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  #1 (permalink)  
Old 18 Nov 2016, 08:02 pm
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Default Idle ?

How can I adjust the idle of my 07 NA ? I would like to crank it up just a bit.
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Old 18 Nov 2016, 09:36 pm
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Default Re: Idle ?

What is your current rpm on an idle?
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Old 18 Nov 2016, 10:41 pm
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Default Re: Idle ?

Quote:
Originally Posted by red98gt View Post
How can I adjust the idle of my 07 NA ? I would like to crank it up just a bit.
not possible mechanically. the idle speed is controlled by the engine computer. if you wanted to have it changed you would need to have your computer programmed with a new target idle speed.

one thing you can do is verify your idle speed according to the engine's specifications with a scan tool with data stream capability or an inductive electronic tachometer around the #1 spark wire.

Quote:
The Idle Air Control (IAC) motor is mounted on the throttle body. The PCM operates the idle air control motor.

The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes.

The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates air flow through it.

The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

When engine rpm is above idle speed, the IAC is used for the following functions:
Off-idle dashpot
Deceleration air flow control
A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:
Gear position
ECT Sensor
Battery voltage
Ambient/Battery Temperature Sensor
VSS
TPS
MAP Sensor
the target idle speed is about 750rpm with no loads, engine up to temp.
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Old 21 Nov 2016, 06:19 am
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Default Re: Idle ?

I too have a low idle. Seems to worsen in drive when the heater fan or rear defogger is turned on. The car also is pinging which it never did. I know I posted on here already and have been advised to check for a vacuum leak, jumped timing belt, plugs and wires, which are new. It has a new head 54 K miles ago. At that time I cleaned the carbon off the piston tops. Rather than throw parts at it I was trying to revert back to my motorhead days of the 70's and 80's when most cars actually pinged. In those days we had a distributor which controlled the ignition timing and was adjustable, timing was advanced on vacuum engine load to help give more power by advancing the ignition timing. If too far advanced at idle the idle speed would be higher the normal, if too retarded the idle would be rough. Pinging or detonation is ignition timing related, not valve timing, and I think also may be related to my idle issue. I think whatever tells the PCM where to set the ignition timing may be faulty. I just do not know what that is? Crankshaft position sensor? Camshaft position sensor? Do they work together? Anti knock sensor?
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Old 21 Nov 2016, 11:19 am
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Default Re: Idle ?

ok, so you have a low idle. if you actually come here and posted your actual idle speed, that would have been useful.
you see the engine computer monitors the idle speed and would have given a diagnostic code for you if the idle speed was below what it should be for any significant time, which you could use to start some sort of logical based process to get the problem solved. at this point im not going to provide any more help here until you start to follow instructions.

Quote:
Originally Posted by L2fish View Post
I too have a low idle. Seems to worsen in drive when the heater fan or rear defogger is turned on. The car also is pinging which it never did. I know I posted on here already and have been advised to check for a vacuum leak, jumped timing belt, plugs and wires, which are new. It has a new head 54 K miles ago. At that time I cleaned the carbon off the piston tops. Rather than throw parts at it I was trying to revert back to my motorhead days of the 70's and 80's when most cars actually pinged. In those days we had a distributor which controlled the ignition timing and was adjustable, timing was advanced on vacuum engine load to help give more power by advancing the ignition timing. If too far advanced at idle the idle speed would be higher the normal, if too retarded the idle would be rough. Pinging or detonation is ignition timing related, not valve timing, and I think also may be related to my idle issue. I think whatever tells the PCM where to set the ignition timing may be faulty. I just do not know what that is? Crankshaft position sensor? Camshaft position sensor? Do they work together? Anti knock sensor?
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Old 21 Nov 2016, 11:27 am
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Default Re: Idle ?

Quote:
Originally Posted by L2fish View Post
Rather than throw parts at it I was trying to revert back to my motorhead days of the 70's and 80's when most cars actually pinged. In those days we had a distributor which controlled the ignition timing and was adjustable, timing was advanced on vacuum engine load to help give more power by advancing the ignition timing. If too far advanced at idle the idle speed would be higher the normal, if too retarded the idle would be rough. Pinging or detonation is ignition timing related,
The description of mechanical distributor timing operations specifically ignition timing very basic and really missing much more !!!

Let me say that even though the engines were not ignition computer controlled there were numerous adjustments and addition supportive parts that could have been incorporated,modified and ultimately used to adjust ignition settings acting as if computer controlled.

Also engine knock is not always ignition timing related.


Quote:
Originally Posted by _PTGT03 View Post
ok, so you have a low idle. if you actually come here and posted your actual idle speed, that would have been useful.
you see the engine computer monitors the idle speed and would have given a diagnostic code for you if the idle speed was below what it should be for any significant time, which you could use to start some sort of logical based process to get the problem solved. at this point im not going to provide any more help here until you start to follow instructions.
It would also be nice to know the year, model transmission of the PT Cruiser.
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Last edited by NitroPT; 21 Nov 2016 at 11:32 am.
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Old 21 Nov 2016, 11:56 am
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Default Re: Idle ?

Check for vacuumed leak. Also check pcv hose and elbow for a slight tear you will have to pysically check by hand while it's running to see if idle goes up or down listen for a hiss . Check spark wires plugs.
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Old 21 Nov 2016, 12:22 pm
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Default Re: Idle ?

how come nobody recommends the free/simple things anymore, like cleaning the IAC and making sure the airfilter isn't filthy?

threads like this make me giggle since i have so much adjustability in my 1992 beater
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Old 21 Nov 2016, 12:56 pm
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Default Re: Idle ?

Quote:
Originally Posted by rob302 View Post
**how come nobody recommends the free/simple things anymore, like cleaning the IAC and making sure the airfilter isn't filthy?

threads like this make me giggle since i have so much adjustability in my 1992 beater
**For me, because there has not been enough initial information about what the idle speed is.

At times I consider the member what to suggest for repairs based on posting responses.
In this case...
It may only seem that it is low comparing perhaps another vehicle?
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Old 21 Nov 2016, 02:28 pm
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Default Re: Idle ?

Quote:
Originally Posted by NitroPT View Post
**For me, because there has not been enough initial information about what the idle speed is.

At times I consider the member what to suggest for repairs based on posting responses.
In this case...
It may only seem that it is low comparing perhaps another vehicle?
+1
My wife's car will idle high when it is first started. I believe that is to charge the battery up IIRC, and then drop to a nice low idle well sub 900. My PT pretty much goes around 800 out of the gate
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