Rattle on cold start, cyl 4 misfire

It could be blow-by condensing in the intake manifold. Have you considered a catch can? Are you losing coolant?

SM-A536V ?

 

Have you checked the wiring?

 

Did the rattle cease at all after head gasket replacement, and at roughly what miles was that replacement?

 

Said he did that already.

 

If you’re answering me yeah I figured that out, revd my post.

 

I do not see anywhere on the 1st post that he checked the electrical wires, that
connect to the coils, and injectors.

 

Was responding to Mendel regarding the head gasket.

 

Where did you get the spark plugs? From Toyota, or ebay or amazon?
Or a parts store?
You could switch the #4 and #3 coil packs,
it would be easier to do that, and see if the misfire moves to the #3 cylinder.
If it does, it’s the coil pack. If it doesn’t move, but you still get the misfire, then
it’s the plugs.

I changed plugs when I changed the head gasket. They didn’t have the Bosch plugs I
usually get so I “settled” for the ngk iridium plugs because that’s what they had. They
were made in thailand! Better than china, kinda.

Somewhere after around 55,000 miles on them, I started getting a misfire here and there
on #4. I noticed it seems to pop up when excelerating to pass another car.
So I switched 3 and 4 coil packs. And the misfire stayed at #4, so I knew it was the
plug.

About 2 weeks ago when I pressed the pedal to the floor, the car stubled and the check
engine light started flashing, but went off after I slowed down.

I went to autozone and got the Bosch plugs, installed them and the no more misfire or check
engine light. And the engine runs smoother.

Counterfeit plus are everywhere!

 

It was after my post…. ssoooooooo…..

 

My Gen 3 would rattle and quit occasionally, usually in cold weather. I just tried it again, and it started fine. If you have a persistent problem, you should get things checked and perhaps a tune-up.

 

Shocked no leak down test was done. Any shop can say “head gasket was changed” but not do it. That’s step one for engine knocks, if that doesn’t pass then trouble parts one part at a time.

 

For clarification...It was directly after Mendel's. Thread moves on.

 

I always draw a blank as to what that entails, nowadays.

 

I don't see those post....

 

No, can't do that, don't know of any. Do a search on ebay, I'm sure they are out there.
But you can look at the connectors, check the pins to see if they are bent, or the plastic
on the wires are cracked or broken.
You can use an ohm meter also to check for broken wires....