Runs Like in 7 Cilinders

[kike058]

I have this 1994 grand marquis with 4.6 L engine. About a Week ago felt a drop o power, like a lost of a spark plug.

This weekend I chenged the fuel filter, sprak plugs and I still had the problem. When a was checking the spark plugs again I noticed that the Spark on the Coil Pack on the driver side, the 2 conector for the No. 2 and No. 8 cilinder was not as vivid as the other 2.

So Yesterday I changed the Coil Pack for a new one with the same results.

After re-checking all the cilinders, I felt like the No.2 cilinder is the one that seems to be the one with lack of power.

After that I swap the No. 2 and No. 3 injectors and plugs just to make sure thay are OK, then cheked the compresion on all cilinders and they are around 150 PSI.

At the end of the day and all this work done, I still have the same problem.

I have one word for you guys.

H E L P !!!!!!!!!!!!!!!!!!!!!

Thanks

[fredjacksonsan]

Sounds like it's not getting the voltage to fire the plug. How are your spark plug wires?

[kike058]

Originally Posted by fredjacksonsan

Sounds like it's not getting the voltage to fire the plug. How are your spark plug wires?

Fred:

Thanks for reply.

I changed the wire for new ones made by Bosch.

Problem solved.

My previous owner have it isntall some p.o.s. wires.

I Still need to check the EGR valve.

Thanks again

[fredjacksonsan]

[jimmytroanoke]

If you have any more problems get Motorcraft wires. If you did not put dielectric grease in the boots take them loose and do it now. When it rains water can pool in the plug wells and that is why you need the grease. Also makes it easier to get them off when it is time to change plugs

[cobradude360]

whats wrong with your egr?

[kike058]

Originally Posted by cobradude360

whats wrong with your egr?

The check engine goes on, I have this code tester and it shows this code for "No EGR flow present".

I need to take off to check if it's stuck or something.

Some time the engine knocks under acceleration, and then the light goes on.

I'm using 86 fuel and the temp is normal, so I think that the EGR is not opening when it should.

[jimmytroanoke]

Originally Posted by kike058

The check engine goes on, I have this code tester and it shows this code for "No EGR flow present".

I need to take off to check if it's stuck or something.

Some time the engine knocks under acceleration, and then the light goes on.

I'm using 86 fuel and the temp is normal, so I think that the EGR is not opening when it should.

This engine is famous for clogged EGR Passages in the intake. Remove the elbow that your throttle body is attached to from the intake and look under the gasket - there is a horseshoe shaped passage there that is full of guck. shopvac the guck out and push a rod down the passages to the egr valve. this is so common on these engines that the EGR valve itself is rarely the culprit.

[cobradude360]

try useing a tiny flat bladed screw driver also to clean them out i did this and noticed a really big differnce in idle and a lil performance also try some carb and choke cleaner if it gets hard to remove also order a new gasket for were the elbow meets the manifold

[jesus058]

Originally Posted by cobradude360

try useing a tiny flat bladed screw driver also to clean them out i did this and noticed a really big differnce in idle and a lil performance also try some carb and choke cleaner if it gets hard to remove also order a new gasket for were the elbow meets the manifold

Thanks for the hint guys.

Finally I had the chance to dive into de elbow and I did what you told me, you were right, that horse shoe shape pipe was clogged. Looks like the problem is gone.

The odd thing here is that the I saw no gasket on the elbow - manifold joint and it's running fine.

[jimmytroanoke]

Originally Posted by jesus058

Thanks for the hint guys.

Finally I had the chance to dive into de elbow and I did what you told me, you were right, that horse shoe shape pipe was clogged. Looks like the problem is gone.

The odd thing here is that the I saw no gasket on the elbow - manifold joint and it's running fine.

Are you sure that the gasket was not stuck to the elbow? If not, then you better get one from the dealer - they are only 3 bucks and most dealers stock them because this problem is so common. Otherwise you are headed for a vacuum leak which will cause all kinds of driveability concerns and false check engine lights.

[cobradude360]

if its the horse shoe linr i think ur talking about then its the line to the idle air control moter

[jesus058]

Originally Posted by cobradude360

if its the horse shoe linr i think ur talking about then its the line to the idle air control moter

Noup, It's actually the passage that is under the throttle elbow.

Thanks for the hint again.

[jesus058]

Originally Posted by jimmytroanoke

Are you sure that the gasket was not stuck to the elbow? If not, then you better get one from the dealer - they are only 3 bucks and most dealers stock them because this problem is so common. Otherwise you are headed for a vacuum leak which will cause all kinds of driveability concerns and false check engine lights.

At this time the car is running OK, no check engine light so far.

I clean both surfaces very well before re-installation.

Anyhow, at the first chance I will install that gasket.

Thanks again

[full_flex]

Hi, I think I'm having the same problem. Can someone explain where and what I'm supposed to be replacing/cleaning? Any detail or information on how to proceed would be very appreciated. Thanks in advance.