I've heard mention of the "6 liter tune up" But I haven't been able to find it as a sticky anywhere. Could someone point me in the right direction? My wife is taking the kids to CA for a month and a half this summer so I'll have some free time...

 

ignition upgrade and timing bump (no 56K) - FSB Forums

This is the best one I have seen so far.

 

Sixlitre was the guy that brought it to this site.

 

To sum it up: copper Motorcraft plugs gapped between .050 and .055; better plug wires, like 9mm Ford Racing wires or whatever you prefer; new coil, but there was a lot of debate whether or not you need a hotter one. I used an MSD unit that has a really high output and there's not drawback to using a hotter one besides price probably; new cap and rotor, again I used MSD parts there with good results but there are other options; bump the base timing up to ~12* BTDC, or until just before you get spark knock.

It's a very basic tune up that often yields better throttle response, and a little more power since these parts are 20 years old or better.

 

Cool! I already did everything but the timing about 6mo after I bought the truck. 2 more weeks and it will be time to work on my old rumble truck.

 

One more question. Will I need to adjust the idle speed after advancing the timing? I had to do so on on old beater years ago but it had no computer control.

 

No adjustment necessary. If the idle goes crazy, that means there are problems elsewhere.

 

Would this adjustment work for the 4.9L I6 also?

 

Yes it will, but there are a couple of really minor differences IIRC. Search the net on the sixlitre tune up for a 4.9 or a 300 and see what turns up. I could be mistaken.