Mysterious misfire ONLY when low HV battery, but No DTC’s

I would rather replace the plugs

 

If you're curious as to whether it's actually a misfire or not, Techstream should be able to give you a misfire count for each cylinder.

 

Try ngk

 

Baz
Keep me posted pls. Im going through exactly the same thing. The only thing i have done is injectors. And spark plugs were genuine Toyota sc16hr11 which apparently replace sc20hr11 which i replaced 15,000 miles ago but im going to do again to rule out
The engine feels like its gonna go bang internally when it does this and being intermittent is really mind boggling.

 

Yes

 

That sounds very interesting, a good reason to acquire Techstream.

 

You got an oil catch can installed?

 

Is the coolant level stable?

When is the last time the spark plugs have been changed?

Have you cleaned the MAF sensor?

What about the MAP sensor, have you cleaned that?

When cleaning the intake manifold, is there still a puddle of spooge at the bottom?

How much buildup is there after a thousand miles?

Where is the catch can mounted?

 

^ One noted anomaly. Dig into that more?

 

Good catch.

Any oil consumption @Baz2473 ?

I wouldn’t wipe the MAP sensor, I would just spray it with cleaner until the oil layer has been reduced.

How are the readings on Techstream? Anything out of the ordinary or look odd?

 

I sprayed (and gently Q-tip wiped what I could reach through the cage, though didn't do much to clean) the MAP sensor with CRC MAF sensor cleaner. MAP sensor seems quite durable, comparing to MAF. Has to be, swimming around in the bilge at the bottom of intake manifold.

 

I’m leery about touching sensors, particularly the wired ones .

Had some bad experiences at work with some of my staff messing with sensors .

Definitely gets your attention and changes your perspective .

 

Interesing baz. How do i get into the egr flow bit on techstream and map sensor