getting some engine judder - G40 playing up

[goosyganger]

Old? I have owned the for 2 years. They were In my previous car and I don't know if they were ever changed. Saying that the sender unit is no longer reading the correct fuel level. It seems to be stuck on one level.

[hardchargin40]

With your car started, disconnect your blue CTS plug.  Take it for a drive, should rule out sensors.


No blockage or restriction in the fuel system? new or old fuel filter?  There's a way of checking out your fuel pump by putting 12v onto it, there's a guide somewhere (poss club polo forum) but doubt that would indicate anything other than they work unless it sounded strained.

A garage can check fuel pressure on the end of the fuel rail.

[goosyganger]

Cool, I'll take it for a drive with the blue temp disconnected.

Well I'm running the pump/filter/ swirl pot in the boot. But will check for any blockages. The fuel filter is new. And all the fuel lines at the rear end are new. The only original ones are the long ones that go under the car.

I will try and pop into a garage later to have the fuel pressure tested. See what they say.

[Andy]

Running with the blue temp sender disconnected doesn't rule out all sensors... When you get your fuel pressure checked, see if they can fit a gauge and let you go for a drive, if you've got a weak pump it'll be struggling most when you first mash the pedal.

Remember that the fuel pressure reg is 3bar or 45psi relative to your manifold pressure. That means on 1bar of boost you'll expect to see 4bar on a gauge, and likewise under vacuum that gauge will read less than 3bar.

[goosyganger]

Thanks Andy I'll try to get it checked like that. Should be someone around here that has something like that. It's hard to fin people who know about modified cars around here lol.

Stupid question but could low oil level spur such a problem?? Or a boost leak???

[Turbodaily]

^ omg nik! i cant beleive you said that!

[goosyganger]

Lol which part? If you mean that part about people knowing about modified cars then I meant garages lol because Andy said about getting fuel pressure checked at a garage, used the wrong phrase. But out of the population of west London you and Cy are the only people that I know that know about modified cars, I've just been lucky to meet you lol.

[jimmyb1982]

My G40s just been doing this tonight. Mine needs timing properly as the timing is out of whack. Its the first time i've driven it in the cold weather. Do you think it could be to do with the timing. Its set so it doesn't lean out but I've been told that this isn't neccessarily right?

- Jimmy

[joaquimxp]

hi i have had the same problem with my g i have trying to get to the bottom this for some time and finaly its a 2mins d.i.y job.. i had the thottle position plug conected to the knock senser plug after a swop it was ran great.. sorry about my bad english