2G High idle issues

[leonell243]

Having issues where at whatever temp range, I have a steady idle at around 1500rpm with a spark advance reading of 20-22°, sometimes idles at 1200 at 11-16°, but thats more rare. I’ve come across what seems to be a chewed up plastic biss, and a 1g tps (3 pin) on a 2g car (97 gst). And whats that little hard line venting to? Looks like it should go somewhere. I’ve already replaced coolant temp sensor (single wire connector), thermostat, maf, among a few other parts not related. Car drives *ok*. Slight buck occasionally when shifting, and very rarely I’ll get a tiny buck while in gear enough to almost feel like the tb closes, along with tiny bov flutter akin to when i let off at low boost.

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[92AWDHX40]

Start here please ide issues can be a number of things.

 

[leonell243]

Start here please ide issues can be a number of things.

Start where? Basically all im asking is if the 3pin 1g sensor will cause issues with a 2g car, and if there is any performance reason on why i should not just get a 2g sensor and replace the current sensor. And random hard line venting to atmosphere? Seems like it would cause issues with vacuum, and i would like to know if that line is supposed to be vented, or does it go to anything.

 

[92AWDHX40]

So just use a 2g sensor no need in making it harder than you need to. AGain idle issues can be a lot fo things. Performance its not going to improve anything use., whats the history on the car. is this a new issues. Have you adjusted the biss screw, any boost leaks, Is everything capped off of sealed meaning the tube you referenced to.

 

[chrisman287]

Get a 2g TPS and follow this:

2G - 2G TPS Test readings need help!

hello everybody, i took off my TPS and tested it today. It read 80 ohms and on the other pins it read 40 ohms. does this mean it is bad? i heard it was supposed to read between 3500 and 6500. Thanks in advance.

www.dsmtuners.com

I would get a new BISS screw w/ o-ring and set that correctly. Find out there that tube goes or cap it.

 

[jed344]

There is a hole list and how to on here about finding why a dsm is idling high / surging. Like said can be many things but usually ends up being a leak somewhere.

 

[leonell243]

Thank you, fellas. I'll look into replacing the TPS and referring to some vacuum diagrams.

 

[RamenPride]

Definitely start with the proper TPS. It contains the closed throttle switch on 2G's, so basically the ECU has no idea when the throttle is closed.

 

[leonell243]

Definitely start with the proper TPS. It contains the closed throttle switch on 2G's, so basically the ECU has no idea when the throttle is closed.

Yea that makes a lot of sense. When i first got the car i would idle at almost 2500 rpm until i started replacing basically every hose and coupler. I feel like im getting real close