Modus 1.4 limp or not? - Renault Forums :: Independent Renault forum

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post #1 of 14 (permalink) Old 17th February 2017 Thread Starter
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Modus 1.4 limp or not?

Hello expert Elf's.

After doing some research I have discovered similar posts, but not the same.

I start the vehicle in the morning and drive for about half an hour on open road with not much traffic no problems power acceleration all good.
I come to a bottleneck on the freeway where you are forced to standstill.
Watching the rev counter, it suddenly drops by 200rpm within 15 seconds.
When trying to accelerate again the vehicle coughs, splutters and backfires when changing gears.
When traffic has resolved and the vehicle is still in this state once the accelerator pedal is pushed flat against the floor all the power comes back and that is the only drive-able position on the accelerator.
I you carry on for 5min or so it clears and the idling revs come up by 200rpm and the whole accelerator pedal is available again.

In a nutshell, if you keep the vehicle above 1500rpm it will never go into this mode, but if you start to idle then within 20sec it comes back.

What be the thoughts on this one, is this limp mode or not?

Many thanks
Cheers

Zedd
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Modus 1.4 limp or not? Engines Zxdan 13 379 17th February 2017 01:37 PM
Battery charge fault **Fixed** (limp mode). Engines ours2012 28 927 1st February 2017 09:11 PM
Hello Elf's Welcome to RenaultForums Nottnoc 18 313 1st February 2017 06:50 PM
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post #2 of 14 (permalink) Old 17th February 2017
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Re: Modus 1.4 limp or not?

Check your throttle body is not dirty....

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Re: Modus 1.4 limp or not?

Thanks, I already did that, it was very dirty. Sprayed it out with carburetor cleaner.
I have a 2l Scenic, on that vehicle I took throttle body out and even opened it up where it is is factory sealed and found the mechanism on the inside was also very dirty, just have no idea how the dirt gets into the sealed unit.
Maybe I should open up this one as well.
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Re: Modus 1.4 limp or not?

Hello again Elf's

I wish to update my progress.
After finding the alternator fault, the battery charge fault has never returned. However vehicle will start perfectly and idle at about 1000 rpm if left to idle within a minute the revs drop to 800 rpm, if you try to drive now the vehicle feels like its running on two pistons.
If you are persistent and keep foot flat on accelerator it coughs and backfires and eventually takes off. Once you let it idle again the fault returns, but if you get onto a main road without any stops it clears completely until you get back to stopping, then it faulty condition all over.
Found a fuel filter that was completely blocked and somehow the vehicle still managed to run. (replaced)
I have two alarms
Airbag and steering, I don't know the reason for the steering because the steering works just fine.

I have already replaced the:
injectors
coils
spark plugs
key set ecu and fuse box
all the sensors except crank sensor, which I cleaned
throttle body

Its been taking me weeks to sort out and I don't seem to be getting any closer

Any ideas anyone?
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post #5 of 14 (permalink) Old 18th March 2017 Thread Starter
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Re: Modus 1.4 limp or not?

Hello everyone,

I would like to update progress, went to buy new inlet manifold seals from Renault, were I fount a workshop manager and he told the vehicle will never go into limp mode if the engine light is not shining. So that ends all my speculation on limp mode.
I then told him what the car does with the spluttering on idle and in the meantime I also discovered that when pushed hard on uphill it seams to suffer from fuel starvation.
He said I should check pump pressure and should not be below 3.5 kpa.
My test showed 3.3 kpa, so I blocked off the return flow and pressure went up to 4kpa.
I just reconnected the engine injector rail and spluttering disappeared, so I'm off to buy a new pump.

I would never have thought of this myself because logic tells me that if a fuel pressure problem exists, it should only affect the vehicle at a higher speed and not at idle.

Anyway hopefully some can learn from my experience, I will complete the repairs and write a final post if successful.

Cheers Zedd.
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