Cylinder 1 and 8 Misfire + unknown manifold code

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bluwarguy

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Oct 20, 2016
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Ram Year
1997
Engine
5.9 Magnum V8
I was driving to prom 2 days ago and accelerating hard when the check engine light started flashing. I immediately knew what it was doing so I pulled over and got out my OBDII reader to see what was misfiring. Both cylinders 1 and 8 had misfire codes and there was another one that said something about the manifold. In my stupidity I erased the codes to see if the problem would happen again instead of writing them down first. The only one that happened again was Cylinder 1 misfiring. The other 2 codes have yet to show up. It only does it under hard acceleration but if I take it slow it's fine. I've had misfiring problems before with the 8th cylinder due to oil caked on to it. I put on new spark plugs/wires/rotor/cap less than 1000 miles ago. I normally check my codes every now and then because I don't have any O2 sensors and those keep the light on.
 
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dapepper9

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Location
Iowa/Nebraska Border
Ram Year
2001
Engine
5.9L V8
1. Plenum
2. Put a new upstream 02 in, engine uses it for air/ fuel ratio. Downstream is just a monitor
 
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bluwarguy

bluwarguy

Member
Joined
Oct 20, 2016
Posts
70
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Ram Year
1997
Engine
5.9 Magnum V8
I'm betting it's my plenum. It's sucking oil FAST and with full synthetic it's getting expensive to keep up with. The manifold code was actually from my MAP sensor a while ago when I forgot to plug it back in. It hasn't misfired since though.
 
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