Have to clean my Accufab 75mm TB every few months

[Smeech]

I find myself having to clean my Accufab 75MM TB every few months. The gas pedal feels as though it sticks, thus resulting on jerky shifts/acceration... and it's hard to drive smooth. TB spray cleaner definently helps. There doesn't seem to be any leaks or anything that would indicate dirt is getting in the intake. The K&N has been cleaned and reoiled recently.

I've heard it could be excess K&N oil...but I don't clean/reoil my filter more than once a year...

Any suggestions or is this somewhat normal?

 

[chinostang]

try adjusting the bolt to make sure the throttle cable is nice and tight, taught, just not too loose. If it sticks right when you give it gas this could help. If its just sticking randomly I dont what you have going on.

 

[BMan5150]

I find myself having to clean my Accufab 75MM TB every few months. The gas pedal feels as though it sticks, thus resulting on jerky shifts/acceration... and it's hard to drive smooth. TB spray cleaner definently helps. There doesn't seem to be any leaks or anything that would indicate dirt is getting in the intake. The K&N has been cleaned and reoiled recently.

I've heard it could be excess K&N oil...but I don't clean/reoil my filter more than once a year...

Any suggestions or is this somewhat normal?

More than likely, it's not gunk or excess oil gumming up your TB and causing it to stick. It's vacuum lock, and it happens when your idle set screw backs off (loosens) ever so slightly. Even just 1/8 of a turn can cause this, or if any part of the end of the set screw is worn off, your tb blade will close just a little too much, causing enough vacuum that can't be overcome by the IAC alone, hence causing "vacuum lock." This is the cause of the momentary stickiness that you feel in the gas pedal when you move off idle.

I was really hesitant to mess with the idle screw until I spoke with an Accufab tech directly. The tech told me to tighten the idle screw by 1/8 turn increments until the vacuum lock is gone. I actually did it 1/4 at first but then backed it off to 1/8 of a turn and this 100% addressed my sticky throttle issue.

Make sure for good insurance that after you fix the vacuum lock you check and re-set (if necessary) the TPS, as this can cause idle and driveability problems if it's not reading in specs, which I think was between .98 and 1.0 volts. You'll need a voltmeter - it's super easy to do. I actually used two small fishhooks to pierce the TPS wires and more easily hook up my digital voltmeter. Oh yeah, definitely use a digital voltmeter and not an analog one.

Good luck and let me know if this works for you.

 

[SLY GT]

K&N cleaned every year????? You are supposed to be able to go 50K between servicing them.

 

[SLY GT]

sorry.double post

 

[archerto]

I was really hesitant to mess with the idle screw until I spoke with an Accufab tech directly. The tech told me to tighten the idle screw by 1/8 turn increments until the vacuum lock is gone. I actually did it 1/4 at first but then backed it off to 1/8 of a turn and this 100% addressed my sticky throttle issue.

I am having the same problem as the original poster with my accufab sticking from vacuum lock. Where is the idle screw on the accufab located so that I can adjust it?

 

[Mustang5L5]

K&N cleaned every year????? You are supposed to be able to go 50K between servicing them.

My K&N was black with city road grime within 15K miles. I clean it when it's dirty.

 

[myponyrocks]

I've never had that problem and I've had the intake combo on for a while now. Look into some white lithium grease for the outside moving parts, and oil and clean the inside. Or run some sea foam