Warning POSSIBLE Tesco 99 Poor fuel problem
Discussion
Could be that you ran the tank very low before filling up? If this happened the pump will have picked up all the crud from the bottom of the tank. A partially blocked fuel pump or fuel filter will act like a rev limiter if there is insufficient fuel pressure, similar to most car's limp home mode. Check the fuel pressure. Hope that helps.
clarkey318is said:
Could be that you ran the tank very low before filling up? If this happened the pump will have picked up all the crud from the bottom of the tank. A partially blocked fuel pump or fuel filter will act like a rev limiter if there is insufficient fuel pressure, similar to most car's limp home mode. Check the fuel pressure. Hope that helps.
The fuel pump already takes fuel from the lowest point in the tank, and his tank will be quite new and made of plastic so its unlikely to have any crud in it at all.
at 1.2 litre turbo giving a flying fI have read this and come up with the same conclusion as most have, your car is just being unhappy
-Limp home mode will register a fault, even my car which is 14 years old knows when something is wrong and flags up a fault code, everything is pretty much fault coded these days, mine tells me when the pressure in the rear tyres are low or out of balance.
-97-99ron or super fuel in a 1.2 not mapped to run it is just throwing money down the drain, as the car wont take a blind bit of difference to it, it just registers fuel.... Take my car for example, run that for a week on super and tell me how it goes, then run it on 95 for a week and tell me how bad it runs, my car has a knock sensor and is mapped to run on 100 ron fuel, it will tell the difference between 95 and super.
Now a mass produced Clio sold in the UK and on the continent where most countries run 95, the car will be mapped to run on 95 and be happy on 95 ron, my car is a Jap only car where they have 100 ron fuel(lucky f
kers) being a JDM car it is only mapped to run on 100 ron, any other fuel it throws its toys out the pram.
Your Clio wont care, Renault want to sell as many of them as they can, now base that on who will buy them and then run on them on expensive fuel, if some people were looking for a small car and Renault said that this car runs best on super it would put people off, I have seen people refuse to put fuel in when super is only available, thats why car manafacturers map their cars to run on the low grade fuel
Most fuel tanks feed from the bottom these days so the chance of "sucking any crap into the engine" is unlikely as
A. The fuel is refined so shouldn't contain any crap
B. Has a fuel filter
C. Crap would probably block an injector and the ecu would note this
D. Fuel is taken from the lowest point of a plastic tank these days
Now on a slightly more helpful point I have heard a few times once of an AA blokey who had to reset an ECU on a Clio with his computer machine that the French dont really test their cars in adverse weather conditions and sometimes in the cold or the heat the ECU can get a bit funny, which is what I have seen happen on a very hot day once, woman parked her car all day in the sun (a Clio) came back, opened the door key in ignition stereo came on, would not turn over... AA turned up, had to reset the ECU as it had just got to warm and put itself into a failsafe mode
Either way I dont think its the fuel
-Limp home mode will register a fault, even my car which is 14 years old knows when something is wrong and flags up a fault code, everything is pretty much fault coded these days, mine tells me when the pressure in the rear tyres are low or out of balance.
-97-99ron or super fuel in a 1.2 not mapped to run it is just throwing money down the drain, as the car wont take a blind bit of difference to it, it just registers fuel.... Take my car for example, run that for a week on super and tell me how it goes, then run it on 95 for a week and tell me how bad it runs, my car has a knock sensor and is mapped to run on 100 ron fuel, it will tell the difference between 95 and super.
Now a mass produced Clio sold in the UK and on the continent where most countries run 95, the car will be mapped to run on 95 and be happy on 95 ron, my car is a Jap only car where they have 100 ron fuel(lucky f
kers) being a JDM car it is only mapped to run on 100 ron, any other fuel it throws its toys out the pram. Your Clio wont care, Renault want to sell as many of them as they can, now base that on who will buy them and then run on them on expensive fuel, if some people were looking for a small car and Renault said that this car runs best on super it would put people off, I have seen people refuse to put fuel in when super is only available, thats why car manafacturers map their cars to run on the low grade fuel
Most fuel tanks feed from the bottom these days so the chance of "sucking any crap into the engine" is unlikely as
A. The fuel is refined so shouldn't contain any crap
B. Has a fuel filter
C. Crap would probably block an injector and the ecu would note this
D. Fuel is taken from the lowest point of a plastic tank these days
Now on a slightly more helpful point I have heard a few times once of an AA blokey who had to reset an ECU on a Clio with his computer machine that the French dont really test their cars in adverse weather conditions and sometimes in the cold or the heat the ECU can get a bit funny, which is what I have seen happen on a very hot day once, woman parked her car all day in the sun (a Clio) came back, opened the door key in ignition stereo came on, would not turn over... AA turned up, had to reset the ECU as it had just got to warm and put itself into a failsafe mode
Either way I dont think its the fuel
EDLT said:
clarkey318is said:
Could be that you ran the tank very low before filling up? If this happened the pump will have picked up all the crud from the bottom of the tank. A partially blocked fuel pump or fuel filter will act like a rev limiter if there is insufficient fuel pressure, similar to most car's limp home mode. Check the fuel pressure. Hope that helps.
The fuel pump already takes fuel from the lowest point in the tank, and his tank will be quite new and made of plastic so its unlikely to have any crud in it at all.I've had nothing but excellent experience with Tesco 99, especially since it is often cheaper than texaco etc's normal octane fuel.
You might want to try some injector cleaner anyway it never hurts anything...
Andyuk911 said:
Just a heads up but I am 99% sure Tesco have a problem with the 99 Fuel.
I filled the wife's 2008 Renault 1.2 TCE from almost empty, and after 20 miles the car went into limp mode.
I have had it checked, and no faults are found.
Car is now running rough on tickover and lacks power, I assume the ECU has backed everything off.
I am certain the problem is the Super unleaded bought from Tesco Sidcup and no faults with the car.
Sorry if I am repeating anything.I filled the wife's 2008 Renault 1.2 TCE from almost empty, and after 20 miles the car went into limp mode.
I have had it checked, and no faults are found.
Car is now running rough on tickover and lacks power, I assume the ECU has backed everything off.
I am certain the problem is the Super unleaded bought from Tesco Sidcup and no faults with the car.
When you had it checked did you take it to a main dealer as I doubt an indi would have the up to date code readers that would show all faults.
As for it feeling better on Tesco 99, that's rubbish, you're more likely to feel an improvement in performance on a cold or wet day when the air is denser, I'd save the 5 or 10p per litre and use the cheap stuff and as has been said earlier it all comes from the same tap at the storage depot except with 99 a man stands on the tanker and pours in a bottle of octane booster
If the car isn't that old I'd be taking it back to Renault under warranty and not mentioning petrol to them at this stage.
Andyuk911 said:
I understand the thoughts you are all having.
The car since new has run 'sweet'
Obviously the only way to prove this is to sample the fuel ..
The 20 miles was approx.
I will try and run the tank out dry and switch to shell ... I can then only report back if the car returns to it's normal performance.
I still feel if you plan to use Tesco 99, play it safe for now .......
If the car had any problems I am sure they would have fixed it .... they suggest it is the fuel too
IMO you are creating a crisis out of a minor drama. IF there is a problem with the fuel then it will be your local filling station, not nationally. Otherwise they would have been more of a problem nationwide. Why not call the garage and ask them?The car since new has run 'sweet'
Obviously the only way to prove this is to sample the fuel ..
The 20 miles was approx.
I will try and run the tank out dry and switch to shell ... I can then only report back if the car returns to it's normal performance.
I still feel if you plan to use Tesco 99, play it safe for now .......
If the car had any problems I am sure they would have fixed it .... they suggest it is the fuel too
Edited by Targarama on Sunday 29th November 10:09
I used a local B# station to fill up my BMW 740i and my Wifes Merc A class.
I drove to work the following day (240 miles) and my car felt under powered, and lethargic. The fuel consumption had dropped to 22 mpg, as opposed to a normal 30mpg. No warning lights on the the dash.
On speaking to my wife later the next day, she said her car had no power.
Both cars would have been pretty close to empty when i filled up.
I reported it to the BP station, and they said no one else had reported a issue. After we filled up again next time at a shell garage (V Power
),both cars recovered.
Did not think about it again until:
HTH
I drove to work the following day (240 miles) and my car felt under powered, and lethargic. The fuel consumption had dropped to 22 mpg, as opposed to a normal 30mpg. No warning lights on the the dash.
On speaking to my wife later the next day, she said her car had no power.
Both cars would have been pretty close to empty when i filled up.
I reported it to the BP station, and they said no one else had reported a issue. After we filled up again next time at a shell garage (V Power
),both cars recovered.Did not think about it again until:
- : 2 weeks later, the B# station closed down and had new tanks fitted.
- : At the next service of the BM, Fault codes for fuelling were logged on each bank of the V8, which were "probably" fuel related as each bank has it's own sensors.
HTH
PJR said:
Maybe Tesco's regular fuel is pulled from the same tank as other companies? But the 99 stuff is supposedly made by "Greenergy"
http://www.greenergy.com/tesco_99_octane/index.htm...
Correct; I've read the data sheets and Tesco 99 is a distinctly different fuel to Shell V-Power.http://www.greenergy.com/tesco_99_octane/index.htm...
Mafioso said:
NiceCupOfTea said:
Mafioso said:
Surely putting Super Unleaded into a 1.2 litre is the reason?
Why would put high octane fuel in a non-performance engine make any difference at all? If he put 95 in a 98 only spec engine then yes.ETA: Something to do with compression ratios?
Edited by Mafioso on Saturday 28th November 17:41
As I understand it, if a car has a map sensor then it can advance and retard the timing depending on what fuel is added. Again, if the car did not have this then it would be set up to run on 95 anyway, so the higher octane fuel would be run at standard timing which would cause no problems (as it would have excess anti-knock, rather than the other way round (set up for 99 running on 97) where it would have inadequate anti-knock).
ETA: Fifth Gear are showing their (alebit slightly older) fuel test n Dave at the moment, very topical
Edited by Twincharged on Sunday 29th November 11:57
I always use the higher octane stuff, even in my older cars, even though they don't have adaptive knock sensing etc (read no knock sensing) and there's no actual performance benefit in running higher octane fuel, they do provide more resistance to knock, which is good enough for me.
The other benefit of using these fuels in my older cars is the additive package which will result in a cleaner engine.
The other benefit of using these fuels in my older cars is the additive package which will result in a cleaner engine.
I once ran 98 ron in an old car i had as an experiment. several things happened.
Fuel economy went right down (low-mid twenties)
coolant temperature was reading lower than normal
fuel gauge do the following, suddenly (over 1 or 2 miles) drop by a quarter of a tank, and then over about 20 miles would raise by about an 8th of a tank and then work as normal till and 8th of a tank had been used then would repeat as above.
also my car would run 'limp' but that was due to a dodgy temperature sender.
Fuel economy went right down (low-mid twenties)
coolant temperature was reading lower than normal
fuel gauge do the following, suddenly (over 1 or 2 miles) drop by a quarter of a tank, and then over about 20 miles would raise by about an 8th of a tank and then work as normal till and 8th of a tank had been used then would repeat as above.
also my car would run 'limp' but that was due to a dodgy temperature sender.
kambites said:
TheEnd said:
Andyuk911 said:
kambites said:
Frankly, if your car goes into a "limp home" type mode without recording a fault, it's broken. No piece of electronics should actively enter a diagnostics mode without recording the reason. If the fuel was bad and there was nothing wrong with the car, it would have recorded that it was having some kind of combustion problem, probably a misfire or overheating or something.
No over heating or misfire .... Edited by kambites on Saturday 28th November 19:49
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