Resolved 2G High RPM at Idle after rebuilt 6 bolt engine

[The_one]

Hi,
My car is having a problem with high rpm like 2k-3k at idle. In order, to keep it low like 1.5k I have to retard the CAS all the way (I don't know that's good or not), and screw the BISS screw all the way in. Could anyone tell me what can I do make the rpm lower ?

I did a compression test and fixed all the leaks but it didn't help at all. Also adjusted throttle cable too.

Car: 97 Eagle Talon TSi with 6 bolt block, 2g tranny

Thanks
V

 

[TURBOCASS]

I just had the same issue. First do you have a maf-t?

Have you set timing?

 

[The_one]

I just had the same issue. First do you have a maf-t?

what is a maf-t ?

I tested ISC 30.4 ohms, TPS within 3.5k-6.5k ohms
I also did a boost leak test and fixed all the leaks.

Have you set timing?

If i advance the CAS a little bit the car rpm at idle will hit 3k easily

 

[The_one]

Just to update the information. I set the CAS to show 5 degree with the BISS all the way down and the rpm at idle is 1.5k

thanks

 

[DSMjrv]

im having this same problem, start car from cold and it idles 3k until its full temp then settles to 2k. if i retard timing all the way it sits nice a 900rpm... but then i have no power at all... and BISS is all the way in.. and my ISC reads 31 across the board

its a 6bolt in a 2g also

 

[The_one]

im having this same problem, start car from cold and it idles 3k until its full temp then settles to 2k. if i retard timing all the way it sits nice a 900rpm... but then i have no power at all... and BISS is all the way in.. and my ISC reads 31 across the board

its a 6bolt in a 2g also

That's not a good idea don't retard your timing all the way down because it will overheat your engine overload

 

[DSMjrv]

hmmm blocked off the fiav but not the ISC and it dropped off about 600rpm... i'm running 1400 rpm idle now, which isn't perfect but still a lot better

 

[tom04841]

Even tho you said you fixed all the leaks, I still say you have a vacuum leak somewhere.

 

[The_one]

I will do another boost leak test.

Before when I did the boost leak test I didn't know this is normal or not but I noticed air coming out of the oil stick and the valve cover breather (a little hole on the size of the valve cover)

 

[SFRacingGST]

Its normal if you did the test from your turbo inlet (bet you heard oil gurgling in your pan too). Start closest to the TB and work your way back.

 

[The_one]

Thank you so much for all your help guys.

I finally figured out the problem. The current rpm at idle is 900 rpm.
What I did was change the 1g TPS to 2g TPS and I changed the bottom half of the 1g throttle body to the 2g . It solved my problem.