Hi,
Does this only happen when the engine is cold? I'm trying to narrow things down. There are several things that can cause this. Low fuel pressure, a faulty coolant temp sensor (ECT), low engine compression, an engine vacuum leak, and so on.
Has the check engine light ever come on while the engine is running? If it does, then you should start by scanning the computer. Next, you mentioned a ticking. If it is coming from an exhaust manifold, that can cause the computer to think there is a lean fuel mixture. As a result, it would make the air/fuel mixture richer and that can cause it.
Interestingly, with heat, the exhaust manifold would expand and the leak may stop allowing the engine to run normally. That is just a thought. I don't know what the tic is or where it is coming from.
Here is what I recommend: First, if the check engine light is on, have the computer scanned for diagnostic trouble codes. Most parts stores will do it for free.
If that isn't on, I need you to get a live data scan tool. Connect it and check the ECT signal when cold to see if it is close to ambient temperatures. If it is, start the engine and allow it to run a few minutes, and then check the short-term fuel trims. Let me know what they are.
Also, you may want to check for engine vacuum leaks when cold. Here is a link that explains how to do it:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Let me know what you find or if you have other questions.
Take care,
Joe
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Saturday, April 24th, 2021 AT 9:53 PM
