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Discussion Starter #1
Hi,

I'm a new member to the Forum and have a 2013 1.2 Clio IV (D4F D740 engine) with about 15,000 miles on the clock and a persistent hesitation or misfire.

It shows itself under acceleration (all the time) at anything above about 3000 rpm and appears to be a very brief hesitation or stutter - only for a fraction of a second, but continuing a second or so later as the car continues to accelerate. I've tried putting an injector cleaner in the fuel but it didn't help. I've also taken the crankshaft sensor off and cleaned it (incidentally, it didn't have the usual metal tip protruding - but I assume this is a later version). The sensor was magnetised and readily clung to any steel surfaces. Fuel consumption is only in the high 20's but it's very rural around here and it does a lot of short journeys.

The Check Engine light is not on and a code reader has not thrown up any fault codes.

From what I've read on the Forum it sounds like the following could be the cause:

a) ignition coil;​
b) spark plugs;​
c) crankshaft sensor;​
d) camshaft sensor;​
e) MAP sensor.​
Would anyone be able to confirm whether my list of likely suspects sounds reasonable (or suggest any alternatives or additions) and if it does suggest what order I should begin to replace things please? I intend to replace them one at a time and see if things improve rather than do so all in one go.

Grateful for any advice please.
 

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Super mod..
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28,368 Posts
Hi,

I'm a new member to the Forum and have a 2013 1.2 Clio IV (D4F D740 engine) with about 15,000 miles on the clock and a persistent hesitation or misfire.

It shows itself under acceleration (all the time) at anything above about 3000 rpm and appears to be a very brief hesitation or stutter - only for a fraction of a second, but continuing a second or so later as the car continues to accelerate. I've tried putting an injector cleaner in the fuel but it didn't help. I've also taken the crankshaft sensor off and cleaned it (incidentally, it didn't have the usual metal tip protruding - but I assume this is a later version). The sensor was magnetised and readily clung to any steel surfaces. Fuel consumption is only in the high 20's but it's very rural around here and it does a lot of short journeys.

The Check Engine light is not on and a code reader has not thrown up any fault codes.

From what I've read on the Forum it sounds like the following could be the cause:

a) ignition coil;​
b) spark plugs;​
c) crankshaft sensor;​
d) camshaft sensor;​
e) MAP sensor.​
Would anyone be able to confirm whether my list of likely suspects sounds reasonable (or suggest any alternatives or additions) and if it does suggest what order I should begin to replace things please? I intend to replace them one at a time and see if things improve rather than do so all in one go.

Grateful for any advice please.
Surprised its not put the engine light on most on the list will..what scanner did you use ?
 

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Super mod..
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Sorry, I don't know, it was one I borrowed for a few minutes and then returned.
Ok just that some dont hack it and read renault codes..plugs coil pack would log a code and crank sensor would probably send it into limp mode and another code..misfires can also be fuel related so dont rule that out as well..
 

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Discussion Starter #5
It may also be that my diagnosis of a "misfire" is wrong. I feel it as a momentary "hesitation" as the revs rise through the rev range above about 3K. It's millisecond's but the effect is felt through the car..
 

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Super mod..
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Check out the throttle body ICV for dirt.. if the ICV momentarily sticks because of dirt that might be the problem..
 

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Super mod..
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Do you know how to remove the air filter box.. if you do then remove that..then look into the throttle body and you will see a circular flap hinged through the centre..that flap is the IVC [inlet control valve ] butterfly valve its often called.. if here is significant dirt on that and the bore of the throttle body this could be your problem. .have a look o you tube at some vids to give you an idea..
 

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Discussion Starter #11
Excellent. Thanks Phil. I've had the air filter box off. Sorry, I didn't know the butterfly valve was called that. I'll have a look at it again tomorrow.

Thanks for all your help. I'll let you know how I get on.
 

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Super mod..
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Excellent. Thanks Phil. I've had the air filter box off. Sorry, I didn't know the butterfly valve was called that. I'll have a look at it again tomorrow.

Thanks for all your help. I'll let you know how I get on.
Ok but before you go ..what ever you do if you attempt to clean it.. DO NOT MANUALLY OPEN THE FLAP !!! its motorised and opening it manually will cause it to loose throttle position and then you will be in trouble..
 

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Discussion Starter #15
Hi Phil, please find attached a photo of the ICV on the Clio with the persistent misfire which we spoke about last night. Do you think it needs cleaning or does that look OK? In view of what you said about not trying to manually operate the ICV, I haven't touched the butterfly valve at all. It it is necessary to do so in order to clean it, am I right in thinking that if it's motorised that it's a "fly by wire" system rather than physically operated by a cable or rods and that the only way to open the throttle (the ICV) would be with someone inside the car pressing the accelerator pedal? If so will it operate with the ignition system on rather than with the engine running?
186590
DSCF2095.JPG
 

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Super mod..
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Yes that is dirty..its a fly by wire system and the body talks to the gas pedal..if you are going to have a go then you need some throttle body cleaner in spray form and a 1" paint brush and soft rag,,spray around the outside of the ICV lightly and then use the brush to remove any loose carbon..spraying should loosen it ..wipe away with the cloth carfully..when the plate is clean with the help of a second person turn ign key to first setting and push the gas pedal to the floor now check to see if the ICV has opened..if opened hold down while you clean at the back of the plate and body.. when happy release the gas pedal and switch off..leave for a while for any spray to evaporate and then start her up..let her idle for a while because it might be lumpy the tick over due to spray entering the inlet tract..
 

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Discussion Starter #17
Excellent. Thanks Phil. I'll see if I can get some throttle body cleaner tomorrow and let you know how I get on. It's one of those Renault cards that I insert into the slot under the radio. I take it I just put it in the slot - all the dash lights come on and get someone to press the loud pedal to the floor?
 

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Super mod..
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Excellent. Thanks Phil. I'll see if I can get some throttle body cleaner tomorrow and let you know how I get on. It's one of those Renault cards that I insert into the slot under the radio. I take it I just put it in the slot - all the dash lights come on and get someone to press the loud pedal to the floor?
Ah yes forgot it one of those cards on the later cars..proceed as you have said..good luck ..just remember ..what ever you do dont manually open the IVC in any way..
 
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