ignition or fuel issue

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Jay son

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Hello All,

Just came across this board while trying to find resources on the net for a resent issue I'm having with my 95 5.8 4x4 bronco. Here's the story:

Was driving along just fine, was at about 2500 rpm then the truck died. I pulled over, turned the truck off and restarted it. It started fine, I revved the motor a little bit with no problems; after this I put the truck in gear and started to drive. when I get to about 1200 rpm the truck hesitates very badly, I let off the gas and apply the gas again only to have the same issue. The hesitation almost seems as if the truck is being flooded with fuel, let off reapply and repeat some outcome.

Here's what I've troubleshot so far:

Fuel pressure gauge tied into the fuel rail and it shows when the truck hesitates I get more fuel pressure.

removed ignition module spout and had some problem (this set vehicle back to baseline timing)

disconnected mass air and had some issue.

Now when I let the truck sit for 15 minutes or so I can drive it about 100 yards before this all begins again. My thoughts at this point are that it may have a bad ignition module. Anyone else have symptoms like this before?

Here's a list of so of the trucks modifications:

1995 gt-40 short block

Crane Cam hydraulic roller

AFR heads

gt-40 lower intake/ cobra upper

80 mm mass air

30lb injectors

Fuel pressure regulator

65mm motor sport throttle body

MSD Blaster coil/ 8mm motor sport wires

roller rockers

Trucks been running with new motor for about 4k miles now, no problem.

Any suggestions are greatly appreciated. Thank you in advance.

 

BroncoJoe19

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Here's what I've troubleshot so far:Fuel pressure gauge tied into the fuel rail and it shows when the truck hesitates I get more fuel pressure.
I am pretty sure that is caused by a faulty fuel pressure regulator.

DO you have a haynes manual? If so they walk you through how to test it.

If not, let us know, and we can probably walk you through it.

joe

Oh and BTW... welcome to BroncoZone

Please enter your truck stats into your sig file.

Goto my controls....

joe

 
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Jay son

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I am pretty sure that is caused by a faulty fuel pressure regulator.DO you have a haynes manual? If so they walk you through how to test it.

If not, let us know, and we can probably walk you through it.

joe

Oh and BTW... welcome to BroncoZone

Please enter your truck stats into your sig file.

Goto my controls....

joe

Thanks Joe, I do have the manual so I'll give it a test and see what I come up with. It's an after market regulator, but I'm sure it will test the same as a standard regulator.

Jason

 

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