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Old Sep 15, 2019 | 12:43 PM
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BMO
Joined: Oct 2011
Posts: 23
Likes: 2
From: Maryland
Default Re: Random misfire at WOT

Today I tested the fuel pressure and it is a steady 55# up to 4000rpm (the highest it will go in Park). My lead isn’t long enough to run it out of the engine bay, so I can take it on the road with the gauge hooked up (though now that i say that, I do have an endoscope I could running under the hood). I also changed the crankshaft sensor with a new Bosch unit. The current one had been in maybe 20K miles. It is marked made in Germany, but not marked Bosch. Go figure.

After those two things, I took it for a drive and boom. Same problem. This time showing codes P0300, P0302, P0303, P0304, P0305 and P0306. Stop, shut down, restart and continue no problem.

Next up testing the spark plug wires and checking the plugs.
 
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