I have a Renault Scenic 1.9 dci 2001. When braking the vehicle begins to slow down but the engine will suddenly increase in power pulling the car. If the brake is release then the power drops. Normal braking can be resumed. If the car is braked to a halt, the extra power being disconnected by dipping the clutch then the revs are found to be at 1500. When the brake is released then the revs drop. The EGF valve has been cleaned to no effect.

id check the aux drive belt sounds as if the vac pump belt or pump itself has gone bad , the waste gate from turbo is vac activated (no power) , and the brakes are vac boosted , so that leads me to believe you have a loss of vac some how

the switch is malfing.

1. You fix it.?
2. replace it.
3. get help (hands on)
4. have it fixed.

fuse location horn on megane scenic 1.4 2003

sorry scrap it

The first thing you need to do is have the engine control module scanned for fault codes, you will need a code reader for an OBD2 engine control system, then post the fault codes here. I would also see if the engine has fuel pressure, the test port is in the pipe that supplies fuel to the injectors under the hood top of the engine.

The Renault schedule for timing belts on the Scenic is 72,000 miles or 5 years. This applies to both the petrol and DCI models as both have timing belts not chains.

However, please be aware that it is common knowledge in the trade not to let the interval go past 40,000 miles because these engines are renowned for snapping belts at any time after 40k resulting in serious engine damage.

Haynes (who are renowned for their service manuals on many models) recommend a maximum interval of 36,000 miles between belts on this model which is exactly half that of what Renault say!

This information from Haynes is backed up by experience and reports from the trade on the common and unfortunate experiences of customers experiencing belt breakage at 45 k and below.

Hope this helps. Please do leave a vote for the solution. Thanks.

hi im having the exact same problem on my 2004 grand scenic 1.5 dci did you find out what the problem was regards gary

sounds like a loose fanbelt ... check tension on all belts they should only move 1/2 inch with medium pressure on them

Have you tried checking your throttle positioning sensor. Possible vacuum leak or check for carbon build up in the throttle body not letting the throttle valve shut all the way.

is this diesel a 1.5 dci or 1.9 dci