High idle (3% throttle)

[protecthishouse]

Alright so I took my tb apart to clean it up and swap in a non cruise control cable. Question is, idle is super high now (2,100rmp). Throttle on link and on my apexi neo both read 3% even when the cars off. Throttle cable has enough slack that it's not holding it open any. Maybe the throttle plate isn't closing all the way? What do y'all think?

 

[bryanwheat]

Alright so I took my tb apart to clean it up and swap in a non cruise control cable. Question is, idle is super high now (2,100rmp). Throttle on link and on my apexi neo both read 3% even when the cars off. Throttle cable has enough slack that it's not holding it open any. Maybe the throttle plate isn't closing all the way? What do y'all think?

Did you take the throttle plate out? Also why are you running link and an safc?

 

[Marchev]

It's possible that your throttle position sensor is not adjusted properly, that's why you're getting the 3% throttle. In link display your tpsvolts, it should be .62v. Loosen up the tps and adjust accordingly.

 

[Derail20T]

You can easily adjust the throttle position in link with the tpsadjust feature, however that doesn't explain why your Idle is so high. Is it idling that high when you first start it, or when it is warmed up? It seems like something isn't right with your setup. There is some additional air getting into the engine for the Idle to be that high.

 

[eclipsyco]

It's possible that your throttle position sensor is not adjusted properly, that's why you're getting the 3% throttle. In link display your tpsvolts, it should be .62v. Loosen up the tps and adjust accordingly.

Probably a typo man but is .63v not .62v actually is impossible to get that value. It goes as .61v .63v, .65v etc.
To the OP probably and since you removed the TB you moved the SAS screw which acts like a throttle stopper search around how to properly adjust it and the adjust your TPS. Only when is fully close it forces the ECU to idle at what ever value you have set it to. Check the biss screw too.

 

[protecthishouse]

Did you take the throttle plate out? Also why are you running link and an safc?

I didn't touch the throttle plate and I don't use the neo for tuning at all. Just to display throttle value, rpm's & battery volts.

 

[protecthishouse]

You can easily adjust the throttle position in link with the tpsadjust feature, however that doesn't explain why your Idle is so high. Is it idling that high when you first start it, or when it is warmed up? It seems like something isn't right with your setup. There is some additional air getting into the engine for the Idle to be that high.

I have attempted to adjust it in link, but once the car is running it bypasses it & returns to 3% throttle ALL the time. Never drops down.

 

[protecthishouse]

Probably a typo man but is .63v not .62v actually is impossible to get that value. It goes as .61v .63v, .65v etc.
To the OP probably and since you removed the TB you moved the SAS screw which acts like a throttle stopper search around how to properly adjust it and the adjust your TPS. Only when is fully close it forces the ECU to idle at what ever value you have set it to. Check the biss screw too.

How I do go about adjusting the SAS screw? If I remember correctly, that is the one inside by the tps, right?

 

[eclipsyco]

No, the SAS screw is under the throttle spring next to the ISC (on the other side of the TPS) the difference between the 2g and 1g TPS is that the 2g has a built in idle switch but in order to idle properly the TPS must read 0% throttle. To adjust the SAS screw you need a feller gauge loose the throttle cable enough to allow it to move freely (lot of slack) back up (unscrew) the SAS until you can fit the feller gauge between the throttle spring and the tip of the SAS screw. Sorry I can't provide you the exact size of the feller but I don't remember and is kinda hard to search with POS Phone I have. If you don't have a feller gauge another way to do it is to touch the tip of the SAS and back it up 1/2 turn.

 

[1990TSIAWDTALON]

It's possible that your throttle position sensor is not adjusted properly, that's why you're getting the 3% throttle. In link display your tpsvolts, it should be .62v. Loosen up the tps and adjust accordingly.

+2

 

[92AWDHX40]

check the throttle plate and make sure its closing all the way. Yes I get my tps around .63 or .65 its still good.

 

[bryanwheat]

Before adjusting the tps you need to have the throttle stop screw adjusted properly and verify that the throttle plate is closing all the way. The tps being out of asjustment usually will not make the car idle higher, as it is not introducing more air. The cause is likely the throttle plate being held open, and you are just noticing it thru the tps reading.

 

[livedsm4g63]

Throttle isnt closing all the way.

 

[protecthishouse]

Alright well what order should I be adjusting these so it idles all good? From the looks of it, I need to adjust my tps & sas in order to make sure the throttle plate is closing all the way.

 

[bryanwheat]

Alright well what order should I be adjusting these so it idles all good? From the looks of it, I need to adjust my tps & sas in order to make sure the throttle plate is closing all the way.

Adjust the set screw first according to the fsm than adjust the tps if it needs to be adjusted. Did you clean the carbon from inside the throttle bore when you had the tb off? If so than it was probably sealing the tb when the throttle plate was closed. Since you cleaned it now there is space around the butterfly for air to get past. After you get the screw adjusted than from there you can adjust the tps. You need to do it a little differently with a 2g tps than a 1g tps. You need to put a .017 feeler gauge between the stop screw and linkage than test for continuity at pins 2 and 3 (the 2 center ones) when you are adjusting the tps. You need to set it right at the point where it goes from no continuity to continuity. From there remove the feeler gauge and you are good to go. Because the 2g tps has the throttle closed switch built into it you can't really adjust with resistance readings or voltage like on a 1g. You are basically just making sure that the idle switch is opening once the throttle linkage moves .017 away from the stop screw. From here you can start it and than set the biss screw and get it idling properly.

 

[protecthishouse]

I'm awful with using link so be patient with me..how do I look at the tps voltage? Secondly, I've been adjusting the set screw but can only get it to drop down to .7%

 

[bryanwheat]

I'm awful with using link so be patient with me..how do I look at the tps voltage? Secondly, I've been adjusting the set screw but can only get it to drop down to .7%

That's because you aren't doing it right, and you aren't listening to what i am saying. Before anything you need to properly adjust the stop screw. Back the screw out and than start turning it until it hits the linkage. From there turn it in 1 and 1/4 turns. From there you are done with this step. Now use a multimeter to set the tps. You adjust the tps by loosening the mounting bolts and turn it.