Does any one know what could be causing a chirp on acceleration? I have replaced all the idle,tensioner, harmonic balancer, alternator, power steering pump, and new belt. Truck sounds great at idle up to around 2000 rpm and then develops a chirp,chirp,chirp noise. 08 f150 lariat. Thanks

 

Will it do it if belt off .Cold engine .What kind of fan do you have .Electric control? Water pump, ac clutch pulley . Does belt line up good ,in line ? I had a alignment problem on a corvette, Had to torque balancer in to get alignment . You do know crank pulley is a two step torque with a stretch to yield onetime bolt .

 

[QUOTE=redfishtd;6149249]Will it do it if belt off .Cold engine .What kind of fan do you have .Electric control? Water pump, ac clutch pulley . Does belt line up good ,in line ? I had a alignment problem on a corvette, Had to torque balancer in to get alignment . You do know crank pulley is a two step torque with a stretch to yield onetime bolt .[/QUOTE

Haven't tried it with belt off, it is electric control fan, haven't touched ac. I had Ford install harmonic balancer but does look like they used old bolt. ]

 

where is sound coming from?

 

Does it do it in neutral/park, or only in gear?

 

Don't know, cant find it

 

Does it in both when revved up 2000 or more, I do know this I put all the old idler pulleys on to see what would happen and it's a constant chirp.

 

Pull the belt and test.

 

I will try that tomorrow evening.

 

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