My daughter has a late 2001 Clio 2 with an 8 valve 1.2 litre engine and 75,000 miles on the clock. It is having intermittent problems, very familiar on these pages. Sometimes, when idling, it runs rough and the engine rpm cycles up and down between 600 and 1200 rpm. Other times the engine warning light comes on when driving at between 25-40 mph and the engine goes into limp mode with the revs surging between idle and about 3-4000rpm (frequency typically about once every second). This produces very hazardous situations on busy London roads. Its now virtually unusable and we need to decide what to do.
The fault code coming up on the OBD2 reader always points to the throttle pedal; potentiometer and the throttle body. These have both been replaced but the problem comes back. We have also checked that all connectors on the loom are clean and tight and that there are no signs of cable chaffing near the ECU or elsewhere. Note that on the 8 valve engine the ECU is at the rear nearside of the engine compartment behind the battery, not behind the engine so I do not think this model tends to suffer from this problem to the same extent as the 16 valve models.
From reading this site the remaining possibilities seem to be as follows:
Given the age and value of the car, there is obviously concern about spending large amounts especially if there is a real possibility that the results will prove ineffective.
Also, it is very difficult to know if the problem has been solved as the car runs fine most of the time and every time we do something we think its fixed, only to find subsequently that it is not. My daughter is now wary of driving it even if we change more parts but she cannot afford a new car (especially as she could not sell the car knowing its got these problems).
Can anyone advise what to try next please? She is getting quite desperate.
Incidentally we have an OBD2 code reader and have already attended to the faults it is pointing to (throttle pedal and body circuit). But I have seen some say that generic code readers are not suitable and we must go to Renault specialists who have the 'Renault Clip software. Is this true (I thought all petrol cars in Europe post 2001 had to use this protocol with diesels after 2004)? Also, from what I have seen on this site, expensive Renault diagnostics are often not very reliable anyway?
The fault code coming up on the OBD2 reader always points to the throttle pedal; potentiometer and the throttle body. These have both been replaced but the problem comes back. We have also checked that all connectors on the loom are clean and tight and that there are no signs of cable chaffing near the ECU or elsewhere. Note that on the 8 valve engine the ECU is at the rear nearside of the engine compartment behind the battery, not behind the engine so I do not think this model tends to suffer from this problem to the same extent as the 16 valve models.
From reading this site the remaining possibilities seem to be as follows:
- Hidden wiring loom faults (breaks, water ingress, connectors). A new loom costs £255 on this model plus fitting costs.
- Faulty ECU (could be very expensive).
- TDC sensor (inexpensive and easy to fit).
- MAP sensor (inexpensive and easy to fix).
- Oxygen sensors before and after the catalytic converter.
- Partially blocked catalytic converter (apparently can be cleared using inexpensive fuel additive).
- Coil pack.
- Fuel Injectors.
Given the age and value of the car, there is obviously concern about spending large amounts especially if there is a real possibility that the results will prove ineffective.
Also, it is very difficult to know if the problem has been solved as the car runs fine most of the time and every time we do something we think its fixed, only to find subsequently that it is not. My daughter is now wary of driving it even if we change more parts but she cannot afford a new car (especially as she could not sell the car knowing its got these problems).
Can anyone advise what to try next please? She is getting quite desperate.
Incidentally we have an OBD2 code reader and have already attended to the faults it is pointing to (throttle pedal and body circuit). But I have seen some say that generic code readers are not suitable and we must go to Renault specialists who have the 'Renault Clip software. Is this true (I thought all petrol cars in Europe post 2001 had to use this protocol with diesels after 2004)? Also, from what I have seen on this site, expensive Renault diagnostics are often not very reliable anyway?
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