C4 loosing power for no apparent reason. Restarts OK.
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Thread: C4 loosing power for no apparent reason. Restarts OK.

  1. #1
    Tadpole Bruceg's Avatar
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    Default C4 loosing power for no apparent reason. Restarts OK.

    Our 2007 Citroen C4 (petrol, four speed auto) has on a number of occasions recently lost power for no apparent reason and then surged again, but then would loose power again and again. Pulling to the side of the road the engine could be revved easily and it would not seem to die, but there was very little power being developed. I was able to get the car home, but very slowly. Next day the car started OK and everything appeared normal. The same thing has happened before and a thorough check by a reputable specialist could find nothing amiss. I have read of other C4 owners in the UK having similar problems and in a couple of cases there appeared to be electrical interference from unrelated local electronic installations causing some mischief with the cars fly-by-wire components. I must say that each time that the car has played up it has been about the same 5ks from home. The family does have other frogs and they are running fine. Has anyone out there have any suggestions?

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    Last edited by Bruceg; 14th September 2015 at 03:54 PM.

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    1000+ Posts Ken W's Avatar
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    What is the size and type of engine eg number of valves etc. Does any error lights come on when the fault manifests?

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    Tadpole Bruceg's Avatar
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    Thanks Ken. It's a 2 litre 16 valve engine. No warning lights came on. The diagnostic machine did not indicate anything wrong when the car was first tested for the problem. It was first thought that perhaps the fuel level indicator was maybe not working correctly and car was running too low on fuel...it is a very hilly stretch of road when the problem has occurred. That has proved to be not the case so back to the service people this week for a long hard look.

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    Have a think about the pedal position sensor. There are error codes for this.

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    Fellow Frogger! renault12's Avatar
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    Fuse box under the scuttle panel in the engine compartment.

    Absolute sure fire culprit.

    You can inspect it easily enough by dismantling and having a look at the corrosion.

    They leak, corrode and the subsequent intermittent problems are almost impossible to diagnose as they're so sporadic and intermittent.

    New fuse boxes are available from CitroŽn.

    Depending on the severity and location of the corrosion, the logged faults will vary, but most common seems to be mixture control and emission system related issues (injector faults are also common as a result).

    Rough idling and "emission system faulty" seems to be the common starting manifestation followed by random shutdowns.

    Best of luck!


    Sent from my iPhone using Tapatalk

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    Hi.. I have a cx5 that has never given this problem but I used to have a 85 Nissan that would do the exact same thing.. The solution for the Nissan was to change the fuel filter.. Hope that helps

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    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by nigeljo View Post
    Hi.. I have a cx5 that has never given this problem but I used to have a 85 Nissan that would do the exact same thing.. The solution for the Nissan was to change the fuel filter.. Hope that helps
    Welcome to [strike]Thunderdome[/strike] Aussiefrogs, Nigeljo.

    Your 2 cents worth is exactly what I was thinking- either the filter, or possibly the pump.
    The measure of your character isn't what you do when people are watching- it's what you do when they aren't watching.

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    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by Hotrodelectric View Post
    Welcome to [strike]Thunderdome[/strike] Aussiefrogs, Nigeljo.

    Your 2 cents worth is exactly what I was thinking- either the filter, or possibly the pump.
    Dagnabbit, I guess not all HTML codes work here.
    The measure of your character isn't what you do when people are watching- it's what you do when they aren't watching.

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    Thanks hotrodelectricÖ but that was way before ecu's..and high pressure fuel pumps so I'm not sure if it still applies.. :-D

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    Quote Originally Posted by nigeljo View Post
    Hi.. I have a cx5 that has never given this problem but I used to have a 85 Nissan that would do the exact same thing.. The solution for the Nissan was to change the fuel filter.. Hope that helps
    I had a C5 that did something similar a while back. It had water in the fuel and I had to eventually empty and clean the tank as well as change the fuel filter.

    Just because the new cars are wall to wall electronics does not mean the same old problems as before do not turn up. I did not even use a scanner to find that problem. I changed the filter and as I always do shook the contents out into a bowl. When it mostly looks like water then you know you have a problem. It was still going but stopping and restarting.
    Jaahn

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    Fellow Frogger! Lasya's Avatar
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    Fuel filter check first?
    Gillian and Chris

    74 D Special, and now a 74 Pallas 23 5 speed with air(maybe). And now a Cactus!

    Oh, and a Holden.

    Lasya, Tibetan goddess of the moon and beauty who carries a mirror.

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    Tadpole Bruceg's Avatar
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    Sorry for the delayed reply Renault 12. You were right it was the fuse box and once replaced no more problems. Cheers.
    addo, SLC206 and renault12 like this.

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    Fellow Frogger! renault12's Avatar
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    Quote Originally Posted by Bruceg View Post
    Sorry for the delayed reply Renault 12. You were right it was the fuse box and once replaced no more problems. Cheers.
    Excellent! I just wish more people knew about this as a problem.

    I'm sure it would have saved many a C4 from a one way trip to the wrecker...


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