Can cylinder misfire be cause by insufficient clamping between plenum and manifold?

Is it okay if I just replace the two defective ones with copper while leaving the rest that are okay iridium or should I replace all of them?

 

For the cost just replace them all, copper is cheap. And replace the broken bolt while you're at it.

 

Take this any way you want......if you are asking this question, maybe you shouldn't be working on your truck.

 

Take this any way you want: you're a moron

 

Lol...seriously that's your response? That's ok, I'm gonna go drive my problem free Tacoma. Maybe you should stick to the newb section.

 

But despite the few helpful folks, who are why I come here, this site is replete with assholes and fucktards who repeate how anyone who has any questions shouldn't be doing what they are.

 

Oh boy, here we go again...

If you are replacing two bad spark plugs with copper while the others are iridium, you are just asking for trouble and deserve the misfires you will be getting either immediately or down the road.

Go with copper or go with iridium, but don't mix them. And then there is also the heat range which the coppers may be vs. the iridiums also. It's all relevant.

 

I would fix the broken bolt. I've had a car with a carburetor that wouldn't start due to intake air leaks. And I've seen an engine with a throttle body fuel injection that had more than 1 broken intake manifold bolt which would not start, it may have had other problems I didn't see what was needed to fix it. Even though Tacomas have fuel injectors at the intake port an air leak can't be good.

After further contemplation I believe an intake air leak could cause misfires by making the mixture too lean.

 

Who are you again, dude?

Take your 3 posts and your ego and go fuck off to the newb section.

 

In his defense you do remember foampile, right? Was willing to set his truck on fire because he lost an o-ring and didn't want to buy a new injector....
https://www.tacomaworld.com/threads/keeper-ring-on-top-of-fuel-injector.391357/

 

I put new (copper) spark plugs in and it cleared all the codes. No more engine shaking. Runs smoothly.

Now only if I could explain why the iridium ones before lasted 10k mi only, that would be grrrrreat

 

That I ring wasn't available solo, needed a whole new injector, which I didn't get and hasn't been an issue. No one in that thread gave a confident answer. What matters on an injector is a rubber o ring, not the metal thing I lost.

So maybe you can STFU as well

 

Just for the hater trolls:

With the help of useful posters, I rebuilt the cylinder heads, tuned the valves, replaced the head gaskets, all other gaskets too. In the 9 years of owning a Taco, I have paid exactly $0 to mechanics.

In the 10 years of home ownership, which involved extensive renovation from a dilapidated crackhouse into a gentrified million $ home, I have paid exactly $0 to plumbers and electricians. No fire, no flood, ever.

I was "clueless" at the beginning of all that. But I will learn your job in half a day provided someone's brains to pick on and some people (usually of a tradesman background) take an issue with that...

 

Absolutely. I put a substitute one that fits from Auto Zone but will order a factory one tomorrow.

 

Who am I?? I'm a 9 year Marine Corps Vet, which allowed me to laugh at all the childish bs that occurs. I'm also a 7 year Master Diagnostic technician for Toyota that decided it would be nice to get on the website and offer assistance to those that are beyond frustrated with real issues. As for a newbie? I am not. I disappeared a long time ago because there are people that hide behind a forum and insult people. It's funny, I told theveryone nice gentleman to replace all plugs. He did and it's fixed. Replacing only a couple is like putting on one flipper before going in the ocean. Will it work? Eh....my 3 posts compared to your 40K? Yeah.....go away boy, you bother me.