Question about Ford E-250

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1991 Ford E-250 5.8L problem. Deep sucking sound from throttle intake. TPS replaced. Throttle gasket replaced vacuum hoses appear o.k. checked all throttle hoses. o.k. engine runs o.k. no computer codes. when engine revs increase, noise is less noticeable. Sound too deep to come from a 1/4 inch hose leak. Where to look next?

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  • Ford Master
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Did you replaced the manifold gasket?  If yes then the only thing left to check is the filter case and its pipe. But a deep sucking sound that weakens with the revs is what you should expect from an engine that sucks air thru a controlling valve.

Posted on Aug 06, 2010

  • 3 more comments 
  • jim firbank Aug 06, 2010

    No, I did not replace the manifold gasket. The problem appears to have started immediately following my replacement of the TPS. I have checked and re-checked all hoses etc. requiring connection to the throttle body. If there was a 1/4 inch hose vacuum leak, I would expect it to be a much higher pitch.

  • jim firbank Aug 06, 2010

    No, I did not replace the manifold gasket. The problem appears to have started immediately following my replacement of the TPS. I have checked and re-checked all hoses etc. requiring connection to the throttle body. If there was a 1/4 inch hose vacuum leak, I would expect it to be a much higher pitch.

  • jim firbank Aug 06, 2010

    If you are referring to the oil filler pipe, I did check to see if there was vacuum present and there was ( not significant though ). When the intake hoses are removed, the sound is most prevalent from the throttle body intake.

  • jim firbank Aug 06, 2010

    If you are referring to the oil filler pipe, I did check to see if there was vacuum present and there was ( not significant though ). When the intake hoses are removed, the sound is most prevalent from the throttle body intake.

  • Azrael SRL Aug 06, 2010

    No, it can't be a vacuum hose, if it would be it would turn the entire mixture haywire, and the engine runs OK. As i said, the noise is what you would expect, where you would expect to hear it, just that is louder than it used to be. Have you fitted a new type of air filter or a different filter case? Because thinnes/smaller ones dampen the noise less. Have you changed the attachments (bolt washers, rubber seals) ? Because harder ones raise the level of the sounds you hear.


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Instructions on how to remove and replace the throttle body follow:

Throttle Body REMOVAL & INSTALLATION
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prev.gif next.gif

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