Posted by 4play on March 26, 2020 at 21:54:53 from (12.235.184.17):
In Reply to: 91 Ford F150 trouble posted by 55 50 Ron on March 25, 2020 at 18:41:06:
Vacuum leaks can cause cold start issues and then might cause a higher than normal idle after warm. I'm sure you probably followed all the vac lines and sprayed something to look for leaks. The PCV valve and its hose are almost hidden at the back of the upper intake on passenger side and to pass valve cover, easy to miss visually or with spray.
The component that is responsible for idle speed is called the idle air control valve ( IAC ). These were notorious for failures, and sometimes can be removed and cleaned out. The IAC is mounted on the inboard side of throttle body beside where the two intake tubes mount. If a vac leak is not found it's possible the IAC could be gummed up or simply failed.
As mentioned temp sensors (coolant and air ) can cause problems like this too. The coolant temp sensor ECT in on the lower intake manifold right under the IAC. The air charge temp sensor ACT is on the lower intake too, about center line on the drivers side where the upper intake mounts to lower (2 wire sensor) These sensors are not interchangeable but look almost identical.
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