Hey guys just lookin for a little help here, i was driving the other day and when my 4.2 got to a 1/4 of a tank it started to idle very very hard.... so just for grins i pulled into the gas station and filled it up BOOM no rough idle...... Is this a sighn of a problem to come or is there something easy that im over looking? I had a little hesitation before and was thinking about replacing the fuel pump but i wasnt sure if that would solve the problem or not. thanxs guys

steve

 

ya think it could have been bad gas...or water in it? has it done it again?

 

hey mj, yah it does it all the time, when you hit that quarter tank mark it gets the shakes no matter what kind of gas i use. oh yah, is there any kind of gas that is better than another to use, i mean 87, 89, 91, 93????? just lookin for suggestions. thanxs

steve

 

If you are running a stock truck, your engine is designed for 87 octane, so stick with that. As far as what is causing the shuddering? I have no idea, especially since its only at 1/4 tank...

Garrett

 

yah its very strange, hey would using 91 or 93 cause a valve train tick or coudl that be something else??? yah i dont knwo i think im just gonna throw a new fuel pump in it for good measure.

 

whats a fuel pump cost on these trucks...just out of curiosity. some stuff i am amazed at how expensive it is....then other stuff I am amazed at how cheap it is.

 

The pump probably costs a lot...I had to buy one for my 95 V6 Explorer and it was $75 and O'Reilly's.