are tune ups required on this v8 engine

Asked by Nov 14, 2019 at 10:46 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

5 Answers

260,275

You need to replace the spark plugs every 100,000 miles with double platinum and occasionally replace a bad coil.

1 people found this helpful.
120,835

Exactly, only thing is Ford recommends spark plug replacement at 90,000 miles and using iridium spark plugs. I have a 2008 Grand Marquis as my daily driver. Hope that helps! Jim

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260,275

I was going from what my 2002 and 03 Fords were spec'd for but Iridiums are better than platinum.

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120,835

Interesting that the mileage interval was lowered for later models. Jim

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260,275

I think 100k with platinum's is a little long. 90k is better.

1 people found this helpful.

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