 Stupid question time, Where is it? |
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| skline |
 Mar 5 2005, 11:55 AM
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#1
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Born to Drive  Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California  |
Is there an idle adjustment screw on the stock 2.0 liter FI system? If so, where is it located? Its a 74 2 liter with factory FI. The idle is way too high and I need to set it down a little. Anyone??
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Replies(1 - 9)
| Engman |
Mar 5 2005, 11:58 AM
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#2
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Zoisite Group: Benefactors Posts: 1,349 Joined: 25-March 03 From: New Albany, IN Member No.: 475  |
Backside of the TB - hard to see.
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| mattillac |
Mar 5 2005, 12:49 PM
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#3
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robots! Group: Members Posts: 536 Joined: 27-October 04 From: vallejo,ca Member No.: 3,020 |
take off the air cleaner and you'll see a knurled screw with a spring on it on the side of the throttle body. also on the ECU theres and idle mixture knob
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| Aaron Cox |
Mar 5 2005, 12:50 PM
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#4
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
see scott....you dont know everything (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
BTW- valves are quiet |
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| skline |
Mar 5 2005, 12:55 PM
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#5
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
I am more of a carbs guy, this FI crap is a little new to me. I found the screw when I pulled off the aircleaner. It didnt have enough adjustment to bring it down much. I will try the knob on the FI computer
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| davep |
Mar 5 2005, 12:59 PM
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#6
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914 Historian Group: Benefactors Posts: 5,144 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
If you can't bring down the idle enough with the adjustment screw, then you have an air leak somewhere that needs to be fixed pronto. The idle adjustment on the computer should not be used for this purpose.
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| skline |
Mar 5 2005, 01:26 PM
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#7
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
Hmmm, so its a good thing I didnt just jump back on there and try adjusting it from there. I will look around and see what I can find. I notice if I put my hand over the Throttle body and cover the hole it really sucks my hand down and the idle drops to normal. Is this how it should be???
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| David_S |
Mar 5 2005, 01:39 PM
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#8
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Member Group: Members Posts: 430 Joined: 11-May 03 From: Dimmitt, Tx Member No.: 680 Region Association: Southwest Region |
If I am thinking right .....the engine should die when you cover the throttle body because you have cut off the air intake into the engine. If the idle is normal and the engine keeps running with the throttle body covered .....then you are letting air in from another source, such as a vacuum leak. I may be wrong, but if I remember correctly, that is how it should be .....
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| Engman |
Mar 5 2005, 01:44 PM
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#9
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Zoisite Group: Benefactors Posts: 1,349 Joined: 25-March 03 From: New Albany, IN Member No.: 475 |
Pull the tube from the air cleaner to the Aux Air Reg. These are notorious for sticking and being bad. Cover the hole. See if your idle drops.
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| mattillac |
Mar 5 2005, 06:25 PM
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#10
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robots! Group: Members Posts: 536 Joined: 27-October 04 From: vallejo,ca Member No.: 3,020 |
sounds like you have one or more significant vacuum leaks. replace:
intake gaskets all vacuum tubes TB gasket runner to plenum tube things injector seals the rubber thing that connects the air box to the TB that will make your life easier. then make sure you set the timing and dwell and the adjust valves and car is nice and warm before you bother setting your idle speed. then when your car runs shitty, you can start blaming sensors and stuff. |
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