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1995 mercury sable: to jerk..driving down..spark plugs..rotor

Customer Question
What can cause a 1995...
What can cause a 1995 mercury sable to jerk while driving down the road? The spark plugs have been replaced. The rotor and distributer have been replaced. Fuel injection cleaner has been added to the fuel tank. No code comes up when put on the machine. Help!!
Submitted: 6 years ago.Category: Mercury
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Answered in 2 minutes by:
5/1/2011
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Thomas
Thomas, Mercury Technician
Category: Mercury
Satisfied Customers: 1,543
Experience: Auto mechanic with 15 years exp. and Ford certified
Verified

Thomas :

Hello and welcome to Just Answer! I will do my best to help you fix your automotive problem today.

Thomas :

Have you also replaced the spark plug wires?

JACUSTOMER-q2dw4x9g- :

No

JACUSTOMER-q2dw4x9g- :

I have also replaced the pcv valve

Thomas :

You have a problem in your ignition system and you have covered everything else. If you replace the wires it should fix your problem.

JACUSTOMER-q2dw4x9g- :

I have a 98 jeep wrangler and it had a very simliar problem and i replaced the egr valve, it fixed the problem. I'm not sure what the egr valve does. Do you think thats a possiblity? The 1995 mercury does not jerk all of the time, but for the most part it does.

Thomas :

If your EGR valve was the cause it should set a check engine light.

JACUSTOMER-q2dw4x9g- :

We will try the new spark plugs wires. If this doesn't fix the problem, will i be allowed to ask more questions?

Thomas :

Yes you can no problem I will close the live chat session and you can pick it up when you like.

Thomas
Thomas, Mercury Technician
Category: Mercury
Satisfied Customers: 1,543
Experience: Auto mechanic with 15 years exp. and Ford certified
Verified
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Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
.
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Customer reply replied 6 years ago

I changed the spark plugs wires in the car, and that did not fix the problem.

Customer reply replied 6 years ago

I changed the spark plugs wires in the car, and that did not fix the problem. The car still jerks when going down the road.

Customer reply replied 6 years ago

What should I try next???????

Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Ok sorry, Did you just replace the spark plugs? Or has it been a while?
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Customer reply replied 6 years ago
Just replaced them last weekend.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
At what speed does it jerk? All the time or just once in a while.
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Customer reply replied 6 years ago

It used to be just once in a while, but now it seems like it jerks most of the time. The fluids have all been checked.

Customer reply replied 6 years ago
We are trying to get this repair done today.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Sorry I understand. The reason i ask is a torque converter shutter sometimes feels like a miss. But it only does this while shifting into O/D.
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Customer reply replied 6 years ago
It feels like like the engine is missing or misfiring or something.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Did the problem start after replacing the plugs cap and button or you did that trying to fix the problem?
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Customer reply replied 6 years ago
I did this trying to fix the problem.
Customer reply replied 6 years ago
?
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Ok just wanted to make sure. It may have fowled out one of your new plugs from missing due to a bad plug wire. You may have to remove the plugs and inspect them to see if you can see a bad looking one or just replace them again.
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Customer reply replied 6 years ago
I will look at the plugs again.
Customer reply replied 6 years ago
What if this is not the problem?
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago

It has to be the ignition system if it is missing under a load. We just have to find out what the cause is.

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Customer reply replied 6 years ago
What do we have to do to determine what is wrong with the ignition system.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Well thats the hard part if you could get it to miss sitting still by brake torquing the engine you could pull the plug wires and find out which cyl. is bad. The 1995 vehicles are not good about setting a code for the missing cly. So it is a matter of replacing parts until you fix it.
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Customer reply replied 6 years ago
All the spark plugs look good.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
What kind of spark plugs are you using?
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Customer reply replied 6 years ago
Motorcraft
Customer reply replied 6 years ago
I am not satisfied with the information I have received today, and would like a refund of my 18.00 dollars!
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago

The best for your car. I was wondering because I have had trouble with other brands. Disconnect the vacuum line to the egr valve and road test the car again see if the miss goes away. I have had the ports plug up and dump all the egr flow to one or two cylinders causing a miss.

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Customer reply replied 6 years ago
It has started to rain here, and I am unable to work on the car at the moment. I will have to wait until the rain stops. I wil disconnect the vacuum line when I am able to work on it again.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Sorry for the delay, your car is not a easy fix. I am trying to help your car. Put you can get a refund if you like.
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Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Ok let me know.
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Customer reply replied 6 years ago

I took the vacuum line off of the egr valve, and its running fine, but sometimes it will run fine, so I don't know if this is the problem. No check engine light has come on yet.

Customer reply replied 6 years ago

Please advise!

Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
You need to drive it a little more and see if it will miss again. If it doesn't miss anymore with the valve disconnected we know what direction to go. Also is your engine a 3.0l or a 3.8l?
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Customer reply replied 6 years ago
The car has been driven for a couple of days, and it hasn't been jerking. The engine is a 3.01.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Ok good the cause must me the DPFE sensor it reads the exhaust pressure and sends it to the engine control module. Here is a picture of one.
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Customer reply replied 6 years ago
Is this a dealer part or can it be purchased at the auto parts store?
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
You can get it at most all parts stores. I recommend NAPA or the dealer on engine electronic parts.
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Customer reply replied 6 years ago
I will try this. Thanks! But, if this doesn't fix it, can I still ask questions?
Customer reply replied 6 years ago
Also, can you tell me where the DPFE is located on the engine.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Yes it is mounted on the intake manifold. Your year is a split year it may only have 1 tube going to it if so it is called a PFE sensor. Or it could be the 2 tube DPFE sensor. I have you a picture of both locations to help.
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Customer reply replied 6 years ago

I have the EGR valve on the top of the engine like the second drawing. So I'm guessing the EGR Valve is the part that needs to be replaced, as I was thinking from the very beginning of these questions!

Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
No there is nothing wrong with your EGR valve. If you disconnected the vacuum line to it and the problem went away, it is working as it should.
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Customer reply replied 6 years ago
Thank you! I I will replace the sensor to see if this corrects the problem.
Mercury Mechanic: Thomas, Mercury Technician replied 6 years ago
Your welcome
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Thomas
Thomas
Thomas, Mercury Technician
Category: Mercury
Satisfied Customers: 1,543
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Experience: Auto mechanic with 15 years exp. and Ford certified

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