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Hey people, looking for advice. I'm trying to locate a vacuum leak on my '89 2.6, since my economy guage is about directly down the middle of the meter at idle. What's strange is the needle on the economy guage drops down to about 1/4 of the full travel of the needle upon deceleration.
At any rate, after hooking up the vacuum line onthe 6th tube of the intake manifold to the transmission control module, I think I may have found the cause. But I'm not sure where it hooks up. It is located on what I believe is the fuel tank vent valve. And seems to lead under the intake manifold.
Any help as to where this might connect would be fantastic.
Update: ended up connecting it to the bottom-most vacuum port on the inside of the intake manifold (see pic) and still have a leak somewhere. Same thing, needle halfway down the meter.
At this point I feel a vacuum line or two are not connected to their proper places.
You're gonna want to smoke test the induction system for vacuum leaks. There's way too many vacuum hoses on this car, and this will reveal all leaks very quickly.
The inlet at the AFM plate has an OD of 110mm. You'll need to cobble together some reducers so a typical smoke machine will seal up to it properly.
190E 2.6L 1989, 190E 2.6L 1988, BMW 535dXdrive 2014, BMW 428i 2015
Indeed you need a $60 smoke machine. Oddly that same line you point in your picture was the exact same line that had a hole in, on my '89. It was rubbing against the intake metal for 210K miles and eventually developed a quarter inch hole in it.
However, I'm pretty sure you also have a benign vacuum leak in your HVAC system. That is the only thing that would effect your econo-meter in such a major way.
For that you will need a Mity-vac. Another $60. Does playing with the HVAC buttons affect your econo-gauge? If so, it is usually one or more of the vacuum pods.
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