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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
The battery was removed about 3 weeks ago when replacing my clutch master.
What have you done to your MSP today?
- Thread starter baconbitz
- Start date
The battery was removed about 3 weeks ago when replacing my clutch master.
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- 1989 RX-7 GXL Blaze Red
how many miles? That's a weird symptom. your description reminds me of fuel cut/ studder.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
Miles? Since replacement of the CMC? No more than a couple of hundred, but this was doing this prior to that. It's been doing this for ~800-1,000 miles. Seems more so since the temperatures have been in the upper 80's and 90's, but I can't say that with 100% certainty.
float_6969
Member
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- 2003.5 MSP Blue #2450, 1995 Nissan 240sx, 1996 Mazda Miata
It sounds like weak spark/spark blow out to me. Every time I've seen a weak fuel pump, it would just lean out in the high boost/high RPM range and consistently misfire. Try lowing the boost. If it goes away with less boost, it's an issue with weak spark.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
One would think that if it's weak spark (new plugs, coils and wires BTW) the fuel mixture would be rich, not lean during the occurrence.
a missfire usually reads lean on a wideband as raw fuel is passing over the sensor which the wideband wont read.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
So, it will cause a false-lean, then? I was curious about that, but assumed that there was enough heat in the combustion chamber to atomize/burn it enough so that it would not do that.
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If you are on the stock ignition system, you need to upgrade. Stock coils are not strong enough. You could try closing the gap on your plugs to see it makes a difference.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
I can't see the OEM ignition system not being able to handle my modifications and am fairly certain there are cars making substantially more power than mine on the OE system.
16-19psi is a lot for stock coils, I know in the Miata world people experience spark blowout above 15psi and i know Miata ignition coils are stronger than the valve cover coils on the protege.
shane02pro5
25ish_psi
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- New Caney TX
I have been through several sets of coils but am close to 380whp for a considerable time without any ignition problems but I'm also pulling proper timing. Maybe need colder plugs gapped a little tighter. I couldn't imagine how fast that little thing hits full boost.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
Hell, I've been through 3 sets in 35k miles and 28k of that was basically stock. When I say stock, I mean FMIC, SSAFC, and nothing more than 12psi (at least not any longer than a few seconds).
And it spins quick.
I have my plugs gapped at .030, but I'll shorten it to at least .028. I also have 4 or 5 extra coils that I'll swap out, too.
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- 2003 Mazdaspeed Protege 1660, 2004 Winning Blue RX8, 2005 Mazda6
The more I think about it, when I was having issues and going through plugs because at the time I was using AllData specs to gap them- listed it the same as the N/A Protg- the feeling was almost identical.
I'm going to check my MAF voltage, though, due to the DTC that's set.
I'm going to check my MAF voltage, though, due to the DTC that's set.
shane02pro5
25ish_psi
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- New Caney TX
Once my boost got up there I had a real hard time not freaking out the maf sensor no matter how perfect the tune was... But you should be nowhere near that point but without having throttle pump adjustments I'm imagining your always going to be dipping lean.
