POOR RUNNING WHEN HOT

1981 Ford Fiesta

Tiny

andemk1fiesta

June, 11, 2010 AT 2:55 PM

Engine Performance problem
1981 Ford Fiesta 4 cyl Front Wheel Drive Manual 33000 miles

Hi, I have a Mk1 fiesta 1981 1.1L, the problem is: when I start my car and drive away from cold it will pull away lovely with just a touch on the accelerator, the pedal feels nice and light and responsive and the car revs freely and pulls along lovely, then as the car warms up it seems to bog down and needs to be revved harder just to get it to pull, and feels like I only want to use a light acceleration and change up as soon as I can because it seems to be killing it if I try and drag each gear out. I have changed the points, rotor arm, leads, dizzy cap, plugs, condensor, air filter, oil and oil filter, set the dwell angle with a dwell meter, set the timing but it still wont play ball, I am convinced it's once the car is warmed up that is causing the problem.

FOUND 1534 RELATED QUESTIONS

Running Hot

15 ANSWERS
2 IMAGES

5 Answers

Tiny

Dave H

June, 30, 2010 AT 5:02 AM

Check you have good fuel pressure from fuel pump when warm

Tiny

andemk1fiesta

June, 30, 2010 AT 4:02 PM

Hi, I have a spare fuel pump I could try, is it the fuel pump you mean? Plus, what could make it have low fuel pressure when warm, that would be really handy to know.

Tiny

Dave H

July, 1, 2010 AT 4:49 PM

A worn fuel pump will give low pressure and the car will eventually stop running

Tiny

andemk1fiesta

July, 2, 2010 AT 3:15 AM

I understand that but you said check I have good pressure from the pump when warm, wouldnt the pressure be just as bad when it was cold too?

Tiny

Dave H

July, 4, 2010 AT 6:38 AM

You should check when cold. Then when hot. The pressure will be slightly lower when hot if the pump is failing internally. You shouold have at least 35psi to keep the car running

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