Hi all,

I'm not sure if this is just my not being used to a truck (or the 5.4 engine), but I find that when the truck is in park, if I rev the engine a little (not too much), when it revs down, the engine has a slight shake to it (which kind of rocks the truck).

Is this normal?

 

Why do you rev your engine in park? Just to waste a little bit of gas?

 

I hear that it's a bad idea to do that because it messes up your catalytic converter but I'm not sure if this is true. Something about the unburnt fuel going into it because there no load on the engine??

 

when i rev it up in drive i hear screeching and smell burnt rubber. is this normal?

 

Yeah it's called a burn out lol

 

No no, I'm not talking about reving the crap out of the truck in park, I'm just talking about a quick blip of the pedal. Even to just bring down the RPMs.

This shouldn't harm the truck, and shouldn't cause the truck to shake a little.

In all other cars I've owned, it hasn't shown this type of behavior.

That's perfectly normal.

 

Don't rev the engine in park. Problem solved.

 

Ford engineers are trying to save fuel by using a very low idle speed. It probably dips a little low.

 

A very true statement.

 

That is completely normal for your truck to do that.

 

They all do it, its a rev limiter. I think it'll only go up to 3,000 rpms to keep you from revving it under no load and shooting the pistons through the hood

 

i know exactly what your talking about. ive noticed it a few times in my 04 4.6, it feels like the truck is about to die for a second but then it goes back to normal. i believe L8 APEX is right about the low idle rpm.

 

i cant say for sure but i dont think its true. in the winter time i always go out and crank my truck and hold the pedal to the floor for about 5 minutes to get the heater warm. no problems yet.

 

If you leave the oil out of the engine it will heat up faster. All that oil is robbing heat-producing friction from your engine.

 

lol ill try that next winter. itll probably be about time for a new engine by then anyway.