Vehicle & Technical > Defender

Fuel starvation?

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wellieboot:
Here's daft one to try (and you'll have to bear with me here).

Is the problem more apperent after you've just accelerated, backed off, then reapplied the throttle?

If it is, it's your oil that'll be the problem (no kidding!).

There is an unreported phenomenon knwon as 'hydraulic pump up'. It's caused by cunning combination of cheap oil and wear in the hydraulic lifters. It is readily cured by swapping the oil for some decent semi-synthetic oil. I have known people spend months tracking down non-existant, or irrelevant electrical maladies, replace entire ignition systems and play all kinds of games with ECUs, filters and fuel lines, just to find it the oil thats been the problem all along. Unfortunately, despite what some forums will have you beleive, cheap oil and Rover V8s don't mix.

I've been fortunate enough since this to befriend a gent who develops engines at M-Sport. His view is that oil is one of the most significant components in the engine. It would seem he isn't kidding, either!

I'm not saying this is your problem, unless the throttle on, throttle off, throttle on process makes it happen. But, you never know.

Hope any of this helps!

toodles
Boots

BigSi:
After an oil change, new plugs, new fuel filter, new leads, new dizy cap, new rotor arm, I’m starting to think that perhaps the problem lies with the ignition coil?

Had the mixture set from 0.6! to 3.0 just before the MOT, where its been running fine, but occasionally it will play up.

But its still doing its party trick where it will hesitate just after a gear change, looses revs when decelerating (and stalling when stopped), and not revving any higher when pedal is to the metal, just revs half way and sits there blipping!

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