Any Mechanics about to help me with my Ford Focus Cmax problem?

Kingsd316

BlueArmy73 wrote: »

What would a mechanic check? What sort of costs?

Not really sure but ive just edited my previous post with a description of what happens if that fault appears, is that the symptoms you get cause it doensnt mention cutting out?

BlueArmy73

Kingsd316 wrote: »

Not really sure but ive just edited my previous post with a description of what happens if that fault appears, is that the symptoms you get cause it doensnt mention cutting out?

It doesnt cut out and go off completely. It cuts power and I have to crawl to a safe place and turn off engine.

asbokid

BlueArmy73 wrote: »

What would a mechanic check? What sort of costs?

The TPS, or Throttle Position Sensor, commonly wears out.. It's a rotary potentiometer that attaches to the spindle on the end of the throttle body (TB). If you trace the throttle cable from the accelerator pedal, it will go to one side of the TB. On the opposite side of the TB you usually find the TPS.

The track(s) on the TPS wear out, which creates drops to 0 volts or infinite resistance in the middle of throttle range, if you see what i mean.

The PCM picks up this and flags it as an engine fault. My car continues to run with a faulty TPS but with dead spots in the throttle range, but it sounds like there is a knock-on effect in your car, and other engine components are disabled by the PCM (Power Train Control Module).

You can check the TPS with a multimeter.. They don't cost much to buy new.

maninthestreet

BlueArmy73 wrote: »

What would a mechanic check? What sort of costs?

why don't you take the car to a garage and find out???

BlueArmy73

I will do now, was just hoping for some idea from any mechanics on here

jeannieblue

BlueArmy73 wrote: »

I will do now, was just hoping for some idea from any mechanics on here

You could've called DK and got all the info you needed before you went to the garage. Hope you have it sorted and not paid loads to a main dealer!

Let us know how you get on.

BlueArmy73

Been told it might be the throttle position sensor and to keep my foot away from the peddle when starting up. Then see how long I go without incident. I do have a habit of resting my foot on the peddle when starting. Going to see how that goes before I take it in.

asbokid

BlueArmy73 wrote: »

Been told it might be the throttle position sensor and to keep my foot away from the peddle when starting up. Then see how long I go without incident. I do have a habit of resting my foot on the peddle when starting. Going to see how that goes before I take it in.

You might need to re-set the PCM to clear the fault.

Often vehicle fault codes are memorised, even when the fault has been repaired. This is particularly true of faults with the braking system, which don't automatically clear for safety reasons.

BlueArmy73

Mine isnt memorised. It has happened numerous times and when management light goes off it seems to clear it. When I read it, it only had the 1 code on it which is latest one

asbokid

Try and get the Ford workshop manual for your car. It will list detailed testing procedures. These will show you exactly which component is faulty, and also how to replace it. You can download the workshop manuals on CD from the torrent fileshare network, I am told. Changing the TPS does need some basic setting up with the engine static but otherwise it is an easy job. If the TPS is found to be faulty, a car breaker will charge £10 or so for a salvaged one.