Spoon feed me MSP ansswerrr pleeease
#1
Spoon feed me MSP ansswerrr pleeease
Total MS noob and I'm just gonna go ahead and ask because I have midterms this week and cannot learn about my MS Pro until spring break next week.
I have a 01 Miata with that's basically stock and am dealing with a intermitten multiple random misfire code (p0300). From my research, it looks like it's my ignition coils BUT, heres the thing.. I just received a MSP PnP and am now wondering if I can plug it in just to see if I can test the fuel and ignition stuff and perhaps avoid wasting extra money. I have new spark plugs/wires and have changed the fuel filter. I think that leaves ignition coils, fuel pump, or injectors. I guess it's possible that the TPS or CAS is wonky but I am not getting any codes besides p0300. (I get the misfire when cruising and sometimes idle drop)
Please advise
I have a 01 Miata with that's basically stock and am dealing with a intermitten multiple random misfire code (p0300). From my research, it looks like it's my ignition coils BUT, heres the thing.. I just received a MSP PnP and am now wondering if I can plug it in just to see if I can test the fuel and ignition stuff and perhaps avoid wasting extra money. I have new spark plugs/wires and have changed the fuel filter. I think that leaves ignition coils, fuel pump, or injectors. I guess it's possible that the TPS or CAS is wonky but I am not getting any codes besides p0300. (I get the misfire when cruising and sometimes idle drop)
Please advise
#5
Not sure if it's a coincidence but I just got the code after fiddling with the tps plug.
I also caught it on my wideband.. After about 15 min of cruising, at very light throttle it feels like the car looses power. It makes kind of a brrrr sound. The AFR went from 14-15 to 16's. Even if I continue to push the gas with the same light pressure it feels like it has 20hp. If I mash the gas it moves forward again.
I don't know if the afr changed to 16's because the car went into some kind of limp mode or because there was not enough fuel.
#6
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AFR's of 16 means not enough fuel. Assuming you trust your wideband, an injector not firing will cause something like this.
In tunerstudio you can fire each injector with the car parked - do this. One of them may not fire, which will be your problem.
In tunerstudio you can fire each injector with the car parked - do this. One of them may not fire, which will be your problem.
#7
Thanks for the tip but I'm just wondering, let's say it's the coils going out and there's too much unburned fuel and causes a misfire, does the engine go into some kind of limp mode that is inherently a little lean? I just made a payment for some used coils with 55k miles on them for $55. I figure it's worth a try. If it's not fixed I'll hook up the MSP and see about the injectors before I change the tps and cas. If it's not the coils I hope it's the injectors because that would be a good excuse to get new ones
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