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Old 09-27-2010, 07:14 PM   #1
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Default My Miata won't start but it did two days ago.

I'm baffled, my miata will not start, it sounds the same with the coils in our out. Ive been running COP for over a year with no issues. It doesn't seem to be the battery, it doesn't seem to be fuel, the only thing I can think if is spark. I've verified each coil does have power, but I have not verified spark yet. I took the car for a drive on Saturday nigh, and it was fine except for missing a few times. Now nothing.

The car is a 92 NA6 with a t/28 toyota cops, and MSpnp. Any ideas of the best ways to narrow down the actual cause?
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Old 09-27-2010, 10:48 PM   #2
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1: Fire up Tunerstudio / megatune, and eyeball the display while cranking. Do you get a (somewhat) steady RPM indication and a green

2: Pop off one of the COPs and stick a spark plug into it. Ground the threaded portion of the plug by lying it on the valve cover or some other area such that it makes a good contact. Have someone crank the engine. Got spark?

3: Pop open the diagnostic box under the hood. Stick a jumper wire between FP and GND. Open the fuel filler cap. Turn the key to run, and stick your ear to the fuel filler. Hear the pump running? Try starting now.
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Old 09-28-2010, 01:21 AM   #3
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Let me know if you need anything. I have a garage full of ignition parts including a bunch of spare Toyota COPs. I also have a spare igniter.
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Old 09-28-2010, 03:32 AM   #4
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Joe, I just realized my loud *** fuel pump is no longer loud. When I turn the ignition on the pump does nothing. I hear a loud click click come from the front of the car after I turn the key. Could the click click I'm hearing be the relay, and if thats the case then the pump is dead?

If this is the pump I have to admit I'm a little annoyed, I don't think its even a year old yet. Its a 255lph.

Hustler, thanks for letting me know you might have some parts. At the very least that could save time, if it turns out its something other than the pump.
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Old 09-28-2010, 09:31 AM   #5
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ground F/P and GND and listen for the pump.
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Old 09-28-2010, 10:08 AM   #6
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Quote:
Originally Posted by apariah View Post
Joe, I just realized my loud *** fuel pump is no longer loud. When I turn the ignition on the pump does nothing. I hear a loud click click come from the front of the car after I turn the key. Could the click click I'm hearing be the relay, and if thats the case then the pump is dead?

If this is the pump I have to admit I'm a little annoyed, I don't think its even a year old yet. Its a 255lph.

Hustler, thanks for letting me know you might have some parts. At the very least that could save time, if it turns out its something other than the pump.
My bro-in-law has a 1990lph pump in Plano that he'll sell you.
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Old 09-28-2010, 10:51 AM   #7
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If thats the high pressure, or if it will flow enough to support 550cc injectors I'll meet him and by it today any idea how much? My ex-wife is coming to pick up my jeep soon so I need the miata running or I'm stuck on my bike for a bit. (Thats not really a bad thing, but I like options.)

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My bro-in-law has a 1990lph pump in Plano that he'll sell you.
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Old 09-28-2010, 10:58 AM   #8
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That's not technically how a pump is rated or how you should determine the size you need. The stock pump could flow enough for 2000cc injectors so long as it was run at something like 10psi fuel rail pressure.

All the pump does is make certain enough fuel is behind the injectors at all times so when they open they don't become starved for fuel. A good condition stock pump, run at normal fuel pressures as driven by our factory FPR, can flow up to around 300rwhp worth of fuel through the lines. It doesn't matter if you have tiny little 200cc injectors or 800cc injectors, all they do is spray out the fuel.

With that said, the 190lph, when driven on the factory FPR, with 20psi of boost (70psi of rail pressure), could supply enough fuel in the fuel rail to support up to around 350-375rwhp or so.
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Old 09-28-2010, 11:06 AM   #9
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Understood, I was just wanting to get something similar to what I was running before the car died. Its been a while, and I really can't remember why I went with the new pump in the first place, but I will happily defer to those with much more experience than myself.

Thanks for the info.

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That's not technically how a pump is rated or how you should determine the size you need. The stock pump could flow enough for 2000cc injectors so long as it was run at something like 10psi fuel rail pressure.

All the pump does is make certain enough fuel is behind the injectors at all times so when they open they don't become starved for fuel. A good condition stock pump, run at normal fuel pressures as driven by our factory FPR, can flow up to around 300rwhp worth of fuel through the lines. It doesn't matter if you have tiny little 200cc injectors or 800cc injectors, all they do is spray out the fuel.

With that said, the 190lph, when driven on the factory FPR, with 20psi of boost (70psi of rail pressure), could supply enough fuel in the fuel rail to support up to around 350-375rwhp or so.
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Old 09-28-2010, 01:58 PM   #10
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On my way to forced performance.
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Old 09-28-2010, 11:33 PM   #11
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Joe, I just realized my loud *** fuel pump is no longer loud. When I turn the ignition on the pump does nothing. I hear a loud click click come from the front of the car after I turn the key. Could the click click I'm hearing be the relay, and if thats the case then the pump is dead?

If this is the pump I have to admit I'm a little annoyed, I don't think its even a year old yet. Its a 255lph.

Hustler, thanks for letting me know you might have some parts. At the very least that could save time, if it turns out its something other than the pump.
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Old 09-29-2010, 02:37 AM   #12
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I put in the new pump but I still never heard it running. Even with the jumper in, I didn't hear the pump. However at one point I decided to try refreshing the tune, and the car acted as if it was about to start, and then back to nothing. Would a data log of the car cranking shed any light on anything.

I put the car on the charger for the night and will give it a try again in the morning before leaving for work. Is this likely to be a ECU issue? Oh I also noticed the pump said it is on while cranking then it goes back to off.
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Old 09-29-2010, 09:48 AM   #13
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time to check for voltage at the pump. could be a bad fuel pump relay.
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Old 09-29-2010, 10:52 AM   #14
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Quote:
Originally Posted by Braineack View Post
time to check for voltage at the pump. could be a bad fuel pump relay.
or a bad fuel pump. I went through 2 walbro 190s in a years time. both crapped out on me way too prematurely. i put in a 290 and its been a year with no problems at all
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Old 09-29-2010, 10:54 AM   #15
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sounds like he just replaced it.
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Old 09-29-2010, 10:56 AM   #16
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or a bad fuel pump. I went through 2 walbro 190s in a years time. Both crapped out on me way too prematurely. I put in a 290 and its been a year with no problems at all
290?
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Old 09-29-2010, 11:05 AM   #17
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whoops 255LPH. my bad
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Old 09-29-2010, 11:08 AM   #18
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sounds like he just replaced it.
my first one crapped out a week after i got it soooo...
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Old 09-29-2010, 11:19 AM   #19
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my first one crapped out a week after i got it soooo...

that's because you're friends with Murphy.
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Old 09-29-2010, 11:47 AM   #20
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I replaced the pump last night, and no significant change. So I guess the fuel pump relay, or may be the open circuit relay maybe? Seems like the fuel pump relay is around 75 bucks does anyone know of a source other than the dealer?
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