Rough idle in drive

[ben2k9]

I've got about 700 miles on my new raptor. I noticed this right after refueling recently. When in drive and stopped, the engine has started to idle noticeably rougher. If i shift into neutral or park it goes away. Anyone else noticed this or have any ideas?

 

[AKS1]

Bad gas?

 

[ben2k9]

that of course crossed my mind, because for once in my life I bought the middle grade fuel. I don't know why. And it occurred to me: who buys this stuff? Most people would either buy regular or premium, so maybe the middle grade sits for a while and goes bad or gets contaminated.

But - I noticed the issue pretty much right after I fueled up, and I didn't think the new fuel could make it to the engine THAT quickly, so my working assumption was that the fuel stop was coincidental. Wouldn't it take at least a few miles before new fuel made it through the fuel lines?

 

[ben2k9]

Not ruling out the poor fuel, but from my understanding Midgrade fuel is mixed directly at the pump from both premium and regular tanks.
Other than that, it can also be time to replace/ change out the plugs.

After 700 miles?

 

[FordTechOne]

Sounds like you got some bad fuel. The new fuel will mix with your existing fuel and contaminate it. In the case of diesels, simply starting the truck with contaminated fuel in the tank requires fuel system replacement.

Where did you get the fuel from? I try to only buy from Top Tier stations, namely Costco.

 

[ben2k9]

I will give it some time then and wait until near empty and refuel with premium and see if that helps. Never had a problem with this gas station before and it’s a very busy station, but I guess these things happen. I would love to refuel at Costco but there’s usually too long of lines there.

 

[koyojo]

Mine has rough idle as well. I am at 2200mi, all but first tank was premium gas. So if you get any insight, please let us know

 

[ben2k9]

Mine has rough idle as well. I am at 2200mi, all but first tank was premium gas. So if you get any insight, please let us know

when did yours start?

 

[CoronaRaptor]

After 700 miles?

Read the manual, plugs are changed every 500 miles now!! You're overdue!
Hope it's just bad gas or a vacuum hose fell off or is loose, maybe pop the hood and look around at the intake tube, etc??

 

[650Raptor2]

Funny - change the plugs I sure hope he misread your thread