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Should you change spark plugs after switching fuels?

jayroca

jayroca

Banned
Ive been on E85 for quite some time but i havent swapped plugs ... Been driving the car for 2 months on E85 and the car has been great on a 2.8 pulley with NO KNOCK afr is 14.7 and about 11.3 at WOT but it bogs somewhat like its misfiring somewhat but no knock or anything whatsoever ... Havent replaced the fuel filter i have a high flow filter which i will install it this weekend. Should i replace the plugs? It feels like its narrowing down to the plugs because the way it feels.. Car has a upgraded pump.. Fuel pump rewire plugs are autolite 104s shoulds i try 103s gap them to 55? thanks

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i'm not on e85 but I had a bogging and stupid high kr for a while. changed to a fresh set of plugs and wires and problem gone. plugs did not look good at all.
 
Yeah ima do the plugs tomorrow... And fuel filter and see what happens

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i need to get a pic of the plugs i pulled out of a exploder the other day. one side all 3 plugs had eaten the electrodes to nothing. gap was over 0.100 the other 3 were 0.80 spec is 0.52-58
 
ScottyDoggs said:
i need to get a pic of the plugs i pulled out of a exploder the other day. one side all 3 plugs had eaten the electrodes to nothing. gap was over 0.100 the other 3 were 0.80 spec is 0.52-58
Click to expand...
Im really thinking its the plugs now scotty... Did a run last night against my buddy and my kr went up to 5* to 7* and it never did that so its gotta be the plugs

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Just to update car runs wayy better with the new plugs... Idle is great and my wot pulls feel great so that was the issue.. Thanks for all the help guys

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High flow fuel filter is a scam, FYI.

It's a factory GM filter.

Also...after a few tanks of corn, you'll want to change the filter anyways, just for the sake of anything in the tank getting knocked loose. It's a $10~ deal that wouldn't hurt at all.
 
blueguy said:
High flow fuel filter is a scam, FYI.

It's a factory GM filter.

Also...after a few tanks of corn, you'll want to change the filter anyways, just for the sake of anything in the tank getting knocked loose. It's a $10~ deal that wouldn't hurt at all.
Click to expand...

Guess i got scammed :( ....

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Scottydoggs said:
i need to get a pic of the plugs i pulled out of a exploder the other day. one side all 3 plugs had eaten the electrodes to nothing. gap was over 0.100 the other 3 were 0.80 spec is 0.52-58
Click to expand...

Scotty I did the dreaded Ford 5.4 spark plug swap for my Grandpa yesterday. Cylinder 8 had a misfire, he wanted to change the coilpack and plug. I bet him money it was just the plug because truck hit 150k WITHOUT ever being changed. After praying every turn of my ratchet, it was free! In one piece!
The iridium was completely gone! Word of advice to everyone change your iridium plugs every 100k or as soon as you can
 
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In a 5.4, remove the plugs every 30-50k to prevent build up on the threads, you don't have to replace them but just remove and clean them.

Yay for getting side tracked.
 
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