Engine RPMs spike when idling.
Hey guys I just bought a 2011 Ranger Sport with the 4.0 V6 36,000 miles.
The truck drives great, no problems at all. I just had a question if this is normal. When I'm idling the RPMs are right at about 750, and sit there nicely. When I turn the air it seems to spike up to 900rpms every 15-20 seconds. It will jump up to 900 for about half of a second and then come right back to 750. It never drops down below 750 and doesn't go above 900.
It feels like when you turn on the A/C and the compressor kicks in. But I'm not using A/C, I just have my heat on, blowing on my windshield/defrosting setting.
Is this normal? I normally wouldn't be concerned, but I just bought the truck and its still under a warranty.
It might be a dumb question but I just want to make sure it's normal.
Thanks!
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