filled up at BP now running crap

[Gazza2005au]

filled up me VN at a BP servo got a little confused as there was 3 types of unleaded so i used regular unleaded 91 octain car felt a little rough about 15mins drive along high way than about 45mins later the car started to jerk it would only jerk when i was steady on the throttle going up hills the car would run fine going down hills the car would gently rock back and forth like the motor was cutting out than back in etc so i finally got home and stopped at a few light the car would bairly rev it was really rough when i could get it to rev it was splattering alot but once the car got moving it was ok this problem happens both in gear and in netural weird thing is the car never stalled
anyone know what is wrong? i just got the car registered today to and have owned it for over 6 years

[1991_Vn2nV]

What fuel do you normally run it?

Give BP Ultimate a go, the 98 octane.

But maybe its your fuel filter... Do you nomally run it right down before you refill? If so you filter is probably full of crap.

[Full Spectrum]

My car does that with different fuel company's it's nuts.
This car used to run on what ever the old owner was close too. But since i have got it it runs on Caltex as BP ran sick Shell real crap Caltex seems to like it so i stay with it. 91-98 oct all good.

Gazza any-chance you changed something in the past week? Fuel reg oxygen sensor?

[burnz]

sounds like water in the fuel
siphen some fuel off the bottom of the tank and check

[Emackulation]

If there is some water in the tank, add some household metholated spirits. The metho will mix with the water and run through the engine. Hence getting rid of the water from the tank...

[dinodog]

i run my vr 5.0.ss on bp 98 only and it makes more power then the 91 crap thats out there. when i first put the 98 in car did run a bit rough for a time but was told to take batt out and let sit for an hour so computer resets itself. did this and no problems now runs like a dream,would not go back any other fuel now as this make my ride run heaps better...

[Full Spectrum]

Funny story i filled with 98oct about 8 weeks ago ran it thought then went back to 91oct i got a boost in performance when i went back to 91oct.
It maybe cleaned everything out good idea once a month.

[mouce]

Actually, normally when running 98RON fuel the ECU advances the timing a little bit, and you do get a bit of a boost in power. Upon switching back to the 91RON fuel, and while the computer is still running the advanced timing, you end up with more power again for some reason. Over time though the computer eases the timing back to where it was.

Don't get me wrong it does clean things out, but the advance in timing has a fair bit to do with it too.

[anton1o]

Yeah i try and do the whole 1 month of consistent BP Ulimate and then the normal unleaded.. For a few months, then go again with Ulimate..

Now that petrol has dropped much lower, and you can get Ulimated for $1.25 - $1.30 I try and fill up for much longer and stay on Ultimate
I dont really notice the gain at all, but eh i just threw the exaust on yesterday so ill see how she goes once i really get the car sucking down Pure Ultimate

[mouce]

I've found that running a good 98RON fuel is cheaper than using 91RON when worked out in cents per kilometer driven. Sure, cents per litre is a bit higher, but I've found that in my car running Optimax (now known as V-Power) I go further per L of fuel used, enough to make a saving anyway.

[Full Spectrum]

Actually, normally when running 98RON fuel the ECU advances the timing a little bit, and you do get a bit of a boost in power. Upon switching back to the 91RON fuel, and while the computer is still running the advanced timing, you end up with more power again for some reason. Over time though the computer eases the timing back to where it was.

Don't get me wrong it does clean things out, but the advance in timing has a fair bit to do with it too.

Ah so that's what it was. Good idea once a month When it's cheap.

[greenfoam]

The VN ecu doesn't advance the timing for 98 octane it's set what it's set on an that's it. The guy said hes had the car 6 years but just got it registered, the tanks probably sludged out or a few drops of water in it. I reckon replace the fuel filter for a start

[Full Spectrum]

My car was sitting for 12 months before i bought it. 6 years

[dinodog]

hi there i was told in another thread to take battery and eng fuse out when changing over fuels, i did this when going from bp91 too bp98 . it did play around a bit till computer reset itself but after that she run sweeter than a pitbull on heat!! but also dont use shell fuel so ive read on these threads.

[richie_cky]

So...which companies make bad fuel? And which make good fuel?
I though Shell and BP would be pretty good...?

[holden007]

Still Shell, BP, Caltex, Mobil and Ampol are the way to go, they are big companies and I doubt they will make bad fuel. Ill be watching for the little stations out there.

I recommend BP Ultimate and Mobil Snergy, I reckon there better then Vortex 98 and Optimax.

For 91RON, doesnt really matter whether its Shell, BP, etc.

[Shanoqueeb]

u might have got some bad fuel or they added some ethanol to the petrol.

[anton1o]

hi there i was told in another thread to take battery and eng fuse out when changing over fuels, i did this when going from bp91 too bp98 . it did play around a bit till computer reset itself but after that she run sweeter than a pitbull on heat!! but also dont use shell fuel so ive read on these threads.

Can anybody confirm having to do this, Or needing to do them both?

[mouce]

The VN ecu doesn't advance the timing for 98 octane it's set what it's set on an that's it. The guy said hes had the car 6 years but just got it registered, the tanks probably sludged out or a few drops of water in it. I reckon replace the fuel filter for a start

Oh...okay. Cheers Foamy, live and learn.

And yeah, since the car has been sitting for 6 years, the tank probably should be cleaned.

[Keesh]

my cars done this as well! i dunno what been going on but i was driving along and all of a sudden it was firing like it was out of petrol! its sounding like a sigma and has no power AT ALL but hasnt stalled on me, i usually use regualar unleaded from both bp and shell but im thinking that ive use a bad batch maybe

[Gazza2005au]

sorry fellas i didnt get any instant reply notifications for some reason today the car has been with the auto electrician for its 3rd day! first day he couldnt find the problem second day he left the car running for 1 hour before it heated up than started the stalling affect now he is working on it again today he thinks it could be fuel pump,fuel regulator or the fuel pump wiring but after reading the link below im thinking my problem is the ECU Temperature sender unit as the car will run perfectly normal untill my temprature guage reaches the same point than without a fail the problem kicks in from no where the auto electrician said "it sounds like its cutting out but takes 1 hour of idle or to reach the same temprature point to do so" as said before it only does this when the temprature reaches the first white line i have the thermostat removed and had the auto electrician install a adjustable thermo fan controller so temps stay nice and low