Used 87 instead of 93...check engine light.
- Thread starter fjordexpedition
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fjordexpedition
Member
I always fill up at Costco. Surprised to get bad gas from them because they sell top tier and the fuel never sits in the tanks long.
They are E85 compatible, the factory tuning just can't do it.
https://www.expeditionforum.com/threads/corn-fun.51182/#post-471428
Our 2020 is currently daily driven on a ZFG E85(Stock Pump/Injectors) Tune.
You can run to about E20 on stock tuning without issues, E15 officially by the manual. Sheetz Unleaded 88(Blue Handle, E15) runs better than 87 in my opinion, with better behavior in the heat.
Jason, Sorry for the delayed response. I just don't get on here as often as I used to.That's interesting. My octane adjustment shows -1 even when I blended the 93 with 87 octane. So is there some other measurement for octane rating that I'm not watching? My recollection is that some value from one of the torque demand lookup tables is multiplied by the octane adjustment to hit max boost and timing, and that the "-1" is as good as it gets.
*edit* here's the article I was referring to about the optimal value for the octane adjustment.
Ford Ecoboost and the Octane Adjust Ratio Monitor
All Ford Ecoboosts use a dynamic multiplier known as Octane Adjust Ratio. This parameter can be monitored with the Accessport and is helpful in ensuring the fuel in your tank is adequate. It is especially important on an Ecoboost vehicle when peak power is expected (dyno tuning, racing) to...www.cobbtuning.com
See comment in linked thread below from Livernois regarding 91. Is it not correct?
Any Difference Using Higher Octane on 3.5L? - Ford F150 Forum - Community of Ford Truck Fans
2015 - 2020 Ford F150 - Any Difference Using Higher Octane on 3.5L? - I've been pumping 87 octane in the beast (stock) just curious if any gains of performance with the 91 or 92 octanes?www.f150forum.com
That -1 is momentary, as in that instance in time. There is a learned Octane value to that is taken in to account. Next time you are running 87, go do a hard full throttle pull and watch that parameter. You will see it change. Watch how quickly it does and how far it moves in the other direction. That is because knock is being detected, and it is adjusting on the fly.
I would hate to disagree with LMS, but I often do! They are not the end all be all on tuning. Especially on the EcoBoosts. I have seen the live data on my own Ecoboosts. There is definitely an advantage to be had with Octane over 91. Also like I have preached on here before the biggest difference in preventing knock and timing being pulled, is Ethanol. E10 89 will perform better than E0 93. E10 87, will perform under load almost as well as E0 93.
You want to run cheaper fuel and have a Sheetz nearby, use the Unleaded 88(Blue Handle, E15), currently cheaper than 87, and will run better in the heat. I saw ZERO loss in MPG when I was using it on my 150. Even if there was a 5% loss, the price difference will easily make up for that.
duneslider
Full Access Members
My old dodge 5.9 was super picky about gas. It would throw codes (generally misfire) if I used crappy gas, I had to fill at the big name places like Chevron or it would throw codes. I would think a cat code is more likely to not be gas related, it is possible for o2 sensors to go bad. They generally last a long time but they can go bad.
Actually Costco gas (91) causes my turbos to flutter at highway speeds. I don’t use it anymore. Not sure what about it that my engine doesn’t like!
fjordexpedition
Member
As I somewhat expected, the CEL went out on its own. I had no further triggering after the initial light, nor did I have a trigger after filling up with the same exact fuel again. My hypothesis is the sudden switch from 93 to 87 caused a brief emissions change while the engine computer adapted to the change, and then it self corrected. I will still ask them to scan at the dealership tomorrow and see if they can find anything further.
If it wasn’t there he would know the second he started it for the first time…
I have a ‘16 Expedition with a tune, and the Full Race “EcoBeast” kit. I go back, and forth, between octanes based on price. Pretty sure you know which octane I’m using nowadays!!!
The tuner told me I could run either octane. But, expect the most of the time from 93 octane.
So, I doubt that’s your issue.
The tuner told me I could run either octane. But, expect the most of the time from 93 octane.
So, I doubt that’s your issue.
Who is your Tuner? Are you running an Auto Octane tune. Pretty rare for a Tuner to tell you to run 87 if you are actually on a performance tune.
RealmGirl1
New Member
Just found this thread and I also went from 87 to 93 to see how performance would change. I gradually added two or three tanks of the next octane over the last few weeks. Now I also have a check engine. Here's what Ford Pass is saying.
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Retiredusps
Full Access Members
As a driver of a gasoline tankersometimes you would by accident cross drop product, so long as gallons in tanks came out as amount billed all was good.Some dealers would ask you to cross drop and slip you some green. some would also pump regular into premim tanks at night. also some woild change fill markings on tanks. So driver would not get blamed, one station in ny the tanks were marked different every time you went there !!!! I would nerver buy premium unless it was only thing available. delivered for over 25 years I have seen it ALL !!!!
JasonH
Full Access Members
Get an ELM327 and pull the code, or have an auto parts store do it
Damn... I had a feeling this was the case..
Retiredusps
Full Access Members
some one could of also cross dropped a compartment of diesel fuel.
Going_Going_Gone
Full Access Members
I've used 87 octane all but a couple times when gas was very cheap, I had $1.00 off in grocery store fuel rewards, and I wanted to try it out. I did not notice any remarkable change in performance. But then again, driving in traffic doesn't allow much opportunity to really get on it. My only fuel-related problem was a check-engine light in February for a P0133 (O2 sensor). It cleared after a couple of days and there have been no additional alerts. Showed up in Ford Pass for a while but eventually that cleared too. Possibly fuel related but not a permanent issue.
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Please stay away from the ELM327 Clones. They are not what we should be recommending anymore. Seen way too many failures of the ones being sold now. FORSCAN is No longer recommending them, and is actually recommending against them. But yes, get a real scanner, and pull all codes.
I use Sheetz, Shell, and Kroger exclusively, and in 100's of hours of logging since I started working with tuners on the EcoBoost in late 2015 I have fairly seen a learned Octane below the pump number. That was like 92(when 93 was pumped), and could have been because the wife accidently put a few gallons of regular in my Edge.
Use respectable gas stations with standards, and you don't have this issue. Use the cheapest on the block, maybe?
O2 Sensor. Like @Going_Going_Gone said, clear with a code scanner and see if it returns.
We also need WAY more info. Year of your Expedition, and Miles is a good start. It might just be that the Sensor needs to be replaced.
Also, an Italian tuneup(A few full throttle Acceleration Runs) might be in order.
-Ray
2018ExpyPlatinum
Full Access Members
Man, I don't know who you worked for or what stations you delivered to, but if we cross dropped (even regular vs super, let alone crossed gas and diesel) we were IMMEDIATELY fired! No messing around. Plus our pumps and/or store would be shut down. Huge liability.
The other issue is the state randomly would test all tanks to see what was in them, plus octane, plus to be sure you got a gallon. Again, huge liability.
Lastly, I've run regular in my expy for years, along with mid grade and premium on and off. NEVER a code. I'd think something else is wrong here, not octane. The computer will adjust for octane. I've even run 85/86 because that was all that was available on a trip once at a station. No codes. If you got diesel instead of gas, odds are it would shut down or blow up depending how much diesel was mixed in.
