rattling=pinging in Ford '97 4.6L sohc !?

[97tbird]

My car is 1997 T-bird with the 4.6L sohc v-8.

I read almost everything on the net related to "pinging" and "rattling", and it seems that the "rattling" noise I hear on acceleration(especially at the highest rpm's just after th2 2-3 and 3-4 upshifts) really IS pinging!!(all the t-bird 4.6L experts think so) (this rattling stops when I back off the gas)
...and I'm using 93 octane, had plugs/wires changed a few weeks ago...and the fuel system cleaned.. so what can still cause the pinging?

about 9 months ago, I heard the same "rattle" up to about 2500 rpms/45 mph, and i started using 93 oct. gas., and it stopped the rattling(pinging), but why is it pinging again, on 93 oct, and with new plugs/wires?? it also has less power.

Anybody has an idea for a solution?Thanks in advance.

 

[rugerman1]

Carbon build-up in cylinders?Try some fuel system cleaner like Fuel Power,Neutra,or Techron.
Keep us informed of the results.

Mark

 

[theguru]

You might also try buying your fuel for another station, sometimes they can get a bad batch.

 

[DavoNF]

Try cleaning your MAF sensor, especially if you are using an oiled type air filter.

Dave

 

[Christopher R. Wise]

My Toyota likes Chevron 92, tried Shell 92 pings alot, tried several tanks still likes Chevron.

I know the Techron Fuel Cleaner works great.( not the Pro Guard).

But I know on the 4.6L the EGR passenges like to clog, lack of EGR can cause pinging also, allows combustion temps to reach over 2500*F, Everything gets a little hot at that temp.

I even made a custom wrench to get the EGR tube off.

CRW

 

[Mike_dup1]

quote:

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The symptoms of a improperly functioning
MAF are hard starting, engine stall, pinging, lack of power, jerking, hesitation/surge on acceleration, and high emissions.

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quote:

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Due to the high number of possible reasons for a MAF failure, the exact cause is often improperly diagnosed. This is even more likely as diagnostic tools available can only indicate that a MAF is not functioning and provides virtually no information as to why it failed. All too often, the air filter currently
in use is blamed for the MAF failure, whether
it be a conventional pleated paper or an oil wetted foam. However, the likelihood of it resulting from the air filter is minimal at best.

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