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Old 11-19-2008, 02:32 PM   #1
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Default So my car wont start.

Ok so I have a 99 Miata with virtually no mods, the only "mod" it has is the over clocked ecu and the cat has been hollowed out.

Ok on with the problem, it just started today about an hour ago. When I go to give it almost any amount of gas it wants to cut out. I replaced the plugs, fuel filter about a year ago and i just replaced the fuel pump like 4 months ago. If I slowly give it gas it will rev up but any abrupt throttle increase and it cuts out, not stumbles but just cuts out. Also when I go to start it it wants to stumble when starting. It idles kinda high at first but then it will go down to a normal idle and sit there perfectly.

Any ideas?
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Old 11-19-2008, 02:33 PM   #2
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any stored codes? smell like fuel?
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Old 11-19-2008, 02:50 PM   #3
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any stored codes? smell like fuel?
the stored codes are not accessible do to the over clocked ecu but YES it does smell like fuel.
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Old 11-19-2008, 03:25 PM   #4
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Ground a plug on the head and try to start it. See if there is consistant fire.
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Old 11-19-2008, 03:39 PM   #5
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Ground a plug on the head and try to start it. See if there is consistant fire.
I just went out and was going to do that and decide "Hey I will try and start the car again just to see if it will idle so i can recharge the battery" well it started right up and runs fine now. I dont have a clue as to what it is but a random fix is not a true fix imo.
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Old 11-19-2008, 04:42 PM   #6
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somehow it was/is flooding...
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Old 11-19-2008, 04:49 PM   #7
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afm no good maybe?
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Old 11-19-2008, 05:53 PM   #8
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somehow it was/is flooding...
well then thats not good cause over-clocking the ecu supposed to actually lean it out slightly
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afm no good maybe?
i actually have a maf but i thought about that too and unplugged it and the car changed the way it acted.
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Old 11-20-2008, 12:54 AM   #9
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Originally Posted by redrumracer View Post
well then thats not good cause over-clocking the ecu supposed to actually lean it out slightly


i actually have a maf but i thought about that too and unplugged it and the car changed the way it acted.
Why exactly are you overclocking the stock ecu on a stock car? Are you referring to the "rpm crystal mod"?

Your car actually ran with the MAF unplugged?!
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Old 11-20-2008, 01:12 AM   #10
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Why exactly are you overclocking the stock ecu on a stock car? Are you referring to the "rpm crystal mod"?

Your car actually ran with the MAF unplugged?!
i overclocked(yes the "crystal mod") it so i wouldnt have to do an extra shift at the drag strip(dont flame) and yea it ran with the maf unplugged.
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Old 11-20-2008, 01:16 AM   #11
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That crystal mod is great! I need to do that to my car, since I have the 4.30 gears, but I'll probably just wait until MSPNP.

When you went out to restart the car today, had the battery died down completely?
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Old 11-20-2008, 01:19 AM   #12
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i overclocked(yes the "crystal mod") it so i wouldnt have to do an extra shift at the drag strip(dont flame) and yea it ran with the maf unplugged.

so you overclocked your ECU, which should lean the mixture, then unplugged your MAF so the engine doesn't know how much fuel to compensate with?

What's the temps like is GA, based on your "smelling fuel" statement, you're probably flooding it since the ECU doesn't know the intake temps and the correct amount of fuel to inject....it probably fails to 60*F.


and doesnt the MAF drive the alternator?
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Old 11-20-2008, 01:48 AM   #13
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That crystal mod is great! I need to do that to my car, since I have the 4.30 gears, but I'll probably just wait until MSPNP.

When you went out to restart the car today, had the battery died down completely?
it started to die down from all the cranking i was doing trying to get it to start

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Originally Posted by Braineack View Post
so you overclocked your ECU, which should lean the mixture, then unplugged your MAF so the engine doesn't know how much fuel to compensate with?

What's the temps like is GA, based on your "smelling fuel" statement, you're probably flooding it since the ECU doesn't know the intake temps and the correct amount of fuel to inject....it probably fails to 60*F.


and doesnt the MAF drive the alternator?
the maf is connected, i only disconnected it to see if it made a difference in the way it ran to try and eliminate it as a problem(sorry for the confusion). and it is right around 50 degrees or so down here.


Also it somehow is running right now, i dont know how or what happened but i would like to try and figure it out. mainly because if it happened once it will happen again and saying "oh well it went away" is not a solution to me.
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