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Idle issue

 
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  #11 (permalink)  
Old 08 Aug 2016, 08:25 am
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Default Re: Idle issue

Pressurize your intake manifold with silicone hose adapters and clamps attached to a shop vac in reverse, and also plug your tailpipe with a towel. your engine is off and the key is out maybe even take the negative cable off the battery too to reset the computer. get a bottle of soapy spray water and a strong flashlight. use a clamp to hold open your throttle plate so the air pressure from the vacuum can pass through.
start by checking for leaks in your hoses that run from the manifold ,and their connections, then your intake manifold where the upper and lower manifold attach to the engine block area spray down each area good where they connect. look for a constant stream of forming air bubbles and also listen for hissing noises. if you find any leaks this will let you know exactly where the issue is coming from so it can be repaired.
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Last edited by _PTGT03; 08 Aug 2016 at 08:51 am.
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Old 09 Aug 2016, 03:28 pm
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Default Re: Idle issue

I took off throttle body, and there was hardly any dirt. I test drove the car today and the shaking is hardly a problem at idle without the AC, but when I turn the AC on the car vibrates so much that you can hear it! A few weeks ago when I had the water pump replaced, my mechanic told me that my catalyst was in bad condition, but that the car would drive fine. The catalyst noise has gotten louder. Could it be that, are spark plugs a possibility? Also, I don't hear a difference in fan speed when the AC is turned on.

Last edited by Dg123; 09 Aug 2016 at 03:34 pm.
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Old 09 Aug 2016, 04:02 pm
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Default Re: Idle issue

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Originally Posted by Dg123 View Post
I took off throttle body, and there was hardly any dirt. I test drove the car today and the shaking is hardly a problem at idle without the AC, but when I turn the AC on the car vibrates so much that you can hear it! A few weeks ago when I had the water pump replaced, my mechanic told me that my catalyst was in bad condition, but that the car would drive fine. The catalyst noise has gotten louder. Could it be that, are spark plugs a possibility? Also, I don't hear a difference in fan speed when the AC is turned on.
With the engine cold, start the engine, turn on the A/C. Your high speed on the radiator fan should be coming on. If not you need to find out why the high speed is not working. If the high speed is not working your A/C is having a hard time causing idle problems because the A/C condenser needs to be kept cool with the radiator fan.
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Old 09 Aug 2016, 05:50 pm
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Default Re: Idle issue

OK, I will do that once the. Car cools down. During my drive the vibration seemed to become hardly an issue once the car warmed up. But when I turn on the AC, the car doesn't raise the idle rpm, is that normal?
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Old 09 Aug 2016, 09:08 pm
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Default Re: Idle issue

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Originally Posted by Dg123 View Post
OK, I will do that once the. Car cools down. During my drive the vibration seemed to become hardly an issue once the car warmed up. But when I turn on the AC, the car doesn't raise the idle rpm, is that normal?
this is normal. the computer senses the air conditioning being turned on and increases the engine idle speed to compensate for the increase of load but doesn't actually change the idle speed effectively.

second, your vibration issues at idle could be torn engine mounts.
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  #16 (permalink)  
Old 09 Aug 2016, 10:01 pm
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Default Re: Idle issue

I would suggest checking the radiator fan before checking the motor mounts. It doesn't take long to check the radiator fan.
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Old 10 Aug 2016, 05:25 pm
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Default Re: Idle issue

I haven't been able to see if the radiator fan works at 2 speeds because it is hot outside so it is always on. I changed my spark plugs yesterday and it seemed to help, but now only when I turn on the AC, the car drops rpms slightly, and the car vibrates as if it's going to die and then it goes normal. The car vibrates a little more with the AC to, but only at idle. Also when I turn the wheel at idle, the car shakes and rpms drop too. I had my serpentine pully replaced a few weeks ago shortly before the issue.
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Old 10 Aug 2016, 05:39 pm
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Default Re: Idle issue

Quote:
Originally Posted by Dg123 View Post
I haven't been able to see if the radiator fan works at 2 speeds because it is hot outside so it is always on. I changed my spark plugs yesterday and it seemed to help, but now only when I turn on the AC, the car drops rpms slightly, and the car vibrates as if it's going to die and then it goes normal. The car vibrates a little more with the AC to, but only at idle. Also when I turn the wheel at idle, the car shakes and rpms drop too. I had my serpentine pully replaced a few weeks ago shortly before the issue.
With the engine cold, start the engine, turn on the A/C. Your high speed on the radiator fan should be coming on automatically. If it does not come on chances are your high speed fan is not coming on. You are throwing parts at the PT Cruiser and its not necessary. Just do an diagnosis first. It doesn't cost you anything.
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Old 10 Aug 2016, 10:33 pm
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Default Re: Idle issue

I did what you said and it didn't kick in. I took it for a drive around the block to see if I could get it to kick in but no luck. The temp needle was already at operating temperature (half-way), and the fan wasn't on. I looked under the hood and I can hear a loud electrical buzzing noise from where the non-spinning fan is. Also my car vibrates still and makes a sort of "hollow sounding" noise.
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  #20 (permalink)  
Old 10 Aug 2016, 10:42 pm
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Default Re: Idle issue

I would suggest now to manually test the radiator fan to confirm it is not working properly.

At the bottom of the radiator fan unplug the wire harness. Manually apply 12 volts from the battery to see if the fan is not working.
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