No spark on 2-3, ecotech

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?

Yes, they are interchangeable, as long as both will plug into the coil pack assembly, they should be fine. Coil issues? If you still have issue after new coils, check the ignition control module- igniter. The igniter is what controls the coil circuit when the pcm /ecu signals for a spark.

3.7 V6, mileage?

most likely the HV wires bad.

then bad coil pack.

did you check spark directly at the coil pack?

i use 2 known good HV wires to do that and 2 good test spark plugs.

both plugs grounded to engine (shell)

that is how you test any wasted spark coil pack. 3 coil pack.

if that fails the FSM shows, unplugging it and check the coil resistances. if wrong the pack is bad,

keep in mind the res. can read ok and coil be bad ,due to internal insulation break down (internal shorts)

if thats ok. the resistance , make sure the wires are not (primary)

to the coil (the low voltage connnector)

if that is ok, its mostly likely a bad coil, (pray not bad PCM)

if tool-less? start with cheap parts , work to expensive. (guessing)





now wasted spark 101.

if one line opens , both spark plugs die. no spark

the wasted spark is wired in SERIES. ( like Christmas lights)

the magic cuts cost of 6 coil\'s.

so if the HV wires are say, cheap , carbon wire and open

you lose, both spark plugs. use MAG wire and end this issues.

get some nice NGK mag wire or Bosch Mag wires.

you can see i hate carbon wire. for good causes.

(carbon string wire)

mag wires is real wire that is coil spun and is inductive. it

has the correct impedance but is not a resistor its and inductor.

and lasts the longest , and worth every penny.

Error Code: P0303
Description:
Cylinder 3 - Misfire Detected
Possible Cause:
Wiring harness, igniter and fuel injector connectors.
Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression, cylinder No.3. (check valve clearance and throttle plate for excessive wear)
Engine control module (ECM).

change ignition module

Hello Vance.
Not too likely a fuel injector problem.
The ignition system on thes engines were much more prone to bad coils and spark plug boots.
Remove the cover again and inspect carefully the rubber boot that go over the spark plugs for burn marks.
If they appear Ok do the same on the coil/module assembly.
I believe the boots are available separately from the coil/module.
When you buy the parts required also get some di-electric grease and apply a thin layer to the inner part of the boot at the spark plug end.
Hope your repair goes well.

I would bet it is one of the two coil packs, the modules rarley go bad.to make certain you can take the two coils off and switch their locations
just make sure you put the spark plug wires back on the coils as if you did not switch the coils. there are two small bolts holding each coil on. PLEASE rate my answer because I am new on here. [email protected]

If it's the four cyl., the first coil pack bolts over the #2 spark plug. The #2 coil pack wire plugs into #3 spark plug. The number two coil pack bolts directly over the number four spark plug, and the #2 coil pack wire plugs into the #4 plug. The firing order is 1-4-2-3.

it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
they should be hooked like this.

have you changed the ignition wires? perhaps firing order crossed? if not coil pack or ignition wires faulty how do you know it is not "FIREING" on 1 & 4 have you tested it with a spark tester tool???