GTR Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
430 Posts
Discussion Starter #1
Hi all,

I seem to have an irratic knock reading on my power fc, sometimes it will idle at around 10-12 when warm then other times it will idle at 1-2 when warm. When the knock reading is higher at idle the overall knock level is higher throughout the whole RPM range.

I not really sure where to start, it seems to change week to week....
I'm pretty sure it runs ever so slightly rougher when the idle knock is high but im pretty sure there is actually no DET.

Is there anything i can check or do to try and figure out whats going on?

My ideas so far:

1)Loose knock sensor?
2)Possibly a dodgy plug or coil giving up?
3)Dodgy ignition amp?
4)something rattling in the engine bay causing the knock reading to be odd?
5)Dodgy earth?

Advise greatly appreciated!

Thanks,

D4T
 

·
Registered
Joined
·
430 Posts
Discussion Starter #6
Erm, same quiet road, same quiet time.... louder noise? unless you mean something that intermittantly vibrates in my engine bay?
 

·
Registered
Joined
·
1,166 Posts
The knock sensor is reading general engine background noise. `Noise` by its nature is random low-level input. There is effectively no difference between 1 or 12.
 

·
Registered
Joined
·
8,804 Posts
I'd say anything under 20 is happyland for the engine anyways. Just cranking the engine gives me a knock of 10, then it idles at 1-2. Full boost brings me up to 17 at 8000rpm.
 

·
Registered
Joined
·
430 Posts
Discussion Starter #9
see thats the thing, when its reading low on idle i never see any knock readings over 30, otherwise it reads upto about 50! :(
 
1 - 10 of 10 Posts
Top