What Causes BMW to Smoke?

Smoke Coming From an Exhaust

BMW valve stem seal replacement

When you start your BMW you see smoke billowing from the exhaust. This is a clear sign of a problem and you find yourself asking, “What causes BMW to smoke?” If the smoke is blue or gray in color you may be experiencing a common problem for BMWs—a malfunctioning valve stem seal. These components control the amount of oil that goes into the valve stem interface to lubricate the valve guide and combustion chamber. It usually fails because of a clearance problem between the valve and valve guide that’s located in the cylinder head. If it fails and bluish or gray smoke puffs out of your exhaust, the seal needs to be replaced. 

Anytime you have a problem with your BMW smoking and need a BMW valve stem seal replacement in Dallas, TX, the specialists to turn to are those at Bimmer Repair. BMWs are what we know best, and we will take care of your ultimate driving machine. Schedule a service appointment by calling 469-471-6433.

How do you diagnose a bad valve stem seal?

If you have a bad valve stem seal, the most common indication of a problem is bluish-gray smoke blowing from the tailpipe when the car is first started. Smoke may also appear after the vehicle has idled for a long time after stopping at a light or stop sign. You may also see smoke if you’re accelerating after coasting down a steep downgrade. If your vehicle is consuming oil faster than normal, the seal may be bad.

Are valve stem seals hard to replace

For those mechanics who specialize in BMW repair, like Bimmer Repair, valve stem seals are not hard to replace. That’s because they’ll have the skills and right tools to make this repair or any other repair on your vehicle. When you have the specialized tools that fit perfectly to BMW parts, repairs are made to last, and repair costs are lowered. If you go to any other mechanic who doesn’t have the specialized tools and skills, the repairs may not be reliable and will probably cost much more. If you plan to make the repairs yourself, you want to make sure you have the right tools and parts to make the repairs.

Valve stem seal replacement kit

While there are valve stem seal replacement kits on the market, if you are making repairs yourself, you want to make sure you have the right parts for your BMW. Make sure the parts you purchase are specifically designed for your vehicle. If they aren’t perfectly fitted, you may damage other engine components that can lead to costly repairs later on. Check with the specialists at Bimmer Repair to make sure the parts you purchase are the right ones for your car.

How do you stop a valve stem seal from leaking?

The primary problem when a valve stem seal malfunction is oil leaking. There are some temporary fixes you can make to keep the oil from leaking until you can get your vehicle to a shop for a repair.

  • Put in an oil stop-leak additive in the oil filler tube. The additive will swell the seal which may stem the leak.
  • A high mileage motor oil has conditioners in it that can prevent or reduce leaks. Only add high mileage oil to a car that reached 75,000 miles or more.
  • Replace the seal that’s leaking.

How do you replace a valve seal without removing the head?

If you are replacing a valve seal yourself, you can repair the seal without removing the heads. You will need specialty tools like an adapter to do so. 

  • Make sure valves are closed on the cylinder.
  • Remove the spark plug and fill the cylinder with air.
  • Use the adapter and thread it through the spark plug hole and connect it to the air supply.
  • Remove the valve spring keepers and the old seal before replacing it.

The repair is fairly complicated, so if you have any doubts, it’s best to get help from a professional. BMW specialists like those at Bimmer Repair will have the right skills, tools and parts to make the repair. Never hesitate to call us and speak to one of our service advisors if you’re having any problems with your BMW.

Engine Valves

How much does it cost to replace valve stem seals?

A valve stem seal replacement cost will vary. On average the cost will run between $900 to $1,800. The cost will depend on the make and model of the vehicle as well as where you take the vehicle. If you have a BMW, it’s best to take it to a specialist like Bimmer Repair for repairs. We have the skilled technicians, the right parts, and right tools to get the job done. Because of this, specialists can keep costs low. Non-specialty shops may have to order parts, may not have precise tools, or technicians highly skilled in making repairs on your BMW. This could result in higher costs or inadequate repairs that could lead to costly repairs later on.

If you’re seeing bluish-gray smoke puffing out of your BMW’s exhaust, you’ll need experts like ours to make sure you valve stem seal replacement in Dallas, TX gets done right. Our skilled technicians will be able to diagnose any problem your car may have and get repairs done effectively. Call our service advisers at 469-471-6433 now to book an appointment.