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I replaced my throttle body yesterday with a spare I had lying around. My throttle body had a couple of nice vacuum leaks in it, so rather than fix the seals, I decided to replace the seals on my spare and just swap TBs.

Yeah, I guess that didn't go so well.


Traffic was light this morning, so I guess my car decided that I could use a bit more of a challenge this morning. I get 1/4 of a mile away from my apartment and I notice the RPMs want to keep rising after I take my foot off of the gas. Interesting.

I must be some kind of extraordinary dumbass. I have a spare car, so I could have turned around at that point, switched cars, and enjoy a nice, leisurely drive in my 3000GT.

But no. I like a challenge. I thought "eh, it will probably work itself out in a minute or two." Well, it didn't. In fact, it got progressively worse. But hey, I made it to work without A) crashing my car, or B) hitting fuel cut.

My afternoon commute should be very interesting. The throttle doesn't stick every time, and I think I've gotten pretty good handle on quick shifting and breaking. I can just use the gearing to lower the engine speed while the butterfly plate closes.

I guess I should have tested it yesterday for more than a quick trip around the block. Oh well.

Any windex where you work, it might just need a quick clean and lube. Windex would probably do a moderate job at this. I know I have used it for both a cleaner and a lubricant. As well it evaporates nicely so you dont have to worry about any water in your throttle body.

Oh, and to add to the wonderfulness that has been my morning, my car is apparently leaking water/coolant. I stopped at Dunkin Donuts to get breakfast, and when I get back to the car I noticed two puddles of water underneath.

Now, I did top off the water on Friday afternoon, so it is probably just overflow. I didn't drive the car much this weekend, but I would have thought I had gotten it up to normal operating temps. In either case, I didn't have much time to look into it. The oil temp guage read between 200 and 210 this morning (normal for me). The office was just a few blocks away at that point, so I figured I would deal with it later.

But yeah, its been a fun morning. Sometimes, this car is just way to frustrating.

[quote=""EvilNCarnate""]Any windex where you work, it might just need a quick clean and lube. Windex would probably do a moderate job at this. I know I have used it for both a cleaner and a lubricant. As well it evaporates nicely so you dont have to worry about any water in your throttle body.[/quote]

I sprayed the butterfly valve with liquid wrench before I installed it yesterday. I would have thought that that would help lubricate it.

possibly the spring?

if you hook your toe underneath the gas pedal and pull back up, doesn't that work?

[quote=""Neo""]possibly the spring?

if you hook your toe underneath the gas pedal and pull back up, doesn't that work?[/quote]

Nope, tried that. I'm pretty sure it is related to the throttlebody itself. Yesterday morning it worked fine (before the swap).

yeah, i meant the coil spring that springs the throttle body back to closed... try lubricating that and flexing it a couple times...could be brittle

The coil would sprint the butterfly valve closed when I had the throttlebody outside of the car. Inside... hard to tell. I think the butterfly plate is springing back into position, but not springing back all of the way. I think it is remaining cracked by a few milimeters. Hard to say.

Rather than dick around with it too much, I'll probably just swap the old one back in (after replacing the leaking seals, of course).

true that

If your car is low on coolant your motor will rev high from there being a lack of coolant in the throttle body. Our TBs have a FIAV to allow more air past the throttle plate while the motor is cool. As the coolant heats up, the FIAV closes and brings the idle down to normal.

I'd be willing to bet you cut one of those coolant lines when you swapped TBs.

[quote=""Monochrome""]If your car is low on coolant your motor will rev high from there being a lack of coolant in the throttle body. Our TBs have a FIAV to allow more air past the throttle plate while the motor is cool. As the coolant heats up, the FIAV closes and brings the idle down to normal.

I'd be willing to bet you cut one of those coolant lines when you swapped TBs.[/quote]

The coolant lines to the TB have been long since plugged, capped, and deleted.

I checked the coolant last night and the reservoir level was fine. It was just overflowing some of the extra coolant I put in on Friday. I probably didn't run the engine long enough to overflow at any point this weekend.

I also adjusted the throttle body springs last night. I wrapped both springs around one more time. Now, the throttlebody snaps back very quick. Actually it feels like there is more tension than before I started, so I may need to readjust the springs again. If all else fails, I have the original throttlebody in my trunk. But for now, the car drives as normal (with the exception of the gas petal being *maybe* a little bit harder to push).

That's odd, with no coolant going thru the TB, the FIAV should always be open giving you the high idle all the time. Unless that's deleted too...?

No, its not deleted. And yes, I get high idle all of the time. I'm okay with that. Before deleting the coolant lines, I kept the idle high anyway.

Well, there's your problem. Block off the passageway for the FIAV in the throttle body and the car should run normally.

[quote=""Monochrome""]Well, there's your problem. Block off the passageway for the FIAV in the throttle body and the car should run normally.[/quote]

No, that's not a problem for me. Like I ran the idle higher than stock long before capping the coolant lines. Deleting the coolant lines essentially did nothing for my idle.

The FIAV coolant lines have been removed for about 9 months. The problem this week started immediately after replacing the throttle body. Rotating the two tension springs another 360* resolved it.

Kinda on topic (I'm sorry):

Why is it that people think deleting the coolant lines will make the car idle high? I drove my car through two winters with no coolant lines, and my idle acted just the same as it would when it had the lines. My car idles at about 750ish (I would set it lower but then the poly mounts become annoying), and on cold start never goes about 1000rpm. On really cold morning it would go to about 1200rpm, but would come down to normal within 5 minutes of driving. I also no others who have pulled those lines and never had an issue. Is it something a few have had issues with or is it yet another 3S "I know what I'm talking about" piece of misinformation that started years ago?

The only logical explanation is ISC is probably able to make up for open FIAV.

[quote=""Jeremy C""]Kinda on topic (I'm sorry):

Why is it that people think deleting the coolant lines will make the car idle high? I drove my car through two winters with no coolant lines, and my idle acted just the same as it would when it had the lines. My car idles at about 750ish (I would set it lower but then the poly mounts become annoying), and on cold start never goes about 1000rpm. On really cold morning it would go to about 1200rpm, but would come down to normal within 5 minutes of driving. I also no others who have pulled those lines and never had an issue. Is it something a few have had issues with or is it yet another 3S "I know what I'm talking about" piece of misinformation that started years ago?[/quote]

I did not noticed the idle increase when I removed the coolant lines. Of course (as stated before), I used a higher idle to begin with.