High idle (Page 6/6)
Scuba_steve45 SEP 21, 10:33 PM
I’m pretty confident I could do it after thorough research. Even if I do mess it up I’ve got a buddy that’s great with these types of things. Where could I purchase a rebuild kit?


quote
Originally posted by 82-T/A [At Work]:
How comfortable are you with rebuilding the TBI unit? There's a rebuild kit that's about $50 bucks... it's not hard at all to do. I'd just buy some brake cleaner and after disassembling it, I'd blast the heck out of it.
Scuba_steve45 SEP 21, 11:22 PM
I will start looking online for the gaskets and stuff and get to cleaning soon! Thank you!


quote
Originally posted by Patrick:

If the IAC valve was gummed up with crud and it couldn't close, you in essence did have a vacuum leak, as a surplus of air was being allowed to enter the intake system. I bet dollars to donuts that a lot of that grit we see in your photo of the TBI has worked its way into the IAC system, and resulted in the valve becoming stuck in an open position.

If it was my engine, I'd be removing the TBI unit to thoroughly clean it, as I wouldn't want to be washing grit out of the TBI unit and into the intake and eventually into the combustion chambers.
82-T/A [At Work] SEP 22, 07:55 AM

quote
Originally posted by Scuba_steve45:

I’m pretty confident I could do it after thorough research. Even if I do mess it up I’ve got a buddy that’s great with these types of things. Where could I purchase a rebuild kit?





Ok, here is the "Rebuild Kit": https://www.rockauto.com/en/moreinfo.php?pk=46920 ($39)

I put that in quotes because it doesn't really include everything, it only includes the gaskets, really.


You will likely also want the pressure regulator kit as well, which unfortunately seems to be like $40 buck by itself: https://www.rockauto.com/en/moreinfo.php?pk=46993

And if you want, you can also replace your fuel injector while you're in there... price ranges from $60 to $120 depending on if you buy new, or a rebuilt one with a core return: https://www.rockauto.com/en...r,fuel+injector,6224

But honestly... this is one of those times where you want to figure out where you want to go with this. The car runs pretty well right now, so maybe you just fix what's broken when it breaks... but for me, I tend to go a little overboard.


I know you said you did some maintenance on it... but if you haven't already, I'd replace the fuel filter (I didn't see where you said you'd done that). I would also put back the factory air cleaner. It's going to be much better than an open-element air cleaner. If you want to get a little better air flow, you can knock out the "water separator" in the air box. You remove the little grill on the side of the Fiero, and then carefully shove a hammer handle in there, it knocks out the piece of plastic that's used as a water baffle. You can also get this from Rodney Dickman: https://rodneydickman.com/p...o.php?products_id=70

... it eliminates the water separator (not really needed, to be honest), and you get fresh air directly from a higher pressure zone on the side of the car. You're likely losing some power / drivability by having an open-element air cleaner in the hot engine back. It would be different if it was a front-engined car where the cool air was directly flowing into the engine compartment.

[This message has been edited by 82-T/A [At Work] (edited 09-22-2024).]

Scuba_steve45 SEP 28, 05:15 PM
Thank you for the links! I did already replace my fuel filter but thank you anyway! I also like to go all out when maintaining my vehicles lol. It always starts out with “well I might as well do that while I’m in there” lol

EDIT: I did the open air cleaner bc of the look and the sound, I know it’s much less effective than the original.


quote
Originally posted by 82-T/A [At Work]:
Ok, here is the "Rebuild Kit": https://www.rockauto.com/en/moreinfo.php?pk=46920 ($39)

I put that in quotes because it doesn't really include everything, it only includes the gaskets, really.


You will likely also want the pressure regulator kit as well, which unfortunately seems to be like $40 buck by itself: https://www.rockauto.com/en/moreinfo.php?pk=46993

And if you want, you can also replace your fuel injector while you're in there... price ranges from $60 to $120 depending on if you buy new, or a rebuilt one with a core return: https://www.rockauto.com/en...r,fuel+injector,6224

But honestly... this is one of those times where you want to figure out where you want to go with this. The car runs pretty well right now, so maybe you just fix what's broken when it breaks... but for me, I tend to go a little overboard.


I know you said you did some maintenance on it... but if you haven't already, I'd replace the fuel filter (I didn't see where you said you'd done that). I would also put back the factory air cleaner. It's going to be much better than an open-element air cleaner. If you want to get a little better air flow, you can knock out the "water separator" in the air box. You remove the little grill on the side of the Fiero, and then carefully shove a hammer handle in there, it knocks out the piece of plastic that's used as a water baffle. You can also get this from Rodney Dickman: https://rodneydickman.com/p...o.php?products_id=70

... it eliminates the water separator (not really needed, to be honest), and you get fresh air directly from a higher pressure zone on the side of the car. You're likely losing some power / drivability by having an open-element air cleaner in the hot engine back. It would be different if it was a front-engined car where the cool air was directly flowing into the engine compartment.


[This message has been edited by Scuba_steve45 (edited 09-28-2024).]

82-T/A [At Work] SEP 28, 05:29 PM

quote
Originally posted by Scuba_steve45:

Thank you for the links! I did already replace my fuel filter but thank you anyway! I also like to go all out when maintaining my vehicles lol. It always starts out with “well I might as well do that while I’m in there” lol

EDIT: I did the open air cleaner bc of the look and the sound, I know it’s much less effective than the original.





I had a Porsche 944 once. I went to go replace the windshield wipers... $7,000 later... I realized that I probably should have just replaced the windshield wipers.

By the way, I'm really curious what it sounds like with an open-element air filter. Holley made a "performance" air cleaner lid that also came with a base... but most people simply used the new lid with the old air cleaner assembly. That allowed for the sound, some additional air, and still pulling in some of the cold air from the side of the car. Might be worthwhile looking into. You just need to order a slightly smaller air cleaner lid and keep the same bottom ... or is that what you did?
Scuba_steve45 SEP 28, 06:02 PM
I just cut up the original air cleaner with an angle grinder and a dremel. I am planning on replacing the top of it with a chrome lid and polishing the bottom lid to semi-match. I’ll upload pics when I’m done!


quote
Originally posted by 82-T/A [At Work]:
I had a Porsche 944 once. I went to go replace the windshield wipers... $7,000 later... I realized that I probably should have just replaced the windshield wipers.

By the way, I'm really curious what it sounds like with an open-element air filter. Holley made a "performance" air cleaner lid that also came with a base... but most people simply used the new lid with the old air cleaner assembly. That allowed for the sound, some additional air, and still pulling in some of the cold air from the side of the car. Might be worthwhile looking into. You just need to order a slightly smaller air cleaner lid and keep the same bottom ... or is that what you did?
Scuba_steve45 SEP 28, 06:03 PM
I just cut up the original air cleaner with an angle grinder and a dremel. I am planning on replacing the top of it with a chrome lid and polishing the bottom lid to semi-match. I’ll upload pics when I’m done!


quote
Originally posted by 82-T/A [At Work]:
I had a Porsche 944 once. I went to go replace the windshield wipers... $7,000 later... I realized that I probably should have just replaced the windshield wipers.

By the way, I'm really curious what it sounds like with an open-element air filter. Holley made a "performance" air cleaner lid that also came with a base... but most people simply used the new lid with the old air cleaner assembly. That allowed for the sound, some additional air, and still pulling in some of the cold air from the side of the car. Might be worthwhile looking into. You just need to order a slightly smaller air cleaner lid and keep the same bottom ... or is that what you did?