Throttle body outlet/inlet not connected - D-series.org

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Old 11-17-2015, 04:09 AM   #1 (permalink)
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Default Throttle body outlet/inlet not connected

I was experiencing some rough idling occasionally, so I took a look.
I found this:-



any idea where this outlet(or inlet) should be connected?

Thanks.
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Old 11-17-2015, 04:25 AM   #2 (permalink)
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It doesnt need to be connected unless you drive the car in brutally cold weather, like sub zero temps. What idle issues are you having?
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Old 11-17-2015, 06:04 AM   #3 (permalink)
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what motor?
It looks obd0.


But that should be the FAST IDLE Air Control.
Its use for keeping the idle high when it cold outside.

That tube should connect to the intake manifold or coolant pipe on the back of the block.
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Old 11-17-2015, 10:44 AM   #4 (permalink)
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I'm going to assume that's a 3rd Gen zc. No fast idle throttle valve. Those nipples are coolant passages for the throttle body like previously stated.

Idle issues can be caused by a multitude of things.
So o.p. you have ALOT of info to hand out.

What ecu are you running
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Old 11-17-2015, 03:54 PM   #5 (permalink)
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Thanks guys, it is a 3rd gen ZC (or D16A9) depending on where you are.
Car is on OBD0.
The car is idling at about 1200rpm now, and sometimes the engine will "skip" a beat whilst waiting at the lights regardless whether the A/C is on or off.
I need to crank the engine for about 4-5secs before the engine starts.
I have replaced the IACV but the symptoms persist.
And, my throttle is bored to 58mm.
Thanks for advising.
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Old 11-17-2015, 05:51 PM   #6 (permalink)
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If you had some vac leak, your WARM idle would be over 900 rpm. Cold would be over 2000, presuming that's a cold-idle "dashpot" connected to the TB pulley. 1200 rpm is too high, but it won't be causing the misfire (if that's what a "skip" is).

Sounds like it could be more of an ignition or fuel issue. If one (or more) injector is clogged, one cylinder will run lean while the other 3 run slightly rich & lead to lean misfire. If it's ignition issue causes a misfire, it will miss and pop after that unburnt fuel enters the exhaust.
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Old 11-18-2015, 03:47 AM   #7 (permalink)
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Quote:
Originally Posted by HiProfile View Post
If you had some vac leak, your WARM idle would be over 900 rpm. Cold would be over 2000, presuming that's a cold-idle "dashpot" connected to the TB pulley. 1200 rpm is too high, but it won't be causing the misfire (if that's what a "skip" is).

Sounds like it could be more of an ignition or fuel issue. If one (or more) injector is clogged, one cylinder will run lean while the other 3 run slightly rich & lead to lean misfire. If it's ignition issue causes a misfire, it will miss and pop after that unburnt fuel enters the exhaust.
Thanks. I will check the ignition and injectors.
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