General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Routing for spark plug wiring ?

Old Aug 13, 2017
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MaDMaXX's Avatar
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Routing for spark plug wiring ?

I'm about to replace my ignition wires, however the PO put some 8mm Denso wires on it, and honestly, i don't know if it's just bad from the factory, or if they made a mess of the routing.

Does anyone know if there is a reference for how to route the wires, including the clip points?
Or, if anyone still has the factory wires/kept the factory routing when they replaced?
 
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Old Aug 13, 2017
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I'll take some photo's of mine later.
Not sure if that's the way they're supposed to be, but I'm pretty OCD about where things go, so it looks nice and neat.
 
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Old Aug 13, 2017
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Thanks, me too for the most part, i hoped someone else would be too :)
 
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Old Aug 13, 2017
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Hope these help.
The one where I have my hand in, is where it clips onto the valve cover bolt/post.
I got my bolts mixed up, so that photo shows where there is supposed to be a stud.
 
Attached Thumbnails Routing for spark plug wiring ?-100_2010.jpg   Routing for spark plug wiring ?-100_2011.jpg   Routing for spark plug wiring ?-100_2012.jpg   Routing for spark plug wiring ?-100_2013.jpg   Routing for spark plug wiring ?-100_2014.jpg  

Routing for spark plug wiring ?-100_2015.jpg   Routing for spark plug wiring ?-100_2016.jpg  
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Old Aug 13, 2017
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Oh excellent, thanks, just what i was looking for.

My NGK leads will arrive this week, the Denso's on there right now are way longer than in your pictures, it's a massive mess :(

They're also covered in oil and some other gunk, got some work to do in there.

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Last edited by MaDMaXX; Aug 14, 2017 at 10:42 AM.
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Old Aug 14, 2017
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The plastic manifold on your 2002 seems to really lean towards the drivers side, or does it just look that way from the angle of the photo ?
It looks like it's quite difficult getting at the plugs on that bank.
 
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Old Aug 14, 2017
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Hmm, it's probably just the angle, the camera is almost directly above the passenger fender and slam panel at the front. I didn't feel the plugs were any harder on that side Vs this one.
 
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Old Aug 14, 2017
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It's probably where your coil pack is mounted that makes it seem that way.
Yours is mounted on top of the passengers valve cover while mine sits off to one side on the upper intake manifold.
 
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Old Sep 21, 2017
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I just received my wire set (NGK) and i'm noticing that your coil pack splits, or is split left to left, and right to right.

Mine and another reference one i saw, has the right side of the pack serving the other side of the engine, and vice versa.....
 
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Old Sep 22, 2017
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Your coil pack is turned around so the connection is closer to the middle of the engine, mine is the other way around.
So the wires would be routed differently.

You could turn the coil pack the other way if the wiring loom would allow the length.
 
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Old Sep 22, 2017
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Ahh, yeah, all i can find is a single reference to older Rangers having the coil pack oriented 180 from this.

Though yours being only a '99, i would have thought they'd already be this way round now!!

Anyway, i pulled all the cable clips out/off last night and set them aside for cleaning, the drivers side bank were all fitted backwards, holding the cables against the engine, and the cables were twisted round the back of the engine.

On top of that, at least one wasn't setup correctly and couldn't be mounted on it's post as it was pulled too tight, causing it to sit up about 4 inches from where it should be.

Anyway, there are *no* guides or pics anywhere of HT lead routing, which i find a little weird, but i already thing Ford's routing is terrible, i mean, some of these cables are hella long, for no good reason at all!!
 
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Old Sep 22, 2017
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Things were changes quite a bit when Ford went to the plastic upper manifold.

Obviously Ford had a way of installing the wires at the factory, but it's not critical.
One wants to keep the engine bay looking as tidy as possible though.

Start with your longest wire and the furthest distance, using the clips along the way that's closest to the path to get to "that" spark plug.
Keep going with next shortest wire until your done.

If a wire is too long, take a longer path keeping to the clips as much as possible.
Be carful not to let a wire rub up against things that will eventually cause chafing.

New cars are much simpler, no more coil pack, each spark plug has its own coil, so all there is are wiring loom connections up to each individual coil.
It would look similar to the loom going to each injector.

When I put my wires back in after the engine rebild it took a 2 or 3 goes to get right, or at least to something that looked neat and tidy.
 

Last edited by Jeff R 1; Sep 22, 2017 at 12:29 PM.
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Old Sep 22, 2017
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Yeah, yours looks right, and i agree with wanting to keep it tidy.

For some reason it hadn't occurred to me to start with the longest, but it makes the most sense - and i'm absolutely going to using all the guides, they exist for a reason
 
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