I finished rebuilding my M44 in my 318i (stock rebuild, but pretty much new everything) about 1,500 miles ago. Ever since completing the rebuild, the long-term fuel trim is at +20 to +28 percent, and in town it's getting about 18 mpg. Ouch. The car also needs to pass emissions in 3 weeks.
I've replaced:
- MAF (with another used, about $100)
- 02 Sensor (req'd exhaust work, $180)
- Pre and post AST+C intake boots (they were both cracked)
I couldn't see where any other vacuum leaks could be from, so I took it to a BMW specialist and they smoked the intake. Unfortunately I couldn't be around when they smoked it. They identified two possible leak sources:
- Vacuum lines from the fuel injectors
- A leak from a possible crack on the DISA valve
I replaced the vacuum lines from the fuel injectors, and no change. That leaves the DISA valve. It's about a $280 part, non-OEM. I can't see any cracks on it (I didn't remove it). Has anyone had experience with this part failing, or what the replacement procedure is? It looks like the lower intake manifold has to come out, which is a real pain.
I've replaced:
- MAF (with another used, about $100)
- 02 Sensor (req'd exhaust work, $180)
- Pre and post AST+C intake boots (they were both cracked)
I couldn't see where any other vacuum leaks could be from, so I took it to a BMW specialist and they smoked the intake. Unfortunately I couldn't be around when they smoked it. They identified two possible leak sources:
- Vacuum lines from the fuel injectors
- A leak from a possible crack on the DISA valve
I replaced the vacuum lines from the fuel injectors, and no change. That leaves the DISA valve. It's about a $280 part, non-OEM. I can't see any cracks on it (I didn't remove it). Has anyone had experience with this part failing, or what the replacement procedure is? It looks like the lower intake manifold has to come out, which is a real pain.
318i vacuum leak near DISA valve
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