My 94 grand marquis drives fine til I get to 30 to 40mph then it shakes. if I let off the gas it stops and drives normal after that what could this be?
Check the fuel pump and plugs{coil}
Testimonial: "thank you very much for your reply. I will def check those out and see if it helps although im pretty sure everything that has to do with the fuel has been checked and done but will look into it..thanks a bunch!!"
SOURCE: 94 honda civic wont accelerate over 40mph
I would start with an oil change using proper weight, filter and oil drain plug crush washer. wrong weight of oil can definately cause the issue.
SOURCE: 94 grand am Head Gasket?
Check ur spark plugs for wetness, if u have water in ur cylinders, you have a gasket problem. 94-95 grand am had a problem with intake gaskets, but my grand am also had a manufacture error on the head gasket too. The dragged the heads over it putting the heads back on and smashed the rings..
SOURCE: 94 grand marquis driving at highway speed or up
Your codes indicate both sides of your engine are running lean. You may have success with a throttle position sensor. The TPS tells the engine how much fuel is wanted and to advance spark. It is behind the plastic ductwork, on the metal body called an airhorn. Usually on the drivers side. It has 2 screws and 1 electric plug and rides the butterfly flap outside the airhorn. Used to be $25.
I see you have codes and I can not tell you why it did not pull up the TPS. The alternative is to have someone check your fuel pump pressure.
SOURCE: good engine swap for a 94 grand grand marquis
Another 4.6 out of a '94 Grand Marquis. If you can. That way all the sensors will be correct and the wiring harness will plug-and-play. You can install almost any 4.6 but, depending on the year, there's going to be a lot of issues making them work with the electronics in your '94 Marquis.
SOURCE: My 1985 grand Marquis won't start I can pour gas
Take the gas filter off. Should be located near the front of the carbeurator, take off the air cleaner and look for it, it takes 2 wrenches to take it off, a little gas may spill out but not much and replace it, however there is a strong possibility that he gas pump is out if the filter is fine. Hope this helps
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I also wanted to ad the the shaking seems to be coming from the left front side..
get it checked, shacking can be very dangerous, get real hand eyes on it, we can feel it or check it.
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