Mercury Grand Marquis Car Questions Answered by Mechanic-On-Duty – 225 Messages

23 Feb 2015 | Author: | Comments Off on Mercury Grand Marquis Car Questions Answered by Mechanic-On-Duty – 225 Messages
Mercury Grand Marquis

Mercury Grand Marquis System

New User Asked My 2000 Grand Marguis on the freeway and would not start up. It cranks and sounds like it start but doesn’t. I replaced the air and fuel filter. The fuel was clogged, but changing these two did not change the situation.

I barrowed an OBD II Code Reader, but it returned no – literally, it said no Before I move onto the step – replacing the pump – I thought I ask for other opinions.

Roger Hello, Please test the pressure and advise the reading. size engine is in your car

You should have 30 –


New User – I have to go out and get a fuel pressure How long do I have available to to your inquiry?

Roger Take all of the time you need. is not a live chat. I will you.


New User I barrowed a fuel pressure but can’t figure out where to the pressure. Two possible ports: One has a tag says Evap Service 1 PSI Maximum Regulated Pressure and the second is part of a line goes to the radiator. I thought second one would be part of the fluid system.

Neither fits the pressure guage, but the is much closer than the

Roger – Your car has injection. On the steel fuel that supplies fuel to the there should be a valve a removable cap to connect the guage to. The rail mounts on top of the intake

Does the air inlet tube your view?

Neither of the two you mention are the correct connecting for the fuel guage.

Any help?

New User – OK, From description, I think I found the valve. Now I need an adaptor it is much smaller than the fitting. I need to call my to see if he has an adaptor.

Thanks for your

Roger – All right. No


New User – The pressure measures at 39 to 40 on the meter. would seem it indicate it is not the fuel pump. Am I correct? should I check next?

– There is reason to with the pressure reading you the fuel pump is still a one.

Next would be to for spark. Have you done You said it would try to start but not. If it tries to start one assume there is spark. But are two coil paks right?

for spark from each What did you find?


New – Sorry for the delay, but I had emergency come up. I did test for and was uncertain of the result. The wire to the plugs are different from I am used to from the older I have owned and worked on. We a wire into the connection so we reach metal on the engine.

We got one spark one time of about 4 The battery has been losing a little each day. wondering of this is an important I have hooked up a battery

Roger – Are you disconnecting the from the spark plug or a coil? If you check for spark on a connection of a plug wire you to hold the disconnected wire 1/4 inch of the coil tower it on. Use an insulated tool to hold the while someone else the engine for you.

A bright should jump the gap from the tower to the plug wire


New User – I I was testing a spark plug maybe I was mistaken. I will to wait until tomorroe to it

Roger – Be careful. spark is over 50,000 An insulated tool to hold the just above the coil will guard against shocked.


New User No spark from the spark wire. I found in the manual fuse to check. It was blown and I it. Still no spark. An aquaintance who is inclined suggested I remove the position censor and to check it at a against one at the store.

Is this an next steP? Thanks

– Did you check for spark both coils? Did the fuse you blown remain good?

Call a parts store and see if can check a crankshaft sensor to see if it is a one. If a test is not available yes, I think replacing the sensor would be a reasonable step.


New User No, I only check spark one spark plug from one I will check the other on Sunday. And I will can in the morning

Roger – I’ll try to in for your findings.


New – The store was not able to the crankshaft sensor, so I just it. I thought it might have be the as the car almost turned over but it did What is the next step?

– Its time to test for again from both You said prior to replacing the sensor you had no spark.

Today you that it almost turned That information raises that there is spark so spark from both would be next.


New – I have spark on sides, but the car still won’t over. Initially it sounds as if it but doesn’t. There is also a pop like a backfire that like it comes from the as it tries to turn over.

that, it may start to get close but not the same as the initial try.

If I to look at another component, try to describe where to find the The manual has given some but I have trouble finding it the parts are. No diagrams and the are often different than my

Roger – Let’s try off the radar. I want to know if engine can breathe. And I have concerns now about the length of the engine has been cranking to get it to start. is building up raw fuel in the at the catalytic converter.

Please an oxygen sensor that is in the header pipe that from one of the exhaust manifolds to the converter. Either side work. An oxygen sensor is a that has a short wiring pig coming out of the top of it.

The sensor screws the exhaust header pipe. It resembles a spark plug.

the sensor removed there is now a where exhaust can escape having to go through the catalytic If this opening allows the to start (it will be noisey) we can there is a restriction in the exhaust is preventing the engine to breathe.

you try this please?


New – I will give it a try

New – Is it possible this car has 2 converters? It appears that are 2 and the exhaust pipe joins them before joining the muffler.

Mercury Grand Marquis

Roger – there are two. Only one sensor before one of the converters be removed for the test I have in If the sensors before each are accessable remove one or both as you


New User – Are there 2 on each size? I removed one right before what I was the catalytic converter. I tried to the car with no difference. I noticed a sensor closer to the engine a turn in the exhaust pipe. I that one on the same side as and tried again.

This the engine alomost started up but not sustain. The back firing was too and I could see the air intake from when it back fired.

– Try cranking the engine the throttle closed. If it starts let it in hopes it will clear out fuel.

If the spark plugs are fuel fouled they be removed and cleaned. A can of brake or carb and choke cleaner work well.


New – If I understand you correctly, I not press on the gas when starting the correct?

Roger – A fuel injected car is always started without pressing the at all except in very cold


New User – It turned over and idled for minutes. It didn’t take any cranking to start up and no back It did idle rough, however.

this be becuase both are clogged and only one was relieved? I we made some good Thank-you.

Roger – The will need to run at idle for a before things begin to up. Removing the oxygen sensor the other side would the running of the engine but you may choose to on the extra work.

Your car has an exhaust restriction and it may be one or catalytic converters need The engine can’t breathe.

I a good reliable muffler check your cars for needs. The car should be towed to the

Anything else?


New – Not tonight, it’s here. I will need to for tomorrow. Would there be any at this point to allow it to longer?

Will that clear up if the catalytic converters are

Roger – Once the restriction is cleared the engine start, smoke out the tailpipe, run Let it warm up and then drive it as the cylinders burn off the results of the fuel. It will clear up but take 10 – 15 miles it seems right.

Idling the now for a longer period of time not reward you much. That the O2 sensor goes in is just not relief for the desired result.

Roger – Hello

Please update your status. Do you need help?

If you are to close the question please on OK to finish up.



– To close the question click on OK to finish up.

Mercury Grand Marquis
Mercury Grand Marquis
Mercury Grand Marquis
Mercury Grand Marquis
Mercury Grand Marquis
Mercury Grand Marquis

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