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Thread: Must push Accelerator when car is warm to start. Why??

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    Default Must push Accelerator when car is warm to start. Why??

    When the car is warm, i have to push the accelerator to get it start. It struggles but starts.

    Once started i have to keep the revs high for a few minutes untill there is a slight change in the car and then i can let the revs drop. Once the revs drop the car runs perfect. Idels perfect also.

    The car seems to start perfectly when cold and first time also.

    No engine lights are showing either.

    Any idea what is causing this?

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    Regular Member SlowCoach's Avatar
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    Vehicle : SRI 150

    Trim : Smart and Bad!

    Engine : Z19DTH

    Year : 2008

    Mileage : 105000

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    Get codes read.

    Fuel filter changed? Checked all connectors all fitted? What engine/spec etc

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    Hi,

    There are no codes. the car is a 2003 vectra c 1.8 16. I have released the pressure in the fuel pipe and there was plenty that came out. Car also started ok after this test.

    connectors seem to be ok also. could this be linked with the engine coolant temp sensor located beside the thermistat?

    i have changed MAF, Oxygen sensor after cat, cleaned teh throttle body. EGR valve replaced not that long ago. Spart plugs cleaned.

    any help would be great.

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    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    Injectors staying open

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    So its fine from cold with no issue? , but when started after warm it fails to fire straight away?

    Hmm , I'm guessing air is entering the fuel system some where before the injection pump, and that this is only when left with warm/hot fuel in the lines.

    Does the CDTI have an electric lift pump?

    This is only a huntch

    Edit , injector sounds more likely.
    Last edited by mon; 8th November 2012 at 00:13.

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    how can i check for this? does that not mean the car is getting to much fuel then?

    Urm the car is unleaded. I think it does have an electric lift pump though. yea the probly only accurs when the car is warm. It trys to turn over a few times and then starts and i must keep revs high for a few mins then everything ok. If i dont it stalls, or lack of power and then stalls.

    Thanks

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    Quote Originally Posted by Tank988 View Post
    how can i check for this? does that not mean the car is getting to much fuel then?

    Thanks
    The injectors will not be sticking open all the time or you would be calling the car smoky Joe... lol

    If the injectors stick open when the engine is turned off, the fuel would drain into the cylinder and leave air in the high pressure injection pipes, this needs to be cleared and filled with fuel before the engine will fire, holding the accelerator down will open the injectors for longer and inject more fuel, or in this case purge more air from the lines , until fuel gets to the injector and she fires.

    I'm just wondering why this wouldn't happen when cold after being left overnight..?
    Last edited by mon; 8th November 2012 at 00:16.

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    Over night is the best. ant had any problems starting the car at all when cold. (i did for a while have problems starting the car in genral with it misifring etc but i replaced MAF, o2 sensor cleaned throttle body) and now im left with this problem just.

    Is there an easy way to check the injectors to make sure they are clean and working??? maybe worth a cheack if its easy done??

    Thanks Guys

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    If I were you;
    1) I would run through some injector cleaner for the cost of it, might de coke an injector.
    2) Then change the fuel filter, If the filter is clogged it can be easier to suck air into the injection pump than pull fuel through a dirty filter.
    3) Get injectors tested by a specialist.

    Thinking on I reckon the fuel filter! , hot fuel is allot thinner than cold fuel and so its easier to get air leaks on the vacuum side of the fuel lines.. generally between the fuel filter and the injection pump as this will be the greatest vacuum especially so if the filter is clogged.

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