Ford Repair Questions? Ask a Mechanic for Answers ASAP
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The most common repair is replacing the engine coolant temp sensor.
This acts like a choke did with carbureted cars years ago.
It richens the fuel mixture for better cold start operations.
Here's what a bad one looks like testing with a scope.
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Hi, I'm just following up with you to see if you have any more questions.Thanks, Ron
no change when I changed the CTS. I really didn't think this was the problem because it isn't what you might call "cold". It idles roughly with a loping type idle that sometimes shuts off. The hard line vacuum lines have been patched but these look sound.
You need to smoke the intake then, it sounds like there's a vacuum leak down there.