2006 Mustang 4.L - Intermittent Low RPM Clanking

bm2006GT

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Hi Everyone, Totally new here, so hopefully I'm following all the rules with this post.

Looking for some help. My Son and I just bought a 2006 Mustang GT with around 114k miles.

Car runs really good in general and gets up and goes nicely when you get into the throttle. Has a JLT Intake with a BDX/SCT stock tune to compensate for the intake.

One major problem is that under low speed, low RPM (around 1000), under a slight load, the engine starts clanking and gets a bit worse as RPM increases and then goes away with more RPM. (See video). This doesn’t always happen, only under the right conditions.

Wasn't sure how to add a video, so here is link to a post I did on Reddit with a video of the car making this this noise. I posted it on R/Mechanicadvice but not much help so far: https://www.reddit.com/r/MechanicAd.../?utm_source=share&utm_medium=web2x&context=3

Anyone know where I should be looking to start? Did a datalog with a blue driver and noticed a spike in fuel pressure from 38/39 to 60 is for a short time and the timing advance cylinder 1, drops down to around 8/9 at the same time as the noise starts happening.

I could log more data, just not exactly sure what parameters are important.
 

stkjock

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my first thought is that sounds like rocker/lash adjuster noise, you could pull the valve cover and check to see if any rockers/adjusters are noticeably effected.
 

bm2006GT

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Thanks for the reply, will check that out as one of the potential sources of the problem.
 

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