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2001 Runs only with FP jumped & No Tach

Old 08-22-2011, 11:20 AM
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Default 2001 Runs only with FP jumped & No Tach

2001 sitting since 2003. Replaced fuel tank, pump, filter, and normal items (plugs, fluids, battery, etc). Stock computer and I assume has immobilizer (LS package and has the "offset" loop in the key).

The fuel pump does not automatically activate when cranking. The car will start with the fuel pump relay jumped (FP to GND at diagnostics box). The dash tach does not register. The speedo and other gauges do.

I haven't scoped anything yet, but was curious if anyone has run into a similar problem before, and if so, the outcome.
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Old 08-22-2011, 11:24 AM
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Stock ECU under there? Might wanna check. Also, if the car has been sitting since 03, any possibility of rodents in there?
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
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Old 08-22-2011, 11:33 AM
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Stock ECU, or at least stock ECU enclosure under there.

No evidence of rodents or rodent related damage.
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Old 08-22-2011, 11:41 AM
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Does it prime on key on?
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 08-22-2011, 12:49 PM
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No
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 08-22-2011, 02:06 PM
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Does the fuel pump relay click when you ground 2M? That would eliminate the wiring as a source of the problem.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 08-22-2011, 06:01 PM
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Yeah I know; I have a schematic and a scope at the shop.

I just don't think I have 2 problems: (1) no tach and (2) no fuel pump. I thought they would be related.

New confirmation: I suspected the MAF might (literally) be toasted due to a flame belching backfire event that occurred at the first start. It back fired while spraying starting fluid, shot a flame, and blew the intake pipes, maf, and top of airbox off the car. The lower box caught fire. It was impressive. Well, the car starts and idles, and runs with light throttle. It bogs with moderate or heavy throttle. No change with MAF plugged in or unplugged, so I get the feeling it's toast. When I pull the scope out I can test it, but it's even easier to just put a new MAF in.
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Originally Posted by concealer404 View Post
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Old 08-22-2011, 09:17 PM
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Replace the relay.

With the maf unplugged, or dead it will run super rich.

Never spray anything across an airflow meter.
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Old 08-23-2011, 05:13 PM
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The car's wiring is as solid as it could be.

It needed a new MAF!!!! The tach came back to life and the fuel pump started running itself after replacing the MAF.
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Originally Posted by concealer404 View Post
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Old 08-23-2011, 05:29 PM
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Originally Posted by Ben View Post
It back fired while spraying starting fluid, shot a flame, and blew the intake pipes, maf, and top of airbox off the car. The lower box caught fire. It was impressive.



Smooth move Ex-Lax.

Glad you sorted it out. This gonna be a daily?
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Old 08-23-2011, 05:58 PM
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No, track car.

Also: Solid MIL but no code = dead ECU memory fuse.
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Originally Posted by concealer404 View Post
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