Engine Surge
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4wd Low
Joined: Jun 2023
Posts: 13
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Engine Surge
After my truck warms up, my engine will surge for a second then idle down. It does this consistently once the engine is warm. I cleaned the IAC valve and throttle body. I read somewhere that there was an issue with some gasket deteriorating and getting stuck causing blockage somewhere, resulting in idle issues. Any idea on what part that was? I want to say it was the mass airflow sensor? Thanks.
Logistics Pro
Joined: Nov 2013
Posts: 3,928
Likes: 1,198
From: Mojave, Ca
Alot of surging idle complaints are caused by vacuum leaks. These trucks are over 30 years old and the vacuum hoses crack like pretzels. Take a good look at all your vacuum hoses. Spray brake cleaner around your intake manifold while the engine is running and listen for changes in the rpm.
Hotshot
Joined: Jun 2015
Posts: 12,840
Likes: 2,437
There is no gasket between the air box lid and the MAF sensor to get stuck. Not only that but your ‘90 does not have a mass air sensor.
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Jlckb5
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 5, 2011 07:25 PM
