My 1994 grand marquis spits & sputter when the engine is cold. Also sometimes loses power after it's left ideling too long sometime I don't have enough power to get up hills we replace the fuel filter & had the injectors cleaner what else could this be?
If the check engine light is not on, I doubt there is much you can do.
It sounds like one of the engine temp sensors or one of the other sensors. The engine temp sensor and the intake air temp sensor tell the computer what the outside air temp is and the coolant temp which allows the computer to regulate the amount of fuel going thru the injectors. Generally if one of the sensors has failed the check engine light should be on.
It could be low fuel pressure too.
You may have to have a shop check the sensors with a scanner and the fuel pressure with a gauge.
SOURCE: 1998 Grand Marquis. Start goods. idols low. put in
I would check the operation of the idle speed control valve, it is what changes the idle speed when a load like the transmission is put on the engine, without it the engine will idle slow and stall out, this is even more apparent when reverse gear is selected or drive or the AC is tuned on. The ISC valve is located on the side of the throttle body top of upper intake manifold. Below is a picture of the ISC (idle speed control valve)
SOURCE: My 2001 Mercury Grand Marquis LS has this jerking
You have a described one of the coils going bad. You need to ru na power balance test to determine which cylinder it is so only one is replaced.
Testimonial: "Thank you, I will get right to it"
SOURCE: 92 Mercury Grand Marquis 176K 4.6L - hard cold or
Try higher octane gas, but before you do check the maunufacturer recomondation, have timing checked
SOURCE: 1998 Mercury Grand Marquis GS runs Rough when cold
I have the same problem and can
Not figure it out did u have any luck?
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we did replace plugs & wire too
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