Spark Knock Under Accelleration

[Ric55]

I have an 07 XLT 4.0L V6. It runs great, except for a persistent spark knock when I accelerate - especially when passing on the highway.

Does anyone know of any applicable service bulletins?

Thanks,
Ric

 

[JohnnyO]

In order of probablility:
1. Go to the dealer and get the computer reflashed.
2. Is this the time of year when they have oxygenated gas where you live?
3. The EGR valve is malfunctioning.

 

[Ric55]

Thanks for your help . . .

. . . I'll certainly try those things.
-Ric

 

[40twist]

clean the airflow meter

 

[PEAR0119]

Are you sure it is spark knock? And not the timing chain. My 06' 4.0L marks a spark knock sound under acceleration but only between 2500-3200 RPM. anything above or below there is no noise.

There was a TSB out for the 2000 and 2001 explorers for this same exact noise. And they state that its a problem with the primary timing chain and tensioners.