P0300 p0307
#1
P0300 p0307
I installed some pacesetter it headers on my 97 Dodge Ram and discovered a misfire. Has brand new o2 and was fine before the install. Later found out the o2 was plugged in all the way. Smoothed our just s little bit. Put plugs and wires on as well as a cap and rotor. Misfire got a little bit better. Almost non existent until under heavy load in over drive.no misfire code had been stored after all of that. I put a free flowing dual muffler exhaust on my truck and now the misfire is at idle and at cruising speeds. I found a vacuum leak and sealed it up as well as putting the exhaust on. When it started misfiring i can hear an after-fire (unburned fuel in the exhaust igniting) as if a cylinder isn’t firing like it’s supposed to. (#7) I’ve spent lots of $$$ tracking this down and it its a roller coaster. I know my plenum gasket is going bad but burns less than 1/4 per oil change as it sits right now. I was thinking maybe coil but I was told it will either work or it won’t. Then I thought maybe crank sensor. Was told that’s very rarely an issue and doesn’t usually cause a misfire. Later informed it could be a knock sensor. I’m doubting fuel relation simply because the misfire was bad then better then bad again as i fixed issues. I disconnected the battery to let everything reset. Any help is appreciated. I attempted to put as much info as I can so people have an understanding of what’s going on. Thanks I’m advance!
#2
It's not the knock sensor, as your truck doesn't have one. May be a clogged injector, cracked heads, failing crank sensor, or a selection of other causes. You have done the most obvious fixes already, but, may want to look at the plug wire routing TSB in the FAQ section here. Beyond that, think I would consider a compression/leakdown test. Wanna fix the plenum too......
#3
It's not the knock sensor, as your truck doesn't have one. May be a clogged injector, cracked heads, failing crank sensor, or a selection of other causes. You have done the most obvious fixes already, but, may want to look at the plug wire routing TSB in the FAQ section here. Beyond that, think I would consider a compression/leakdown test. Wanna fix the plenum too......
#5
#6
Replaced brand new a month or so again when the pacesetter headers went in. It may be the plenum gasket leaking right by the #7 cylinder causing it to lean out with a much less restrictive exhaust system.
#7
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