Sage advice on common issues from luck3y8oy on Yahoo Answers
There are a number of things it could be, the first one is there maybe a fault on the throttle circuit, as that model of clio is fitted with a fly by wire system. This system suffers from wiring and component problems. The first thing the garage should do is a diagnostic test on the injection ecu, as this will hold any fault codes.
Once they retrieve the codes they should have a better idea of exactly where to look for the fault.
The most common problems are the ecu security cover rubs through the engine wiring loom and shorts it out ! also the wiring connectors to the ecu are filled with silicone which can give poor contacts causing intermittent problems.
There are two main components in the system, the throttle pedal and the motorised throttle body. the pedal will probably be the cheaper of the two at about £50.
But to be honest rather then waste money guessing you should get a diagnostic test done on the car to find out what codes are stored in the ecu… the clutch was never going to be the cause of this problem !
Consensus on Honest John that most issues with the 1.2 16v Clio are caused by:
- The metal cover on top of the ECU fouling the wiring and shorting (consensus = remove it!)
- Water damage to wiring underneath the battery tray
- Loose earth
- the ‘Heat’ sensor (wtf shrug)
- the ‘Map’ sensor (wtf i assume they mean either MAF or Lambda)
An anonymous user on Clipme.com has uploaded a video of the complete procedure for removing, cleaning and reinstalling the throttle body on a D4F code engine, which he claims has solved the cutout issue:
The clio was running strange recently cutting out at junctions, not idling right and on the open road not driving very smoothly. Also sometimes it failed to start which was caused by oil coming out from the air filter housing and dripping onto the crankshaft position sensor.
I did this to remove the throttle body and clean it out, also the crankshaft breather pipe is located in here. In the video i didnt actually clean these parts as i did that last week but they were covered in oil and crap, the crankshaft breather had a lot of old sludge which i had to scrape out but its very clean now. The throttle body took a bit of time with some carb cleaner but as you see in the video thats how clean it needs to be.
It has made a huge difference to the car, there is no more lights on the dash, it has been running very smoothly and on the open road there is no cutting out or spluttering when planting the throttle.
The products available for purchase from ecutesting.com generally support this theory:
- throttle body – Very common problem for all late renault clio’s, causes power los and stalling/cutting out problems £195
- ecu – This ECU is a very common failure for the Renault Megane/Clio 1.6/1.2/1.4/2.0 16V built after 1999, normally causing either a misfire on two cylinders or complete non start of the engine due to the immobiliser malfunctioning & water damage £400
So what do we need?
- Rocker gasket – ebay
- tube of instant gasket
- electrical contact cleaning solution
- carb cleaner spray
- 10mm socket, tx30 bits
- electrical tape (in case it is the wiring’s been fouled)
- A trolley Jack to support the engine (engine mount needs undoing to get rocker cover off)