All Things Mk5 > Mk5 General Area

Starting

<< < (2/3) > >>

brian_badonde:
I had the same issue for a while. Replacing the fuel filter sorted it. As the chap above said, when you open the driver's door or turn the key to position 2, you should hear the lpfp priming. Before I replaced the filter, I found priming the pump a couple of times always made it start on the first turn of the key so that I wasn't constantly cranking the starter and draining the battery.

mjmallia:
The HPFP is a mechanical one, so needs the engine turning over to create the desired pressure....so the initial second or two it will feel a little lumpy until the engine has started......especially in the cold as fuel is obviously more combustible when hot.

Some say the LPFP can be a bit tired if the cranking goes on a little longer.

Panthera:
I had the Cam follower done when I had the injectors and carbon clean.  What I can’t work out, why did it started fine before this work, but now it struggles. 

My original problem was at the beginning of the year with all of the old weather and just doing short journeys to work (10miles) my car was not cold starting properly - instead of idling at 1100-1200 it was 1000 rpm or Lower. Also I noticed it sounded rough - like misfiring. 

I booked the car into a VW main dealer ( opposite where I work and they found after keeping the car over night that that cylinder 1 misfired at 1000rpm and cylinder 2 at 1500-2000rpm when cold. Then when they retested it, it was fine.

And said I would need to replace injectors, coils and walnut clean. But did not advise doing any further work just yet. So I contacted the VAG specialist that I use for servicing and they said injectors and carbon clean.

The car now when started is fine, I just now have this problem. The few days after I had this work done the car struggled to start, but now even after 2.5 days of not being used it’s better, not not 100%.

  There is an Audi able hum when I open the drivers door. Not tried ignition 2 though and listened?

Would Vagcom display the values of the lpfp?

colesey:

--- Quote from: brian_badonde on April 07, 2021, 08:37:51 am ---I had the same issue for a while. Replacing the fuel filter sorted it. As the chap above said, when you open the driver's door or turn the key to position 2, you should hear the lpfp priming. Before I replaced the filter, I found priming the pump a couple of times always made it start on the first turn of the key so that I wasn't constantly cranking the starter and draining the battery.

--- End quote ---

I, too, would recommend replacing the fuel filter with a new 6.6bar one.  It's a slightly off the radar part and pretty cheap.  Brian, thanks for evoking memories of starting my caterham!

GreigC:
Your issue is the fuel pump (inside the tank) when you start the car it does not have enough PSI to start the car it splutters. If you turn it off and on again it will most likely start first time and run perfectly fine. When the car is left again the pressure drops in the return line causing rough start up.

Navigation

[0] Message Index

[#] Next page

[*] Previous page