Thread: Running rough after refill r

Originally Posted by Tressy_C

Shell 91 octane, just seems pretty strange that it was the only thing that changed yesterday. Before the fuel ran fine, after fuel running like a bag of snot

Originally Posted by Pedro_The_Swift

Is that whats on the filler flap?
mine says Premium.......

The car apparently has the smarts to accommodate 91 octane fuel.

Knock Sensor and Fuel.JPG

There are also other references regarding compensation for fuel quality. e.g living in remote places.

I have used ethanol without problems but it was 94 octane. Was not economical to use premium and I was in the low end of consumption (16-17 litres/100 city driving).

Thanks for all your input, I think it’s dirty fuel. I have put a good fuel cleaner in the car today and will add metho tonight and seee how it goes from there.

Don't bother with the metho. Today's modern 'manufactured' metho doesn't absorb water, bloody useless. Doesn't taste as good either whether mixed with beetroot juice or orange juice it tastes crap
Try it out (no, not drinking it), put some water in a jar add metho and give it a good shake.

Assuming the anti knock sensor is working OK the engine should run alright on 91 octane though not as well as on 95/98 octane.

Chance is the servo had just got a load of fuel delivered and stirred up all the crap in the bottom of the tank, there wasn't a tanker unloading when you re-fueled was there ?

Deano

Originally Posted by DeanoH

Don't bother with the metho. Today's modern 'manufactured' metho doesn't absorb water, bloody useless. Doesn't taste as good either whether mixed with beetroot juice or orange juice it tastes crap
Try it out (no, not drinking it), put some water in a jar add metho and give it a good shake.

Assuming the anti knock sensor is working OK the engine should run alright on 91 octane though not as well as on 95/98 octane.

Chance is the servo had just got a load of fuel delivered and stirred up all the crap in the bottom of the tank, there wasn't a tanker unloading when you re-fueled was there ?

Deano

no there wasn’t. I pretty confident it’s a fuel issue as the car still drives ok just very lumpy like it has a spark issue/injector not firing. Hopefully a fresh tank of fuel will sort it out. I know when I filled up yesterday my reserve light was on so might have been some crap in my tank and/or the servo fuel

Try topping up with 98 and 'shandy' the mix might help. Unfortunately the V8 D2 doesn't have a fuel filter (unless there's an internal one in the tank) so I don't know how you get rid of crap in the fuel delivery system ?

If the anti knock sensor was not operating correctly and the EMS was 'stuck' on a setting for 98 octane when run on 91 octane the engine would presumably 'ping', something I've not experienced since the demise of carby/distributor non EFI vehicles many years ago. It feels sort of like a 'rattle' under load/acceleration is the best description I can give.

Deano

The idea of using the "old" meths was that it mixed & made a "brine" out of the moisture, this then allowed it to pass through the fuel system & burn in the cylinder. Sound like "new Meths" won't do that.

As an aside, we of the Fridgie fraternity used Methanol to rinse out TEVs in refrigeration systems to mix with & allow moisture to move through. Sometimes we would need to give the system a measured dose which would be left in permanently. but not too much, & I can't remember the dosage rate for fridges, not that it is of concern here. Too much was thought to remove the motor winding varnish on a sealed unit. Dunno, that was the theory at the time.

Moisture always found it's way & froze at the TEV expansion point/orifice, blocking it, meaning no refrigeration was happening.

Now & then when caught short, so to speak, TEVs were rinsed out with "old Meths
but I never left a measured dose in the system, but provided you removed the moisture & a new Filter Drier was fitted the job was usually satisfactory.

Unfortunately the V8 D2 doesn't have a fuel filter (unless there's an internal one in the tank) so I don't know how you get rid of crap in the fuel delivery system ?

The D1.5 V8 had a fuel filter located in a bit of a bastard of a place, bolted to the chassis at the top of the Rear Driver's side wheel arch, usually hidden from view unless you know what you are looking for. Special connection fittings I recall. Remove the wheel for access.

There was/is a "roughing filter" at the pump in the tank to catch big **** but if it is small enough to get past that one, the wheel arch job should catch it.

Right, what was the question?

Have you ever been,
On the kerosene,
When the metho's running low