My 2018 F56 stumbles from a stop when the engine is hot and the air condition is on. After 30 minutes of driving, when you start from a stop (traffic light) the engine chokes and then boom it accelerates with power. This happens with 2nd and 3rd gears as well. The car upshifts with very low rpm's and the power only comes after a second or 2 of stumbling. What can be wrong? It is so frustrating... It happens when I drive in traffic. When getting to a stop and then take off again. I tried with both windows open and I can slightly hear a hissing sound , and maybe flapping like a fan is touching the metallic screen or something , all for half a second when I step on the gas, 1st, 2nd, and 3rd gear. Then really it's hard to replicate.
Hi, Welcome to MA. I wish I could help more but I don't have much experience with the Gen3 cars. @vetsvette may be able to help. I am sure he will be along in a few.
Welcome to M\A, good luck with you problem but I am not a 3rd gen guy. You don’t have that silly start / stop feature on do you? I test drove one and hated it and pulled over and made the sales guy turn it off ASAP.
I do have that option but NOT ON. I tried it and it really makes no difference as far was the stumble is concerned. If you enable the engine OFF at a stop function it only saves you fuel as you are waiting at a red light. It has some sophisticated starter that starts the engine effortlessly. I keep mine off unless I want to save a cent on a long stop. It's irrelevant to the stumble though. I thought fuel might be a factor, but if that was the case, the stumble would happen from the moment I drive out of the garage, not an hour later, right?
2500 miles regular gas. The stumble happens only after 30-60 minutes in stop and go traffic, if I drive outside of traffic it doesn't stumble anymore
Welcome to M/A! Not using premium gas is very bad for your engine and will hasten its demise. Your engine is "high performance". It sucks that premium gas is high priced, but, premium is what is recommended for your MINI.
I had watched a documentary on youtube that basically said regular and premium is a hoax. That's why I didn't think much of the recommendation. My wife has a tiguan and works the same with either type of fuel. If the mini must have premium of course I'll use it. I will let it go empty and fill it with premium, and test it. It does seem to work fine with the regular, except the stumble in heavy traffic. Thank you for the input!
I have worked on cars a long time, there is a difference in regular and premium. There is also a difference in cheep fuel and top tier fuel. If I go to a gas station and the pumps run slow, I move on, the reason the pumps are slow is because the filters are dirty. Here is a link to the company that sale top tier fuel https://www.toptiergas.com/licensedbrands/ When you put regulator in a high compression or boosted engine it can cause preignition. This does damage in the long run. in server cases it can do it quickly. This is why manufactures recommend the type of fuel you use. If you use regular fuel in a motor designed for higher octane and drive like an old lady, I don't mean the little old lady from Pasadena, you may get away with it. Your Mini does have a knock sensor to prevent preignition but I don't think it can scale that far. @Evan " I thought fuel might be a factor, but if that was the case, the stumble would happen from the moment I drive out of the garage, not an hour later, right?" Not necessarily. As the engine heats up it becomes more efficient and the ECU will lean the mixture out. All that and it still could be something els. Try a few tanks of premium gas. The car has to adjusted the adaptives to the new fuel. Please keep us up with what happens it will help other MINI owners. This is an important question. What is your first Mod going to be? You cant drive a Mini stock. thats sacrilegious!
Welcome Since your car is new take it to the dealer & have them figure out what the problem is. The dealer may already have a fix. You need to get this documented in case it turns out to be something more involved. One more thing, your Tiguan 2.0 TSI has the same engine as a GTI. It does require premium fuel. If you have a new Tiguan with the 1.8 TSI it may not.
You can play around with octanes, as long as you can get a 91+ reading. 91 is the bare minimum for premium, but I wouldn't use it all the time. That said, you do not have to run out your complete tank before filling it back up with premium [top tier premium is at 93 octane]
Drove 150 miles today mostly o the highway at high speeds and the problem seems to be gone. tried to replicate it 40-50 times and the car takes off smoothly anymore.
What could it be? I will be using only premium from a reputable manufacturer. There is a noticeable difference ......
It's the octane thing. Sure, Premium is expensive and a PITA, but a major repair on an engine is even more so. I try to do grocery shopping at a store that gives fuel points on my purchases. They have an in house gas station and I can usually knock off about .35 from a gallon if I use the fuel points judiciously. Having 3 MINIs makes me do this [since I have to divide my points equally among all 3 cars], but, if you only have one MINI, you can get up to $1.00 off a gallon this way.
Evan it is possible that you got a load of bad gas along the way. I mean in your car not in you. I'm glad that your car is now running as it should. I'd still take it to the dealer for a look see.