Knocking after changing spark plugs
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4th Gear
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Knocking after changing spark plugs
So I have a '95 F150 4.9L with 228k miles on it. I recently just changed to spark plugs, ignition coil and wires. We tried to do the distributor cap but it didn't fit properly and we swapped back to the old one. After we put it all back together and firied it up it started making a like knocking noise. If anyone has any ideas on what that could be I'd appreciate it.
Edit: I should mention the sound does go away when we disconnected the spark plugs so we don't think a rod.
Another edit: We went from copper to platnium plugs because that was all that was available. Idk if that will cause the knock but it may be necessary information.
Edit: I should mention the sound does go away when we disconnected the spark plugs so we don't think a rod.
Another edit: We went from copper to platnium plugs because that was all that was available. Idk if that will cause the knock but it may be necessary information.
Last edited by Trestyn; Aug 1, 2024 at 07:50 PM.
FTE Legend
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From: Angier, NC
Crazy things have happened when you dont run copper plugs in older motors like ours.
You said " the sound does go away when we disconnected the spark plugs" pointing to plugs.
I hope they are not too long and hitting the pistons then again it would close up the gap I guess?
Some will not have issues and others do we just dont know why that is so
Go back to copper plugs and see what happens.
Dave ----
You said " the sound does go away when we disconnected the spark plugs" pointing to plugs.
I hope they are not too long and hitting the pistons then again it would close up the gap I guess?
Some will not have issues and others do we just dont know why that is so
Go back to copper plugs and see what happens.
Dave ----
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So, using a different set of words, what are you saying?
The more people that go under the hood, the more problems you will have. Funny how the factory rarely has problems but the more the hood is opened, the more problems you get. Is it possible that someone in the past removed the distributor and the rotor is not pointing in the right place? I know this should not effect the noise since all you did is opened the hood, replace plugs, coil, and wires so if the rotor is not right, it was not right before you started.
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FTE Legend
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From: Angier, NC
Ok, this does not make sense to me but I got to ask. If you disconnected the spark plugs, the engine would not run and therefore, the noise would go away.
So, using a different set of words, what are you saying?
The more people that go under the hood, the more problems you will have. Funny how the factory rarely has problems but the more the hood is opened, the more problems you get. Is it possible that someone in the past removed the distributor and the rotor is not pointing in the right place? I know this should not effect the noise since all you did is opened the hood, replace plugs, coil, and wires so if the rotor is not right, it was not right before you started.
So, using a different set of words, what are you saying?
The more people that go under the hood, the more problems you will have. Funny how the factory rarely has problems but the more the hood is opened, the more problems you get. Is it possible that someone in the past removed the distributor and the rotor is not pointing in the right place? I know this should not effect the noise since all you did is opened the hood, replace plugs, coil, and wires so if the rotor is not right, it was not right before you started.
Thing is he is not running factory copper plugs just some high $$$ fancy plugs.
Dave ----
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4th Gear
Joined: Aug 2024
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Crazy things have happened when you dont run copper plugs in older motors like ours.
You said " the sound does go away when we disconnected the spark plugs" pointing to plugs.
I hope they are not too long and hitting the pistons then again it would close up the gap I guess?
Some will not have issues and others do we just dont know why that is so
Go back to copper plugs and see what happens.
Dave ----
You said " the sound does go away when we disconnected the spark plugs" pointing to plugs.
I hope they are not too long and hitting the pistons then again it would close up the gap I guess?
Some will not have issues and others do we just dont know why that is so
Go back to copper plugs and see what happens.
Dave ----
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4th Gear
Joined: Aug 2024
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Ok, this does not make sense to me but I got to ask. If you disconnected the spark plugs, the engine would not run and therefore, the noise would go away.
So, using a different set of words, what are you saying?
The more people that go under the hood, the more problems you will have. Funny how the factory rarely has problems but the more the hood is opened, the more problems you get. Is it possible that someone in the past removed the distributor and the rotor is not pointing in the right place? I know this should not effect the noise since all you did is opened the hood, replace plugs, coil, and wires so if the rotor is not right, it was not right before you started.
So, using a different set of words, what are you saying?
The more people that go under the hood, the more problems you will have. Funny how the factory rarely has problems but the more the hood is opened, the more problems you get. Is it possible that someone in the past removed the distributor and the rotor is not pointing in the right place? I know this should not effect the noise since all you did is opened the hood, replace plugs, coil, and wires so if the rotor is not right, it was not right before you started.
Hotshot
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No. I was thinking that the wires got put on the wrong cylinders but that could be possible with cheaply made wires.
Definitely would not hurt to try that.
Definitely would not hurt to try that.
FTE Legend
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From: Angier, NC
Swapping back to copper might be the play here. We just didn't have many options when we went looking for plugs. Might also have to double check they're all tight too. I talked to a mechanic saying that if their loose they make a popping sound that's nearly indistinguishable from a mechanic tick.
If that was the case I would not have bought the plugs there and gone to a different store for them.
I guess a loose plug could push compression out but when I had a plug blow out on a 460 in a van that sits right next to the driver / passenger I never heard anything before it was out
Dave ----
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If you have a very well insulated set of pliers and a leather glove, pull a plug wire at a time of the distributor cap. If the noise goes away with a specific cylinder disconnected, then you now have a place to begin looking for a problem. FYI, just cranking an engine with the ignition system disconnected is not going to do much for diagnosing a noise. Even a severe roof knock can go away if you cut the spark to the cylinder.
FTE Legend
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Posts: 30,886
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From: Angier, NC
We dont know why that is but if something is not right after you installed fancy plugs like the OP swap them out and see what happens.
He also has a 4.9 so dont know if that has something to do with it?
Dave ----
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