Rev Your Engines for the ASE A8 Exam 2025 – Turbocharge Your Test Performance!

In the scenario where a vehicle's manifold vacuum is low but steady, both technicians may present valid points about the implications for the air/fuel mixture. Low manifold vacuum typically suggests that the engine is making more power, which can be the case when the throttle is opened wider or under heavy load. A steady reading indicates that there are no significant leaks in the manifold or vacuum lines.

Both technicians likely identify that a low manifold vacuum can lead to a richer air/fuel mixture because the engine is drawing in more fuel relative to air under these conditions. This mixture can be caused by various factors, such as an improperly adjusted fuel system or other engine performance issues that affect the balance of air and fuel.

Technician A may assert that a low steady vacuum does not necessarily mean it is rich but could imply a different engine condition, while Technician B might argue that under such conditions, the fuel at the injectors may be increased to maintain power. However, in most scenarios, the steady low vacuum would support the idea that changes in the air/fuel mixture balance are necessary to achieve optimal performance despite the low vacuum reading.

The conclusion that both technicians could be correct thereby aligns with the possibility that their assessments of the engine's mixture under low vacuum conditions can be interpreted