Mk II 172 pinking under hard acceleration

[chris_leic172]

On a few occasions Ive found that my Mk II 172 starts pinking quite badly under hard acceleration.

Should I just put this down to some dodgy fuel or could there be another reason. Ive been using Optimax.

Chris

 

[poundrick]

Ive got to admit my Cup suffers from the same problem, take it easy and get it booked into a dealor to get looked at, only problem is most dealors will come back and tell ya there is nothing wrong, the useless w**kers

 

[KDF]

sounds like something a dealers would say..

maybe you got some dodgy fuel.. maybe your timing needs adjusted..

I use optimax all the time too and havent had any problems.

 

[Adams_16v]

if its pinking on optimax whats it like on normal fuel?

 

[adiclio16v]

one point to remember is optimax doesnt keep its octane rating for long

so if u fill up to a full tank and dont use the car that much the octane rating will be dropping quite quickly

adi

 

[BRUN]

try some Optimax and some Octane Boost.......if it stops then its definitely a problem with regards to the fuel/sensor of the fuels octane level....

 

[JonC]

I got the same when I put in normal 95ron unleaded mixed with half a tank of optimax this weekend cos I couldnt find a shell station. Only ever use optimax since I got the car from new. Going straight back to optimax when its nearly empty.

 

[KDF]

just buy 4000 bottles of octane booster and fill your tank with them.. normal fuel is for wussies.. octane booster is the new optimax.

 

[Slugger]

what does pinking sound like?

 

[BRUN]

marbles...

 

[BenR]

probably not the knock sensor as its not used @ WOT or detonation problems would never occur, but EGTs would go through the roof.

Pinking is a metallic rattle noise.

r****d your ignition, youll gain power and longevity because the pressure rise is occurring too early.

 

[TB11]

Optimax keeps its octane rating for 6 months (98.6 is the MINIMUM rating for this fuel) and as most of these fuels deteriorate after 6 months anyway.... (i got my info direct from shell, just email them like i did).

For octane booster i would look at http://www.scoobymania.co.ukwww.scoobymania.co.uk as they do millers octane plus for 22.20 for 10 bottles (best value i can find) so you could try that?



Tony

 

[mikeherts]

I get confused with all the different explanations of Optimax. Some say its refined at its octane, some say its regular 95 with octane boosters and cleaning additives. Some say it deteriorates back to 95 RON within 40 days from refinement and Tony says that its 6 months and 98.6 minimum.

Personally I feel that my car is even more unresponsive than usual whenever I fill with Optimax. Ive tried it time and time again and as soon as I change back to Optimax, it feels lifeless. BP SUL gives it the most life, hence thats what I try to use. I really wanted to feel something from Optimax and usually if you want something enough you even convince yourself that its there, but it actually feels worse.

Im glad it works for so many people, but I steer well clear of it now as Ive tested it enough to know that it doesnt work for me! I had put it down to living in quite a small town and the Optimax not being cycled quick enough and losing its octane (hence I believed the 40 day theory, but I dont know what to think now!)

 

[TB11]

Mike,

this is a refined fuel, ie no octane additives, the only additives are cleaning agents like every other manufacturer adds.

My info came straight from the horses mouth (shell uk) and if i can find the email again ill post it on here.

Tony