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16/10/2021 1:24 pm
Topic starter
Hi I’ve got a 1999 ford e250 4.2 v6 with a code P3030 cylinder 3 misfire. I have replaced the spark plugs, ignition coil and the spark plug wires. I think I could be a vacuum leak but I’m not sure what a good way to test the vacuum. Christian.
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16/10/2021 5:47 pm
Well it could be tons of things more often it's a bad fuel injector or a bad valve or piston ring and that cylinder making it not fire right. But to check vacuum leaks you can inject smoke into the intake system to see if it's leaking out anywhere or you can spray carburetor cleaner all around the number three cylinder and if it starts idling differently it could be the intake manifold gasket on number three
