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Old 04-20-2007, 02:34 PM   #1
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Default By jumpering you mean....

Let me see if I go t this. Run a wire from the Fuel Pump (FP) port to the Ground (GND) port in the diagnostics box.
The problem is, my car will turn over for 2 secs then DIE. Not stall but die. Ive been told to try jumpering the fp. Am I right.
Thanks
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Old 04-20-2007, 04:39 PM   #2
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Maybe I missed something... what are you attempting to do by jumpering those two particular wires together?

The only thing I can recall that requires jumpering is to set your timing or idle... and I'm pretty sure it's not the Fuel Pump. I've been wrong before.
Check here for all the directions on timing/idle stuff: http://www.miata.net/garage/ignition.html
Standard practice is to use a paper clip... it's tough to jam a wire into the connector.
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Old 04-20-2007, 04:44 PM   #3
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you also jumper when you're trying to figure out what psi you have on the fuel rail. Maybe he's wanting to check if the pump is going out. My guess would be to check fuel components, filter and spark plugs before anything else.
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Old 04-20-2007, 05:32 PM   #4
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Ive been told the reason my car is shutting down is because the MAF may be malfunctioning, shutting off the fuel pump at start up. By jumpering the fuel pump, it will remain on checking to see if the MAF is bad. Would that work?
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Old 04-20-2007, 07:08 PM   #5
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sounds right to me, for a car fitted wiith a afm.
does your car have a maf or an afm ? maf's do not have a switch that turns off the pump, afaik.
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Old 04-20-2007, 07:39 PM   #6
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Are you getting a CEL?
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Old 04-20-2007, 07:52 PM   #7
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if no CEL, might be the pump...
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Old 04-20-2007, 09:45 PM   #8
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His question will make a lot more sense if you read the other two threads on the same thing.

See
https://www.miataturbo.net/forums/showthread.php?t=9169
and
https://www.miataturbo.net/forums/showthread.php?t=9171

cmr991, just stick a paper clip into the diagnosis box connecting FP to GND. This forces the fuel pump to stay on whenever the key is in the run position. The AFM has a switch in it that normally keeps the fuel pump turned on whenever the engine is running. If you have damaged that switch or the wiring to it, the car will do what yours is doing, start and then quickly die. If the car idles like normal after jumpering the connectors, your problem lies with the AFM or wiring to it.

Also, you can just ask these extra questions about the AFM and Jumpering in the original thread. The questions make a lot more sense when you can read the background behind them.
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Old 04-20-2007, 10:27 PM   #9
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try GND and TEN
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