Idle surge

[Garth]

My 98 E.B. 5.0. I just notice that while in park the tach needle, every so often, goes from about 5,500(what ever the stanard idle is)to about 8,000rpm. I would not have notice except you can hear the idle change when you standing outside of the vehicle. Does other 5.0 out does this, or do I have a problem? Where can I get a Explorer specific tune-up kit? If I need one.

 

[jimbo74]

you sure that isnt 550 to 800 rpm? your truck at wot probably cant even reach 8000 rpm... and the stock tachometer only goes to like 6000...... anyway... that isnt a big jump... it is probably normal... the idle on my truck is about 700 rpm... also, this jump may occur because the A/C compressor may be cycling... Is any of your climate control system on when this surge happens? Welcome to the site...

 

[Garth]

Ok you are right about the rpm being in the 000's. I do have one of those auto climate thingy but the first time I heard it I thought maybe it could be the ac trying to maintain the climate. I switched it to manual and it did not change it.

 

[jimbo74]

turn it off completely.... just becuase the A/C is off according to the switches, doesnt mean it is really off..... the a/c depending on the switch condition will still come on with some of the regular vent settings....

 

[Garth]

Cool!