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missfire

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STEVE AXWORTHY:
hi im having trouble with my early v8 i when you drive first off everything is fine it runs like a dream then when you have done around 10-15 miles it starts to miss fire gradualy getting worse and if you try to accelerate it feels very jumppy i have had new plugs/leads and cap recently but problem still same, i feel it may be fuel related any suggestions much apreciated

lee celtic:
Has it got an auto choke??

could be stuck which is ok when it needs it (starting) but will over fuel when warm...

I had the same problem on a old mk2 transit after fitting a manual choke it was fine....

Range Rover Blues:
What carbs have you got? sounds like the old SUs when the damper oil was running out.  They work fine with just a littl eoil, they work fine full (over full) of oil but as the excess oil starts to become consumed they are terrible.

STEVE AXWORTHY:
forgot to add its an efi

Eeyore:
We had a similar problem on the racer (also a 3.9 efi) and it took us months to find what was causing the problem. In our case we found (and I kid you not) that using a better quality engine oil cured the problem. What we were experiencing was a pumping-up of the hydraulic lifters (which stops the valves doing their thing properly). It doesn't take a lot of wear in the cam-train to inititate pump up, but instead of changing the cam and rockers etc etc, chaning the oil eeks the parts out for a good while longer.

Not saying it's whats causing your problem, but you never know!

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