What does the DISA valve do on BMW?
The DISA valve is located in the inlet plenum chamber and controls the variable length intake manifold giving better torque at low revs by closing, keeping the intake runner long. After higher engine speeds, it opens up and makes the intake runners shorter for more horsepower.
What is BMW M42 engine?
The BMW M42 is a DOHC straight-four petrol engine which was produced from 1989-1996. It is BMW’s first mass-production DOHC engine and was produced alongside the BMW M40 SOHC four-cylinder engine as the higher performance engine. The M42 was replaced by the BMW M44, which was introduced in 1996.
What happens when DISA valve fails?
The first things to usually that go bad on a DISA valve are the seals. As the flap closes, it relies on the seal to keep any excess air from moving through it. When this seal fails, you’ll get excess air in the engine, which ultimately results in poor fuel economy.
Does M52 have DISA valve?
The DISA valve is a typical fault of the M52 and M54 engines. A faulty DISA will result in missing low-end torque and can result in a rattling sound coming from the intake. Usually unplugging a faulty DISA will stop the rattling. Changing a DISA valve is easy, and can be done in around 30 minutes from above the engine.
How do you know if DISA is bad?
Symptoms of BMW DISA Valve Failure
- Poor fuel economy.
- Rattling noise coming from the engine.
- Loss of power at mid and high RPM’s.
- Lack of low-end torque.
- SES/CEL light and codes for running lean.
Can you drive without a DISA valve?
Its okay to run without it, but I recommend you replace it as soon as you can. 1. Its okay for the disa to be absent, but you might lose a little drivability.
What size engine is M42?
The M42 is the last chain-driven engine fitted to the E30, and the first 16-valve unit. It came in one capacity, 1796cc, and was fitted to one model, the 318iS.
Which is better M42 or M44?
The BMW M44 is a DOHC four-cylinder petrol engine which replaced the BMW M42 and was produced from 1996-2000 at the Steyr factory. It was produced alongside the BMW M43 SOHC four-cylinder engine, with the M44 being the higher performance engine.
How much does a M42 weigh?
Product information
| Product Dimensions | 4.65 x 2.48 x 1.5 inches |
|---|---|
| Item Weight | 2.08 ounces |
| ASIN | B08PDDGRQB |
| Item model number | M42-RGB-BLACK |
| Batteries | 1 Lithium ion batteries required. (included) |