what can cause injectors not to fire?
what can cause injectors not to fire? I cant get my injectors to fire, ive been trying and troubleshooting alot of diffrent things.
I got good injectors,
Fuel pump is working(checking pressure when i get my guage on),
Car cranks,
got spark,
Car started for a brief second with starter fluid,
VATS is taking care of,
What else should i check, and what all needs to be connected to get the engine started.
I got good injectors,
Fuel pump is working(checking pressure when i get my guage on),
Car cranks,
got spark,
Car started for a brief second with starter fluid,
VATS is taking care of,
What else should i check, and what all needs to be connected to get the engine started.
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Joined: Jan 2005
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are you getting +12 to the injectors? You should have a constant +12 on one side, and the computer would ground the other side to fire the injector. If you have spark, your PCM is probably reading RPM, so I'd start on the +12 side.
Originally Posted by 99c5vert
are you getting +12 to the injectors? You should have a constant +12 on one side, and the computer would ground the other side to fire the injector. If you have spark, your PCM is probably reading RPM, so I'd start on the +12 side.
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Joined: Jan 2005
Posts: 310
Likes: 0
OK. looking at diagnostic steps for a no-start condition... here are a few things to try...
some of the things you have checked already (fuel pressure, +12 to injectors)
Do you have any trouble codes?
a couple of other things:
1- it indicates a bad mass air flow sensor may cause a no start condition - to test, disconnect MAF. PCM will default to speed density.
2- turn ign. off. disconnect crank shaft pos sensor, turn ign on, check voltage. does it have 12V? do the same with camshaft position sensor.
2- possible faulty crank or cam position sensors.
some of the things you have checked already (fuel pressure, +12 to injectors)
Do you have any trouble codes?
a couple of other things:
1- it indicates a bad mass air flow sensor may cause a no start condition - to test, disconnect MAF. PCM will default to speed density.
2- turn ign. off. disconnect crank shaft pos sensor, turn ign on, check voltage. does it have 12V? do the same with camshaft position sensor.
2- possible faulty crank or cam position sensors.
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Originally Posted by 70 LS1
How did you take care of VATS?
What do i check the voltage on for the sensors? the wires going to the sensor? just one of the wires to ground or test them together?
TECH Apprentice
Joined: Jan 2005
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Originally Posted by 91sbcamaro
I have resistors taking the place of the resistor in the key, and ive been told that the car would start for a few seconds anyway even with a faulty VATS setup.
What do i check the voltage on for the sensors? the wires going to the sensor? just one of the wires to ground or test them together?
What do i check the voltage on for the sensors? the wires going to the sensor? just one of the wires to ground or test them together?
