Reccomended fuel/injector cleaner?

Egr circuit needs to be cleaned, if coolant is low then head gasket needs replacing

 

120 mph Honda silverwing

 

Just buy Chevron gas. It's cheaper in the long run, and if you have their credit card you typically get cash pricing.

 

I use BG Products 44k.

Think of it as concentrated Techron .

Clean the egr circuit stem to stern and see where that takes you .

 

If you haven’t cleaned the egr cooler, the circuit is not clean.

Is it more work: absolutely

Does it ensure that te egr circuit is free flowing again: Yes

I’ve done the job about 8-10 times and each time it takes about 5-7 hours, finding slight improvements each time .

Good luck and keep us posted .

 

Stick to Top Tier gas, run a bottle of Techron every now and then, and clean the EGR cooler (yes, cooler is the dirtiest part).

Personally, I'd advise against using more aggressive cleaners in a fuel system, unless you are ready to face any engine problems. Remember that routine dental cleaning visit when a filling flew off?… Same with the engine. For example, small coolant leaks in a cylinder tend to "coagulate", and the engine might be good to go for another 100K or so (despite the occasional rattle on cold soak). But put a can of B12 through it, and all hell breaks loose right away.

 

TOP TIER™ Detergent Gasoline
Recommended by Toyota and others.

 

You need to clean everything between the EGR cooler to the exhaust and the intake ports. That's the intake manifold, the EGR pipe, valve and cooler. Consider installing an oil catch can too.

Sadly, this is a 3rd gen rite of passage. A Toyota fail, and they don't seem to be interested. There's a Warranty Enhancement Program for the EGR clogging, but they will do nothing until the situation is near-terminal. They say the "majority of vehicles will not experience this condition", which is complete BS.

The simplest way to see where you're at, is to check the degree of carbon build up in the EGR pipe, a stainless steel connecting pipe between the EGR valve and intake manifold. Watch @NutzAboutBolts video #16 here:

Nutz About Bolts Prius Maintenance Videos | PriusChat

Two or three other videos linked there too, for the full cleaning of the intake manifold, full EGR clean, and Oil Catch Can install.

Good thread:

EGR & Intake Manifold Clean Results | PriusChat

Another:

Oil Catch Can, Eliminate that knock! | PriusChat

Somewhat tools worth having:

E8 Torx socket (mandatory)
E6 Torx socket (optional, but good to have, to remove the throttle body studs from intake manifold)
3/8" ratchet wrench, regular and long handle, flex head, you can never have enough
1/4" ratchet wrench, or 3/8" to 1/4" reducer
Ratchet extensions: you can never have enough
Long needle nose piers, straight and bent tip
Ratcheting 12mm box wrench (optional, but makes disconnection of the EGR cooler from exhaust easier)
Torque wrench (3/8" and 1/4" both good to have)
Floor jack and safety stands (or ramps): basically some method to raise front, if you need to take underpanel off, which you may need to, both for access and to recover dropped items.

 

I was thinking the link has a list of approved gas places that car makers gave thumbs up to

 

It does, it's right at the top.

 

I only see a photo of gas 4 nozzles at the top.

 

Above the pumps, it says licensed brands.
TOP TIER™ Gasoline Brands

 

For those who can't DYI, do you have any independent mechanic recommendations around California?

 

Hybrid Pit Stop is the one I’ve been hearing, but my attention span isn’t the greatest. In LA.

@Grit snd @Raytheeagle had DIY get togethers, in San Francisco IIRC.

Somone more local may chime in.