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Something Fell Of My Car And I Dnt No Wat It Is

smcqueen89

By smcqueen89,
in General Maintenance

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smcqueen89 Collaborator

smcqueen89

Posted
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i looked in the engine bay and everything looks fine iv started the car im not sure if it was just laying around wit bits and pieces of the car of its vital to the car

its funny coz i just got the car last week and wen doing a service on it i have found parts just sitting in the engine bay eg turbo gasket

Nic_A31 Grand Master

Nic_A31

Posted
Posted (edited)

That's your AACV....car ain't going to idle or run without it....it should be mounted properly and hoses clamped on tight....very hard to beleive it just fell out.

Hopefully it was just another spare part laying around in the engine bay....

It mounts on your intake plenum around cylinders four and five, just below the throttle body.

Edited by Nic_A31
jiffo Mentor

jiffo

Posted
Posted

That's your Air Reg.(cold start fast idle valve)

Car will run fine without it PROVIDED the air hoses are re-connected properly.

Otherwise you'll have a huge air leak and she won't go.

My guess is it's been by-passed previously (aftermarket plenum perhaps) and finally decided to fall off.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

It could be blocked off in the past and hence not affecting the engine. If that "were" to fall out, you'll have massive misfires, idle problems as it loops into the plenum.

Those usually fail all the time on RB20DETs and mechanics just block them off.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

[quote name=ClutchBurndout-:(' timestamp='1300758954' post='5724847]

wait stop everything

u can block them off?

Correct, that's what mechanics so. Problem is sometimes on very cold days you might find you will need to slightly press down the accelerator to get the car to start.

The hose comes off the cross over pipe, into the AAC and back up into the plenum/TB. I've found out on several RB20s (including my previous car) that it was blocked off with a bolt.

Problem is when these AAC fail, no matter what you do, the idle is quite high. People often mistaken this for the IAC valve, spend hours adjusting idle, etc.

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