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Va914's Avatar
 
Join Date: Jul 2000
Location: Williamsburg, VA
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Idle screw adjustment and noise Q's?

After fixing some problems with my FI system I decided to adjust the idle last night.

As I backed off the idle screw a loud "sucking" (NO. the wife was inside ) noise came from the throttle body. Is this normal?

Opps.. I have a '74 2.0L with the D-jet FI

Cheers
Kerry
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Kerry (Back on the road, sort of)

914-6 in the Werks

Last edited by Va914; 09-30-2003 at 09:51 AM..
Old 09-30-2003, 08:45 AM
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Garage
yup!
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Jeff Keyzer
72 914 w/2056 built by Mark DeBernardi @ Original Customs
Megasquirt with MSII upgrade
Old 09-30-2003, 09:37 AM
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Kerry, the idle screw is an air bleed valve, the more air it sucks, the more fuel.

How is your idle now?


M
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Old 09-30-2003, 10:21 AM
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The idle is better now. Before I fixed some things I had the bleeder screw in as far as it would go. My AAR was not closing. I think I have that solved now. I took the AAR apart and got things moving again.

I adjusted the idle to about 1800-2000 RPM when cold. I figure when the AAR closes the idle will drop down to 900 RPM.

Back to the Q

The scew was 100% closed for the longest time. Since things are getting fixed I need to open the bleed. The sound is new to me and LOUD to me as well.

Now you know too much, hu?
Thanks
Kerry
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Kerry (Back on the road, sort of)

914-6 in the Werks
Old 09-30-2003, 10:46 AM
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You need to adjust the idle when the car is hot. If the screw was all the way in, and idle was acceptable, I think your ECU is set rich.

My ECU was set very rich until I got a grip on this yesterday, it was somehow set nearly a FULL TURN off of where it is supposed to be.

Just keep that in mind also..

If you are getting too much RUSHING noise (air bleed) make sure your airbox is properly mated to the throttle body, it can be loose.


M
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Old 09-30-2003, 10:57 AM
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I'll check those out.

I think I have my ECU idle knob set 1/2 way between rich/lean.

Thanks again.
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Kerry (Back on the road, sort of)

914-6 in the Werks
Old 09-30-2003, 11:45 AM
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Sure.

If you see the marks, set it right there 1st thing.

Make a note of where it is now.

I am 1 click over factory on my 74 as of yesterday morning, the plugs had been fouling slightly from it, more than slightly.. car ran miserably all the time because of the rich idle, now it runs very nicely.


M
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Old 09-30-2003, 12:19 PM
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