Quote:
Originally Posted by jake12tech
Manifold boost sensor is what I should have said. Where is the switchover valve? I will check that line with the clamp and see if it is clogged.
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The manifold sensor is directly above the sense port. You need to disconnect the hose from the sense port and remove the fitting. Make sure it's clear. then remove the hose from the alda and apply some air to the hose that you pulled from the manifold, make sure the air reaches the alda. If that's the case, the switchover is fine. The switchover should be somewhere on the left inner fender, it's been a while since I've worked on a 124. The photos show the sense port and two switchovers on my 190DT. One of the switchovers is controlled by the overboost sensor and shunts off the boost sense line when an overboost condition is present. In all normal circumstances it should be off and there should be pressure continuity between the manifold and the alda. The switchover sometimes becomes packed with soot and that could cause the problem.