Lots of knock

[ielaser]

Cant seem to post in the log advice forum so here goes. Car has k&n filter, hacked aircan & mas, and removed bcs restrictor. Also my manifold has quite a few cracks and a broken stud, car also has fouled plugs. Can these problems be the cause of knock.

TPS RPM O2V TIMING KNOCK
100.0% 1719 0.64V 18° 12
100.0% 1844 0.68V 17° 11
100.0% 2156 0.70V 18° 11
100.0% 2156 0.76V 20° 11
100.0% 2156 0.78V 20° 11
100.0% 2250 0.82V 20° 10
100.0% 2313 0.82V 20° 10
100.0% 2375 0.82V 20° 10
100.0% 2500 0.84V 21° 10
100.0% 2531 0.82V 21° 10
100.0% 2625 0.84V 21° 9
100.0% 2719 0.84V 22° 9
100.0% 2781 0.84V 22° 9
100.0% 2875 0.84V 22° 9
100.0% 2938 0.82V 22° 8
100.0% 3063 0.80V 22° 8
100.0% 3125 0.82V 22° 8
100.0% 3219 0.82V 22° 8
100.0% 3313 0.84V 23° 7
100.0% 3406 0.84V 22° 7
100.0% 3500 0.84V 23° 7
100.0% 3594 0.84V 23° 7
100.0% 3688 0.84V 23° 6
100.0% 3781 0.84V 23° 6
100.0% 3875 0.84V 24° 6
100.0% 4000 0.86V 23° 6
100.0% 4125 0.86V 23° 5
100.0% 4219 0.86V 22° 5
100.0% 4344 0.86V 21° 5
100.0% 4469 0.86V 20° 5
100.0% 4625 0.86V 19° 4
100.0% 4781 0.86V 20° 10
100.0% 4875 0.86V 15° 10
100.0% 5063 0.86V 15° 10
100.0% 5188 0.86V 14° 9
100.0% 5344 0.84V 17° 9
100.0% 5438 0.86V 18° 9
100.0% 5594 0.86V 18° 9
100.0% 5688 0.86V 20° 8
100.0% 5813 0.86V 20° 11
100.0% 5906 0.86V 20° 11
100.0% 6063 0.86V 20° 18
100.0% 6094 0.86V 17° 18
100.0% 6156 0.86V 16° 17
100.0% 6313 0.86V 17° 17
100.0% 6406 0.86V 17° 17
100.0% 6563 0.86V 16° 17
100.0% 6594 0.86V 16° 16
100.0% 6656 0.86V 15° 16
100.0% 6719 0.86V 15° 17
100.0% 6813 0.86V 15° 17
100.0% 6875 0.86V 15° 23
100.0% 6938 0.86V 12° 22

 

[kenamond]

Get a boost gauge and do a boost leak test. If you have a big boost leak, you'll run rich as hell (ECU counts the air entering but some is lost, so it adds more fuel than what is needed in the combustion chamber), which could foul your plugs, too. Then your turbo runs much less efficient leading to much hotter charge temperatures which leads to detonation and high knock counts at higher rpm.

Sounds like you need to fix alot.

 

[JOEY A]

Get a 2G exhaust manifold replace yours, your lifters could tigger false knock. Fouled plugs would make the car miss etc so that could affect it also.

I would buy a new knock senser anyways, thats what I did when I got my car...

 

[ielaser]

Get a 2G exhaust manifold replace yours, your lifters could tigger false knock. Fouled plugs would make the car miss etc so that could affect it also.

I would buy a new knock senser anyways, thats what I did when I got my car...

If the lifters did trigger knock count then wont the knock just keep climbing through out the rpm.

 

[GVR4592]

It looks like real knock. Fix the exhaust leaks, get some new plugs, boost leak test, and check your base timing. What is the boost level during this log?

 

[ielaser]

It looks like real knock. Fix the exhaust leaks, get some new plugs, boost leak test, and check your base timing. What is the boost level during this log?

I'm not sure what the boost level is but the bcs restrictor has been removed, my guess would be somewhere around 10-14psi. My boost gauge just came in, all I need for it is a few fittings so hopefully I'll put it in later this week.

 

[andymoraitis]

Your biggest issue is the manifold cracks. A boost leak before the O2 will create plenty of issues as metered air escapes. Replace the manifold and try it again.

 

[ielaser]

Your biggest issue is the manifold cracks. A boost leak before the O2 will create plenty of issues as metered air escapes. Replace the manifold and try it again.

First I'll try a junkyard and hopefully find a 2g with one still in place and if I dont find one then I might just by one of the gt manifolds from dsmparts.

 

[andymoraitis]

That's a smart choice and the GT should be fine for your needs. While you have the turbo off of the manifold, it would be a great idea to remove the O2 houing from the turbo hotside and replace the gasket there as well as the O2 to downpipe gasket.

Good luck and let us know how it goes,

Andy