P0306 Error
Mileage: 155955
MPG: 13
Date: December 23, 2014
A few days ago I get the dreaded P0306 error. Truck is stumbling and gets really rough anything below 2000 RPMs. If I'm accelerating hard the CHECK ENGINE light starts flashing but then stays solid otherwise. After doing some research on here, I'm convinced it's the fuel injector. But I had to drive almost 150 miles to get back home with the P0306 error. By the time I get home my once full tank is almost empty. Later I calculated 13 mpg vs the usual 18 mpg. I'm thinking the injector must be pushing out some serious gas. I get out of the truck and I can smell gas. I'm hoping I didn't do any long term damage, cats? Now I'm hoping it's just a spark plug or wire. But I immediately order a fuel injector off ebay ($43) anyway, which won't come until tomorrow. So today I was hoping to fix my problem by just changing the spark plugs and wires. I was only going to change cylinder number 6, P030X, where X equals the cylinder number, bc it was raining but I got lucky and rain subsided so I did all 6 plugs. Fortunately I had spark plugs and wires already, I was putting it off bc I was scared of doing it. But in reality it was pretty easy.
I read up on these
http://www.toyota-4runner.org/3rd-gen-t4rs/59008-how-installing-3rd-gen-spark-plugs.html
and
4Runners.org - Changing Your Spark Plugs
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I had these plugs
Denso (3194) K16TR11 Traditional Spark Plug
http://www.amazon.com/gp/product/B0...s2&tag=nycfoosball-20&linkId=YV4ZSVHIBPGWDFGO
Just saw it says on amazon it doesn't fit my vehicle.
and these wire
NGK (4412) TE66 Wire Set
Amazon.com: NGK (4412) TE66 Wire Set: Automotive
I also went out to NAPA and got a 12" extension and universal joint. I ended up not needing the universal joint. You'll need a 5/8 spark plug socket.
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I started with cylinder number 6, driver side towards the rear of the vehicle. I read that this would be a pain, but it was pretty easy. Just pulled the wire and slide the 12" extension coupled with another extension I had, probably like a 4" and unscrew the plug. There's a rubber hose in the way but it's pretty flexible.
This was my number 6 wire. It looked scorched.
This was my number 6 plug. Quad pronged, Bosch Platiums.
Here are all my plugs. They're all pretty black.
I re-installed using the same spark plug socket, it held the plug pretty well. I hand threaded the plug and torqued it down to 13 ft/lbs. I put some anti-seize on the plug and some die-electric grease at the top/lip of the boot on the spark plug wire. I did one plug/wire at a time so I couldn't mess up the order.
The other side (passenger side) I removed the flexible tubing (air silencer thing), I think I could have left the airbox in, but I took it out, I was hoping to clean the MAF but didn't have time. Pretty easy. Taking out the coils, I left the eletrical connectors in bc I always end up breaking those things. Everything went fine without taking off the connectors. The rubber part in the coil is pretty flexible.
Overall changing plugs and wires is pretty easy. I put it off bc I was scared to do it, but it's easy. Took me 1.5 hours in the rain, going fairly slowly. It fixed my P0306 problem immediately. Drives much better. It got rid of the bogging feeling I had and the truck is much peppier. I'll conclude that my spark wire failed, unfortunately I have no idea when they were last changed. At least I do know they were changed since they had the quad sparks in it.
Maybe this will increase my MPG more. I also threw in a bottle of
Red Line (60103) Complete SI-1 Fuel System Cleaner - 15 Ounce
I'll update after I put some miles on it.