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I have a 1998 BMW 528i e39. It has about 140,000 miles on it. I***8217;m not mechanically inclined, but I love this car very much and want to be sure that I take the proper steps to maintain it. Any advice or thoughts are appreciated!

The car was running totally fun as recently as this past weekend. This Monday morning, I started it and let it idle for a minute because it cold outside (about 40 degrees Fahrenheit). At first, it would top out at 2,000 rpms. After a few minutes, a chugging sound started and the ride was very rough. The chugging continued whether I was on the accelerator or not. I pulled over to give it a rest and a restart. When I turned it on again, it would only go to 1,000 rpms, and eventually, the engine wouldn***8217;t start at all.

I brought it to an independent mechanic to look at it but they couldn***8217;t target the exact issue as of today.The engine error codes reported that five out of six cylinders were misfiring. Additionally, there was a mixture deviation fault and oxygen sensor fault. Does anyone know what could bring the car from running totally fine to having such issues as stated above?

They're bringing in a specialist to look at it but I want to be prepared going into the specialist's report. What could the possibilities be? What should I looked for?

Thank you in advance to any feedback!
 

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Bad fuel pump perhaps. Sounds like you're losing fuel pressure every time you start the car. These things do tend to go bad overnight.
 

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Bring in a specialist??? Sounds like a scam. Run fast buddy, get away from this people.

Like the previous post, it could be your fuel filter or fuel pump or you may have a big air leak on CCV system.

Park the car, buy a good code reader. No one start at master mechanic, it's not rocket sci...
If you have the will and some self confidence in wrenching you can do it.
 

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Check all you hoses first, try disconnecting the maf, does it run better then?
 

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Welcome. Your ***8216;98 is indeed a great car.

But it is 20yrs old. If you are not going to wrench on it yourself, which is fine, please find a local independent mechanic that works on mostly BMWs, and make him your friend.

If you post your city in your profile, I am sure we can give you some recommendations.
Also look at bimrs.org for an indy near you.
 

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I have the same car 1998 528i with 175K miles, it runs fine b/c I maintain it.

Check:

- Spark Plugs record, were they ever replaced?

- Fuel Pump, Fuel Filter.

- Cracked rubber boot causing stalling.

- Bad siphon pump: does the car acts up when fuel is below 1/4 tank?
 

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I wouldn't start going replacing things just yet..

You have a mixture deviation AND a o2 code...

that becomes a no run problem right there,

Im going to assume that you have had a check engine light on for a while? This can go 2 ways and its kinda hard to tell now.. because its compounded it self..

Of course you want to rule out like fuel and spark (i dont see coils and plugs going bad like that) and these stock OEM original fuel pumps are generally good for 200,000

confirm you have proper fuel pressure,

Unplug the maf and try starting it, (if you can get it started) you need to vue the live data to see what the advance is doing,

the combo of lean, and o2 is probably throwing you just outside the ratio require to run...

some communication with the car will be necessary

If you dont have the time or will to work on the car.. your going to just need to take it someone who knows that they are doing,

it could turn in to a 1400$ bill real quick.. Let us know what you want to do
 
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