has any body try tuning a 4.2L v6 f150 with performance tune and there engine starts knocking at high rpms, and when loaded to stock it stops

Joe

 

You using the right octane? Cause if you’re loading a performance tune that requires 91 and you only got 87 that would cause it to knock

 

+1 The wrong octane would cause the knock. Thats really the only way to get an engine knock unless you have mechanical problems that the 1714 is showing.

 

Well first, the 1714 is only for 2004 model year trucks -

Second, no, it is not normal at all to get spark knock when using that tuner - that happens only when you do not use the right octane level of fuel, or use poor quality fuel, generally speaking - or you have some kind of mechanical issue or a modification that leans the engine out, or something along those lines - so no, that is not normal.

Remember that when you load "performance" tuning, usually it requires the use of the highest quality *premium* gasoline of at least 91 octane - and before you load that kind of tune, you need to let the current tank of lower octane gas run down until the low fuel light first comes on, then fill the truck up with a full tank of premium gasoline, and *then* load the performance tune, just to give you a general idea as to the basic correct procedure. Don't try using a premium gas tune on lower octane, or top off 1/4 tank of low octane with higher octane, or only put a few gallons of premium in, etc. Before changing to a higher octane tune, let that fuel run down load, and then fill it all the way up with good quality premium fuel so that you get as little "dilution" of the incoming premium fuel as possible.

I hope that brief info helps, & good luck!