Hi guys on my 93 F150 5.0L I have a ping/rattle under heavy acceleration/higher rpms. I don't hear it under regular driving conditions and am getting 18-19mpg on the highway.

I have adjusted my timing back down to 10 degrees/btdc (from 12 degrees) this made no difference nor did running octane booster in my gas.

I read that this sound may indicate a lean condition but maybe it is just the high mileage on the engine (320,000 kilometers)

I pulled a plug (#5) and it looks alright to me but I thought I would ask the experts in case I am missing something.



The mods to the engine are

BBK shorty headers
Magnaflow Y-Pipe with high flow cats (installed less than 5,000 kilometers ago)
New wires, plugs, cap, rotor
K&N Filter (not a drop in, more of a homemade warm air intake)
Rebuilt the fuel injectors
EGR & smog all function properly

Thanks in advance for any help you guys can offer

 

I assume this is a SD setup, not MAF? When was the O2 sensor last replaced?

 

It is a SD setup and I have not replaced the O2 or the fuel filter since buying the truck 18 months ago.

I have a new O2 sensor, fuel filter and 8 Motorcraft copper plugs on order, should see everything tomorrow.

The plugs that are in it right now are Accel and after reading some posts I decided to try the recommended Motorcraft copper plugs.

I will get everything changed out on the weekend and see how it runs next week.

 

Unless it's the flash those plugs look lean