Anyone have Miata experience? (Misfire video and question)

Non-technical 240sx stuff in here.
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nelson240sx
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Anyone have Miata experience? (Misfire video and question)

Post by nelson240sx »

After trying to be a member on a few Miata forums, all I've figured out is 99.9% are internet thugs. Not really car guys, I feel like they just jump on the coat tails of others. They have opinions, but have nothing to backup their way of thinking... Lol.

I can't stand them :angry-cussingblack:

I'll have better luck coming to a forum with intelligent people even though it's not a platform they are not familiar with.

Stock Ecu, Mafs, injectors, etc

The car has done this since I owned it...... After sitting all night, when I start her up in the morning and start to drive her she will start to miss horribly just before becoming fully warmed up. She'll throw a tantrum for maybe 10-15 seconds and then she will idle/drive fine. The only other time she will start to miss out is when I give her more than 1/4 throttle..... The video doesn't show the cold miss since I had already driven her that day and she only does that after sitting over night. If it was just under heavy load then I would think it was running out of fuel, but since it does the same thing when warming up at idle...????.... There are also quite a few stock miatas running 5psi with no issues.....So far I've replaced:

New Plugs NGK bkr7 @.025" (two steps cooler than stock)
New NGK blue wires (everyone swears by these wires)
New Coil packs
Swapped the CAS with one from a good running car
Checked/clean grounds in engine bay
fuel pressure gauge hooked up (pressure is steady during miss)
Wiggle all the wires/connectors
Check timing

The only codes the Ecu is throwing are for the egr and purge solenoids (previous owner removed and blocked off). I am curious if the stock Ecu will cut fuel if the Mafs reads too high of voltage or something???? From what I've read it doesn't. I have bigger injectors and an AEM but don't want to add those until I have a good running car with no issues ( I don't want to over complicate things by adding possibilities). Sounds like a hard cut right (spark cut)?????

Any ideas?

http://youtu.be/8XcUkjFwVfM
KA24E-T 06/06 to 10/09 (T25 then H1C Holset) - sold
KA24DE-T 12/09 to 10/11 (T4/TO4E) - sold
KA24DE-T 11/14 to 8/15 (T4/TO4S BB) - sold
SR20DE-T exo-car build 06/13 to 3/16 (EFR6758)
^ now VH45DE-T 6/16 to 10/21 (Billet T04S BB)
^now KA24DE-T 1/22 to current (EFR 7163)
Miata 1.8 turbo 9/15 to 3/17 (VF39) - sold
KA24DE-T build 8/17 to 4/19 (EFR6758) - sold
12.6:1 Turbo KA-T 4/19 to 7/21 (EFR7163) - sold
Mori
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Re: Anyone have Miata experience? (Misfire video and questi

Post by Mori »

I can't help with your Miata's problem; I just got one myself. As for forums, did you try Miata.net? I posted a question there and they were pretty nice. I stay away from Miata Turbo altogether. I browse Club Roadster but probably wouldn't post there. I've bought parts from MiataRoadster.com and had excellent experiences so if it's related to MiataRoadster.net, then you might have luck there.
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nelson240sx
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Re: Anyone have Miata experience? (Misfire video and questi

Post by nelson240sx »

I'll have to give that a try.... The only Miata forum I'm apart of is Miata turbo.
KA24E-T 06/06 to 10/09 (T25 then H1C Holset) - sold
KA24DE-T 12/09 to 10/11 (T4/TO4E) - sold
KA24DE-T 11/14 to 8/15 (T4/TO4S BB) - sold
SR20DE-T exo-car build 06/13 to 3/16 (EFR6758)
^ now VH45DE-T 6/16 to 10/21 (Billet T04S BB)
^now KA24DE-T 1/22 to current (EFR 7163)
Miata 1.8 turbo 9/15 to 3/17 (VF39) - sold
KA24DE-T build 8/17 to 4/19 (EFR6758) - sold
12.6:1 Turbo KA-T 4/19 to 7/21 (EFR7163) - sold
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supakat
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Re: Anyone have Miata experience? (Misfire video and questi

Post by supakat »

Only recommendation would be the CTS.
12.96 @ 116.36 - 2.1 60ft - 11/2011
13.1 @ 114 - 2.3 60ft - 8/2012
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