Knowledgeable Mechanics - Diagnosis Help

[RS Lemon]

Hi, I need help in diagnosing my problem with my car which is a 2015 CLIO IV RS CUP EDC.
I have been monitoring the problem for 2 months now and have listed symptoms below.

Dual Clutch Transmission Clanking Noise & Symptoms:

1. Best way to describe clunking noise sounds like metal joints that are loose sounding like clunk-clunk

2. Clunking noises will be most prominent and occur when engine/gearbox is warm/hot. Very rare to get the noises when cold

3. Clunking noises occur when clutch engages/disengages, gear changes. Usually at speed range of 0-30km/h

4. Reversing will make a clunking noise

5. Reversing then into drive will also make clanking noise

6. Gear transition from 1-2 at slow speed will make clanking noise most the time but not always

7. Gear transition on downshift 2-1 at slow speed will make clanking noise most the time but not always

8. When reversing most of the time there will be a noise like a rough whine

9. When on very steep hills incline/decline within gear range of 1st or 2nd at speed range of 10-20km/h you will hear a whine noise and sometimes car will jerk


Other Intermittent Problems & Symptoms (NOT SURE WHAT THE PROBLEM IS) :

1. Cold starts will always smell like petrol from exhaust, after warm smell is fine

2. On some occasions car will lightly jerk

3. On rare occassions engine will lightly bog when accelerating fast

4. When A/C is on symptoms gets worse and it feels like car acceleration is choking, lagging and not responsive on low rpms range 0-3000rpm. Usually will notice it when taking off from a stop there is a delay in acceleration/taking off. The delay is dangerous when I need to accelerate fast to make a turn or overtaking

5. When reversing and going into drive or when on a incline and car rolls back abit and then I gently tap the accelerator to go forward the car will feel like it is going to stall and cut out for 1 second and then comes back to normal. This problem happens very intermittently and has only happened 3 times now. (not sure if this related to this or my transmission?)


QUESTIONS

Does anyone know what the problem with my car is judging by all the symptoms I have listed?

Also with my transmission noise it should not be making these noise right? These noises should not be normal at all unless there is something wrong?

Sorry for long post but I really need to know what is wrong with my car before I take it to Renault. I want to avoid being lied to and have them telling me that these problems are all normal and later end up with a big bill since not under warranty anymore.


Thanks I hope you all can help diagnose my problem will mean alot as I’m stressing so bad =[

 

[Sash]

5. When reversing and going into drive or when on a incline and car rolls back abit and then I gently tap the accelerator to go forward the car will feel like it is going to stall and cut out for 1 second and then comes back to normal.

Mine does this, like it’s got confused about being a gearbox ?

 

[mantis946]

I’ve not had any of these gearbox issues with the trophy I’m afraid, speaking from a mechanical perspective - you would get a fair few of these symptoms from worn engine mounts, the lower gearbox mount in particular.
If you can get a video of some of the noises, I’ll compare to my own car.

It’s worth having a look over on the official renaultsport forums for mk4 issues.
Best of luck.

 

[RS Lemon]

How long have you had your car? Are you first owner? And how many KM has it done?

Does the noise still persist? Has it gotten any worse since? Did you encounter any bigger problems later on or the noise did not cause any issues? I wonder what is the cause of this noise and will it harm my gearbox later on.

Example of the clunking noise would be like two metal joints that are loose at the joint. Noise would sound like clank-clank. Here is a video of the sound which is similar to my sound:

 

[Krarl]

It's a Renault Gearbox, they wont have put much effort into making it work properly. Just as long as it all bolts together is good enough for the French?

 

[RS Lemon]

I’ve not had any of these gearbox issues with the trophy I’m afraid, speaking from a mechanical perspective - you would get a fair few of these symptoms from worn engine mounts, the lower gearbox mount in particular.
If you can get a video of some of the noises, I’ll compare to my own car.

It’s worth having a look over on the official renaultsport forums for mk4 issues.
Best of luck.

Please read my above post I have attach a video of what the sound sounds like, though it is not my video.

Also I have taken it into the service centre and they have had a look at it but I am not happy with the result. They only noted down on paper the problem I had and I wasn’t able to go speak straight with the mechanics and take them for a ride to show the exact way the problem is caused. I knew it will be a struggle to get them to actually do something about it. - Does anyone know if I can get someone high up which is expert in Renault problems to come out and take a ride with me? What should I ask for? I assume the general service guys don’t know much than general maintain stuff.

Anyways, service centre done a EDC ECU software update, relearn adaptive learning and readjust the clutch friction point. The clunking noise has gotten better and less. But it is still there and now sometimes when the clutch grabs/bites I can feel it more. - Does anyone know what could be the problem?

 

[davo172]

Tbh if that was my car I would trade it in asap as if not under warranty the bill to sort it at Reno if its gearbox issue will be ridiculous!!
I wouldn't be prepared to take the risk of taking it in.

 

[mantis946]

Please read my above post I have attach a video of what the sound sounds like, though it is not my video.

Also I have taken it into the service centre and they have had a look at it but I am not happy with the result. They only noted down on paper the problem I had and I wasn’t able to go speak straight with the mechanics and take them for a ride to show the exact way the problem is caused. I knew it will be a struggle to get them to actually do something about it. - Does anyone know if I can get someone high up which is expert in Renault problems to come out and take a ride with me? What should I ask for? I assume the general service guys don’t know much than general maintain stuff.

Anyways, service centre done a EDC ECU software update, relearn adaptive learning and readjust the clutch friction point. The clunking noise has gotten better and less. But it is still there and now sometimes when the clutch grabs/bites I can feel it more. - Does anyone know what could be the problem?

When I had my issues I called RCS and they looked after me, they create case for the issue and work with the garage to get to the bottom of the issue. Not all of the dealerships are renaultsport specialists so some of them are not as familiar as some branches may be.
In race mode the clutch can be very bitey when setting off, but it’s very smooth in normal from my experience.