2003 grand marquis

Asked by Guru5GBQG Feb 14, 2018 at 09:41 PM about the 2003 Mercury Grand Marquis LSE

Question type: Maintenance & Repair

I have a 2003 grand marquis that won’t start with the air
filter connected to the throttl body. I remove the air filter
And with the throttle to the metal it starts but won’t stay
on. If for some reason stays on I hear a coughing through
the throttle body. If I press the gas several times while on
sometimes stays on but as soon as I replace the filter it
turns off. Yes it does have a clean filter. Fuel pump has
30psi when on. Sometimes it stays on perfectly with
everything connected but if I turn it off it won’t start unless
I remove the air filter. Has anyone had that problem if so
how did you fix it what was the problem

1 Answer

4,045

Bad or dirty MAF? some other sensor bad? You can buy MAF cleaner. Does it throw any codes with a reader? Vacuum leak somewhere? Let's see what the experts say.

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