amiga500:

 

Thanks for all the comments guys.  My reference to supermarket fuels was about Britain & not NZ.

 

As for the injector cleaner I used on my previous car I think it was Wynns. The car was a Laser with the 1.6 DOHC engine.

 

After reading the comments I am now wondering if I had something else wrong such as fouled spark plugs caused by a lot of round town driving.  The car would start mis-firing when under load at low revs.  After a few days I would get the tank next to empty go and buy the injector cleaner and a full tank of petrol. 

 

After that I'd go for a nice long drive some of it in 3 rd gear & plenty of revs and it did seem to work.   Maybe it had nothing to do with fouled injectors though. A day or so later the problem had almost completely disappeared but would come back after a few months.

 

P.S. And yes, I did change the plugs from time to time!

 

Hi Mick, You answered your own question!! (After that I'd go for a nice long drive some of it in 3 rd gear & plenty of revs and it did seem to work.   Maybe it had nothing to do with fouled injectors though. A day or so later the problem had almost completely disappeared but would come back after a few months.)

The reason being that after a few months of town driving the vehicle develops carbon around the inlet valves and injectors. This is what a good run, even better open road driving does, the present 91 Octane fuel will then clean out and GOOD engine temperature.....Normal running temps will clean out the carbon.

My suggestion would be to run the tank as low as possible and then fill the tank with 95 or 98 Octane fuel(once every +/-2 months)....take the vehicle out on the open road, within legal limits drive the vehicle hard as possible, to clean out the excess carbon. The detergents in the higher octane are more effective with the high levels of lead lubricates.

regards....