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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'98 Ford Ranger, Intake Whistles and Moans

Q: When the temperature is above 75-80 deg and when my '98 Ford Ranger (4 liter V6) has been driven 20-25 miles it has a whistle/moan at idle. I've taken the intake duct hose off from the filter at idle and the noise is decidedly louder and coming from inside the intake manifold. It does not have this resonance at lower temperatures or other than idle. The sound is loud enough that other drivers will turn and look at a traffic light. Any ideas for a solution?

A: I would suggest removing the intake duct hose from the intake manifold and inspect the throttle plate. Why? It is common for carbon deposits to build-up on the throttle plate and idle air control valve. The build-up of these carbon formations can create some interesting problems. Ford claims that their throttle plates have been treated with a special coating that prevents carbon build-up problems and no cleaning is necessary. What they claim and the reality of the real world just doesn’t match up. If inspection finds that there is carbon build-up use a mild cleaner on a rag and wipe away at the throttle plate and bore, until the carbon build-up is removed and all is bright and clean. It is possible you have a vacuum leak that is causing the whistle, but those carbon deposits on the throttle plates are a common problem.

 
     
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