Two Cylinders getting NO SPARK.
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
Two Cylinders getting NO SPARK.
This is a 1996 4.6L with two coil packs. On my car, two plugs coming from the drivers side coil pack are getting spark and the other two are not. I would think that if a coil pack were to fail that all four plugs on that coil would not get spark. So... I tried swapping the coil packs from left to right and I still got the same results, telling me it's most likely not a coil pack.
As part of this excursion I have replaced both the wires and spark plugs, cleaned the connections to coils and still have the same results. I am stumped here and I am thinking that it may be the harness or possibly the computer. ??? (hopefully not)
My main reason for posting is to see if anyone else has ran across these symptoms and can help me to not replace any more parts than I have to.
THANK YOU IN ADVANCE for your help.
As part of this excursion I have replaced both the wires and spark plugs, cleaned the connections to coils and still have the same results. I am stumped here and I am thinking that it may be the harness or possibly the computer. ??? (hopefully not)
My main reason for posting is to see if anyone else has ran across these symptoms and can help me to not replace any more parts than I have to.
THANK YOU IN ADVANCE for your help.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Are you sure they aren't getting spark and it's not a fuel problem?
I believe your ignition is a waste spark, so two or even all four towers fire at the same time. If it's just half of the pack, then you may have a bad connection to the pack or a bad coil driver.
I believe your ignition is a waste spark, so two or even all four towers fire at the same time. If it's just half of the pack, then you may have a bad connection to the pack or a bad coil driver.
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
Thank you for your response. I am positive that it's a spark issue. The two that aren't getting spark from the coil pack I believe are cylinders 8 and 3 (don't quote me on that) The connection at the pack is good but I have no idea where to check further up the harness.
So what is a coil driver? Thanks again.
So what is a coil driver? Thanks again.
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
So I just read up on this ignition and it is a EDIS8 waste spark type. I gather that the dead holes are most likely 8&5 since they are the corresponding plugs. Now to figure out why those two are down.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
If you have swapped coils with no change, replace the wires and spark plugs, then it is in the harness or PCM. I don't know for sure on your coil, but most coils have a constant hot, and a trigger which is hot until it is supposed to trigger and it goes to ground. I would imagine that you have a 3 or 4 wire harness going into the coils and that two of those are triggers, so I would start with checking the others for 12v. Hopefully all of them have 12v or atleast all but one.
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
Trending Topics
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
well, I guess you can disregard the previous post. I found this in a manual...
<i>On 1996 vehicles, there is no longer a stand-alone Ignition Control Module (ICM). The ICM has been integrated into the PCM. The Profile Ignition Pickup (PIP), Spark Output (SPOUT), Ignition Ground (IGN GND), and Ignition Diagnostic Monitor (IDM) have also been enclosed in the PCM. </i>
Looks like there is no replacing seperate parts, gotta replace the whole PCM :-(
<i>On 1996 vehicles, there is no longer a stand-alone Ignition Control Module (ICM). The ICM has been integrated into the PCM. The Profile Ignition Pickup (PIP), Spark Output (SPOUT), Ignition Ground (IGN GND), and Ignition Diagnostic Monitor (IDM) have also been enclosed in the PCM. </i>
Looks like there is no replacing seperate parts, gotta replace the whole PCM :-(
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Are you sure you have a 96 F150 with a 4.6? That isn't even possible according to the service manual.... Check your 8th digit in your VIN.
N=5.0
H=5.8
G=7.5
Now if you're working on something other than an F150.... that would be nice to know.
Steve
N=5.0
H=5.8
G=7.5
Now if you're working on something other than an F150.... that would be nice to know.
Steve
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Originally Posted by BIG-FUJIMO
If I'm not mistaken I don't think ford even made a F-150 that year because of the transition from old body style to new
I'd suspect he actually has a MY 97 produced in 96. The 10th digit of the VIN and the emissions certificate will tell what MY it is and the decal on the doorframe will tell when it was produced.
In any event, the ignition control functions are integrated into the PCM for all 4.6L F-series applications.
Steve
Thread Starter
|
New User
Joined: Sep 2007
Posts: 7
Likes: 0
Any idea of where I can get the specs for testing the 3 input wires? I am getting a positive from all 3 when plugged in. I believe the triggers are teh two outer prongs. When I test the prong on the good side I get voltage and the engine stumbles a little bit. When I test the prong for the two dead cylinders I get voltage but no change in how the engine runs. Also, I know I shouldn't have done this but I crossed the wires so that the prongs were reversed and sure enough, the two dead cylinders fired.
Kinda confused about both prongs getting voltage tho.. I'm only using a test light.
Kinda confused about both prongs getting voltage tho.. I'm only using a test light.
