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1998 F150 4.6 Missing Under Acceleration

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1998 F150 4.6 Missing Under Acceleration

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  #1  
Old 07-28-2018, 12:30 AM
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Angry 1998 F150 4.6 Missing Under Acceleration

My grandfather's '98 F150 runs fine at idle, and light acceleration, but when he punches it, it starts missing and shaking and it acts like it doesn't want to live anymore. I have no idea what it could be, we replaced the plugs a while back with E3 Diamond Fires from O'Reilly. We just replaced the wires with OmniSpark, because my grandma doesn't like to spend a lot. I have seen a lot with these trucks being picky if they don't use Motorcraft brand everything. The truck has about 250k on it.
 
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Old 07-28-2018, 09:55 AM
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First, get rid of that E3 junk! That crap doesn't even work in Briggs engines... replace with Motorcraft.

Second get rid of those wires. Replace with Motorcraft.

Make sure you thoroughly check and double check (maybe even triple check) the gap on the plugs.
 
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  #3  
Old 07-28-2018, 10:27 AM
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Check the fuel pressure. Change the fuel filter if it is low or hasn't been changed in a while. Also, check for codes.
 
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Old 07-28-2018, 11:40 PM
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proven motorcraft plugs and wires from the beginning would’ve saved your granny some hassle and the cost of the garbage...
 
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  #5  
Old 07-29-2018, 10:56 AM
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These trucks respond well to Motorcraft ignition parts, other brands not so much.
 
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Old 07-29-2018, 03:00 PM
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You get what you pay for - OmniSpark is a cheap wire. At O'Reilly's, Motorcraft wires cost over twice as much. However, you can get Motorcraft wires from rockauto.com for half the price as the same ones at O'Reilly. You can also save on plugs too.

https://www.rockauto.com/en/moreinfo...382756&jsn=453
$64.79

https://www.rockauto.com/en/moreinfo...382756&jsn=476
$3.13 each
 
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  #7  
Old 07-31-2018, 12:51 PM
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Originally Posted by ManualF150 View Post
First, get rid of that E3 junk! That crap doesn't even work in Briggs engines... replace with Motorcraft.

Second get rid of those wires. Replace with Motorcraft.

Make sure you thoroughly check and double check (maybe even triple check) the gap on the plugs.
So I went out yesterday to look under the hood after I got home, and checked the wire on the cylinder that the code said was misfiring, (#3) and not to my surprise, I was able to push the wire down on the cylinder and it moved. Same with all other wires. These junk wires my grandma got to save money ended up costing her another $50 wasted. Ordered motorcraft wires, will be here Wednesday.
 
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Old 07-31-2018, 02:27 PM
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I'd also order some Motorcraft plugs - those E3's won't last.
 
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Old 07-31-2018, 02:48 PM
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Originally Posted by glc View Post
I'd also order some Motorcraft plugs - those E3's won't last.
My grandpa got motorcraft plugs because the guy at oreilly said the same thing. He thought about taking them back, Iíll tell him not to.
 
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Old 07-31-2018, 11:07 PM
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Make sure you use a torque wrench on the plugs - 28 ft/lb.
 
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Old 08-02-2018, 12:33 AM
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Originally Posted by glc View Post
Make sure you use a torque wrench on the plugs - 28 ft/lb.
Oh, thanks for saving me the hassle of trying to find the proper torque specs. Also, I heard somewhere that Ford changed the recommended oil from 5W30 to 5W20 because it gets to the timing setup faster. Is this true?
 
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Old 08-02-2018, 08:53 AM
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I think the switch had more to do with the tiny increase in fuel economy.
 
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Old 08-02-2018, 12:13 PM
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Originally Posted by Roadie View Post
I think the switch had more to do with the tiny increase in fuel economy.
Ah, OK then. I'm glad I found this site, otherwise I would not have known what I now know about the truck.
 
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Old 08-02-2018, 07:07 PM
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Originally Posted by Untrained View Post
Oh, thanks for saving me the hassle of trying to find the proper torque specs. Also, I heard somewhere that Ford changed the recommended oil from 5W30 to 5W20 because it gets to the timing setup faster. Is this true?
If you look up the torque spec for spark plugs in the factory manual, it will say 12 ft. lbs. which is WRONG. That light torque combined with about 4 or 5 threads that engage has led to spark plugs working loose and blowing out. If you torque them to 28 ft lbs as glc said, they won't blow out.
 
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  #15  
Old 08-04-2018, 02:04 PM
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Originally Posted by ManualF150 View Post
First, get rid of that E3 junk! That crap doesn't even work in Briggs engines... replace with Motorcraft.

Second get rid of those wires. Replace with Motorcraft.

Make sure you thoroughly check and double check (maybe even triple check) the gap on the plugs.
So, replaced the wires with motorcraft wires. Seemed perky and better than it would have been normally... at first. Then, down the road at a stop light, started shaking at idle, took off... no power AT ALL. Check engine light came back on telling me it was misfiring again. This truck is starting to make me very angry. Planning on plugs tomorrow. Edit: The truck is making a clicking noise when running. Maybe fuel?
 

Last edited by Untrained; 08-04-2018 at 03:53 PM.
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