Hello! I have a Ford Ranger 2,9L V6 from 1989. When i start the engine when its cold it runs smooth and steady with a little higher rpm. When it gets warm it idles att a lower rpm ( of course) but the idle isnt steady and smooth, it goes up and down in the rpm, and sometimes its almost stops for a second.. Do you understand me? excuse my english, im from sweden and doesnt type in english so much..

Does anyone have some ideas what it could be?

Greatful for answers!


//clms from sweden

 

sounds like maybe you got a plug problem or your not getting fuel to the motor when it gets warm. try changin the plugs, wires, and airfilter. i did that with my truck and it idles 10 times better than it did.

 

OK, i will try that! I'll guess that this havent been done in a while!.. might as well change fuelfilter at the same time..

thanks for the respons!

 

if that doesn't work try the throttle positions sensor, or just a guess it could be the fuel pump?

 

I had a similar problem in my 90 Ranger, turned out that a vaccum line had fallen off. I'd check all of your vaccum lines before you spend money on any thing.