Follow the steps outlined in the article. Just make sure to use the correct adapter to connect you compression gauge to the spark plug threaded hole. You can buy an inexpensive compression gauge at most auto parts stores.
I have a 2004 ford explorer. The Check Engine light was on, and it was giving the EGR code, but running fine. I replaced the EGR valve & cleared the code. The car ran great for 47miles. But this morning it started idling rough and smoking with a strong smell of gas. Then, the Check Engine light started blinking. The new codes are P0300, 0301, 0302, 0303, 0316, P0172. Any suggestions? Could the new EGR valve be bad?
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