Safety boost question....

Hi all

Long post....(sorry)

Just been giving the ZX a good thrashing in Cornwall last week and experienced a temporary moment of safety boost. No problems at all on the m-way down last Saturday, the car felt responsive and eager (happily hit 145 in no time and cruised at a good 3 figure speed :rolleyes: ). It was fine the next day too. But on Monday, after an hour's drive in the 28 deg C heat it would only reach the 7psi mark on the guage and felt way down on power. (I had refilled at a BP garage the previous evening with 95ron u/l fuel as usual - UK car, so ok to use). I left the car for a few hours and it was fine for the drive back to my hotel. It was OK the next morning too, but after a hour's drive safety boost reared its head again.

I ran the tank down to 1/4 and refilled with Optimax and all was well. In fact I used optimax the rest of the week with no probs until 2 hours into today's journey home. I was running low on fuel (almost to empty on guage) when the car wouldn't reach full boost again. I stopped to refuel (only BP 95ron available) and continued without any further problems. Car was boosting well (just on the 10psi) along A4 and overtaking slower traffic without problem...... :confused:

Does this sound like a dodgy knock sensor connection? (perhaps made worse by the outside temp)

If I take the car to a Mandella for a diagnostic, will the fault be "remembered" by the ECU, as it will probably be running fine?

Thanks guys

Richard :cool:

Any