Stevo

A few days ago the engine started pinging... I just put this down to a bad batch of fuel , but after a few more tanks, its still doing it.

So, if its not a bad batch of fuel, and I haven't noticed it before at all, it just seems like the last few days.. What could be the other causes for this ?

I was thinking about trying with a better fuel, or just octane booster to see if it stops, but this dosn't really answer what the problem is, and why it has JUST started?

Only owned the car about a month.. its a EL ghia, its just done 70,000ks

Steve

EDXR8

Could be a bad batch of fuel that has just clogged up an injector or two, might try some injector cleaner. Timing may have shifted, Oxygen sensor may have been clogged up, ACT sensor may be faulty or MAF sensor may have got oil or dirt on it. I would start by doing timing and maybe run some injector cleaner through. Run the EEC diagnostics to see if there are any fault codes there (will tell you if any sensors are stuffed). And maybe clean MAF hotwire (especially if you are using an aftermarket oiled aircleaner like a K&N).

Stevo

Cool, thanks for that edxr8

Sprint_ED

what fuel mine always pinged on optimax, synergy fixed that :p

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sylox

Interestingly enough my xr8 was pinging badly on a tank of BP ultimate before it was chipped today. Never done it before either.

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rossi

Hot temps will also cause pinging. Maybe invest in a phenolic spacer.

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The only time you have too much fuel, is when you're on fire!

dodgie

Could be a faulty EGR valve also.

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ebxr8240

Try some water injection and drive it hard or some hi-sh rpm you may have some carbon build up in cylinders...
An old technique in the carb days was to inject / squart some 2 stroke/ upper cylinder lube into engine while idling fast, then turn off leave for a couple of hours.Then take it out on hi rpm drive.Like speed limit in third gear [manual] etc..The lube softens carbon and rpm hopefully gets rid of it..
Often if there is a sharp piece of carbon in cylinder it glows hot and ignites combution too soon causing detonation...

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eb2flyz

have you advanced the timming at all during winter? could just retard it a couple of degrees.

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