Stumbly rough idle.

[Perseverance 11NW]

so i finally got my new to me 87 GN on the street. TT chip, egr delete, 60 injectors, exhaust and cold air intake. The scan master shows iac at 02. Is this normal?

 

[mr84ss]

No its not. What is your tps #

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[Perseverance 11NW]

No its not. What is your tps #

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46

 

[Perseverance 11NW]

What would a low iac number indicate?

 

[Karma 87]

Iac try to be around 19

With tps between 43-46

 

[Karma 87]

Both are going GN to be adjusted at the same time.

You know how to?

 

[Karma 87]

What would a low iac number indicate?

That most likely the throttle plate it’s opened too much

Hopefully nothing more

 

[Perseverance 11NW]

Both are going GN to be adjusted at the same time.

You know how to?

No i dont. In car right now, how do i adjust them?

 

[Karma 87]

With that little bitch right there

 

[Karma 87]

Back it out some a few turns

And check the iac number again

Let me know what happens

 

[Karma 87]

You know how the adjust your tps?

 

[~JM~]

IAC Adj:
http://www.vortexbuicks-etc.com/iac_adjustment.html
http://www.vortexbuicks-etc.com/basics.htm#IAC (Idle Air Control) Adjustment

TPS Adj:
http://www.vortexbuicks-etc.com/tps_adjustment.html
http://www.vortexbuicks-etc.com/basics.htm#Throttle Position Sensor Adjustment

Read & Bookmark these links:
http://www.vortexbuicks-etc.com/index.html
http://www.vortexbuicks-etc.com/basics.htm

 

[Karma 87]

you adjust your TPS with the two screws on the sensor loosen them up and it will move up and down.
Watch the Scanmaster .
You can have the car on when you’re doing this doesn’t fucking matter

 

[Karma 87]

Car needs to be hot when setting up the iac

 

[Perseverance 11NW]

IAC Adj:
http://www.vortexbuicks-etc.com/iac_adjustment.html
http://www.vortexbuicks-etc.com/basics.htm#IAC (Idle Air Control) Adjustment

TPS Adj:
http://www.vortexbuicks-etc.com/tps_adjustment.html
http://www.vortexbuicks-etc.com/basics.htm#Throttle Position Sensor Adjustment

Read & Bookmark these links:
http://www.vortexbuicks-etc.com/index.html
http://www.vortexbuicks-etc.com/basics.htm

Thank u. Very valuable info for me in these links.

 

[dank GN]

Set the IAC then the tps . Open the throttle blade to lower the IAC number close it to raise them . With the screw that was circled in a pic

 

[Perseverance 11NW]

Set the IAC then the tps . Open the throttle blade to lower the IAC number close it to raise them . With the screw that was circled in a pic

Thank u, will do. On a sidenote. Is itjust the nature of these cars to have a harsh vibration and rough feel while idling? My car doesnt seem very smooth.

 

[Karma 87]

Nope
When running well and especially in stock form.
They run and drive like a Cadillac

 

[TurboBuRick]

If the IAC was good but is now low, that would indicate a vacuum leak.

 

[Perseverance 11NW]

If the IAC was good but is now low, that would indicate a vacuum leak.

I do notice the egr block off isnt sealing very well. Is there a better way to block it off ?