Chart A-3A Engine Cranks But Will Not Run

Fig. 030 - Wiring Diagram for Chart A-3A Engine Cranks But Will Not Run. VIN W:

CHART A-3A

ENGINE CRANKS BUT WON'T RUN

2.8L "X" SERIES

FUEL INJECTION (PORT)

Battey condition and engine cranking speed are OK, and there is adequate fuel in the tank.

Fig. 026 - Chart A-3A Engine Cranks But will Not Run (1 of 2):

1. A "SERVICE ENGINE SOON" light "on" is a basic check for ignition and battery supply to the Electronic Control Module (ECM).
2. No spark indicates a basic HEI problem.
3. This test will determine if the ECM is receiving the reference signal and controlling the injectors.

If the test light "blinks" while cranking, then ECM control should be considered OK. How bright the test light "blinks" is not important. However, the test light should be a J-34730-2 or equivalent.

4. Use pressure gage. Wrap a shop towel around the fuel pressure tap to absorb any small amount of fuel leakage that may occur when installing thegage.
5. Diagnostic aids:
a. An EGR valve sticking open can cause a high air/fuel ratio during cranking. Unless engine enters "Clear Flood' at the first indication of a flooding condition, it can result in a no start.
b. Check for fouled plugs:
c. If the TPS is sticking or binding in the wide open throttle position, the ECM will be in the "Clear Flood" mode. In this mode the fuel is completely turned off which would cause a no start.
d. A defective cold start circuit or water in fuel line can cause a no start in cold weather. To check cold start circuit: See Chart A-9.
e. A defective MAF Sensor may cause a no start or a stall after start. To determine if the sensor is causing the problem, disconnect it. The ECM will then use a default valve for the sensor, and if the condition is corrected and the connections are OK, replace the sensor.
f. Also check that injectors on both sides of engine will cause a test light to "blink".