Hunting idle issue

[MuRCieLaGo]

Originally Posted by XfireZ51

If it was in the fuel pressure regulator hose, it should not have been. It was blocking vacuum to the FPR and so not allowing correct fuel pressure.

Question is why would someone do that?

So you're saying I should have left it there? I just threw it away... I don't get it. Could it be related to my issue? Do you think I can get another one at the dealership, or somewhere else?

[A26B]

Originally Posted by MuRCieLaGo

So you're saying I should have left it there? I just threw it away... I don't get it. Could it be related to my issue? Do you think I can get another one at the dealership, or somewhere else?

This was someone’s idea of how to increase fuel pressure, by blocking the fuel pressure regulator vacuum source. Probably thought it might result in more power.
Toss the foreign piece & reinstall the vacuum hose.


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[XfireZ51]

By blocking the plenum vacuum to the FPR, fuel flow would be inconsistent throughout the range of engine vacuum resulting in either too much or too little fuel.

[MuRCieLaGo]

Alright! I don't like to see that kind of stuff on my car. I hope I won't find other stupid mods like this!

Thanks guys!

[jss06c6]

What the hell?? Sabotage?? No rational reason unless some other means of fuel management is installed.

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[MuRCieLaGo]

Originally Posted by Ccmano

Ok, as Haibeck says (and I believe Hib too)... high idle is caused by a vacuum leak 99% of the time. In my opinion messing with the “min air adjustment” is a last resort and you need at least a Tech 1 scanner to do it. For your idle to change suddenly after a plenum pull still indicates a leak. The only way I would suspect the throttle body (requiring a min air adjustment) is if you wiped away the DAG sealing compound around the secondary throttle Plates thinking it was dirt build up. Another member here had fun with that one.

I would start here with Haibecks write up.

http://www.zr1specialist.com/HAT%20W...5%20Engine.pdf

H

WAIT!

is if you wiped away the DAG sealing compound around the secondary throttle Plates thinking it was dirt build up

I did that! I removed that plate because I thought I had to remove the plate to remove the plenum. The gasket there was super-worn and there was some coolant coming out of there if I remember. Could this faulty gasket cause all that mess? Hopefully Jerry sells it!

[XfireZ51]

Originally Posted by MuRCieLaGo

WAIT!

is if you wiped away the DAG sealing compound around the secondary throttle Plates thinking it was dirt build up

I did that! I removed that plate because I thought I had to remove the plate to remove the plenum. The gasket there was super-worn and there was some coolant coming out of there if I remember. Could this faulty gasket cause all that mess? Hopefully Jerry sells it!

Once u have removed the throttle plate, its difficult to get it properly seated again in the venturi. Ask me how I know. Finally sent the throttle body to Marc to have the TPs correctly positioned in the throttle bores.

If you meant “throttle body” and not throttle plate, disregard above.

[MuRCieLaGo]

Originally Posted by XfireZ51

Once u have removed the throttle plate, its difficult to get it properly seated again in the venturi. Ask me how I know. Finally sent the throttle body to Marc to have the TPs correctly positioned in the throttle bores.

If you meant “throttle body” and not throttle plate, disregard above.

I meant #39 (in bold). That gasket is probably not sealing anymore. I wonder if it is what Ccmano meant.

I already ordered the gasket via Jerry's website but I wonder if it'll fix my problem.

[XfireZ51]

If I read this right, that gasket is for the coolant crossover in the throttle body.

[Ccmano]

The DAG is inside the throttle bores sealing the throttle Plates when closed. If you extend the line at #10 into the throttle bore, thats what I mean.
H