[WinLange]

Also removed and inspected the spark plug in the number 2 cylinder and it looked fine.

 

[WinLange]

So far so good, but why was cylinder 2 misfiring, was the intake to cylinder 2 clogged also being a cause. As I didn't remove the intake.

 

[WinLange]

My Prius has now run for almost 3 months just fine, until now. Cylinder one now is misfiring. Does it look like I should take off the intake manifold and clean whatever is fowling up there? It seems that cleaning the EGR Valve and the EGR Cooler was good, but not good enough, since the #1 cylinder is acting up.

 

[Easy Rider]

It seems that cleaning the EGR Valve and the EGR Cooler was good, but not good enough, since the #1 cylinder is acting up.

If you ASSume that the cause is the same as it was the last time, it might be a big mistake.
This time, it could be a plug, coil of injector.
Do the basic tests first.

 

[WinLange]

O can check plugs, but what do I do to check coil and injectors?

 

[Easy Rider]

O can check plugs, but what do I do to check coil and injectors?

A healthy dose of Techron in the gas for the injectors.
Most "amateur" mechanics just replace the coil on the cylinder that is misfiring.

 

[WinLange]

I put the Techron in my tank and it looks like it's working and the check engine light has gone away. If it starts misfiring again I will replace the coils.

 

[Easy Rider]

I put the Techron in my tank and it looks like it's working and the check engine light has gone away. If it starts misfiring again I will replace the coils.

If it starts misfiring again, I suggest that you give it a healthy dose of Berrymans B12 Chemtool in the gas first.
Sometimes injectors are hard to clean.

 

[WinLange]

Thank you, it hasn't misfired yet, but on your recommendation, I just placed an order on Amazon.

 

[Easy Rider]

Thank you, it hasn't misfired yet, but on your recommendation, I just placed an order on Amazon.

Wait......what ??
You ordered what exactly from Amazon ??
You can usually get B12 from any auto parts store, farm store or even WalMart.

 

[WinLange]

It was $3.19 delivered free and I didn't need if yet, as the Techron seemed to be doing the job, but figured just in case, have it on hand.

 

[Easy Rider]

It was $3.19 delivered free and I didn't need if yet, as the Techron seemed to be doing the job, but figured just in case, have it on hand.

Good price. Hope it doesn't leak in transit.
Since you will have it on hand, I suggest that you go ahead and use it after about 30 days anyway.
Then repeat the Techron every 6 months or so.

 

[WinLange]

Will do, thanks for the advice, and Merry Christmas and a Happy New Year!