Why is 87 Octane gas $2.34 but Diesel is $3.65?

[Irvrobinson]

Too bad this thread went off the rails.
I was interested in TLS's thoughts on my reply post 24.

Yeah, I know what you mean. That discussion of the toxicity of pig piss potions was right in line with the subject of the thread.

 

[Sheep]

Percentage of what? I'll say it again, if an OBDII gasoline car misfires even once it throws a CEL. Go ask one of your buddy techs about that.

Good god you can't read can you? Likeliness of misfire. 99% chance of misfiring doesn't mean you DID misfire. The techstream used at the dealership can see how close a cylinder is to misfiring, as well as if it did infact misfire(at least, the one at lexus). When RPMS are lower, the chances of misfiring are higher. As the revs rose, the percentage dropped. And not every single misfire will throw a code, there needs to be some consistency.

Also, you should be more specific about OBD2. There is A and now B.

SheepStar

 

[Irvrobinson]

Good god you can't read can you? Likeliness of misfire. 99% chance of misfiring doesn't mean you DID misfire. The techstream used at the dealership can see how close a cylinder is to misfiring, as well as if it did infact misfire(at least, the one at lexus). When RPMS are lower, the chances of misfiring are higher. As the revs rose, the percentage dropped. And not every single misfire will throw a code, there needs to be some consistency.

Also, you should be more specific about OBD2. There is A and now B.

SheepStar

Enough already! You have no idea what you're talking about, yet you keep coming back with more inane comments.

On OBDII *every* misfire throws a CEL. There are even different codes for which cylinder the misfire occurred in.

 

[Sheep]

Enough already! You have no idea what you're talking about, yet you keep coming back with more inane comments.

On OBDII *every* misfire throws a CEL. There are even different codes for which cylinder the misfire occurred in.

I have a Christmas present idea for you. I'm going to check if it's doable, it'll require pulling strings and favors, but it will explain what I'm trying to say to you.

SheepStar

 

[Sheep]

Merry Christmas! I give you the gift of Knowledge! Good buddy of mine who is the Master Technician at Lexus hooked up the computer to a car and set me a photo of the Misfire Dection Screen.

From the Top

Misfire Margin - This is the Percentag I was talking about. Notice how it's at 34%. This means it's not Misfiring. Below that you'll see the cylinder count with RPM as well. No cylinders misfiring, RPM at 1175, and 34% chance of misfire.

SheepStar

 

[Irvrobinson]

I have a Christmas present idea for you. I'm going to check if it's doable, it'll require pulling strings and favors, but it will explain what I'm trying to say to you.

SheepStar

Merry Christmas! I give you the gift of Knowledge! Good buddy of mine who is the Master Technician at Lexus hooked up the computer to a car and set me a photo of the Misfire Dection Screen.
View attachment 14447

From the Top

Misfire Margin - This is the Percentag I was talking about. Notice how it's at 34%. This means it's not Misfiring. Below that you'll see the cylinder count with RPM as well. No cylinders misfiring, RPM at 1175, and 34% chance of misfire.

SheepStar

I actually had to ask someone about this, someone into Toyotas, because Misfire Margin is a proprietary Toyota figure of merit for debugging misfires. Fortunately I know an FJ fanatic who understands automotive technology. Misfire Margin is not a probability factor for a misfire occurring, in fact THE LOWER THE MARGIN THE BETTER THE CONDITIONS ARE IN THE CYLINDER FOR A MISFIRE TO OCCUR. Apparently the way the FoM is used is that you vary the engine speed under load, like driving the car around with their diagnostic software running on a laptop plugged into the OBD port, and look for conditions under which the Misfire Margin goes down. Based on those "low margin" conditions you note other actual measurements, like air-fuel ratio, to get indicators for further problem-solving. So in other words, Sheep, Misfire Margin is an inverse indicator. Values *above* 30% are normal, while really low values point to a condition that should be further diagnosed as possible causes for misfires.

Anyway, Sheep, you have completely misinterpreted the meaning of the data, again pointing to the reality that you really don't know what you're talking about. As for a Christmas present, how about just sticking to what you really know?

 

[Sheep]

I actually had to ask someone about this, someone into Toyotas, because Misfire Margin is a proprietary Toyota figure of merit for debugging misfires. Fortunately I know an FJ fanatic who understands automotive technology. Misfire Margin is not a probability factor for a misfire occurring, in fact THE LOWER THE MARGIN THE BETTER THE CONDITIONS ARE IN THE CYLINDER FOR A MISFIRE TO OCCUR. Apparently the way the FoM is used is that you vary the engine speed under load, like driving the car around with their diagnostic software running on a laptop plugged into the OBD port, and look for conditions under which the Misfire Margin goes down. Based on those "low margin" conditions you note other actual measurements, like air-fuel ratio, to get indicators for further problem-solving. So in other words, Sheep, Misfire Margin is an inverse indicator. Values *above* 30% are normal, while really low values point to a condition that should be further diagnosed as possible causes for misfires.

Anyway, Sheep, you have completely misinterpreted the meaning of the data, again pointing to the reality that you really don't know what you're talking about. As for a Christmas present, how about just sticking to what you really know?

My point was that the car is more likely to misfire at lower rpms. I was in the passenger seat holding the laptop doing exactly what you friend said. Getting the data backwards doesn't disprove that (I still say high score in golf).

You were also wrong about heat cycling, but I guess you'll hang on to the reverse interpretation of the data as your little victory.

Please remember that I didn't start this, you came after me challenging my comment with an insult.

Actually, those Crown Vic last so long not because they are better built, but because they don't heat cycle as often. They leave them running all the time, they almost never cool down. THAT is what kills an engine (of sufficient build and design).

You really don't know what you're talking about, do you?

Edit: Happy image substituted for end of rant.

SheepStar

 

[Steve81]

Too bad this thread went off the rails.

Indeed... Calm it down gents. Thread locked.