yarosig

Here's some background info, I bought this 4runner, 203,000 miles runs like new, well taken care of, and pinged a bit because of the supercharger. I put some NGK 2 steps colder single electrode spark plugs(gapped a bit) and the pinging situation got a little better. So randomly I start up my car start driving and under heavy load on low rpms it studders, so I adapt my driving style and shift higher and go easy on the gas. Now it has gotten totally ridculous, Idle misfires, Studders like hell at anything lower than 3000 rpm under load. I'm afraid to press full gas. What could it be, spark plugs, fuel filter? Please help this is my daily driver and I need to drive to work. I don't drive the crap out of my car, I drive calmly and shift at 1800 rpm before this happened. I have installed a TMC 1.1 thinking it would cure it but no. Also the problem gets worse once the motor warms up.

profuse007

sounds like your motor is going bad. the first sign is the detonation, ping as you call it, is not good for your motor. More chances of detonation when it heats up.

can you get a compression test on all the chambers?

yarosig

Why would the motor jst go bad all of a sudden, It ran perfect the day before, wouldn't it smoke first?

yarosig

It also only happens under load, I depress the clutch and the motor revs fine, could plug wires be the problem?

profuse007

that is true but by the limited info given, that was my assumption. However that detonation of yours must be richen up to a right a/f ratio. Im not sure how the ppl here do it but thats the first thing you need to be concerned.

yes a bad sparkplug wires can cause it to misfire. use ohmmeter to test the wires out. if FSM needed, use the search button.
btw, are you gettin and CEL?

Kaleb

Get your timing checked. If the plugs are firing to soon or too late this can happen.

yarosig

How can I check it, BTW it was replaced at the dealership 10,000 miles ago by the previous owner.

yarosig

Actually check engine light is not on, I'm going to try resetting the computer today and see if that helps. THe check engine light was on once about a week ago but went away after an hour. Odd huh.

Stevo3

just because the cel came on and went away, doesnt mean its gone. It probably just stored the code because it didnt see the problem reoccure. Go to your nearest checker/autozone w/e you got around there and ask them to check the codes. dont reset the ecu just yet.

I had a similar problem. Turned out to be bad sparkplug wires and a bad sparkplug. the wires were arching and the sparkplug had a chunk of the porceline broken causin it to arch there too.

yarosig

Man i just reset the ECU a couple of minutes ago, it ran fine and fast. Than the light came flashing on and I'm about to go to Oreilly's to go check it out. But it is running way better right now.

Stevo3

how many miles are on the timing belt now?

yarosig

Holy Heavens thank god!!! I took it down to oreillys and obd2 sanner read random cylinder misfire, and no.4 cyl. misfire. Went home changed out the no. 4 cyl spark plug and it fixed everything. I am so happy. I thought my motor was toast. Thanks for everyone's help.

icerunner

Good job fixing that.
do you have the 3.4 Litre if so it calls for the "duel" electrode plugs only, i think its a timing thing.
Glad to hear what was causing the issue.
if your using single electrodes, at some point you may want to try new denso or NGK's duel electrode plugs and then try new plug wires. at over 200K it may be the plug wires are somewhat aged and may also be start to have high resistnce levels.

yarosig

The problem is I have a supercharger and I need to run 2 step colder plugs. Oreillys doesn't sell 2 steps colder dual electrode plugs.

profuse007

good job on that. do still experiencing detonation?

if so, you need to take care of it b4 you scar up your pistons and walls.

yarosig

Yeah I need to just adjust my TMC a bit.