My 95 F150 started making a squealing/squeaking noise like a bad belt or pulley might sound when i started it a few minutes ago. The noise stops when i push the accelerator and starts again when i come back down to an idle. Its pretty constant, no breaks in the noise itself. Got a few minutes down the road and the check engine light came on. The belt feels tight with no cracking or signs of age, and pulleys all seem tight. Anyone have any ideas?

 

Do you have A/C? My guess is that the clutch on the A/c in engaging at a certain rpm. Just a guess though.

 

I wasn't running the the A/C or the ventilation at all. Would that clutch be making noise if it wasn't running?

 

I'm not sure, the clutch in the a/c might have a short or be sticking. This is just a guess.