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post #1 of 9 (permalink) Old 11-18-04, 07:36 PM Thread Starter
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Engine now pinging

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


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post #2 of 9 (permalink) Old 11-18-04, 09:23 PM
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Re: Engine now pinging

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).
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post #3 of 9 (permalink) Old 11-18-04, 09:28 PM Thread Starter
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Re: Engine now pinging

Cool, thanks for that edxr8
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post #4 of 9 (permalink) Old 11-19-04, 12:09 AM
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Re: Engine now pinging

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

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post #5 of 9 (permalink) Old 11-19-04, 12:47 AM
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Re: Engine now pinging

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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post #6 of 9 (permalink) Old 11-19-04, 12:53 PM
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Re: Engine now pinging

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

Learn from other people's mistakes. You won't live long enough to make them all.

If there's commotion coming from the passenger seat, and nothing but earth going round and round outside the windows,.......then everything is not as it seems!

The only time you have too much fuel, is when you're on fire!
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post #7 of 9 (permalink) Old 11-19-04, 04:37 PM
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Re: Engine now pinging

Could be a faulty EGR valve also.

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post #8 of 9 (permalink) Old 11-19-04, 05:00 PM
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Re: Engine now pinging

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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post #9 of 9 (permalink) Old 11-20-04, 12:17 AM
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Re: Engine now pinging

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

std stroke, alloy heads, comp cam, tfs manifold, 75mm t/b, 70mm maf, 30lb inj, adj fuel press reg, twEECer



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