Technical > Engine and Transmission

G40 running problems

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pinky:
Hey Guys,

Just following on my thread from CP really I thought it would be better to post it here. I had problems with my G idleing all over the place, poor fuel consumption and it keeps bucking at low speeds (which must look funny from the outside but it's really annoying in traffic)

Following andys and yoofs advice I changed the blue temp sender and the lamba probe which has helped but its still doing the same things. I really need to give it a good service but before I do that is there anything I shoudl specifically look at? Its fine on boost and pulls hard throughout the gears, when I slow down for traffic lights or sitting in traffic it will cut out or nearly cut out or just die completely. I have noticed the battery light will flash when its idleing badly so it maybe a electrical problem but this would be a stab in the dark. Im not sure if it is because my rear seats are stripped out but the fuel pump is really quite loud but im not sure if this is normal?

Any help appreciated! it would be nice to having it running properly before the summer fingers crossed

Andy:
Is the ignition timing set correctly?
Have you stuck a meter on the battery to see what the voltage is with the engine running?
What's the CO pot resistance set to?

PeteG40:
following andy - it could be alternator thats duff from the battery light and poor idle - you need to measure voltage across the battery

pinky:
I am not sure about the ignition timing, I haven't checked the battery but I can do that this weekend. I think Marshall set the CO pot resistance slightly higher to even it out a bit but I maybe wrong another thing I will have a look at.

Thanks for the suggestions guys

EDIT : Another thing it doesn't do it in the morning till it warms up but I imagine if the alternator isn't charging correctly it will be pulling power from the battery so that might explain but I will check with the multimeter

Andy:
It's hard to say what's going on - the battery light might just be coming on because the car's on the verge of stalling, so the alternator is dropping in and out.

The fact that it's okay when cold might be because the auxiliary air valve (what people call the ISV) is open, giving higher idle speed. The ECU controls idle by varying the ignition timing, so if the base timing is out (or you've got a spastic map in the car) the car might not idle.

It's also worth checking the closed throttle switch on the throttle body is working properly.

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