i have been getting a pinking from engine under slight load.when u put foot down it goes away if anyone has any ideas please let me know.its has been on local garage codereader and it came up with nothing and have tried injector cleaner also use optimax.
its a punto 60s 1998 spi.

ON A 60s! blimey.

If it really is pinking you need to use octane booster to stop the detonation, you could get aquamist water injection

hi thanks for your advice.i thought if i upped the octane it would help but i would like to find the cause and cure it permanantly.someone said it could be the tdc sensor,someone else said it could be drawing in air or carbon build up in engine.it has done 27000 miles.it dosnt pink when cold,it does it in all gears half way through rev range if u touch throttle slightly,press it hard down and it goes away.if u go along along at 60 and hit a slight incline it pinks press down on the gas it stops and pulls away,its driving me nuts any suggestions would be grateful.
thanks

Pinking is generally caused by unburnt fuel igniting in the exhaust. Check your air filter is clean or replace it. How's your consumption been. Is it getting worse or staying the same? The TDC sensor sounds like the best thing to check.

2000 ELX Green Induction kit, Ecotek Valve.

Of course it won't do it when cold. The petrol is detonating before the spark gets chance to ignite it, this can be down to the heat of the cylinder or the pressure (in the same way a diesel works).

Of course the engine is drawing in air, if you think you may have carbon build up you could try a dose of 10K boost.
Gears have nothing to do with pinking, 2000rpm is the same in any gear.

You can get pinking from over-advanced ignition timing:
spark ignites mixture too far before TDC, piston still going up as mixture burning tries to push piston down[xx(]
Nasty noises - damaged bearings, hole in piston, if done to excess.
Not recommended.

There maybe too much vacuum advance on light throttle..

As far as i know pinking is when you start to get lots of smaller burns under combustion instead of one big flame it isnt as extreme as actually firing too early, fuel burning in the exhaust isnt pinking as far as i know. it can be caused by over advanced ignition.

are you sure its pinking. i am sure its the ignition coil fiat coils sometimes get to hot and burn out. test it with plastic forceps. let me know

Agree pinking isn't unburnt fuel firing off in the exhaust (that's a backfire!). Pinking is fuel firing in the cylinder earlier than desirable and what you are hearing is the poor cylinder (and con rod and crank bearings) trying to be exploded down when the mechanics are pushing them up still.

Causes are weak fuel mix or more likely wrong timing, as previous posts say. Suggest on a modern vehicle this is unlikely to be fixed by home mechanic (unless air-leak is obvious).



all things must pass.