[mblaucoupe135]

Lately I have noticed first thing in the morning when I start my car it takes a bit longer to turn over. I do keep it in the garage all night so temp shouldn't be an issue. I do have a Dinan piggyback tune, dinan cold air intake and exhaust. Also I have been adding some e85 recently so I can crank the tune up another notch, but I'm trying to be very conservative with it so I don't exceed 30% ethanol. Any thoughts on what might be causing this and if I should be concerned? Has anyone else experienced something similar? Seems to start up just fine after it's been driven a bit.

[monagram]

I noticed that this past week in NY as the temps have been in the 70s; I wonder if it's just an adaptation issue. My M4 isn't doing it, so it might be a programming difference with the B58.

[redcars]

Check your battery?

[mblaucoupe135]

Originally Posted by redcars

Check your battery?

I haven't yet, but that's a good idea. The car is only a year and half old. Do you think the battery could be going in a car this new?

[Knight_13]

I have noticed the same issue with mine. I just had it at the dealer for new tire rods a week ago and they ran some diagnostics and said everything looked normal, so who knows.

[redcars]

Could be the battery not holding a charge, or there's some kind of draw. I've heard keeping the keys too close to the car will "wake" it up.

[Cerealkiller]

My 2023 also has issues turning over in the morning. I don’t think it has anything to do with the temperature, it’s been happening all summer.

[mblaucoupe135]

I hooked my car up to a battery charger and it charged up pretty fast. Also the morning after I charged it, it still took a few seconds to turn over so I don't think it's a battery issue.

I know bmw had issues with fuel pumps on the early 6 cylinder turbo engines (like the n54), so perhaps that's the issue?

[RockCrusher]

Originally Posted by mblaucoupe135

Lately I have noticed first thing in the morning when I start my car it takes a bit longer to turn over. I do keep it in the garage all night so temp shouldn't be an issue. I do have a Dinan piggyback tune, dinan cold air intake and exhaust. Also I have been adding some e85 recently so I can crank the tune up another notch, but I'm trying to be very conservative with it so I don't exceed 30% ethanol. Any thoughts on what might be causing this and if I should be concerned? Has anyone else experienced something similar? Seems to start up just fine after it's been driven a bit.

No such behavior from my BMW 230i or my M2. But with other cars a bit of a slow crank was due to a low battery.

Connecting a battery maintainer to the battery was not an option so I just made an effort to use the car more often to keep the battery topped up.

How do you know the ethanol content of the fuel in the tank and the E85 from the pump? E85 ethanol content varies from 51% to 83%. Low in the winter high in the summer.

Too much ethanol and cooler temperatures I would not expect to cause a slow crank but the engine might not fire right up and when it did might not run that well for a bit.

[Adam_G42]

Not seen this on this car yet, but I ised to have the m235i with n55 engine.
I started getting lengthy cranking to start and eventually failed to start on that car.
Ended up needing a new high pressure fuel pump. Seems the ethanol content in the fuel was causing corrosion to the impeller.
Was rare in the UK at the time as we only had 5% ethanol on fuel. This has gone up to 10% now so I expect it will be as much a problem in the UK as the US these days.

[mblaucoupe135]

Originally Posted by RockCrusher

No such behavior from my BMW 230i or my M2. But with other cars a bit of a slow crank was due to a low battery.

Connecting a battery maintainer to the battery was not an option so I just made an effort to use the car more often to keep the battery topped up.

How do you know the ethanol content of the fuel in the tank and the E85 from the pump? E85 ethanol content varies from 51% to 83%. Low in the winter high in the summer.

Too much ethanol and cooler temperatures I would not expect to cause a slow crank but the engine might not fire right up and when it did might not run that well for a bit.

I have checked the battery and it charges up super fast when connected to a charger so I don't think that's the issue. According to the station where I get my gas the ethanol content of the e85 they sell is 70%, so I only put in a few gallons and the rest is 91 octane.

[mblaucoupe135]

Originally Posted by Adam_G42

Not seen this on this car yet, but I ised to have the m235i with n55 engine.
I started getting lengthy cranking to start and eventually failed to start on that car.
Ended up needing a new high pressure fuel pump. Seems the ethanol content in the fuel was causing corrosion to the impeller.
Was rare in the UK at the time as we only had 5% ethanol on fuel. This has gone up to 10% now so I expect it will be as much a problem in the UK as the US these days.

I'm kind of wondering if it might be a fuel pump issue too since I know bmw has had issues with these pumps over the years, especially on their turbo six cars. Maybe I'll try a few tanks without ethanol and see if that changes the way is starts at all.

[Littlecoupe]

Originally Posted by mblaucoupe135

I'm kind of wondering if it might be a fuel pump issue too since I know bmw has had issues with these pumps over the years, especially on their turbo six cars. Maybe I'll try a few tanks without ethanol and see if that changes the way is starts at all.

Most pumps where I am at typically run "up to 10%" ethanol for all octanes (very few have zero). I'm only 3000 KM on the odometer but I haven't noticed any particular starting issues, hot or cold.

I'd honestly be surprised if fuel pumps are still an issue. That's been a problem since the N54 IIRC, lots of time for BMW to resolve it. Possible, though.

I'd also note I had no issues on my 2020 F22 with B58. Older revision, but still, never had a slow start issue. Only when it was -40C, that was a concerning slow crank, but typical at that temp, everything is frozen.

[RockCrusher]

Originally Posted by mblaucoupe135

I have checked the battery and it charges up super fast when connected to a charger so I don't think that's the issue. According to the station where I get my gas the ethanol content of the e85 they sell is 70%, so I only put in a few gallons and the rest is 91 octane.

A battery charging up "super fast" is a red flag.

A battery test I think is called for.

For E85 to have a constant "70%" ethanol content is contrary to the info published for ethanol content of E85. As I noted in an earlier post it varies from 51% to 83% and the ethanol content is related seasonal temperatures. Less ethanol in winter. More in summer. But if you trust the station...

Also I checked my 230i's owner manual and BMW limits ethanol content to 25%. Assuming your DIY fuel blending is able to keep the ethanol content at or below 30% you could still be feeding the engine with ethanol content above 25%.

[mblaucoupe135]

Originally Posted by RockCrusher

A battery charging up "super fast" is a red flag.

A battery test I think is called for.

For E85 to have a constant "70%" ethanol content is contrary to the info published for ethanol content of E85. As I noted in an earlier post it varies from 51% to 83% and the ethanol content is related seasonal temperatures. Less ethanol in winter. More in summer. But if you trust the station...

Also I checked my 230i's owner manual and BMW limits ethanol content to 25%. Assuming your DIY fuel blending is able to keep the ethanol content at or below 30% you could still be feeding the engine with ethanol content above 25%.

Good to know about the battery. Do I need to take it to the dealer to test the battery?

Also, that's good to know about the ethanol in the pumps. I am getting the e85 at a Kum and Go as they are the only station nearby that seems to sell it.
. Not sure how trustworthy they are. But to your point from now on I think I'll calculate the ethanol as being 85% even though the pump says 70%. I did check my manual and I'm pretty sure my car could handle up to 30% ethanol.

[RockCrusher]

Originally Posted by mblaucoupe135

Good to know about the battery. Do I need to take it to the dealer to test the battery?

Also, that's good to know about the ethanol in the pumps. I am getting the e85 at a Kum and Go as they are the only station nearby that seems to sell it.
. Not sure how trustworthy they are. But to your point from now on I think I'll calculate the ethanol as being 85% even though the pump says 70%. I did check my manual and I'm pretty sure my car could handle up to 30% ethanol.

Dealer service can probably test the battery, maybe even de-sulfate it. But it will probably cost you.

Some auto parts stores advertise battery testing. Don't have any experience personally so I don't know if there is a cost nor the quality of the test results.

From my 2022 230i owners manual: "Fuels with a maximum ethanol content of 25 %, i. e. E10 or E25, may be used for refueling."

[mblaucoupe135]

Just wanted to provide an update on this. I had it into the dealer a month or so ago for a routine oil change and told them about the long crank cold start issue. They diagnosed it as a faulty charge pressure sensor. Unfortunately that didn't fix the problem as the car still does it. They also tested the battery and said that was fine so maybe this car just takes a bit longer than most to turn over when cold.

[Pentland]

Originally Posted by mblaucoupe135

maybe this car just takes a bit longer than most to turn over when cold.

I live in an area that hits -10 (centigrade obvs) in winter. I didn’t have any issues last winter.
I think they are fobbing you off especially as they agreed there was problem.

[RockCrusher]

Originally Posted by mblaucoupe135

Just wanted to provide an update on this. I had it into the dealer a month or so ago for a routine oil change and told them about the long crank cold start issue. They diagnosed it as a faulty charge pressure sensor. Unfortunately that didn't fix the problem as the car still does it. They also tested the battery and said that was fine so maybe this car just takes a bit longer than most to turn over when cold.

What Pentland said.

My experience over the years from starting car engines in temps from 119F to 0F is any difference in cranking speed is due to a weak/low battery.

The battery was not bad. In one case -- my Hellcat -- I simply didn't drive the car enough to keep the battery topped up. When I drove it I drove it to work and back a 60 mile round trip. But just letting the car sit for days between uses was enough to have the battery low. The car's electronics represented a considerable power drain when the car was just sitting.

With another car while I used it often enough long story short the problem was a weak (?) alternator. I didn't realize this as the dash battery voltage gauge indicated reasonably good battery voltage.

But finally one day after driving the car a while I noticed the battery voltage was way down to just over 12V. I instantly realized what the problem was and drove straight to the dealer. Tech tested the alternator and found it bad. After a new alternator battery voltage was up a bit showing a voltage level I don't think I ever saw with the original alternator.

Oh, and be sure all interior lights (and exterior lights) are off when you park the car.

A new car started manifesting a bit of a slow crank. Was puzzled by this but before I could get the car in to the dealer for this behavior I was outside one night and happened to see an interior light on. Someone who had been in the car and in the back seat had turned on a small light (reading light?) and left it on. I turned this light off and checked for any others on and after a good drive the next day the slow cranking was gone.

(Which reminds me this same person was in the back seat of my 230ix a while back. I had better check to ensure all interior lights are off.)

More recently a family member bought a new X4 M40i. Was fine for a while then the engine manifested slow cranking upon engine start. Then the engine wouldn't crank.

The family member had the vehicle in for this. Battery fine after a proper charge. Alternator fine. The problem? The owner didn't "trust" the automatic head light control and had been messing around with the various buttons and had turned on the parking lights on one side of the vehicle. 'course, this over time ran down the battery.

[banem2]

Originally Posted by mblaucoupe135

Just wanted to provide an update on this. I had it into the dealer a month or so ago for a routine oil change and told them about the long crank cold start issue. They diagnosed it as a faulty charge pressure sensor. Unfortunately that didn't fix the problem as the car still does it. They also tested the battery and said that was fine so maybe this car just takes a bit longer than most to turn over when cold.

I was having issues with longs cranks and rough starts for a long time. Had it at the dealer many times and told them to check the fuel injectors and spark plugs. Finally they checked them on my last visit and it was indeed the fuel injectors. If they haven’t checked yours yet it might be worth mentioning. My fuel injectors were leaking so badly it was overflowing my oil.

[mblaucoupe135]

Originally Posted by banem2

I was having issues with longs cranks and rough starts for a long time. Had it at the dealer many times and told them to check the fuel injectors and spark plugs. Finally they checked them on my last visit and it was indeed the fuel injectors. If they haven’t checked yours yet it might be worth mentioning. My fuel injectors were leaking so badly it was overflowing my oil.

That's a good idea to check the injectors. I'm going to have the plugs changed this coming week since they are pretty easy to do, not too expensive and I figure it can't hurt.

[blackout_m2]

Hi all

I'm not sure if this is the correct thread to post this on, so apologies if it's not, I'm very new to forums in general
I'm having an issue where my G87 is struggling to rev up to warming up RPM's on startup. I've taken it to BMW, they found oil and residue on spark plug on cylinder 2, so they replaced the whole set, they have tested fuel pressure, injectors, apparently everything to do with the ignition, still can't fix the issue, does anyone have any idea what's happening? The Rev counter bounces at below 1000 rpm for a split second and then revs up. I'm not sure how to attach a video so that I can show here
Any advice or help would be great
Photos of work BMW have done up until now over 2 visits
Thank you