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The MAF sensor must be oriented correctly in the induction system – note the arrow on the sensor indicating flow direction. Be sure to weld the
mounting boss correctly – the sensor will only mount one way in the boss (see diagram).
Weld the boss in place before installing the sensor. When installed in the vehicle, the MAF sensor should be mounted with the connector end
pointing between horizontal and fully upright – do not mount with the connector oriented downward.
MAF SENSOR MOUNTING GUIDELINES
MINIMUM 6" STRAIGHT SECTION
TUBE
MAF SENSOR MOUNTING BOSS
MINIMUM 10" FROM THROTTLE BODY
Air Cleaner:
It is recommended that a dry element air cleaner be used. NOTE: Fueling cannot be guaranteed if an oiled element type air cleaner is used.
Oxygen Sensors:
NOTE: It is critical that the Oxygen Sensors are mounted per the instructions below. The exhaust system MUST be properly sealed – any leak
near the sensors (upstream or downstream) can cause incorrect operation of the fuel control system. Vehicle performance and/or driveability
may be affected if sensors are not mounted as recommended or if an exhaust leak exists. Leak check the exhaust system to ensure adequate
sealing (even small leaks can affect fuel control).
Oxygen Sensors should be mounted in the collector area of the exhaust manifolds in a location that allows exhaust from all cylinders to be sampled
equally (stock exhaust manifolds include a mounting boss for the oxygen sensors). Be sure the connectors and wiring are routed away from high
heat areas. The oxygen sensors should be mounted with the sensor tip pointing between horizontal and fully downward – do not mount with the
tip oriented upward. Weld in the mounting bosses supplied (7/8" hole) if using headers.
Positive Crankcase Ventilation System (PCV)
How to set up your PVC system:
There are two ports on the engine that make up the PCV system. The ports on the engine are:
1.
Left rear (driver side) valve cover.
2.
Top center of the inlet manifold. The ports with silver tubes may look simple but, they should not be modified. The tubes have a small
orifice within them that is used in place of a PCV valve of earlier designs.
There is one fresh air port which is on the front of the right (passenger side) valve cover. Again this is a silver tube that faces forward on the valve
cover. This port should be connected to filtered clean air. This connection must be within the engines air cleaner system and must be between the
MAF (Mass Air Flow Sensor) and engine's throttle body. The engine burns the air that enters the PCV system so, if the fresh air port is prior to the
MAF then, this air will enter the engine without being measured by the MAF and adverse engine operation may occur.
Power Brake Booster Vacuum Source: The vacuum port for the Brake Booster is a plug in the rear of the intake manifold. If you need the vacuum
source for your brake system the plug needs to be removed and you will need fitting #12559760 available from any GM dealer.
Oil Pressure Sensor: The Engine oil pressure sensor is an optional connection and is not required for engine operation. If needed, it can be removed
and replace with gage specific sensor.
DR-525 Series Crate Engine Control System
ALL INFORMATION WITHIN ABOVE
Date
BORDER TO BE PRINTED EXACTLY
31MY16
AS SHOWN ON 8.5 x 11 WHITE 16
POUND NON-BOND RECYCLABLE
02FE21
PAPER. PRINT ON BOTH SIDES,
EXCLUDING TEMPLATES. TO BE
03MY23
UNITIZED IN ACCORDANCE WITH
GMCCA SPECIFICATIONS.
AIRFLOW DIRECTION
TO AIR
FILTER
Revision
Init Rel – Blake Nye
Revision - Blake Nye
Revision - Blake Nye
MAF SENSOR
MOUNTING AREA
UP
PART No.
Rev 03MY23
19329244
Auth
DR
Installation Instructions
Title
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DR-525 Series Crate Engine Control System
NA
PART No.
SHEET
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