V8 and tesco's petrol

[ukmudmaster]

my 3.9 EFI goes like a train, acceleration is great, steady cruise at 80, no problem, but......... at a steady 50-60 it holds back as if starved of fuel. I did fill up with Tesco,s unleaded, but the garage assures me their petrol is unaffected.
Any idea's ???
Dave

[Thrasher]

Filled mine with Tesco fuel - still pulls like a train, and goes like stink. Not sure the V8's are so affected by the issue - was mostly french cars and vauxhalls?

[Range Rover Blues]

What year is the car?

[iain]

I've had problems after filling up at tesco, hesitation on gentle acceleration and some stuttering and hesitation while crusing at various speeds. However its not a consistant thing, just hope its a clogged fuel filter!

[fudge]

From our garage experience, here we've changed 23 Lambda Sensors (Oxygen Sensors), and it appears that that is the component mostly affected, 15 of these are were on smart cars (we're a smart specialist)....

If your car has a sensor (i doubt) remove it, clean it with brake & clutch cleaner and some wire wool and try inserting it, we've done this to one of our cars and its ok so far....

I'm loving the fuel problem..... I have about 35 gallons of fuel that should run fine in Godzuki and my mower.... Free Laning, offroading and mowing for the next few years! :lol:

More silicone please! our best one is the bloke who's car we drained, sorted the sensor and put £ 5 of "clean" juice into just for his missus to refill at TESCO and need recovery on her way home.... apparently Tescos will be charged for her Ice Cream! :? too.

[stephen badland]

v8s like the higher octaine fuel if you can aford it

[ukmudmaster]

It.s a 3.9, 1989 EFI vogue, if that helps
Dave

[Difflock]

Dave,as has been said try running it on super unleaded,expensive I know but worth a try,My bike goes like the wind on the stuff but seems to hesitate now and again on normal,but then again I can tank her up for £11   :oops:  :oops:

[ukmudmaster]

Yeah, a few people I spoke to said the same, the good ( ???) thing is , it won't take long to use this tankfull!

[rangeyv8]

just filled my V8 up £70 squids with the high octane makes loads a differance like driving different car, can,t keep using it thou far to dear

[ukmudmaster]

RangeyV8, I see you are in Collier Row, if you are interested in a local Land Rover club, Brentwood LROC is a friendly, small club thatmeets on a tuesday night at the Tower Arms, South Weald, Brentwood, around 8pm. We have a pint and a chat, some evening greenlaning locally and some weekends, some not so local.
Dave

[Range Rover Blues]

It.s a 3.9, 1989 EFI vogue, if that helps
Dave

Shouldn't have Lambdas then.  The later V8s were tuned for 95 RON octane, so I'm suspicious that super unleaded will make a great difference without re-tuning ie timing, but it's possible it does burn better :?

If you use super then set the 3.9 dizzy to 6 deg IIRC, 4 deg for a cat equiped vehicle which has a different TSR on the EFi loom so slightly different fueling.

[ukmudmaster]

Thanks for that, will have a go at it this week,
Dave

[Difflock]

Dave,as has been said try running it on super unleaded,expensive I know but worth a try,My bike goes like the wind on the stuff but seems to hesitate now and again on normal,but then again I can tank her up for £11   :oops:  :oops:

Ere,just tanked the bike up again on super,Ere make that £15.50  :oops:  :oops:

The flame burn speed on super is much better than regular and I think its rated at 98/99 RON hence the possible "NEW" engine feel

[iain]

You could check the spark plug leads, i done this last night when it was dark. I could see two leads arking onto the engine. So i hope thats all that will be causing the stuttering. And as for tesco petrol, i was shopping in tesco yesterday, talking to the checkout staff, they said that they wouldnt use tesco petrol!  :shock: