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Forum name4G63 Tech
Topic subjectLeakDown & Compression Test Question
Topic URLhttps://forums.2gnt.com/dcboard.php?az=show_topic&forum=i67&topic_id=8109
8109, LeakDown & Compression Test Question
Posted by Hult250R, Aug-04-05 02:49 PM
OK Ive been battling what I think is Phantom knock ever since I put the motor back in the car this winter after doing the following mods:
Fidanza Alum Flywheel
ACT 2600
MAFT
new timing belt and waterpump

Ive taken the motor out again and removed the balance shafts. Also hoping the Phantom knock was a motor mount or something i forgot to tighten the first time... It wasnt.

I did a compression test and got 155-160-165-165 (left to right)
I did a leak down test today and got a little blowby into the crankcase in all of them.
Would this cause Phantom knock??

Also theres no Oil in the coolant or vise versa

I hope i explained this right. Im trying to get this damn thing to the SO but I think Satan is against me.
8110, RE: LeakDown & Compression Test Question
Posted by eclipzGST, Aug-04-05 09:28 PM
Did you try replacing the knock sensor? They tend to get overly sensitive when they're on their way out.
8111, RE: LeakDown & Compression Test Question
Posted by Hult250R, Aug-05-05 11:09 AM
yeah, new knock sensor, new O2 sensor, Ive tried tuning it out too, no luck...
8112, RE: LeakDown & Compression Test Question
Posted by Diceman19, Aug-05-05 03:28 PM
you have dsmlink right? they have a "phantom knock" eliminator that you could try out. basically it just rejects readings from the sensor until a certain rpm.
8113, RE: LeakDown & Compression Test Question
Posted by Hult250R, Aug-06-05 07:54 AM
Originally posted by Diceman19
you have dsmlink right? they have a "phantom knock" eliminator that you could try out. basically it just rejects readings from the sensor until a certain rpm.


I wish I had DSMLink
8114, RE: LeakDown & Compression Test Question
Posted by Jeff_99gs, Aug-10-05 07:34 AM
Lifter tick. How old are your lifters?
8115, RE: LeakDown & Compression Test Question
Posted by Hult250R, Aug-10-05 11:04 AM
Originally posted by Jeff_99gs
Lifter tick. How old are your lifters?


Month old 3G big bores
No lifter tick anymore :P