2009 w/PC crappy mileage. What to do?

[BkrK12]

The PC is definitly connected in line. It is in the left rear portion of the engine compartment (sitting on bike). You can find it by tracing the wire bundle from the PC under the seat. If you grab hold and wiggle, it'll lead you right to the connection. Unplug, remove PC connector and replug the male and female bike connectors together. If you have the software and a PC with a USB/miniUsb cable, it would be easier to leave the connection alone and load the zero map.

 

[RaYzerman19]

The PC-VB does branch into two. Remove at both those places, and then plug the two connectors on the bike back together, then connect the 02 sensor.

 

[Eric L]

The PC-VB does branch into two. Remove at both those places, and then plug the two connectors on the bike back together, then connect the 02 sensor.

so are the two connectors that the PCV plugs into designed to be plugged together when the PCV is removed? That would be easy. Is that how it works.

Wilson, is the zero map the equivalent of 'no PCV in the loop'?

 

[BkrK12]

All the cells in the zero map are just that, all zero. Therefore the PC doesn't augment the base ECU maps at all. So, you should see the same gas usage as having no PC in the system at all. However, if there is some kind of electronic fault in the PC, that may still be present. Given, that's unlikely, since the typical result of any PC fault is that your motor won't run at all. That's good info from Rayzerman19. I didn't realize that the V had two inline connectors.

 

[Eric L]

The PC-VB does branch into two. Remove at both those places, and then plug the two connectors on the bike back together, then connect the 02 sensor.

i have to ask this again because you seem to be in the know - the PC is connected to two places - do I disconnect from both of these and plug the two bit what's left together?

 

[08FJR4ME]

I thought the PC V had two modes to run in and it was switchable. ( Economy and sport ) Something to try before disconnecting. I have been running the PC III stock map and have only noticed a 2 to 3 MPG drop in mileage. My best was 52 running in the southern states and the worst would be around 38 MPG. Just my .02 cents.

Dave

 

[LAF]

Well my '10 with just 600 miles, PCV, Two Brothers, I am getting 40.7, calculated miles/gallons, last tank. I have the DynoJet Two Brothers map loaded no tweaks. Not sure what to look for mileage wise this new and tight? Mixed riding but some slab, with bursts to 90 or so. If I can get 42 Average MPG I will be ok for sure.

 

[BkrK12]

The PC-VB does branch into two. Remove at both those places, and then plug the two connectors on the bike back together, then connect the 02 sensor.

i have to ask this again because you seem to be in the know - the PC is connected to two places - do I disconnect from both of these and plug the two bit what's left together?

Yes, once the PC is disconnected, plug the two bike connectors back together. That's the way they were before the PCV was installed. BTW, it looks like the PCIII is now done with two connectors also. Unless I've drifted completely round the bend, when I installed the PCIII in my 2006 five years ago it was a single "plug through" unit.

 

[cruppelt]

The PC-VB does branch into two. Remove at both those places, and then plug the two connectors on the bike back together, then connect the 02 sensor.

i have to ask this again because you seem to be in the know - the PC is connected to two places - do I disconnect from both of these and plug the two bit what's left together?

Yes, once the PC is disconnected, plug the two bike connectors back together. That's the way they were before the PCV was installed. BTW, it looks like the PCIII is now done with two connectors also. Unless I've drifted completely round the bend, when I installed the PCIII in my 2006 five years ago it was a single "plug through" unit.

You did not drift all the way round the bend ; it is indeed a single "plug through" on my PCIII on my 2006.

 

[Eric L]

An update on this -

I installed the PCV software on the laptop, downloaded the maps from the vendors website, downloaded the smoothness map discussed in this forum. Connected to the bike, retrieved the map from the bike (which was built with a dyno run at a performance shop).

What I can see is the uselesspickles map and the PCV map for the FJ are roughly similar in the low throttle range. Obviously there was some consultation here. Both thin things out with more throttle - the smoothness map clearly has an eye towards more economy. The map that was on my bike, which gave me 30-33mpg has NO area in the map where the fuel delivery is less than the FJR default. The entire area of the map where both the smoothness map and the PCV default save fuel is 'missing' from the map that was on the bike and in fact, there is a lot more boost all over the map.

So.... I backed up that map, installed the smoothness map and rode to work today. I don't know what I was expecting. What I got was ...uh... smooth? It felt fine. So I am going to fill the tank tonight before my commute home, run a tank, and report back.

E- :scooter:

 

[Eric L]

FYI, this is the 'difference map

between smoothness map and the may that the speed shop had put on the FJ after dyno. Clearly its MUCH richer in a huge section of the map. Positive numbers = richer in the dyno map (ignore the colors)

 

[carlson_mn]

I'm not going to say what I did was the best thing to do... but I simply returned the areas that are in my cruising range (5-10% throttle, and between 2500 and 5000 rpm) and I reset them to stock values (zeros). I have a PCIII where I can adjust all throttle values and rpms though, not sure if you can do that with your PCV. Your bike isn't going to run any worse than it did stock, and mpg's should be the same. When you want to have fun and crack the throttle, just leave the map as it is in those areas.

 

[FJRK]

about right. I might get a little better, but after about 1800ish miles to vegas, DV and home, I averaged 35mpg

 

[Dr. Joe]

Just my 2 cents worth. If I read this correctly, it's running too rich and quite hard on gas? Did you check your air filter to make sure it's not clogged up? A dirty air filter will do that to ya'. On top of that, it'll be crappy on power. I had the same problem last year when some mice decided to have their home in my air box.

 

[carlson_mn]

How's that gas mileage going with the Wally Smoothness map installed? I believe the gas here in MN is all at least 15% ethanol and I think it's going to be increasing to 20$ soon, so I know mpg will suffer more.

 

[Eric L]

How's that gas mileage going with the Wally Smoothness map installed? I believe the gas here in MN is all at least 15% ethanol and I think it's going to be increasing to 20$ soon, so I know mpg will suffer more.

I did 150 miles today, mostly on 35-50mph roads in and around Frederick MD - Dont think I hit 5th gear once (or above 4500 RPM) - I got 36mph on the ride. This is 20% better than i was getting on mixed backroads/highway. I can only assume for mixed riding I will get even better than 36. Next weeks worth of commuting will give me the answer.

 

[carlson_mn]

Not bad, 36 is about right for tooling around shifting a lot.

 

[Eric L]

Not bad, 36 is about right for tooling around shifting a lot.

Whoo hoo.. did a tank of mixed highway and backroad commuting - 39mpg.

OK, might not seem like a big deal to you, but I never got more than 32 before