see this steps and fix it. God bless you
When the engine cranks normally but won't start, you need to check ignition, fuel and compression
Ignition is easy enough to check with a spark tester or by positioning
a plug wire near a good ground. No spark? The most likely causes
would be a failed ignition module, distributor pickup or cranshaft position sensor CKP
A tool such as an Ignition System Simulator can speed the diagnosis
by quickly telling you if the ignition module and coil are capable of
producing a spark with a simulated timing input signal. If the
simulated signal generates a spark, the problem is a bad distributor
pickup or crankshaft position sensor. No spark would point to a bad
module or coil. Measuring ignition coil primary and secondary
resistance can rule out that component as the culprit.
Module problems as well as pickup problems are often caused by loose,
broken or corroded wiring terminals and connectors. Older GM HEI
ignition modules are notorious for this. If you are working on a
distributorless ignition system with a Hall effect crankshaft position
sensor, check the sensor's reference voltage (VRef) and ground. The
sensor must have 5 volts or it will remain permanently off and not
generate a crank signal (which should set a fault code). Measure VRef
between the sensor power supply wire and ground (use the engine block
for a ground, not the sensor ground circuit wire). Don't see 5 volts?
Then check the sensor wiring harness for loose or corroded connectors. A
poor ground connection will have the same effect on the sensor
operation as a bad VRef supply. Measure the voltage drop between the
sensor ground wire and the engine block. More than a 0.1 voltage drop
indicates a bad ground connection. Check the sensor mounting and wiring
If a Hall effect crank sensor has power and ground, the next thing to
check would be its output. With nothing in the sensor window, the
sensor should be "on" and read 5 volts (VRef). Measure the sensor D.C.
output voltage between the sensor signal output wire and ground (use the
engine block again, not the ground wire). When the engine is cranked,
the sensor output should drop to zero every time the shutter blade,
notch, magnetic button or gear tooth passes through the sensor. No
change in voltage would indicate a bad sensor that needs to be replaced.
If the primary side of the ignition system seems to be producing a
trigger signal for the coil but the voltage is not reaching the plugs, a
visual inspection of the coil tower, distributor cap, rotor and plug
wires should be made to identify any defects that might be preventing
the spark from reaching its intended destination.