T-body causing bouncing idle?

[formula driver]

Ive had a problem with my idle and Im yet to find out whats causing it. I was having a problem with my t-body staying stuck open so I switched to one from a newer m20. Mines the 87 m20 and I used one from a 90 m20. Theres only one hole for a vacuum connection on the firewall side of the t-body so I just left one of the vacuum lines disconnected. It was fine for a few months that it started ideling weird. The idel would bounce from about 1800-2200 rpm. Could this be my problem? Also could a bad t-body gasket or bad valve cover gasket cause this? Thanks

[PeaveyBassist]

You left a vacuum hose off and basically caused a vacuum leak and youre asking why your idle is weird?

Will

[bwanac]

Your idleing at 1800rpm?

[bwanac]

Everyone responds with a question?

[PeaveyBassist]

Everyone responds with a question?

Are you sure?

Will

[formula driver]

Your idleing at 1800rpm?

Its a steady bouncing from 1800-2200 RPM so yes.

The reason I asked Will is because it drove fine for months with it like that, I also put my old t-body back on and it still was doing it. Would I just need to let the computer adjust to it. I only tried to turn it over twice but the idle was still jumping.

[drshoebocks]

Fix the vacuum leak, if that doesn't work, check the coolant temp sensor, which essentially plugs into the tstat body and tells the computer what the temp is.

[formula driver]

Fix the vacuum leak, if that doesn't work, check the coolant temp sensor, which essentially plugs into the tstat body and tells the computer what the temp is.

Could a coolant temp sensor have anything to do with a weird idel? You know I was talking about the Throttle body right?

[silversleeper]

mine does that only after hard driving... but steadys after a few seconds... is that the case for you?

[formula driver]

mine does that only after hard driving... but steadys after a few seconds... is that the case for you?

No...mine doesnt it right when I crank it than holds the steady bouncing.

[silversleeper]

disconnect ur O2... itll idle purrfect!

[formula driver]

disconnect ur O2... itll idle purrfect!

Bold statement...but Ill try it. Leave it unplugged or just unplug it and plug it back in?

[silversleeper]

unplugged... until u buy a new one.


btw... i love your rims, the same ones i wanted to buy not too long ago, but i want them in black with a polished lip in the widest size avail..

[formula driver]

unplugged... until u buy a new one.


btw... i love your rims, the same ones i wanted to buy not too long ago, but i want them in black with a polished lip in the widest size avail..

Cool....thanks.

Yea Im a big fan of my wheels. There getting 20mm spacers this week. Im sure I would love them in black but they have a nice finish to them right now so Im gonna rock them like this until I get bored of them then Ill spray the centers black or gunmetal and leave the lips polished and the bolts silver.

[vivalegreg]

did this help at all? did u end up fixing ur vacuum leak? what was the result cause my car is acting funny with idle too i think its a vacuum leak ijust replaced my coolant temp sensor but the 1223 light stays on now, after the idle calmed down...but 1223 is still staying on and i donno if its a bad sensor (even though i just replaced it and it seem to have fixed my idle problem) or if i have a vacuum leak...