87 STX dumping fuel

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Nov 12, 2011 | 04:19 PM

90rangerguyNC

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87 STX dumping fuel

After an engine swap my 87 ranger stx 2.9 is dumping fuel to the point its fouling out the plugs. What could cause this?
Also my temp gauge and fuel gauge do not work and I cant figure out why.

Nov 12, 2011 | 05:19 PM

bratman2

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From: Aurora, NC

Possibly fuel pump diaphragm.

Nov 12, 2011 | 06:45 PM

Bullitt390

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Quote:

Originally Posted by bratman2

Possibly fuel pump diaphragm.

I think you mean fuel pressure regulator

Josh

Nov 12, 2011 | 06:58 PM

cj06

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From: CASA GRANDE AZ

Quote:

Originally Posted by Bullitt390

I think you mean fuel pressure regulator

Josh

X2 ^^^^
ALSO IS IT FOULING ALL PLUGS OR JUST SOME ?
if it is 1 or a couple then the injectors are shot !

Nov 12, 2011 | 09:38 PM

90rangerguyNC

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Fuel pressure reg. is what I was thinking. I have another one hangin on the wall in the garage im gonna try in the morning. It is fouling out all the plugs when its cold with fresh plugs it runs great but as soon as it warms up it starts to spit and sputter and lose power.

Also dumb question what is the switch on the dash to the right of the steering column? It can go either way but rest back in the middle when you let go

Last edited by 90rangerguyNC; Nov 12, 2011 at 09:39 PM. Reason: sp

Nov 12, 2011 | 09:48 PM

Bullitt390

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Quote:

Originally Posted by 90rangerguyNC

Also dumb question what is the switch on the dash to the right of the steering column? It can go either way but rest back in the middle when you let go

Do you have dual fuel tanks? Usually the tank selector is in that location, but it shouldn't "spring" centered.

Josh

Nov 12, 2011 | 10:03 PM

90rangerguyNC

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No just the frame tank. I pulled the switch and it does have wires running to it but i couldn't track them. The switch is definatley spring centered

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Nov 12, 2011 | 10:28 PM

90rangerguyNC

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Speaking of a/c my truck has been upgraded to the newer a/c think it could be for that? Looks to be a factory switch is the only thing that gets me.

Nov 12, 2011 | 10:31 PM

#10

90rangerguyNC

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Also Ive never heard of bad injectors causing to much fuel on all cylinders. Is it possible?

Nov 13, 2011 | 03:06 AM

#11

mebe2k

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From: Ford, WA

When my 88 had a bad o2 sensor years back it would dump fuel and run like a POS.. but it never fouled the plugs.. just blew a crapload of black smoke..

Nov 13, 2011 | 09:24 AM

#12

Bullitt390

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Quote:

Originally Posted by mebe2k

When my 88 had a bad o2 sensor years back it would dump fuel and run like a POS.. but it never fouled the plugs.. just blew a crapload of black smoke..

That's interesting... with a bad O2, the engine should run open loop and wouldn't be dumping fuel. Although gas mileage would suffer. Not much different than a bad t-stat that opens too soon. Engine computer won't go into closed loop and remain open loop, using more fuel.

Josh

Nov 13, 2011 | 02:49 PM

#13

mebe2k

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From: Ford, WA

i asked the guy at the auto part store about it and he said either the MAP or the o2 sensor..i started with changing the o2, and the problem went away.. engine ran good afterwards..it was the orig. o2 with over 100K on it.. it must have been giving the computer some out of whack readings..

back to the OP's problem.. could it be a funky TFI module? he said it fouls the plugs after it warms up.. usually thats when a bad TFI starts acting up?