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420A Loud Clicking Sound From Injectors

Posted by BLACK'98DSM, Oct 15, 2019

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  1. BLACK'98DSM

    BLACK'98DSM Proven Member

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    At idle I can hear what sounds like a ticking or clicking sound. Upon further investigation I believe the sound is coming from the fuel injectors. I wouldn't be too concerned about this, because I know a slight sound is normal, but the sound is pretty loud. At idle it is the most noticeable sound if you're outside the car.

    What's causing this?
     

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  2. jakk220

    jakk220 Proven Member

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    Probably a lifter
     

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  3. steve

    steve DSM Wiseman

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    That doesn't sound normal. Sure you can hear the injectors click if you open the hood and listen for them but I've never heard them be so loud that they are noticeable with the hood down.

    Have you tried using a piece of hose to listen through to localize the sound? If it's the injectors check the fuel pressure and make sure the insulators are in good shape.
     

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  4. BLACK'98DSM

    BLACK'98DSM Proven Member

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    That's what I thought at first but I tried listening around a bit and the sound is definitely coming from behind the valve cover in the intake manifold area.
     

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  5. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Are you thinking the fuel pressure is too high, or too low?
     

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  6. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I ask because I've been on the fence lately wondering if my stock fuel pump is shot.
     

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  7. steve

    steve DSM Wiseman

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    Not sure which would make a bigger difference just that it's a variable that can change the sound of the injectors and as such something to be eliminated as part of the diagnosis.
     

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  8. BLACK'98DSM

    BLACK'98DSM Proven Member

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    I never figured out the cause but it stopped after I pulled and then replaced the manifold and fuel rail.
     

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