Fuel cut problem

[Eaglefreek]

My first Festiva used to do that when it was getting low on fuel. I pulled the fuel pump and the strainer on the end was in horrible shape. I installed a new one and it fixed the issue.

[dalebwilson]

Change the fuel sock attached to the fuel pump inlet. The fuel pump sits in a well or baffle with 2 holes that keep if full of fuel. If those holes are partially plugged you could be starved for fuel when the tank is low and going around corners.


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[fudge]

I have not attempted to fix this quite yet. I just made a camera mount and was testing it out and happened to record this problem, so I made a video of it. When I am exiting the turn I ease on the throttle (because I knew this would happen) and the whole time I am steady on the throttle but you can hear it cut multiple times.

https://www.youtube.com/watch?v=yml_T8jipVs&feature=youtu.be

[bravekozak]

Open the rear hatch and check the ground on the body right in the middle below the hatch ledge.

[WmWatt]

at what point(s) (time(s)) in the video does it occur? just for confirmation.

[fudge]

at what point(s) (time(s)) in the video does it occur? just for confirmation.

0:20

Checked the ground in that spot, looks good and well connected.

[bravekozak]

That's where the fuel pump is grounded. Pull the connector to the inertia switch apart, inspect the terminals for corrosion . If none, push them back together.
Remove the fuel sender access plate and do the same thing with that connector. If you have a test light you can verify the ground at both connectors. Every connector on our Festivas is an inexpensive non-watertite connector, except for the headlights.

[WmWatt]

Do you have a vacuum guage? Initially you suspected and exhaust problem. A vacuum guage might detect that. See the vacuum guage diagnosis thread at the top of this repair help forum page. While looking under the hood at the guage with the engine idling you can also pull on the throttle cable to increase rpm's and see if the engine cuts out which might be revealing.

I don't have the fuel injected engine so don't know much about fuel supply. But the Festiva does not have the world's most robust ignition system. (I'm not a Mitsubishi fan having owned a 1982 Dodge Colt.) How old is the coil? Just for fun I'd clean and gap the plugs and wipe down the ignition components with a clean rag. If the fuel system checks out okay I'd try swapping coils and distributors if you have spares.

[Greywolf]

Some of the stand-outs on this are that the fuel pump and fuel level sender are mounted on the right of the tank. The IN-TANK pump is also the source of your fuel pressure, so if the tank is low and you turn right - the gas will go to the left and the pump can suck air. It can also cause the level sender to bottom out, and send a NO-Fuel signal to the ECU - if that happens the ECU will not run the pump OR fire the plugs (? I think...).

So what is needs is to keep the tank full, and see if it happens on an acid-test sort of a test drive

[WmWatt]

"0:20 " yeah, thanks, I can hear the lower frequency sound at that point