Over revving? and Whistling/Whining?

[SMITHY]

Can you help?My Megane 1.4 16v 04 plate seems to be revving high? when travelling at 30 mph the rev counter goes up to 4000! Is this correct or is this just part of it being down to a 1.4 engine and that it needs more revving to speed up with or could there be a problem?
Also my car has developed a whining/whistling noise when it decreases in speed coming down from 70mph to 50 mph,but when it goes below 50mph the noise seems to stop(you here the noise when lifting your foot off the accelerator peddle).Thinking on getting it onto an engine analizer-would this be able to help with the diagnoses,before taking it to a Renault garage just incase they try to fob us off!!!![/b]

[r16chh]

Hi,

Mine made a whineing noise at 50 mph.
Was told this only happened in 5th gear and the only way to get it fixed was to replace the gearbox, which was to be done under warrenty, since then I have been to another dealer and ordered a new car (not renault) so someone else can have the problems that come with these cars.

Hope you get yours sorted, but my guess is its a new box needed.

[SMITHY]

Was your car making a whistling/Whining when decreasing in speed,just like ours or was it just when it hit 50mph?

[Stranger]

4000 revs at 30mph is not normal unless your driving round in 2nd, the whistling is almost certainly something to do with the gearbox - the car should still be under warranty so get it in to a dealer and don't let them fob you off, personally I wouldn't spend money on an analiser test until you've exhausted the warranty cover - that's what it's there for, make sure everything is documented incase the warranty runs out before the problems are fixed.

If you search the site you'll find plenty of similar problems, if not exactly the same, particularly where the box is concerned.

[Le Grand Crapaud]

Can you help?My Megane 1.4 16v 04 plate seems to be revving high? when travelling at 30 mph the rev counter goes up to 4000! Is this correct or is this just part of it being down to a 1.4 engine and that it needs more revving to speed up with or could there be a problem?
Also my car has developed a whining/whistling noise when it decreases in speed coming down from 70mph to 50 mph,but when it goes below 50mph the noise seems to stop(you here the noise when lifting your foot off the accelerator peddle).Thinking on getting it onto an engine analizer-would this be able to help with the diagnoses,before taking it to a Renault garage just incase they try to fob us off!!!![/b]

Who's the dealer? That WILL make a difference! Not an AC I trust !

BTW engine analysis won't help with this problem.. What's the mileage? What gear are you in when the revs increase to 4,000? Second?

[r16chh]

Mine only made this noise in 5th gear, going up to, or down to roughly 50mph.

[PGuk]

Hi,

I'm having the same problem. I asked last month is anyone else's 1.4 has been revving up to 3000, and no-one seemed to be able to help.

My car was built in Jan 05, 1.4 Dynamique manual, it revs up when decelerating or changing gear, decelerating and idles at randomly high or low rpm. Its had the throttle body, potentiometer and vacuum valve on the injector adjusted but still hasdn't been fixed. Even an engine management upgrade couldn't fix it. Renault Customer services have now agreed to get involved to try and get it sorted.

I can't believe I've finally found someone with the same problem! SO the big question, did you get it it fixed, and if so, what was the fault????

[jason_2801]

Did you ever figure out what this was as this is the same fault my car currently has and im struggling to figure it out

[tomalamix]

faults on the dash during cruise, any?

[jason_2801]

No it doesn't show any faults at all it idles at between 1600 and 1800 aswell so obviously when you are driving it is trying to accelerate because the revs are so high

[tomalamix]

did you clean the throttle body?

[traceyandcarl]

Hi - am having exactly the same problem - revving at 3k - even when foot completely off accelerator - in with renault dealer at the moment - but no news yet - they seem completely puzzled - have already had cam-belt and waterpump changed and also a new alternator and its been re-programmed - if you solve it can you let me know? thanks

[AlexB]

Hi Tracey and Carl,

Technically it is very simple, but somehow I would think that you will let the dealer to do the job. I hope you know the rule of three attempts leading to a full refund...

It is very strange that they replaced the alternator as a cure for over-revving. It does not make sense, unless they damaged it in the process or explained something wrongly.

[traceyandcarl]

Hi Alex - thanks for your reply - the car is still with the renault dealer - I have owned it for nearly 3 weeks and only had it for 3 days!! The are still scratching their heads as far as i can tell - if you have any ideas pleas do let us know - would really like my car back.....

[AlexB]

The first thing that come to mind is to use a cheap OBD tool, like elm327 (£20 on ebay) to read the OBD fault codes and record the live parameters of the engine under the fault. It may either tell us directly which electrical circuits are at fault or show inconsistencies in the parameters, which can be interpreted. The dealers also have a more powerful diagnostic computer (CLIP), where they can check and re-calibrate the throttle valve. This, of course, is done after the other possible causes, such as the throttle pedal circuits, throttle valve circuits and the air leak into the manifold are eliminated. It may be less straightforward if the dealers have damaged the car during servicing, Remember the alternator replacement, which did not make sense? In this case whatever they touched needs to be examined. On the other hand, it can be as simple as cleaning/replacing the throttle valve and replacing its O-rings, or checking whether the hose of the anti-pollution system is plugged in or not.

The procedures of checking are described in the factory workshop manual, which nobody reads, and which is present in the sticky thread in this Problems section of this forum.