I have a 2001 crown vic interceptor. Keep getting misfires on #4 and #7 plugs even after changing the boots, coils and plugs. Then wiggled the #4 & #7 and it ran like a new car for bout 6 miles.

Asked by Dec 29, 2014 at 10:57 PM about the 2001 Ford Crown Victoria Police Interceptor

Question type: Maintenance & Repair

then it came back #4 & #7. What else
could it be?

4 Answers

7,840

You, sir have just discovered a wiggle test, sir

Yeah does it mean theres a short somewhere?

7,840

It's like you make and break connection, that means the wires, connectors, or the component or sometimes its mounting are loose or loose fitting. that's an intermittant open rather than a short. When you get those components into certain light ? sometimes the part can be cracked or damaged. especially from previous overheat. I had one a while back where that caused intermittant misfire.

Best Answer

Thx danny, i will check and replace those two pigtails if necessary and see what happens.

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