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Showing content with the highest reputation since 11/16/2025 in Posts
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If the oil cap is hard to remove, you have a high vacuum level in the sump, which is bad for a variety of reasons, including lean stalling. The correct way to access the AOS is to fully warm up the engine by driving the car for 10-15 min, then replace the oil cap with the one in the picture above with a hose that connects to the digital manometer. If the vacuum level exceeds 6-7 inches of water vacuum, the AOS is leaking air into the intake system, causing the lean stall conditions. The normal level of vacuum is typically 4-5 inches of water, which is a really weak vacuum level, so it doesn't take much of a leak to cause problems, which is why we always checked every car that passed thru the shop with the manometer.2 points
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The AOS can either be pin pointed or eliminated by having the car's sump vacuum level checked with a digital manometer (most quality shops have them as the AOS is a perpetual issue; surprise the dealer didn't do this).
2 points -
See if any of the fault codes have changed. If not, then I would still go the path based on the FRAU readings.1 point
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P2189 Lambda control adaptation FRAU (lower load range) (FRAU > 0.7) - below limit value Possible fault causes - Incorrect main filling signal from hot-film mass air flow meter - Fuel pressure too high - Injection valve faulty (dripping) - Tank vent faulty (does not close completely) P2189 Lambda control adaptation FRAU (lower load range) (FRAU > 1.3) - above limit value Possible fault causes - Intake system leaking (secondary air) - Incorrect main filling signal from hot-film mass air flow meter - Leak in exhaust system - Fuel pressure too low - Fuel injector faulty (stuck) - Fuel pump delivery too low P2187 Lambda control adaptation FRAU (lower load range) (FRAU > 0.7) - below limit value Possible fault causes - Incorrect main filling signal from hot-film mass air flow meter - Fuel pressure too high - Injection valve faulty (dripping) - Tank vent faulty (does not close completely) P2187 Lambda control adaptation FRAU (lower load range) (FRAU > 1.3) - below limit value Possible fault causes - Intake system leaking (secondary air) - Incorrect main filling signal from hot-film mass air flow meter - Leak in exhaust system - Fuel pressure too low - Fuel injector faulty (stuck) - Fuel pump delivery too low1 point
