Threw a code today... - Toyota 4Runner Forum

mendozer · 04-21-2019, 06:18 PM

Driving back from the coast today it threw a code when i stopped for coffee. P0306 engine misfire. My initial thoughts were spark plugs and it wires since I'm likely due for it.

But also, "vsc off" and "vsc trac" lights were on. That's not related to a misfire is it? The scangUge only reported one code. My other thoughts were if the rear traction sensor got wonky from driving on the sandy beach. But this was a solid 1.5 hours later. Thoughts?

Ed_C · 04-21-2019, 07:57 PM

VSC and TRAC lights will turn on when the check engine light does.

mendozer · 04-22-2019, 02:04 AM

ah ok. So I'll get around to the sparks and see if that does it.

mendozer · 04-25-2019, 02:09 AM

Today I fixed it. Wasn't sure exactly what it was but didn't want to waste time testing everything. I have no idea how old the plugs, coils, or wires were so I replaced all three. Aside from having spark plug socket issues (rubber gasket falling out, disconnecting from extension and getting stuck in the tube, etc) it was a maybe 2 hour process. I was trying to not remove certain things, but after struggling a bit ended up removing more things for access. NGK plugs and wires, and some coils I found on Amazon all for maybe 100 bucks maybe less.

JohnMc · 04-25-2019, 01:26 PM

That's the best P0306 you can get - plugs.n-wires.

Mine was a bad injector, which involves a bit more work.

mendozer · 05-11-2019, 02:07 AM

I'm not in the clear! Today it threw the p0306 again while in traffic. I reset the scanguage, then about 3 hours later it came on again, this time p0300. So I know it's not plugs, wires, and coils, yet somehow changing those three bought me about 2 weeks of code free driving.

What's next? I've been reading about fuel pressure testing, fuel injector testing, etc. I'm looking for least invasive first. I have a fuel filter I've been meaning to install, maybe I'll start there.

jgue467 · 05-12-2019, 07:34 AM

Yeah probably fuel system next to check based on FSM's suggested list/order of debugging a P0306:

Open or short in engine wire Connector connection
Vacuum hose connector
Ignition system
Injector
Fuel pressure
Mass air flow meter
Engine coolant temp sensor
Compression pressure
Valve clearance
Valve timing
PCV valve and hose
ECM

Luck and enjoy the runner.

mendozer · 05-14-2019, 02:09 AM

did the fuel filter Sunday. Then today P0306 came back on. Guess it really is cyl 6. I looked up how to test the injector, but what about the other things? Are these quick voltmeter tests or replacing parts and "wait and see" approach?

DaMonkey · 05-14-2019, 02:43 AM

I’m thinking you have a clue in that new plugs bought you 2 weeks and then it’s cycling quick again.

2 weeks seems fast to burn a new plug I’d guess fouled, but you got 2 weeks from new ignition and now it’s gone.

Start by pulling plug and inspecting. Swap w a plug other head and see if it buys you time again. Maybe leak down test is in order.

Driving in sand that day can load the motor pretty heavy. That by itself shouldn’t damage a motor but if ignition components were overdue or dirty MAF or improper fuel pressure, could cause something like piston ring damage.

Just a thought but I’d check the plug.

FunBobby · 05-14-2019, 03:16 AM

Just went through this, it's probably an injector, you can read through my build thread and see the process of elimination I went thru

mendozer · 05-15-2019, 02:22 AM

I guess it's not that bad of an idea to just pull them and have them serviced. My valve cover gasket doesn't leak, but again, it's one of those "might as well since the top's off!"

19963.4lsr5 · 05-15-2019, 08:49 AM

Ohm out the injector cold not hot to test it

Sent from my iPhone using Tapatalk

mendozer · 05-23-2019, 09:11 PM

Disassembled the intake assembly and TB last night. being an idiot, I accidentally removed two more bolts unnecessarily. What are those? The shiny holes in the picture, just above the valve covers. I couldn't find names of those or torque values. they're 12mm bolts, fairly long, and have thick shoulder washers.

gamefreakgc · 05-23-2019, 10:49 PM

Quote:

Originally Posted by mendozer

Disassembled the intake assembly and TB last night. being an idiot, I accidentally removed two more bolts unnecessarily. What are those? The shiny holes in the picture, just above the valve covers. I couldn't find names of those or torque values. they're 12mm bolts, fairly long, and have thick shoulder washers.

Picture didn't load. Going from memory, it might have been intake manifold bolts.

mendozer · 05-23-2019, 11:14 PM

You intake manifold bolts. Just found the picture in Haynes manual and put them back on

Turns out the ohms were all spot on 14.0. But I ordered reman injectors anyways and I'll send these in for core charges. after all this is what's left to hope for. There was some nasty red junk mixed in with debris on the driver front corner (near injector 1?) the valve cover didn t seem like it was leaking. I guess it wouldn't hurt to do those too, but buggy i don't want to

Site Navigation