C5 1.6 Hdi - Poor Performance

[Randombloke]

Friend was complaining about very poor performance on a C5 1.6 HDi - I think this is the shared PSA/Ford engine, not so?

 

Checks in the engine bay did not show an accelerator pot, so I thought I would look in the foot well, inspired by the Coastline story of the bent/re-welded throttle pedal.

 

Two things transpired - First of all the car had the wrong aftermarket carpet liner fitted, that was tending to get under the accelerator pedal. It made sense to remove that was it did not fit on the locator lugs that the carpets for the front of this car usually locate on.

 

Secondly, it appears that there is a switch under the accelerator pedal, which in this case takes a fair amount of effort to make click over to the other setting. Unless the pedal contacts the hard stop underneath it there is no chance this switch can be activated.

 

My friend tested the car again and there was an improvement in performance. He made sure to push to the floor and feel the click that resulted from the end stop on the under pedal switch.

 

Is the switch mounted under the throttle pedal how the older DuraTorq engines got their short term torque boost?

 

Posted in case someone is thinking of spending money on diagnostics - this had a check over last service and no fault was found, bar a leaky injector that was replaced.

[iannez]

we get quite a few with dodgey carpet mats restricting throttle pedal. the switch is for when you have the speed limiter activated so when you floor it it deactivates the limiter for overtaking etc without having to turn the limiter on and off manually. when you let the pedal back up and release the switch the limiter goes back to its original setting. just a bypass switch realy.