![5. Fuel Injection - 5.1 Idle Speed and Maximum RPM Adjustments - Checking and Adjusting Idle Speed (1986 and later models with idle speed boost) 5. Fuel Injection - 5.1 Idle Speed and Maximum RPM Adjustments - Checking and Adjusting Idle Speed (1986 and later models with idle speed boost)](http://eva2.homeip.net/eva2/FU02/i22524.gif)
5. Fuel Injection - 5.1 Idle Speed and Maximum RPM Adjustments - Checking and Adjusting Idle Speed (1986 and later models with idle speed boost)
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5. Fuel Injection - 5.1 Idle Speed and Maximum RPM Adjustments - Checking and Adjusting Maximum RPM (All diesel and turbo diesel models)
SPL measurement of a diesel engine car: idle (left) and drive condition... | Download Scientific Diagram
![2018 Ford f350 diesel. When it sits idle, the engine revs up to 1k RPM and drops when I press/touch the break or gas. If I touch nothing, it stays revved up 2018 Ford f350 diesel. When it sits idle, the engine revs up to 1k RPM and drops when I press/touch the break or gas. If I touch nothing, it stays revved up](https://preview.redd.it/rvi9tj1qxgu81.jpg?width=640&crop=smart&auto=webp&s=354e1c78c3b65e82c61255333c01f2d708e209ce)
2018 Ford f350 diesel. When it sits idle, the engine revs up to 1k RPM and drops when I press/touch the break or gas. If I touch nothing, it stays revved up
![1977 to 1985 Diesel engine Idle Speed Adjustment TOOL | Specialty Tools Product | MercedesSource.com 1977 to 1985 Diesel engine Idle Speed Adjustment TOOL | Specialty Tools Product | MercedesSource.com](https://dq4zp01npifg0.cloudfront.net/cdn/farfuture/ZVSnGVGIDRyPsargrUPbPMGOzG-jtlg6_1AP1WWZBb0/mtime:1594564624/sites/default/files/field/commerce/IMG_4771_1.jpg)