So lost!!
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5th Wheeling
Joined: Mar 2024
Posts: 36
Likes: 1
So lost!!
I’ve got a 90 f150 trying to chase down a no start spark issue. I’ve replaced icm, coil, ignition switch, computer and distributor. I believe it all mostly boiled down to a bad ignition switch. I have power to coil, spark from coil. Rotor is turning, I also have very weak spark from distributor to plug wires. Almost intermittent spark. I have a lot of time and money tied in this truck, would love to get this thing in the road. Thanks for the help.
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
You're gunna need a volt meter to figure this one out. How many volts is the ignition coil getting while you're cranking the engine? If you use a test light on the negative side of the coil, does it flash consistently while you're cranking?
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
It's looks like it should be enough to get her started.
Are you 100% sure you have the distributer installed correctly? Alot of the time, the owner installed the distributer to fire at Top Dead Center on the EXHAUST stroke, instead of the COMPRESSION stroke.
Are you 100% sure you have the distributer installed correctly? Alot of the time, the owner installed the distributer to fire at Top Dead Center on the EXHAUST stroke, instead of the COMPRESSION stroke.
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5th Wheeling
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5th Wheeling
Joined: Mar 2024
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1)unplug spout connnector
2)remove #1 plug
3)turn engine over by hand until air pushes from plug hole
4) continue to turn engine by hand until tdc mark on balancer
5)point rotor toward #1 and install distributor
does this seem basically correct ?
I live in a small town and I’m at the point now where having a garage do it is out of the question, and I’m pretty limited as far as having anyone locally assist me hands on so it’s just me and what I can find on the forums.
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
[
1)unplug spout connnector (this has nothing to do with clocking the distributer correctly)
2)remove #1 plug
3)turn engine over (clockwise, when looking from the front) by hand until air pushes from plug hole
4) continue to turn engine (clockwise) by hand until tdc mark on balancer
5)point rotor toward #1 and install distributor
does this seem basically correct ?
Repeat steps 2-4 with the distributer installed as it is. When you got it lined up on TDC on the compression stroke, remove the distributer cap and see which sparkplug wire terminal it's pointing to. It should be pointing at #1.
You can also stick a wooden dowel or a plastic stick in the #1 sparkplug hole and make sure the piston is really at TDC. Sometimes, timing marks get screwed up or changed, and they're no longer accurate.
2)remove #1 plug
3)turn engine over (clockwise, when looking from the front) by hand until air pushes from plug hole
4) continue to turn engine (clockwise) by hand until tdc mark on balancer
5)point rotor toward #1 and install distributor
does this seem basically correct ?
Repeat steps 2-4 with the distributer installed as it is. When you got it lined up on TDC on the compression stroke, remove the distributer cap and see which sparkplug wire terminal it's pointing to. It should be pointing at #1.
You can also stick a wooden dowel or a plastic stick in the #1 sparkplug hole and make sure the piston is really at TDC. Sometimes, timing marks get screwed up or changed, and they're no longer accurate.
Thread Starter
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5th Wheeling
Joined: Mar 2024
Posts: 36
Likes: 1
[
[s]1)unplug spout connnector (this has nothing to do with clocking the distributer correctly)
2)remove #1 plug
3)turn engine over (clockwise, when looking from the front) by hand until air pushes from plug hole
4) continue to turn engine (clockwise) by hand until tdc mark on balancer
5)point rotor toward #1 and install distributor
does this seem basically correct ?
Repeat steps 2-4 with the distributer installed as it is. When you got it lined up on TDC on the compression stroke, remove the distributer cap and see which sparkplug wire terminal it's pointing to. It should be pointing at #1.
You can also stick a wooden dowel or a plastic stick in the #1 sparkplug hole and make sure the piston is really at TDC. Sometimes, timing marks get screwed up or changed, and they're no longer accurate.
[s]1)unplug spout connnector (this has nothing to do with clocking the distributer correctly)
2)remove #1 plug
3)turn engine over (clockwise, when looking from the front) by hand until air pushes from plug hole
4) continue to turn engine (clockwise) by hand until tdc mark on balancer
5)point rotor toward #1 and install distributor
does this seem basically correct ?
Repeat steps 2-4 with the distributer installed as it is. When you got it lined up on TDC on the compression stroke, remove the distributer cap and see which sparkplug wire terminal it's pointing to. It should be pointing at #1.
You can also stick a wooden dowel or a plastic stick in the #1 sparkplug hole and make sure the piston is really at TDC. Sometimes, timing marks get screwed up or changed, and they're no longer accurate.
Logistics Pro
Joined: Nov 2013
Posts: 3,921
Likes: 1,191
From: Mojave, Ca
Well, you can conclude that's it's not installed correctly. It may be pointing at any of the other 7 cylinders. If it is, the engine won't run.
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5th Wheeling
Joined: Mar 2024
Posts: 36
Likes: 1
okay so after double checking and confirming, getting on the compression stroke, then bumping it on over to 0 degrees tdc, it looks like the rotor is pointed towards right around #5. Whats my next move? Thanks again!!