1993 E350 high idle

Asked by Jun 25, 2018 at 12:15 PM about the 1993 Ford E-350

Question type: Maintenance & Repair

My 7.5 Ford won’t idle down and sometimes it runs away. {rpm}. I took it
smog, failed the first time. But it passed 2nd time. And since then I’ve had
this problem. Appreciate your help.

3 Answers


Most of these have a sticky ISC, cleaning sometimes helps. Other causes are unmetered air or vacuum leaks.

Thank you for your response. Could you tell me where I ca find the isc ? And again thank you. I have a direction to go in.


I't located on the upper intake air chamber. See pic fro what it looks like.

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