Have a high idle

[Xeiros]

I'll be driving and after I pull out of gear and into neutral, it used to go down to about 1k, but now it slinks down to about 2k or so and hoovers around there until I'm at a complete stop generally.

Is it air getting past my throttle body? I have replaced it recently, so I'm thinking it might not be sitting properly on the gasket or something. Am I on the right track? Thanks.

[rixGAphx]

You have no 'Check Engine' light, or you would have said so.
So, the Powertrain Control Module (PCM, the engine-tranny 'puter) isn't getting any 'wrong' signals from the various sensors that would cause a code to be set.

A vac leak, such as the throttle body or an HVAC vacuum line/fitting/device is a possible candidate, since the PCM doesn't monitor or report on vac leaks.
But vac leaks usually produce only a bad, irregular idle; not a high and smooth idle.
If the vac leak is bad enough, the O2 sensor would sense the 'leanness' and the PCM *might* overcompensate and put in enough fuel to run 'normal' but very high and smooth.

The PCM also doesn't monitor or report on Fuel Pressure.
If the Fuel Pressure Regulator (FPR) is faulty, it can cause both a vac leak AND high fuel pressure; together these would produce a high, smooth idle speed.
The FPR is located on the end of the fuel rail, passenger side; kinda 'tin-hat' looking thin with a vac line to it.
If the diaphragm inside punctures, then sucking on the tube gives you a mouthful of gas vapors (or liquid gas :eek: ).

It *might* be caused by a bad Idle Air Control valve (IAC), but that IS monitored by the PCM and usually throws a code.

Hope this helps,
-Rick

[Xeiros]

I could possibly that, but I would think it has something to do with the throttle body itself, since before it was replaced, it never did it, and after it was replaced, it does.

[rixGAphx]

Originally posted by Xeiros
It could possibly that, but I would think it has something to do with the throttle body itself, since before it was replaced, it never did it, and after it was replaced, it does. OK.

[Xeiros]

Lol, what do you mean ok? :P

Does that mean the vacuum leak would be the most likely culpret? I did have a pain in the ass time getting one of the lines off my old TB. Think I might have punctured it, and that be the problem?

[rixGAphx]

Could definitely be a mis-installed throttle body, which would result in a vacuum leak.

Or a punctured line, or loose fitting.
Check the vac reservoir (black plastic grapefruit-sized ball under the battery) and the tubing to it.

It could be vac or fuel pressure, IMO.

Vac leaks are easy to DIY check using a spray can of Winter Starting Fluid.

Fuel pressure requires a mechanic with proper tools to check.

So start with the easy-to-check stuff, and proceed from there.

[daman]

Why did you replace the TB????

[Xeiros]

I changed it because I got a bigger bore TB. And I did finally throw a code. Seems the IAC might be the culpret after all.

[daman]

Originally posted by Xeiros
And I did finally throw a code. Seems the IAC might be the culpret after all. [/B]

well i guess that's a good thing,at least you know where the
problem is now...