High Idle
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New User
Joined: Jan 2004
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High Idle
Hello
I have a 1988 F150 4x4, 5.0L. It is idling very high and will maintain 32MPH with foot off the accelerator. I cleaned the the throttle plates. I noticed (finally) that I had no Check engine light when starting the truck. I found that there was no bulb in the check eng lamp holder (sold to me thaty way). I installed the bulb and I now get a flashing check engine light when accelerating (ocasionally). I wanted to read the codes myself using the check eng light or a meter. Where is the test connector and what pins do a short and are there any other troubleshooting advice for the high idle.
I have a 1988 F150 4x4, 5.0L. It is idling very high and will maintain 32MPH with foot off the accelerator. I cleaned the the throttle plates. I noticed (finally) that I had no Check engine light when starting the truck. I found that there was no bulb in the check eng lamp holder (sold to me thaty way). I installed the bulb and I now get a flashing check engine light when accelerating (ocasionally). I wanted to read the codes myself using the check eng light or a meter. Where is the test connector and what pins do a short and are there any other troubleshooting advice for the high idle.
Senior User
Joined: Oct 2003
Posts: 100
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From: new jersey
i have an 87 f150 with a 5.0, dthe diagnostic hook up is on top of the right fender, its an orange box and it will say diagnostic on it but first off i would check for a major vacumn leak, like a pcv line fell off or one near the brake booster. good luck, post back let us know what you find
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