Shaking at 4500 rpm

[chaggard27]

Hey there guys so I have been searching and reading some posts and I have an idea of what is wrong but I want to get advice as well. So here is the deal I have my mod list updated and since about two weeks ago i have been randomly hitting what seems to be fuel cut. The only thing is that it is not always a complete cut off. At times it is just a very violent shaking in 3rd and 4th at about 4500 rpm. I have the boost set at 17 psi and i have been adjusting the safc-II both to rich and lean. Under boost I have an afr of 11.2 which is ideal and then all of a sudden it wil shake violently or just like hit a wall and not go until the revs fall and then i hit the gas again. Also when it shakes if i just mash it it pulls through and then pulls strong after that...so i am confused as to what it is. I dont believe it is fuel cut because if it was it wouldnt pull through and then pull strong would it? Also I have changed the coil pack and same results. My next step is to pull the plugs and check gap and or get new plugs on it. Any other ideas as to what it may be?

 

[Chaosweaver]

Not recirculating the BoV does this sometimes.

Edit: I would also check the MAF, you may not be getting a correct signal.

 

[chaggard27]

hahaha....and i didnt even tell you that i had done open atmosphere...i like the sound but the shaking has to go away. I will put it back recirculated and see what happens

 

[Chaosweaver]

Lol, I had the same thing happen to me before. I haven't recirculated the BoV since I learned to drive around the problem, usually happens at low speeds in higher gears for me. I will eventually recirculate it, but I love the sound of the RS BoV.

 

[chaggard27]

Yeah i love the sound but i just hate the violent shaking...afraid to shake the motor apart