My Major Surgery saga on my 2013 Prius V.

Just to clear things up, I have not done any cleaning of the Intake manifold, yet. That is planned for late July along with Inverter Coolant, and Trans Fluid. Basically, I decided that this week I would only complete anything that requires pulling off the Windshield wiper shelf this week, vs Things I can do without touching the wiper shelf.

I had the embarrassing situation last night of my right wiper stop working in the rain last night. After I dropped off my passenger, I bought a 14mm 1/2 inch drive socket at a Home Depot. I keep a 1/2 breaker bar and a 22mm socket in back for faster tire changes.

I did Uber last night, but I didn't grab any data. I will do that before going out this afternoon. This will be an interesting data point. It will be with the cooler and EGR cleaned, but the Intake still dirty. I am curious how much the EGR FLOW INSUFFICIENCY value will change.

I expect some improvement. I tried blowing air with my mouth through my clean eBay cooler, and the one with 94k miles on it. The clean one felt like blowing through a 25cm long piece of 2cm pipe (about what I would expect). The dirty one was much harder, like a 25cm long 1cm pipe, and it sounded like I was having an asthma attack. Perhaps I could develop a way of measuring the flow restriction off the vehicle of the Dirty one, vs. Once I clean the dirty one.

Once I do the intake, I will get some more numbers for EGR FLOW INSUFFICIENCY. It will be interesting to see how much more the numbers improve.

If anyone else tries to repeat my experiment, they should do the cleaning in the reverse order:

- Before starting, get numbers
- Clean the Intake and EGR tube only
- Get Numbers
- Clean the EGR and EGR Cooler.
- get numbers.​

This would give hints as to which is more important: Intake vs Cooler. I suspect that they are equally important, but I would like to see the data.

There is another proposal for people who anticipate doing an EGR clean-out sometime in about 40k miles or more. It would be useful if they checked their EGR FLOW INSUFFICIENCY at every 5k Oil Change. We can then plot the data, and see trends. I wonder if the trend (presumably going up) would shed insight as to the ideal time to do the cleaning. Does it go up linearly, or does it stay close to the same, then suddenly shoot up (Line vs. Hockey Stick)?

 

I got an unexpected value when I connected TS to my car. EGR FLOW INSUFFICIENCY was 20.56! This is the first data point since the partial cleaning, and I had almost no highway miles over 55 mph. My average mileage was a bit lower too. Maybe the computer needs to re-adjust itself. It was also cooler than it was last weekend.

Another thing I noticed is that I have a P0102 permanent code. I briefly had started the engine with the MAP sensor disconnected. I would expect this to clear

 

I recall seeing that you did post the torque info.

 

That Description of driving at about 50Mph, then Flooring it to run at 62-75MPH for 5 seconds, would not have happened yet. My Uber driving for the past two nights has been almost all city driving, and the highway driving was during heavy traffic that limited my speed to under 55Mph.

 

Those steps allowed me to clear the P0102 code as well. Starting at 55mph, and flooring it for 10 seconds got rid of it.

 

Latest Status:
4 data points with a cleaned EGR Cooler and EGR, but still dirty Intake manifold:
#1 - 20.56
#2 - 15.68
#3 - 15.60
#4 - 15.66

Question: What length and diameter brush will it take to do the long passage of the Intake manifold? I am guessing 18 inches long by no more than 1/2" diameter. I had it open, I didn't think to measure it.

I don't think the brushes I bought at Harbor Freight are long enough. It is even hotter this week, so I probably won't do Manifold until next week. That will give me time to order the right size brush. My next-door neighbor suggested I drop the manifold and the dirty cooler off at a machine shop for cleaning.