i have a 1992 lx 5.0 , the car is basically stock except for cai , flowmasters , catted h pipe , msd cap and rotor and wires. The car runs really nice , engine doesnt make any weird noises and is very solid.Powersteering pump wines a lil bit and serp belt tentioner makes a lil noise but thats it. Im a bit of a nut when it comes to my cars sometimes over thinking things, but while the engine is idling in the garage with the hood up maybe once every 10 mins it will make a pretty solid single crack noise that i cannot pinpoint where it is coming from , other than it sounds pretty metallic. It does not make any cooling down noises coming from the exhaust with it not running but only will make the noise with it running , either hot or warming up randomly, but not often at all and you have to listen for it and sometimes it wont do it at all. I have read that a radiator could make this noise due to heating up and expanding and making a crack sound that comes from the metal tank area, (might be an original radiator due to it a ford branded part. Does this happen to anyone else and is it something i should worry about?
Engine make single crack noise while running
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Have you tried with the A/C on and off? It may be the clutch for the pump
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3,105 Posts
Sounds like the AC Compressor Cycling to me too.
The a/c compressor cycles more than once every 10 minutes. Plus, unless the op is both blind and retarded, he'd probably be able to find that totally obscure and hard to see compressor that's pretty much smacking you in the face when you open the hood.
its with the ac off , ac compressor sound is small to this. It does have the original radiator and sounds like an expansion type crack from either the convertor or radiator pretty solid sounding sound . I guess half of my problem is i have it idling in the garage and im listening for it , if i just drove it and didnt listen for it i would never notice it.
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If you have the climate control set to defrost the compressor will cycle on and off every so often without the ac being on.
If I were to guess(which is really all I can do without hearing it), I'd say it's your catalytic converters expanding with heat. They heat up faster than anything else when looking at external engine components.
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