2.7mpg, extreme poor running!!

dirtydiscov8 · Dec 16, 2012

As title, my 3.9 v8 Disco has just used over a quarter of a tank on a short drive.

Vehicle has steve heath fault code reader fitted and a mark adams tornado chip which means the engine management light actually works. But i got no fault code on the reader and no engine light on.

The exhaust tail pipe is wet inside with a black petrol smell and petrol seems to have got into the oil as that smells of petrol too and the oil pressure has dropped alot.

What could cause this, surely a failed cts wouldn't cause something this drastic...would it?!

TD5power · Dec 16, 2012

Ask dr_evil he knows all about v8's

sm0129 · Dec 16, 2012

Thought 27mpg was pretty good, then I saw the decimal point

lorri789 · Dec 16, 2012

Crikey!!!

Does the whole thing honk of petrol?

Dr_evil · Dec 16, 2012

TD5power said:
Ask dr_evil he knows all about v8's

You's just jealous of my garden ornament

juiceyv8 · Dec 16, 2012

I'd check you don't have a fuel leak!!

time76 · Dec 16, 2012

TD5power said:
Ask dr_evil he knows all about v8's

and his gets really good mpg :bolt:

Dr_evil · Dec 16, 2012

time76 said:
and his gets really good mpg :bolt:

I'll have you know it did 120 miles on a half litre of petrol

thats about as good as a blue motion polo

dirtydiscov8 · Dec 16, 2012

Ha, no fuel leaks but over a quarter of a tank in 12 miles is pretty special!

Seems like it's overfuelling so much its washing down past the rings and getting into the oil.

It would only do about 30mph flat out and was running really rough, it stalled at one point and only just re started after being jump started

Dr_evil · Dec 16, 2012

In that case your piston rings might be fecked if theres petrol in yer oil

dirtydiscov8 · Dec 16, 2012

lorri789 said:
Crikey!!!

Does the whole thing honk of petrol?

Nice use of the word Honk!, Yeah it's pretty smelly!

mark-d · Dec 16, 2012

maybe you should take your plugs out and see if its just one cylinder thats the problem.
maybe one injector is stuck open, if its possible i dont really know, more of a diesel man myself

lorri789 · Dec 16, 2012

Have you removed the plugs and checked what they look like?

dirtydiscov8 · Dec 16, 2012

Dr_evil said:
In that case your piston rings might be fecked if theres petrol in yer oil

Probably!!

Dr_evil · Dec 16, 2012

I'm predicting black and caked

dirtydiscov8 · Dec 16, 2012

lorri789 said:
Have you removed the plugs and checked what they look like?

I'll do it tomorrow but i'm thinking they may well looked pretty black!

lorri789 · Dec 16, 2012

ignition coil duff? Distributor cap and or ignition rotor fooked? Birds nest in the air intake?

fett · Dec 16, 2012

I would say it was in limp home, the lights are not that reliable.

Could be fuel or water temp sender

dirtydiscov8 · Dec 17, 2012

fett said:
I would say it was in limp home, the lights are not that reliable.

Could be fuel or water temp sender

My managemant does work properly, the mark adams fuel chip is set up to actually make it work, also the fault code reader says nothing but if i un plug the fuel temp sensor it shows the right fault code.

Would a faulty sensor cause it to over fuel this badly anyway? Seems like the injectors are stuck open and not pulsing at all by the amount of fuel it used.

put ht lead testers on it and they falsh away nicely, all the ignition is mallory electronic and about 6 months old and all seems ok

dirtydiscov8 · Dec 17, 2012

lorri789 said:
ignition coil duff? Distributor cap and or ignition rotor fooked? Birds nest in the air intake?

All seem good and even if it was a faulty ignition compnent i'd still be worried that it decided to squirt 20 litres of petrol through in 12 miles!

2.7mpg, extreme poor running!!

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