OK, it started and ran fine until I took off the dampener and also noticed that the somehow I broke a nipple off the plastic thing under the intake manifold - According to the manual this is not needed as it is a switched open atmosphere -vent - sooooo I take all the vaccuum line off and cap the nipple uunder the throttle body before the plate, and also the one right next to the egr on top - Now the car has a hard time starting and idleing real rough - If I hit the throttle is revs but than cant recover and just dies - Any suggestions? If I take a cap off one of the ports that I capped the car seems to idle and recover better but I cant have a open vaccuum. Help!
1jz issue after taking off dampener
- Thread starter 1jzQuest
- Start date
Update - didnt noticed this before
I can hear gas literely running through the fuel rail as if the regulator is stuck open or something - I am using the stock reg- could it be a reg problem?
I can hear gas literely running through the fuel rail as if the regulator is stuck open or something - I am using the stock reg- could it be a reg problem?
Nope no vac line on the dampener, it was just fuel hose - I removed it when I installed a Walbro and have a braid hose from hardline to fuel rail now like Aarons bypass kit.
Yes, I am still using the stock frp and still plumb to the second port on the fender side of the intake manifold.
1jzQuest;1534735 said:
It's a return system right? I think it's normal to have gas constantly circulating through the fuel system on a return style setup.
Yes, the fuel reg is on the return side of the fuel rail. I have a walbro, AFPR, and fuel line from DM. Before i installed the afpr i had no issues. Something else has got to be wrong.
Are you talking about the big port on the rear of the intake manifold? A picture of what you're working with would be cool.
I think you capped or need to check your ISCV, or Idle Speed Control Valve. Basically this is what bleeds air into the intake manifold to control your idle speed, I think it may work off of a temp sensor. Obviously it won't idle correctly if you cap this or it gets stuck shut. Put a breather filter on there and make sure you dont have any open vacuum leaks and I bet your problems go away.
Sounds exactly like what my car does when you cap the ISCV.
I think you capped or need to check your ISCV, or Idle Speed Control Valve. Basically this is what bleeds air into the intake manifold to control your idle speed, I think it may work off of a temp sensor. Obviously it won't idle correctly if you cap this or it gets stuck shut. Put a breather filter on there and make sure you dont have any open vacuum leaks and I bet your problems go away.
Sounds exactly like what my car does when you cap the ISCV.
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OK - did some research on some things and looked at the ISVC - it was clean and open -
The plastic thing underneath that I took off is 17650 - from what I have read only controls hot starts. Vac line comes from a port under throttle body to a "T" and then one goes to the 17650 one goes to ? I am guessing a charcoal can? from 17650 goes back to the inside manifold port next to the ISVC not EGR. I have 1 open port on the outside of manifold, - came that way - not for sure what it was connected to. When removing the 17650 I get two more open ports that I have capped. Here comes the weird thing- If I remove a cap on any of the manifold ports that I capped the idle smoothes out and can rev without stumbling. Do I need to keep the port under the throttle body that has the one way chaeck valve connected to the manifold? OR what could be the issue - 1jz bugging me out.
The plastic thing underneath that I took off is 17650 - from what I have read only controls hot starts. Vac line comes from a port under throttle body to a "T" and then one goes to the 17650 one goes to ? I am guessing a charcoal can? from 17650 goes back to the inside manifold port next to the ISVC not EGR. I have 1 open port on the outside of manifold, - came that way - not for sure what it was connected to. When removing the 17650 I get two more open ports that I have capped. Here comes the weird thing- If I remove a cap on any of the manifold ports that I capped the idle smoothes out and can rev without stumbling. Do I need to keep the port under the throttle body that has the one way chaeck valve connected to the manifold? OR what could be the issue - 1jz bugging me out.
I checked the ISCV tonight and its in the open position- I can blow in from exhaust side through the ISCV tube and into the intake. Was hoping that was the issue but looks like not