(Car's a 2005 petrol 2.0 Duratec HE)

 

So, driving to work this morning on the M25... I've had cruise control on for the previous ten or fifteen miles. I've got a lorry tailgating me, so used the accelerator to speed up (cruise remains on at this point). After a minute or two of this, the car lost all power and started to slow. I picked up on what was going on at about 48mph, and floored it. No response - as if the accelerator was released and cruise was off. Of course, this has to happen right in the middle of J7 (so I'm three lanes out from a non-existent hard shoulder, in traffic, great, now I'm going to die....).

 

With the accelerator still floored, I manually switched off cruise control and immediately got full engine power back.

 

No warning lights, no CEL, nothing. No further misbehaviour on the remaining ten miles to work.

 

Is this a 'safety feature' because I was manually driving it quite a bit faster than the cruise control was set to for an extended time, or is it a fault?

 

Got a fifty mile drive to and from work each day. Nervous about this evening's commute home...

21 hours ago, Paul Marchant said:

(Car's a 2005 petrol 2.0 Duratec HE)

 

So, driving to work this morning on the M25... I've had cruise control on for the previous ten or fifteen miles. I've got a lorry tailgating me, so used the accelerator to speed up (cruise remains on at this point). After a minute or two of this, the car lost all power and started to slow. I picked up on what was going on at about 48mph, and floored it. No response - as if the accelerator was released and cruise was off. Of course, this has to happen right in the middle of J7 (so I'm three lanes out from a non-existent hard shoulder, in traffic, great, now I'm going to die....).

 

With the accelerator still floored, I manually switched off cruise control and immediately got full engine power back.

No warning lights, no CEL, nothing. No further misbehaviour on the remaining ten miles to work.

Is this a 'safety feature' because I was manually driving it quite a bit faster than the cruise control was set to for an extended time, or is it a fault?

Got a fifty mile drive to and from work each day. Nervous about this evening's commute home...

most cars with cruise control will disable cruise IF YOU FLOOR IT 

the pedal is meant to then operate normally - if its not something is not behaving as usual - the cars throttle is fly by wire (no cable) I guess check the operation of the three switches on the pedals (two on the brake and one on the clutch) might as well check the brake light are all functioning (had a bulb pop the filament on RR and the CANbus then decided to cut power to ALL three brake lights and NOT bother to tell the driver - but did in diagnostics - MORONS)... 

if its a petrol car - if above is not helping, may as well try the battery disconnect - with the battery out of the loop short the two battery terminals together for 30 seconds (this dissipates capacitors) reconnect and with all exterior lights off, interior lights off, radio off and fan blower motor off - start the car and leave to idle - without touching a pedal going from cold start till he fan cuts in - some how this reset the throttle adaptions...

if that's not helping get decent diagnostics on it - something is strange with the pedal or throttle body - if you have the kit maybe try this first... should be able to see if the pedal potentiometer is going from 0 to 100% reliably - they fail on other brands

Could be a sign that the cluster is starting to go down, but you have no lights, which is worrying.

Get a decent cable and FORScan and read the codes, see if you have anything