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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21858
Experience:  BEng hons Mech engineering, in auto industry 22 years
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what wrong with my ford focus 1.8 Mk11 2002 model, when I

Customer Question

what wrong with my ford focus 1.8 Mk11 2002 model, when I used over half throttle the car don't perform, there are no engine management light displayed.
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.

Hello

this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,

Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no account touch the sensor wires with anything physical as they are extremely fragile

Expert:  Matt replied 2 years ago.
Hi

do you still need help with this?