What to know about the Intake Manifold Runner Control:
Your engine requires air in order to burn fuel, and varying amounts depending on the speed and driving condition. Older cars depended on nothing more than a basic air intake that pulled fresh air in through the filter and delivered it to the intake manifold. However, newer cars have the means of adjusting the flow of air through the intake in relation to driving conditions. These vehicles are furnished with intake manifold runner control modules, which are vacuum solenoids that run a butterfly valve in the intake. During slower driving when the need for air is less, the butterfly stays closed. However, in aggressive driving situations, the butterfly opens and maximizes the amount of air sent to the intake. The computer compensates for this by adjusting the fuel mixture, and the result is an increase in performance.
Facts to Note:
The intake manifold runner control is not checked during normal upkeep.
Both open and closed positions can cause damage to the engine.
How to Fix:
The engine trim cover is removed from the top of the engine
The faulty intake manifold runner control is taken out
The new intake manifold runner control is fixed
The engine trim covers are reinstalled
The engine is scanned and tested for proper operation
If the butterfly fails to open or close (i.esticks in one position or the other), the engine can sustain damage through either lean or rich running conditions. We recommend having the condition analyzed by one of your expert mechanics.
Common symptoms indicating you may need to changethe Intake Manifold Runner Control:
Reduced engine performance output
Increased fuel consumption
Check Engine light is on
Importance of this service:
Considering the fact that a faulty intake manifold runner control could cause both lean and rich operation, it’s essential to have the controller’s operation checked. This will require your expert mechanics to retrieve the diagnostic codes via the OBDII connector and test the controller for operation. We recommend having this service performed straightaway.