4
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Quote:
Originally Posted by DMRider_10 View Post
runs on 2 cylinders ... Any ideas???
Yes, I have a brilliant idea: SEARCH and you'll find this thread: https://www.miataturbo.net/forum/t17031/
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Old 05-24-2009, 11:08 AM   #5
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Just read that whole thread, and checked my map, I already have them settings set to "on" and also (thought id mentioned this in my first post, obviously not) that im getting fuel, its spark which im not getting, thus unburnt fuel fromt he exhaust and running on 2
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Old 05-24-2009, 05:31 PM   #6
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Quote:
Originally Posted by evank View Post
Yes, I have a brilliant idea: SEARCH and you'll find this thread: https://www.miataturbo.net/forum/t17031/
And if you READ the question you'd realise it's nothing to do with that....
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Old 05-26-2009, 04:23 PM   #7
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Right bit more info:

All 4 leads are sparking under cranking, hot or cold start, but 1+4 not sparking once started if cold

When running on 2cyl (2+3) on cold start, using lead 4 for either cyl 2 or 3 and they still fire, so its not the leads (cant test lead 1 obviously due to the length of it)

Once warm, all 4 sparking perfectly fine

Wtf lol
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Old 05-26-2009, 04:39 PM   #8
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post the MSQ.
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Old 05-26-2009, 06:01 PM   #9
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Old 05-26-2009, 07:09 PM   #10
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hmmm dont see anything really...log it.
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Old 05-27-2009, 05:23 PM   #11
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2.xls

Ok theres the datalog of my car coming to operating temp. It shows:

Me holding the throttle at 1k on the tacho, which reads as 2k on the log (record 0-493)

Me keeping a constant throttle when 4 cyl jump into life (record 493)

Me still at the same throttle position with the revs now reading about 2.7k (records 500-679)

Me letting the car fall to proper idle of just under 1k (records 679 onwards)

Ive noticed now the car jumps into life at clt of 74 degrees C every single time?
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Old 05-27-2009, 05:48 PM   #12
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Tune your ASE and warmup enrichments. Tt's only happening when warmup mode is on. the instant it triggers off record 493 of 812 everything starts reading correctly.
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Old 05-27-2009, 05:53 PM   #13
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Is it possible to turn them off and see if it will start on 4cyl?

Also surely ASE is only to do with fuelling? Not spark?

Only settings I can see on WUE related to spark are the cranking pulsewidth settings, is that what you mean?
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Old 05-27-2009, 06:22 PM   #14
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Quote:
Originally Posted by Braineack View Post
Tune your ASE and warmup enrichments. Tt's only happening when warmup mode is on. the instant it triggers off record 493 of 812 everything starts reading correctly.
I don't get how tuning the ASE would help? I pulled the leads and there was NO spark getting to the plugs, yet on 2&3 it was fine.

The fueling is WAY off because 2 of the 4 clinders aren't sparking, (note not that they can't combust, there's nothing getting to the plugs), as soon as 1 & 4 kick in the AFR's go normal, (as you'd expect with all the fuel being set on fire )
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Old 05-27-2009, 07:00 PM   #15
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did you happen to build the spark output wrong and put it on the center LED not one of the others?
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Old 05-28-2009, 04:02 AM   #16
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That's a good shout brain....
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Old 05-28-2009, 05:31 AM   #17
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Will check this later when Im home from work....heres hoping!
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Old 05-28-2009, 02:33 PM   #18
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No luck. Everything seems to be as it should on my board :(


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Old 05-28-2009, 02:37 PM   #19
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Old 05-28-2009, 02:49 PM   #20
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that was my bright idea, there's still something with warmup mode causing it. I'd suggest send the msq and log to matt cramer to take a look at.


looking again, your Gair is adding a crap ton of enrichment as well, disable the clt-based air density corrections table, just to see if it reacts.
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