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2002 LS430 running rough DTC P0307 clylinder 7 misfire. check engine flashing VSC Off started yesterday and I am asking advice on where to start. I am guessing I will pull the plug and take a look for starters. What order would you guys change parts. plug, plug wire, coil pack, fuel injector, MAF? Need to get this running right today. Thanks for any help.
Let's start with the basic... Check to see if spark plug #7 can actually spark by following the procedures below. Note: if you don't have a new spark plug on hand, you can start with the existing spark plug. The point is to make sure the spark plug is receiving power.
Sounds good will check when I get home. I'm at work right now. I will pick up a plug on the way home as well. BTW what is the gap setting for the plug on the LS430? So going through the scenarios...if no spark, change plug?...if still no spark change coil over plug?....if spark change injector?
Last edited by hippchip; 11-26-17 at 07:24 AM.
Reason: Add info
Cylinder #7 is in the back near the battery and is known to be the most difficult spark plug to get to. Give the engine enough time to cool before starting your work and take you time.
Cylinder #7 is in the back near the battery and is known to be the most difficult spark plug to get to. Give the engine enough time to cool before starting your work and take you time.
I thought it was in the back on the other side. That's just great. When I pulled that coil out the boot stayed or wasnt there cant really tell but guessing it stayed since im having trouble getting the plug out.
Cylinder #7 is in the back near the battery and is known to be the most difficult spark plug to get to. Give the engine enough time to cool before starting your work and take you time.
Actually, cylinder 7 is the back cylinder on the drivers side...
Cut a couple of short lengths from a wire coat hanger and form a hook on each to grab at the bottom of the spark plug boot. The boot material is likely to be hardened from years of extreme heat, and may fall apart. Please use extreme caution to avoid leaving small pieces behind because they can fall down into the cylinder once the spark plug is removed.
Alternately, you can use a long and thin screwdriver to break apart the hardened boot, then use compressed air to blow the pieces out before removing the spark plug.
So I used a scribe and got most of it out in one piece. then I used a shop vac and sucked out what I could. When I pulled the plug out there was a small piece stuck to the plug from oil. I changed the plug and coil that I got from advance for $58 total SK20R11 plug and disconnected battery while I worked. hooked everything back up and running good with no check engine or VSC off or red triangle. Thanks to everyone for all the help!
11-26-17, 05:59 AM
2002 LS430 running rough DTC P0307 clylinder 7 misfire. check engine flashing VSC Off
