99 Ford Windstar 3.8l miss fire on cylinder #2 and lean on bank #1. I changed plugs,wires,and coil. Still miss firing and chugging! Someone help me please.

FIRST OFF LEARN THE RULES OF WASTED SPARK COIL PACKS
1-IF ONE WIRE OR PLUG GOES OPEN, YOU LOSE 2 PLUGS DEAD THAT IS BECAUSE 2 FIRE AT ONCE, AND IS WIRED IN SERIES
2-DO NOT MIX IF THE WIRES OR FIRING ORDER IS LOST (HORROR 1)

3- LEARN TO REPLACE HV WIRES 1 BY 1, NOT MIXING THEM UP EVER.
YOUR PACK IS 6 IN ONE, AND HAS 3 COILS INSIDE FIRING IN WASTED SPARK ORDER. IS THIS CLEAR? AND ANSWERS IT ALL.

4- WELL THE HV WIRES ARE FIRST TO CHANGED OUT WITH NEW SPARK PLUGS AS 17 OLD PLUGS AND HV WIRE SETS ARE NO GOOD UNLESS NGK MAG WIRE, NOW THAT IS A WINNER THOSE, NOT CARBON CORE OR SILCONE CORE JUNK WIRES EVER,SEE NOW MOTORCRAFT SAVED OUR BACON,

SEE PHOTO BELOW FOR FIRING ORDER.
ON TOP OF COIL CLEAR AS DAY 6" SEE 3 AND 4 THERE, THEY FIRE AT THE SAME TIME.
AS DOES 2/6 AND 1/5

5: CYLINDER #1 ON ALL V ENGINE IS THE ONE MOST FRONT
IT IS OFF SET TO THE FRONT MOST. BINGO #2
THEN WE GET ASKED THE FIRING ORDER.
6: THIS IS NOT GUESSING THIS IS SERVICE MANUAL FACTS .
BANK 1> 1,2,3
BANK 2> 4,5,6
VIN U) Firing order 1-4-2-5-3-6
SEE HOW ALL THIS MATTERS?

Valves maybe shot

Do a Cylinder Leak Down Test

Had the same problem an old hose had a hole in it. changed hose,problem solved. also bank 1 is passenger side. i have a 2000 jaguar stype.

Fix the misfire. The Car is running lean to protect the catalytic converter because of the miss fire in that cylinder or cylinders the fuel is not being burned. Which can damage the cat.

OK, We'll cover the Diagnostic Test Codes (DTCs), starting with the standard definition set by SAE J2012 (Revised December 2007)
DTC P0171 "System Too Lean Bank 1"
DTC P0174 "System Too Lean Bank 2"
DTC P0301 "Cylinder 1 Misfire Detected"
DTC P0305 "Cylinder 5 Misfire Detected"
DTC P0316 "Engine Misfire Detected on Startup (First 1000 Revolutions)"

The "system lean" codes are pretty much telling you that there is way too much oxygen in the exhaust. There is too much oxygen on BOTH sides of the engine, and that is why you are getting codes for bank 1 and for bank 2. Bank 1 is the side where #1 cykinder is located and Bank 2 is the opposite side.

The misfire codes are pretty self-explanatory. #1 and # 5 cylinders are misfiring. The P0316 DTC is telling you that the misfire monitor is detecting a misfire as soon as the engine starts. This tells you that it is a very severe misfire and that the engine does not have to warm up and the car does not have to be driven to detect the misfire.

A misfire can be caused by many things it can be vacuum leaks, bad spark plugs, bad ignition cables, faulty ignition coils, fouled or malfunctioning injectors or injector circuits, blown head gasket, cracked cylinder head, burnt valves, etc.. etc..

However, look at the codes you have. Then look at the firing order for your engine. 2002 Mercury Sable is only equipped with a 3.0L 2V 6-cylinder engine.
The firing order is 1-4-2-5-3-6

Now if you take the firing order and split it in half, stack the two halves on top of each other, it looks like this:
1-4-2
5-3-6

When you look at the firing order this way, you can see that cylinders 1 an 5, 4 and 3, and 2 and 6, are "PAIRED" cylinders. They are exacly opposite in the firing order. Now, the cylinder only fires every second revolution of the crankshaft. With paired cylinders, one of the cylinders in the pair will fire on the first revolution and the other cylinder will fire on the second revolution.

Looking back at your codes, please note that the cylinders that are setting the misfire codes are paired cylinders.

Now the coil pack for your ignition is actually made up of three coils. Each coil fires a set of paired cylinders. If you look at the top of the coil, it will usually be marked with the cylinder numbers that each coil tower is supposed to connect to. The coil will look just like the firing order split and stacked as above.

With all of this said, I would say that it is VERY LIKELY that your misfire codes are being caused by a defective ignition coil.

The lean codes are a little different.

These are USUALLY caused by vacuum leaks which allow too much air into the engine that is not getting measured by the Mass Airflow (MAF) sensor and causes the engine to be getting too much air and not enough fuel (running lean).

I would take a good look at all of the vacuum hoses and lines. Ford is notorious for getting holes in the rubber parts that connect the PCV tubes.

If you do not find any obvious reasons for a vacuum leak, then you may want to fix the misfire codes, reset the computer memory, and drive the vehicle to see if the lean codes come back again. The misfires COULD be the cause of the lean codes. In a perfect world, this is not supposed to happen because the misfire monitors setting codes will not allow the oxygen sensor monitors to run and set lean codes. However, I HAVE seen cylinder misfires that have caused lean codes.

I hope this helps you to figure it out. Good luck!

I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

#1 is the egr position sensor #4 Is for single cylinder misfire so this could be the coil or a bad plug or wire ..but with fords should check for a vacume leak that can cause a misfire to .....#2#3 are 02 sensors before i would change them i would check the mass air flow sensor ..Hope this helps

Problem could be as simple as a vacuum leak around either of those cylinders. A vacuum leak can create a lean fuel mixure condition resulting in a miss fire. One thing to rememeber is that depending on the style of ignition in use. The opposing cylinder's spark plug and wires act as the return path for the unused voltage from the coils firing which is why you are having seemingly unrelated misfires. If either has a problem then the symptoms are shown in both cylinders.

have a look at the coil pack... it is numbered... now if it's like a 95 windstar the engineers had a sense of humour. it is 1 2 3 down one side then 4 6 5 down the other.... i didn't notice this when i changed my coil pack and couldn't figure out why it was missing.

Robert

1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6 1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6
4.0L Engines Firing Order: 1-4-2-5-3-6 DIS Ignition System