420a idleing problem

[BOOST REQUIRED]

I just rebuilt the upper end of a 97 esi for my girlfriend.. i drove it a lil bit and it seems to idle way high from time to time.. will a broken pcv valve line or vacuum leak cause this.. she doesnt remember if it had that problem before.. i noticed that that box that bolts to the intake mani stays has a hole in it also.. lemme know what you guys think.. and i already adjusted the throttle cable its good!

 

[BOOST REQUIRED]

Does anyone have any suggestions?

 

[chadnum1]

I dont remember if the NT have an ISC or not. But yes a vacuum leak can cause erratic idle. Did you do a compression check after the install to make sure it all sealed properly?

 

[BOOST REQUIRED]

I dont remember if the NT have an ISC or not. But yes a vacuum leak can cause erratic idle. Did you do a compression check after the install to make sure it all sealed properly?

What's an isc? I did not do a compession test afterward..

 

[chadnum1]

ISC=idle speed controller. Little sensor that controls idle. Turbos have them not sure about the non turbo though.

 

[chadnum1]

Ok just looked it up you do have an ISC. its gonna be on your throttle body.

 

[BOOST REQUIRED]

ISC=idle speed controller. Little sensor that controls idle. Turbos have them not sure about the non turbo though.

where is it normally located? i dont have the car here but after tearin it apart and putting it back together i remember everything on that engine..

 

[chadnum1]

On the turbos its under the throttle body by the firewall. Might be the same for non turbos. Look at the throtle body itll be a sensor with two screws or bolts holding it on,

 

[Venom1515]

If you check your throttle body its the sensor below the TPS

 

[Venom1515]

be really careful unbolting they tend to snap

 

[chadnum1]

Whew a non turbo guy to the rescue

 

[BOOST REQUIRED]

Whew a non turbo guy to the rescue

.. maybe he does both like me.. im just not a specialist..

 

[chadnum1]

I actually started with a non turbo but that was like 10 years ago and its been turbos ever since. Dont remember alot

 

[BOOST REQUIRED]

be really careful unbolting they tend to snap

i'm not gonna take it loose.. would'nt a scan tell you if that was bad? i did a scan cause the ce light kept comin on. the only thing it said was vacuum leak which half of it got fixed, { the vc hose to tb}, and vss which i already knew was'nt connected.

 

[Venom1515]

yeah I mess with both turbo and non turbo, i got a 95 non turbo project that i've been working on for a while now almost complete as the idle air it should show up a code, check all vacuum lines, even check the connectors or wires

 

[Jesse420]

i'm not gonna take it loose.. would'nt a scan tell you if that was bad? i did a scan cause the ce light kept comin on. the only thing it said was vacuum leak which half of it got fixed, { the vc hose to tb}, and vss which i already knew was'nt connected.

Did you already check the "egr" line for leaks? that happen to me twice,