Power loss
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Junior User
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Power loss
Hey guys I've got a 95 f250 5.8 so I just replaced plugs and wires on my pickup because one of the wires had come in contact with my manifold and melted through but anyway I replaced the plugs while I was at it with ngk platinum plugs and it seems like I've got some power loss now could it be because of the plugs? Before I had motorcraft the mid grade ones
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Junior User
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Hey guys I've got a 95 f250 5.8 so I just replaced plugs and wires on my pickup because one of the wires had come in contact with my manifold and melted through but anyway I replaced the plugs while I was at it with ngk platinum plugs and it seems like I've got some power loss now could it be because of the plugs? Before I had motorcraft the mid grade ones
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Junior User
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I've heard that you should stick with motorcraft but u thought I'd give ngk a try
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Cargo Master
Joined: Jun 2010
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From: Iowa
You mentioned that your old spark plug wire melted through, I am assuming it was causing a misfire? And assuming it was misfiring did you drive it for a long that way?
I learned the hard way that driving any significant distance with the spark misfire will pump raw gas from that cylinder into the catalytic converter and do bad things to it and cause back pressure issues and power loss.
I learned the hard way that driving any significant distance with the spark misfire will pump raw gas from that cylinder into the catalytic converter and do bad things to it and cause back pressure issues and power loss.
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Junior User
Joined: Feb 2015
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You mentioned that your old spark plug wire melted through, I am assuming it was causing a misfire? And assuming it was misfiring did you drive it for a long that way?
I learned the hard way that driving any significant distance with the spark misfire will pump raw gas from that cylinder into the catalytic converter and do bad things to it and cause back pressure issues and power loss.
I learned the hard way that driving any significant distance with the spark misfire will pump raw gas from that cylinder into the catalytic converter and do bad things to it and cause back pressure issues and power loss.
Cargo Master
Joined: Jun 2010
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From: Iowa
I don't know what is considered acceptable for driving with a spark miss without damaging the cats but less then 20 miles home destroyed the driver side converter on my 99 mustang 4.6.... Looking at the front side of the cat it was completely pulverized from gas exploding in the honeycombs, literally no exhaust could pass through it and was forcing it through the EGR tube to the other side of the engine and with a significant loss of power.
Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
I've run NGK's on my trucks, but not the platinum tipped ones. I would run the standard ones. Platinum is a big headache in these vintage engines.
Another thing to consider, did you unhook the battery and let it sit for a bit and the reconnect it and drive the truck? It maybe using old learned strategies and this MAY help.
I would try letting the PCM reset and adapt to new strategies and if that doesn't do the trick, pick up some Autolite Copper or Motorcraft Copper plugs and call it a day.
Another thing to consider, did you unhook the battery and let it sit for a bit and the reconnect it and drive the truck? It maybe using old learned strategies and this MAY help.
I would try letting the PCM reset and adapt to new strategies and if that doesn't do the trick, pick up some Autolite Copper or Motorcraft Copper plugs and call it a day.
Cargo Master
Joined: Jun 2010
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From: Iowa
Just a random shot in the dark but it might be worth checking the timing, it isn't impossible for the distributor to move just a bit when messing with it and it isn't exactly a new truck so unless it's been done recently it be a good idea to do now.
My old F150 5.8 really came alive after setting the timing up to 12° advanced vs the 6° it was at stock. No cat's on that old beast either! Lol
My old F150 5.8 really came alive after setting the timing up to 12° advanced vs the 6° it was at stock. No cat's on that old beast either! Lol
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Just a random shot in the dark but it might be worth checking the timing, it isn't impossible for the distributor to move just a bit when messing with it and it isn't exactly a new truck so unless it's been done recently it be a good idea to do now.
My old F150 5.8 really came alive after setting the timing up to 12° advanced vs the 6° it was at stock. No cat's on that old beast either! Lol
My old F150 5.8 really came alive after setting the timing up to 12° advanced vs the 6° it was at stock. No cat's on that old beast either! Lol