My engine light came on and it seemed like it was miss fireing the codes said i think 304 and 302 was the prob so i replaced the plug wires it ran a little better the engine light went out but it still miss fires runs good at idle and being cold on start up. cold it be that sencer just after the air filter? thanks!!!
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the 4.6 L SOHC engine used in the 1997 F-150 has a spark plug firing order 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 / and the engine cylinders are numbered : passenger side of engine , front to rear , 1 , 2 , 3 , 4 drivers side of engine , front to rear , 5 , 6 , 7 , 8
There can be several reasons. A lot of times people look at the spark side of the problem and forget that fuel injectors also must work. The firing signal comes from the crankshaft sensor, then both the spark and fuel get a signal to fire.
When 2 adjacent cylinders miss, it can be a head gasket or the coil pack. I see that this problem is 7 months old so you have probably fixed it.
a factory weatherstripping on the hood leaks causes the cylinders 2 &3 on the pass side to misfire. pull the coils for the cyl. .take off boot with long spring inside, thats your plug wire. they are rusty, no? clean them up, put some dielectric grease all over the spring and reassemble. theres your prob!!!!
the cars ecu is not set up for this engine it still thinks you have a 4.2lt lump in it, and as far as the cars comuper is telling it the engine is claped out you need to reprogram the cars computer for the smaller engine
Everyone says to test out your DPFE sensor. This controls the flow of the egr. When the codes pull up, everyone thinks its the egr, but really its this little guy.
Take it by a shop and see if they can mess with the bugger. They usually run about $50+.