Knock at Part Throttle

[OMISPEED3]

Hey Guys!

I have been seeing randomly knock at part throttle, sometimes is 0.35°, 0.70°, 1.05° to 8.0° and then it goes. I have no idea what is causing it. It just at part throttle. I attached some logs cruising from 1st gear to 5th. The log (Cruising) is in 5th gear. Can someone drive to correct this.

Best Regards,

-Luis-

[skiptownmcat]

I have this quite a lot, it's nothing to worry about. You can minimise it by checking nothing is rattling in the engine bay, mine was greatly reduced by tightening the ic shroud but it is still there.

[mituc]

The part throttle knock retard should not be higher than like 1.05-1.4 degrees. However, you have noisier pistons and that may amplify it under some circumstances, but 8 degrees... is huge.

All the KR values you have in those 4 ignition logs are normal. Don't worry about anything below 2 at PT. However, in that cruising log we have a huge KR which lasts like for ever and it's under minimal load/boost, even engine braking or close to that. So I think it's something loose banging against the IM or cam cover or in that area, or even something resonating from the other corners of the engine (clutch, some engine mount).

[OMISPEED3]

I really don't know if that could be the timing chain, because my car has 100,000 miles and I never change it. I'm just curious because is randomly, sometimes is less.

Sent from my Classic EVO!

[skiptownmcat]

I used to see 8 quite a lot then I tightened the shroud and put some very thin foam between the intercooler and it. I only see 1-4.5 degrees now and the frequency is a lot less.

[OMISPEED3]

Another thing is, I didn't hear a thing when KR was happening.

Sent from my Classic EVO!