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wont hold rpm's

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crazygn

10's here i come
Joined
Jun 11, 2001
Messages
1,583
The car runs fine just driving around town but at wot i cant get the car to rev over 4000 with out getting bad knock. I even tryed to run cam2 and unhook the knock sensor and it in park but it will rev to 4800 then falls on its face. My y link reads crazy at wot, 13 volts, 6 volts , 0.3 volts this is when i get the knock, alt tested good, batt good , belt good, . Ive tryed to change some parts and still does it. Ive tryed my brother coil , plug wires , plugs gaped at .34 , tps .42 -4.66 wot . I even pulled my valve cover to make sure i was getting oil to the lifters and cam was ok. I have tryed 3 chips and nothing.

cam sensor is on, what would make this thing not rev over 4000 when under boost. Iam also running 780-800 on the o2's and at 14 psi.

any help would be great , thanks guys:)
 
Fuel pressure regulator not letting fuel psi go up with boost, properly. Maybe a clogged vac line to the reg too.
 
Fuel press is good, i checked it with the gauge and it was ok with boost.

iam going crazy
 
possible valve springs but sounds more electrical if scann
tool is giving a bunch of weird readings.
 
yea i have a pretty new cam and 90lb springs, i have tryed every thing, i have a post a mile long in the hotair sec but just cant find the problem.
 
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