Vehicle & Technical > Discovery

mis firing v8 yes i know. last update

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Eeyore:
Hmm, shift the plugs about as you suggest and check the condition of each it too - this should tell us if it's trying to run lean, rich, drowned in fuel, falling to pieces etc. All usefull stuff.

Ok, we know engines need four things to make 'em fire: fuel, spark, compression and air. If we can eliminate each one, we could find an answer. Or not........ <ahem>

If it's failing to fire on gas as well as petrol I think we can count injectors out. So as you say check the spark plug. If that seems to be working, it might be an induction problem. This might point to worn / gnarled lifters or cams for the cylinder, causing a lack of air or air/lpg depending on running conditions (which will stop it firing - there is a fairly tight tolerance on the air/fuel mixture). If that can be eliminated then it's time to look at a compression test to see if it's bleeding out somewhere.

Is it seeming to burn oil?

If it was slightly more intermittant, I would have said change to a better oil. But it isn't, so I won't.  :wink:

Hope some of this helps!

cheers
 8)
Eeyore

gtomo2:
Thanks for that eeyore. will go back out in to the thick fog and see if i can find my car first. i know i left it in the drive but i cant see any further than the outside of the window were did this fog come from or have my cataracks? come away  :roll:  :(bigshock):

dazzawhipple:
might be a sticky valve

As its been said move the spark plugs around


Darren

Eeyore:

--- Quote from: "dazzawhipple" ---might be a sticky valve

--- End quote ---


Absolutely! Should have added that one to the induction list. Well spotted, that man.  :wink:

Should be spottable with the rocker off.

cheers
 8)
Eeyore
(also looking for his wagon, in the carpark, in the fog!)

karlo:
Graeme, I have a doofer you put between the lead and plug and you can see it sparking works better in the dark though, only got the one so you'll have to do it one at a time!

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