my set-up
11-06-2007, 12:58 PM
#43
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his gauge is reading off the manifold, so he'll see exactly what the engine sees.
you gotta have a vacuum leak of sorts thats causing the engine to run so rich. the ecu think it's getting X amount of air, but infact it doesn't so you go rich and runs like crap.
what's your vacuum at idle?
you gotta have a vacuum leak of sorts thats causing the engine to run so rich. the ecu think it's getting X amount of air, but infact it doesn't so you go rich and runs like crap.
what's your vacuum at idle?
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11-12-2007, 12:24 PM
#47
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put in the stock injectors, new spark plugs, another new o2 sensor, and another ECU. helped some, but it stil randomly bogs and studders, and most of the time has a really rich cruise and randomly will go real rich
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11-12-2007, 12:46 PM
#48
Talk about a real mystery. Reading thru the post, you are running rich and ignition stuff checks out okay, right? So running rich:
1) too high fuel pressure - you said pressures were okay so fuel pump/FMU seems to be working okay
2) bad injector (locking open/etc...) - you tried multiple sets so unlikely
3) bad AFM- again, you tried multiple sets with the stock injectors so unlikely
Assuming that your fuel pump, FMU, injectors, and AFM are all okay based on the above, there are only two other sensor that change fueling (aside from the gas pedal...haha) for the 1.6L:
1) o2 sensor - Since you changed sensors as well, is it possible you have a bad connection that is intermittently grounding out? Also, the stock ecu does not use the o2 sensor on a cold start until the car warms up so are your cold starts fine?
2) thermosensor at the back of the head - Again, a bad connection that grounds out the sensor intermittently would tell your ecu that the engine is really cold and dump in fuel.
For both, with a multimeter, you could find the ecu pin and test the readings.
My two cents. Interested to see what the final issue is.
1) too high fuel pressure - you said pressures were okay so fuel pump/FMU seems to be working okay
2) bad injector (locking open/etc...) - you tried multiple sets so unlikely
3) bad AFM- again, you tried multiple sets with the stock injectors so unlikely
Assuming that your fuel pump, FMU, injectors, and AFM are all okay based on the above, there are only two other sensor that change fueling (aside from the gas pedal...haha) for the 1.6L:
1) o2 sensor - Since you changed sensors as well, is it possible you have a bad connection that is intermittently grounding out? Also, the stock ecu does not use the o2 sensor on a cold start until the car warms up so are your cold starts fine?
2) thermosensor at the back of the head - Again, a bad connection that grounds out the sensor intermittently would tell your ecu that the engine is really cold and dump in fuel.
For both, with a multimeter, you could find the ecu pin and test the readings.
My two cents. Interested to see what the final issue is.
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11-12-2007, 01:26 PM
#49
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you know what. i have no CEL, but i do remeber getting a thermosensor code before. i just went outside and ran the codes (eninge is completly cold) and i am getting NO codes. the temp guage works fine. but my tach and water temp guage are really jumpy ever sence i put in the MMR solid motor mounts in several months ago (well before the turbo). a new coolant temp sensor is only $15 for a new one, i might just replace it.
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11-12-2007, 02:31 PM
#50
you know what. i have no CEL, but i do remeber getting a thermosensor code before. i just went outside and ran the codes (eninge is completly cold) and i am getting NO codes. the temp guage works fine. but my tach and water temp guage are really jumpy ever sence i put in the MMR solid motor mounts in several months ago (well before the turbo). a new coolant temp sensor is only $15 for a new one, i might just replace it.
There are three thermosensors in the miata. One on top of the thermostat housing for the fans, one small spade connector at the back of the head for the dash gauge, and one green connector on the back of the head that feeds the ECU. Make sure it is the green one in the attached pic.
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11-13-2007, 09:25 PM
#53
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the studder happens when your on the gas. it will do it at partial throttle and also at WOT and is completly random. idle speed and afr is also completly random
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looks like you'd get extremely dirty everytime you touch your engine bay
11-15-2007, 02:03 AM
#55
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Ok, Dumbass question from the newbie: Since you are running an afm but no recirculation from the BOV, will it not run rich when the bov opens? And I see you have a breather on the valve cover, but still a PCV valve hooked up. Could the PCV valve leak?
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11-15-2007, 02:59 PM
#57
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the BOV only matters when you are shifting. i have enough spacers in it to keep it closed at idle. pcv is still hooked up. but a leaking pcv hsa nothing to do with running rich, that would cause a whole other set of problems
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11-20-2007, 05:01 PM
#59
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some, but not all the way. i got stock injectors and AFM in. the super rich condition is gone. but the random bog and studder is still there. it will happen at partial throttle and at WOT also
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