1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Change in idle?

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Old 01-30-10, 11:12 PM
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Rotory United RU.

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Change in idle?

So I posted about a week ago some pic's of my leaking coolant hose and asked how to fix it. Thanks to the people that helped me, i swapped it out for a new one. I bought the hose from auto zone and just sized it up, i even left it little longer so it can have room to circulate properly. Now after the new hose my car idles at like 1,200 when before it was doing about 800-900 rpm why the change, It was just a coolant hose?

Here's the hose i changed. Now mind you the new hose is about 6 inches longer but i don't see how that would make a difference.





Old 01-31-10, 01:18 AM
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Throttle cable looks a little loose in the 3rd pic. Perhaps you moved something in the fast idle system on the throttle body. Did you change, remove/replace or adjust anything to renew the coolant hose?
Old 01-31-10, 09:27 AM
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Originally Posted by trochoid
Throttle cable looks a little loose in the 3rd pic. Perhaps you moved something in the fast idle system on the throttle body. Did you change, remove/replace or adjust anything to renew the coolant hose?
i didn't move anything but my throttle cable i a little looses should i tighten it up. how do i do that?
Old 02-01-10, 11:53 AM
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I don't think its the cable.. I think it has to do something with that little white tube u see next to the hose. My guess is that i put a longer house so that senser is reading differently now. My guess is that, that peace reads how much anitfreeze is entering the intake manifold when i first turn on the car. Kinda like to warm the car up faster at start up. (Automatic Choke)
Old 02-01-10, 01:34 PM
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air bubble in the hose? that hose goes to the thermowax, which gives the car its fast idle in the morning, if there is an air bubble there, the thermowax never warms up and idle never drops.
Old 02-01-10, 04:41 PM
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I was wondering about the thermowax also, but it looks like it has pulled in, which is the warm state iirc. You may want to check the 85 FSM on testing the thermowax. If there's an air bubble, it may be as simple as loosening the thermowax till coolant runs out.
Old 02-02-10, 01:40 AM
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Originally Posted by trochoid
I was wondering about the thermowax also, but it looks like it has pulled in, which is the warm state iirc. You may want to check the 85 FSM on testing the thermowax. If there's an air bubble, it may be as simple as loosening the thermowax till coolant runs out.

okey ill take a look. never herd the term tho. Sounds like a new kind of paintfull body waxing or something.. ha ha
Old 02-04-10, 12:56 AM
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The thermowax is that off white plastic part you mentioned earlier.
Old 02-05-10, 10:37 AM
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Originally Posted by trochoid
The thermowax is that off white plastic part you mentioned earlier.

Okay i see as soon as it warms up out side ima give it a try. Thanks a lot guys, ill keep you posted.
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