HELP!!!!! Ford 300 missing and backfiring.
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Cross-Country
Joined: Aug 2022
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HELP!!!!! Ford 300 missing and backfiring.
So my truck is sputtering and hesitating when I go half throttle or more and when I brought it to a shop they said that the piston was making contact with the spark plug on all 6 cylinders. (I’m not sure if they actually are or not). Does anyone have any ideas of what it could be. Also if you need more information let me know. Thank you for your time.
There has been like 6 different sets or spark plugs they said they were all doing the same. I’m going to get a set of motor craft ones from a ford dealership and put them in myself and see what that does.
There has been like 6 different sets or spark plugs they said they were all doing the same. I’m going to get a set of motor craft ones from a ford dealership and put them in myself and see what that does.
Last edited by Bigblock6obs; Aug 20, 2022 at 02:51 PM. Reason: More info
Thread Starter
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Cross-Country
Joined: Aug 2022
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So my truck is sputtering and hesitating when I go half throttle or more and when I brought it to a shop they said that the piston was making contact with the spark plug on all 6 cylinders. (I’m not sure if they actually are or not). Does anyone have any ideas of what it could be. Also if you need more information let me know. Thank you for your time.
There has been like 6 different sets or spark plugs they said they were all doing the same. I’m going to get a set of motor craft ones from a ford dealership and put them in myself and see what that does.
There has been like 6 different sets or spark plugs they said they were all doing the same. I’m going to get a set of motor craft ones from a ford dealership and put them in myself and see what that does.
More Turbo
Joined: Nov 2015
Posts: 702
Likes: 111
The 1995 4.9 has "D" dish pistons.
There is no way the top of the pistons come anywhere close to the spark plugs.
Take a spark plug out, bring the piston to TDC, look into the cylinder and see for yourself.
Is the spark plug gap being smashed closed?
This problem usually indicates a bad Ignition Control Module (ICM).
The ICM sits on a heat sink on the fender well back by the driver's side fire wall.
There is no way the top of the pistons come anywhere close to the spark plugs.
Take a spark plug out, bring the piston to TDC, look into the cylinder and see for yourself.
Is the spark plug gap being smashed closed?
This problem usually indicates a bad Ignition Control Module (ICM).
The ICM sits on a heat sink on the fender well back by the driver's side fire wall.
FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
I would say when the plugs are out and you look them over to see if the gap is closed or not to also do a compression test.
Also pmuller how do you know what year he is talking about as I dont see it listed?
So how bout the year and how may miles on the motor.
When was the last time a tune up was done?
Cap & rotor, plugs & wires, air / fuel / breather & PCV
And to make it really happy a oil & filter change.
Dave ----
Also pmuller how do you know what year he is talking about as I dont see it listed?
So how bout the year and how may miles on the motor.
When was the last time a tune up was done?
Cap & rotor, plugs & wires, air / fuel / breather & PCV
And to make it really happy a oil & filter change.
Dave ----
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Cross-Country
Joined: Aug 2022
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The 1995 4.9 has "D" dish pistons.
There is no way the top of the pistons come anywhere close to the spark plugs.
Take a spark plug out, bring the piston to TDC, look into the cylinder and see for yourself.
Is the spark plug gap being smashed closed?
This problem usually indicates a bad Ignition Control Module (ICM).
The ICM sits on a heat sink on the fender well back by the driver's side fire wall.
There is no way the top of the pistons come anywhere close to the spark plugs.
Take a spark plug out, bring the piston to TDC, look into the cylinder and see for yourself.
Is the spark plug gap being smashed closed?
This problem usually indicates a bad Ignition Control Module (ICM).
The ICM sits on a heat sink on the fender well back by the driver's side fire wall.
Thread Starter
|
Cross-Country
Joined: Aug 2022
Posts: 73
Likes: 0
I would say when the plugs are out and you look them over to see if the gap is closed or not to also do a compression test.
Also pmuller how do you know what year he is talking about as I dont see it listed?
So how bout the year and how may miles on the motor.
When was the last time a tune up was done?
Cap & rotor, plugs & wires, air / fuel / breather & PCV
And to make it really happy a oil & filter change.
Dave ----
Also pmuller how do you know what year he is talking about as I dont see it listed?
So how bout the year and how may miles on the motor.
When was the last time a tune up was done?
Cap & rotor, plugs & wires, air / fuel / breather & PCV
And to make it really happy a oil & filter change.
Dave ----
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FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
I can't see the plug gap closing unless someone installed the wrong plugs.
Nothing fancy just good old copper plugs is all it needs.
There have been posts of people using the newer plugs in older ignition systems and having issues could that be you also with newer type plugs?
Dave ----
Nothing fancy just good old copper plugs is all it needs.
There have been posts of people using the newer plugs in older ignition systems and having issues could that be you also with newer type plugs?
Dave ----
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Cross-Country
Joined: Aug 2022
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I can't see the plug gap closing unless someone installed the wrong plugs.
Nothing fancy just good old copper plugs is all it needs.
There have been posts of people using the newer plugs in older ignition systems and having issues could that be you also with newer type plugs?
Dave ----
Nothing fancy just good old copper plugs is all it needs.
There have been posts of people using the newer plugs in older ignition systems and having issues could that be you also with newer type plugs?
Dave ----
Lead Driver
Joined: Jun 2021
Posts: 5,219
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Here is the autolite plug his engine needs stock 1995 OP, does your plug cross to that number? and does your plug look like the left one? Your head rusty? My threads were rusted and not threading nicely and my plugs werent sealing and they would rattle loose!!! I used wire drill attachment, carb spray, and then towels to clean up the seat. I chased the threads with tool
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Cross-Country
Joined: Aug 2022
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Here is the autolite plug his engine needs stock 1995 OP, does your plug cross to that number? and does your plug look like the left one? Your head rusty? My threads were rusted and not threading nicely and my plugs werent sealing and they would rattle loose!!! I used wire drill attachment, carb spray, and then towels to clean up the seat. I chased the threads with tool
Lead Driver
Joined: Jun 2021
Posts: 5,219
Likes: 804
i got 5 out of the 6 motorcraft spark plugs, its still missing and cutting out but i was actually able to get up to 60 mph. Im going to get a 6th motocraft and see if that does anything. it only sees to be mising/cutting out under heavy acceleleration. if i ease into it it dosent do it and it seems to want to do it more around 30 mph vs any other speed.
Show us your wiring, distributor cap etc, show that
FTE Legend
Joined: Nov 2015
Posts: 30,876
Likes: 4,116
From: Angier, NC
Being it is a 95 with EFI it has a computer.
I think you said it looked good inside but have you tried to pull codes from it?
It can tell you what is going on that it dosenot like.
Dave ----
I think you said it looked good inside but have you tried to pull codes from it?
It can tell you what is going on that it dosenot like.
Dave ----
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