i was just wondering what the normal rpm should be when my 1997 F-150 4.2L is idle at a stop (ex: at a red light)?

 

I'm thinking about 900 rpm.

 

is that while it's on drive?

 

I think Mine bounces around at 800ish at idle. For "drive," Can't help you there. I have a 5spd.

 

i know when i first start my truck, a 5spd, when its cold, it idles at about 2k or higher. Anyone else notice that?

 

YES! My engine roars at cold start up. I can put in first, shift it to second and coast up to 15-20 mph without touching the gas. No wonder it gets 17mpg.

 

seriously! i think i use about .5 gallons just warming her up in the morning.

 

My '02 5-spd idles about 850-875.

 

same, 01 automatic. I takes forever for it to drop to 1000 rpms in the morning. although it is in the 20's..but still

 

my 98 idle's at 650 and jumps to 700 . wants to stall

 

mine idles between 800-900. and yes that thing roars when its below 50 degrees.

 

Manster,
Yep they all idle high on start up, that is the automatic choke kicking in, its warming up the engine for ya.

 

I just put a mac intake on my truck. And I noticed on colder mornings, there is this tremendously huge "air sucking" sound coming from the filter after I start it up.

I figured it was the fast idle right off the bat. But it's amazing the sound the mac intake makes when more air is being pulled through the engine.

 

hi,mine is a 1997 auto and hot it idles at 600 rpm and real steady. cold start it is up to 1100rpm until warm. hope this helps.

 

at startup the computers sensors recognize the engine is cold and goes into closed loop "choked" until warm then switches to open loop when warmed up.