Another stupid question
 

I have been running my car for the last 2 weeks on reguler unleaded, and usually run premium. A couple of times I have passed and when I really pushed the car it sounded really rattly, like your shaking a can of spray paint. Also, I need a tune up. Is this sound because the car is used to the good stuff, because it needs a good tuning or both?

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Steve Stumbaugh

89 LX 5.0 5sp.
Removed air silencer
Motorcraft 8mm wires
Autolite platinum plugs
BBK O/R h-pipe

Sounds like the classic case of pinging. What is your timing set at? You can do one of two things to rectifiy the situation:

1) Reduce your timing back to stock (10* BTDC); or

2) Use a higher grade gasoline (92, 93, 0or 94 octane).

Hope this helps,
E

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1991 5.0 LX Coupe - 38,000 miles

13.17 @ 106.14 mph w/ 2.138 60'