Acceleration Chittering Noise?

Asked by Apr 10, 2016 at 11:47 PM about the 2004 Ford Crown Victoria Police Interceptor

Question type: Maintenance & Repair

I drive a 2004 Ford Crown Victoria Police Interceptor, V8 4.6L.

Recently I have discovered that sharp acceleration will cause a chittering
sound similar to that of a bug. It seems to be coming from somewhere
under the back of the engine compartment.  Accelerating will cause the
sound to increase in frequency. When the speed is constant, the sound
disappears. It does not appear when applying brakes or when naturally
decelerating.  I recently got an oil change thinking it was simply low oil
pressure besides the fact that I needed one, but that had no effect.
Revving the engine in park does not produce the noise. All other engine
noise is smooth, so I don' t think it' s an internal problem.  I have checked
for debris in the wheels and on the driveshaft, but other than that I am out
of ideas.

4 Answers

30,255

sounds like a low octain fuel..pinging...try and add some higher octain gas and see if it goes away or gets better.

If higher octane isn't the answer, Its recommended a new timing gear, chain & guides be replaced before 150,000 for preventative maint.

I have the exact same problem. I have a mechanician checked it. He said it came from the transmission. Did you solve the problem? Any suggestion?

Had the same issue and found that the trouble code was P1405, which has to do with the EGR Valve and related systems. I found that one of the hoses on the DPFE (Delta Pressure Feedback EGR) Sensor had come off. After plugging it back in, the noise went away and I was able to clear the trouble code. The DPFE Sensor on our cars is located at the very back of the engine on the passenger side (just in front of the transmission dipstick). It has an electrical connector and two tubes (facing downward) that should have hoses attached..

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