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2.0l Touring Edition - whistle with revs; vacuum leak?

 
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Old 24 Oct 2016, 11:48 am
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Default 2.0l Touring Edition - whistle with revs; vacuum leak?

Well, isn't this the perennial question?

This weekend I noted a whistle which sounded like the air conditioning compressor, however it's directly proportional to the engine RPM even with the clutch disengaged (manual trans). It became noticeable around 1100RPM through to 1500RPM, however today I've noticed that it's louder and audible up to a couple of thousand.

The oil filler doesn't indicate installation of an aftermarket chocolate milk factory, however I've not checked the coolant to see if I can hear the Mr Whippy theme yet. I'm not blowing white smoke so I don't suspect the head gasket right now, but everythings on the table, right?

It sounds louder in the cabin, however I guess that the engine just drowns it out with the lid up. Not sure if this video is in any way useful other than the point out that I haven't cleaned the bay yet.

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Old 24 Oct 2016, 08:15 pm
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

you can adapt a rig from a shop vac to apply pressure into the intake with the throttle butterfly held open. you can then use soapy water to spray down the engine with a inspection lamp and test all the hoses and mating surfaces for bubbles which indicate a vacuum leak. most likely if your idle speed has increased, it can be a vacuum leak.
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Old 24 Oct 2016, 11:28 pm
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

Most MacGyver, I love it!

The idle is sweet as a nut now since we found that there was a clip stuck between the mating faces of the intake manifold. The previous owner's garage made a dumb mistake with that one when replacing the timing belt, hence why we picked her up at a sweet price. I wonder if that might have compromised the seal in some manner? When it was partially open, the engine randomly cut out and gave rough unstable idling. None of those symptoms are present right now other than the whistle. Performance is still on par.

I'll have to wait for the weekend to test out this method. I figured that spraying things around the engine might be on the cards. It has to be done.
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215'000km (55.9% distance to the moon, 71.7% of a second at light speed, Usain Bolt running for 200 days)

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Old 25 Oct 2016, 07:43 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

Yeah, it sounds like some kind of intake leak to me. Get come carb cleaner or WD40 or something like those and spray around the intake and air box with the engine running. If it picks up speed, you'll have found the leak.
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Old 25 Oct 2016, 08:47 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

brake clean works too. Any flammable aerosol. propane works if you have some on hand. slowly bleed some all around the intake system high and low, and when the engine creeps up, you found your leak. Chuzz has the right idea.
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Old 25 Oct 2016, 10:16 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

I've seen this flammable gas test idea mentioned several times researching this, however I've not seen any reasoning as to how it works. I mean, that bit interests me but mostly I like to increase my understanding rather than just apply a method blindly.

It's happened all of a sudden, as in the last few days. It's gotten colder here (near freezing) the last week so I guess that correlates with the whistling becoming a little less prominent when the engine warms up a bit. Not sure if that's a common aspect of vacuum leaks in old buggered hoses. I'm not even sure which ones are the vacuum hoses yet....
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2001 2.0l PT Cruiser Touring Edition
Mods: New gear knob, blue LED re-lighting, token chrome bits.
215'000km (55.9% distance to the moon, 71.7% of a second at light speed, Usain Bolt running for 200 days)

"People demand freedom of speech as a compensation for the freedom of thought which they seldom use" - Søren Kierkegaard
"What can be asserted without evidence can be dismissed without evidence" - Christopher Hitchens
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Old 25 Oct 2016, 10:44 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

Quote:
Originally Posted by Prostheta View Post
I've seen this flammable gas test idea mentioned several times researching this, however I've not seen any reasoning as to how it works. I mean, that bit interests me but mostly I like to increase my understanding rather than just apply a method blindly.

It's happened all of a sudden, as in the last few days. It's gotten colder here (near freezing) the last week so I guess that correlates with the whistling becoming a little less prominent when the engine warms up a bit. Not sure if that's a common aspect of vacuum leaks in old buggered hoses. I'm not even sure which ones are the vacuum hoses yet....
If there is a vacuum leak, it will suck the flammable agent into the engine where it will combust and change the idle. People use (used) unlit propane torches for years, when the propane gets sucking into the chamber it ignites and changes the idle. Others claim there are safer methods.
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Old 25 Oct 2016, 11:36 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

Gotcha. I wondered whether it would be adding more buck to the bang somewhere along the the line. Time to get the sprayable liquid fire out.
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2001 2.0l PT Cruiser Touring Edition
Mods: New gear knob, blue LED re-lighting, token chrome bits.
215'000km (55.9% distance to the moon, 71.7% of a second at light speed, Usain Bolt running for 200 days)

"People demand freedom of speech as a compensation for the freedom of thought which they seldom use" - Søren Kierkegaard
"What can be asserted without evidence can be dismissed without evidence" - Christopher Hitchens
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Old 29 Oct 2016, 07:21 am
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Default Re: 2.0l Touring Edition - whistle with revs; vacuum leak?

Well, brake cleaner around the manifold edges and hoses emerging from it produced nothing of note. It did however become less noticeable today. Whether me fooling around with the odd hose here and there made a difference, not sure.

The power steering pump started squealing like a belt out of hell today, cutting PS in and out then failed completely. Not sure if that's a complete pump or not, but it's likely. Seems to have solved the whistle/hissing too, but again, not sure if these are linked issues.

This is a joyous week.
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2001 2.0l PT Cruiser Touring Edition
Mods: New gear knob, blue LED re-lighting, token chrome bits.
215'000km (55.9% distance to the moon, 71.7% of a second at light speed, Usain Bolt running for 200 days)

"People demand freedom of speech as a compensation for the freedom of thought which they seldom use" - Søren Kierkegaard
"What can be asserted without evidence can be dismissed without evidence" - Christopher Hitchens
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