idle speed when in drive ? - Mazda MX-6 Forum
 
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post #1 of 10 (permalink) Old 11-9-16, 7:32 Thread Starter
 
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idle speed when in drive ?

Books say the idle speed is when the car is at rest, such as a stop light, with no accelerator pressure.

In a car with an automatic, the idle speed lowers when the car is in drive and at rest, vs. in neutral and at rest. It can be as much as 600 rpm difference.

Which idle speed is correct ?
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post #2 of 10 (permalink) Old 11-9-16, 18:15
 
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In neutral (and warm engine) is the correct standard idle speed. Should be around 700rpm if I remember correctly.

But a 600rpm drop (unless it's a cold engine) when you put it in drive is far too much. That would stall the engine, if it's 700rpm in neutral.
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post #3 of 10 (permalink) Old 11-9-16, 20:35 Thread Starter
 
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I don't know, in D it idles at 900 rpm and happy. In N it idles at 1500.

I tried to turn the idle screw all the way down, and this is what it does.
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post #4 of 10 (permalink) Old 11-9-16, 21:24

 
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idle screw should never be fully closed. 3 quarter turns open, and set your throttle linkage, then set your tps, reset ecu, then let the ecu relearn the idle cycle

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post #5 of 10 (permalink) Old 11-11-16, 21:11 Thread Starter
 
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Maybe this is what you get when you take out a KLDE engine, and put back a KLZE engine with a KLDE intake manifold. Any suggestions or advise, please post.

The car runs very well, with a lot of power. However, this is the set up:

- it idles at 1500 in N, and 900 in D
- putting it in diagnostic mode, the timing light gives the light indicating timing is at 9 to 10 degrees. The idle goes and stays at 750 in N in diagnostic mode
- in diagnostic mode, the cooling fans do not turn on, no matter how far or which way the TPS is turned
- the idle screw on the intake manifold is completely shut
- the throttle linkage is not affecting any of this, as the throttle valve is closed
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post #6 of 10 (permalink) Old 11-13-16, 22:38

 
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like I said the idle screw should NOT be fully shut. And yes the throttle linkage actually matters to this, don't crap on advise if I am the only one giving it

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post #7 of 10 (permalink) Old 11-14-16, 9:13 Thread Starter
 
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I just wrote the above to mention the throttle linkage is not affecting this idle problem, as
the throttle is fully closed. It has nothing to do with your advise !

The idle is too high, and the idle screw is already fully closed. So there is no more adjustment I can do with the idle screw.

I don't know how to bring the idle down in this situation.
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post #8 of 10 (permalink) Old 11-14-16, 9:54

 
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This is not worth my time to help you out if you don't understand the process in setting your idle

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post #9 of 10 (permalink) Old 11-14-16, 11:58 Thread Starter
 
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I already did the procedure:

- put in diagnostic mode
- check timing to see if it is as 10 degrees btdc
- try to adjust idle with idle screw

The idle is at 1500 rpm with the idle screw closed all the way. I can't bring it down further.
Maybe it is something to do with a KLDE intake manifold on a KLZE engine ? This increase in idle speed started when I installed a new distributor and had the original KLDE engine.

The throttle is closed all the way. No interference with throttle cable or foot feed causing
it to be open a bit.

Last edited by epxepx; 11-14-16 at 14:32.
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post #10 of 10 (permalink) Old 11-21-16, 19:58 Thread Starter
 
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Now that colder weather has arrived, the idle has settled in at 1200 rpm, sometimes going to 1400 rpm.

As long as the car is running just like new, I guess I will leave it be for now.
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