vac leak= hanging idle?

[MIKESTANG_SVT]

After checking my TPS voltage, FRPS, and replacing my IAC, my idle still hangs up at 1100 rpm's. I have just discovered a possible vac leak in the back of the s.c.

I used zip ties to hold some hoses and lines out of the way and one got sandwiched between the s.c. and intake. I just found it while cleaning the engine bay. I tried to pull it out but it won't budge. I'm sure it put one hell of a dimple in the gasket anyway. Just wonder if that would cause my high idle?

 

[MIKESTANG_SVT]

ttt

 

[kwlscott]

i'm going thru the same thing. i've checked for vacuum leaks but now i'm going out to check better behind the blower. i put on an accufab t-body and plenum this weekend and my idle got so bad-1200-1400 rpm that today i pulled it back off and put the factory pieces back on. this cured 90% but i'm still looking for a "real" fix. now my idle hangs at 1000 but after 10-15 seconds it goes back to 700. let me know what you come up with as i now have a $500 paperweight.

 

[kwlscott]

when did your hanging idle start?

 

[MIKESTANG_SVT]

mine started after the blower was ported and put back on.

 

[MIKESTANG_SVT]

ttt

 

[01cobravortech]

i'm going thru the same thing. i've checked for vacuum leaks but now i'm going out to check better behind the blower. i put on an accufab t-body and plenum this weekend and my idle got so bad-1200-1400 rpm that today i pulled it back off and put the factory pieces back on. this cured 90% but i'm still looking for a "real" fix. now my idle hangs at 1000 but after 10-15 seconds it goes back to 700. let me know what you come up with as i now have a $500 paperweight.

I bet your issue is due to the Accufab blade stop screw not being set correctly or TPS being dialed in correctly or the Accufab itself throttle blade shaft moving a bit. I went through the same issues after my Accufab stopped working properly after 8k flawless miles. Ultimately, it became a paper weight since Accufab wouldn't take it back and now the BF works flawlessly. Superior product.

 

[01cobravortech]

After checking my TPS voltage, FRPS, and replacing my IAC, my idle still hangs up at 1100 rpm's. I have just discovered a possible vac leak in the back of the s.c.

I used zip ties to hold some hoses and lines out of the way and one got sandwiched between the s.c. and intake. I just found it while cleaning the engine bay. I tried to pull it out but it won't budge. I'm sure it put one hell of a dimple in the gasket anyway. Just wonder if that would cause my high idle?

You didn't reuse any gaskets for the lower intake for the blower right?

 

[mike302]

I have very similar problem too! what can it be??? could it be leaky valves???

 

[MIKESTANG_SVT]

You didn't reuse any gaskets for the lower intake for the blower right?

no, I bought a new one. I'm thinking that piece of zip tie may be causing the problem.