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Anonymous Posted on Aug 04, 2014

No injector pulse

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charles

  • 244 Answers
  • Posted on Aug 29, 2012

SOURCE: 2000 nissan altima no spark on injectors #3 and #4

your ecm most probable cause

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2answers

2006 wrangler x no pulse on injector #3&4, others are fine. (name them? all?)

Cud b voltage issue. Unplug them and clean contacts. Also u cud unplug computr and clean pins . Older cars have corrosion
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2011 swift 1.5 no injector pulse no spark

blown fuse. ; is first, as per always.
2nd is scan it, did you scan it yet? that is always 2nd.
all efi engines, all ECU , all cut injectors for (noid lamp test dead?)
you said pulse,does that mean fuel pulse or electronic pulse to injector coil..... ? all injectors dead. or just 1. same for spark.
toss coin land, noid dead. all noids
loss of. NOID signals.!
1; spark
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1answer

89 pickup 22re. no fire on no. 1 cylinder

It could be a fault in the wiring for #1 injector, or a defective spark plug in #1.

All four injectors have a hot wire to them with key on, the same black with red stripe wire is spliced to all four. Check if #1 has this hot wire with key on. The injector ground wire for #1 and #3 is a white wire with red stripe. These two ground wires splice together before the ground wire enters the computer. So the computer pulses #1 and #3 injectors simultaneously. (Injectors 2 and 4 have a similar set up, with a white wire being their ground.) If you have a hot wire to #1 injector, but no pulse on it, but #3 injector is pulsing (putting fuel into the cylinder), then the ground wire for #1 may be broke before it connects with the #3 injector ground. The wires and the splice are probably buried inside the engine wiring harness, so one could check for continuity on the ground side for 1 and 3. With key off, use an ohmmeter and check resistance between the grounds for #1 injector connector and #3-check on the harness side of the injector connectors-it should show low resistance-low ohms value. If very high resistance is shown, trace the ground wire from #1 injector.
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1answer

98 eclipse 2.0 has spark but no injector pulse on #2 or #4

Injectors are pulsed by ECU using ground. You should check if there is any current coming out from fuse box.Most fuse boxes with injector fuses will share two injectors off one pin. So you may have two wires coming out from fuse box, and it is very common to be paired 1-3 & 2-4.

If you need further help, reach me via phone at https://www.6ya.com/expert/david_f2436a37cbb50365

0helpful
1answer

2004 jeep grand Cherokee fuel injectors stay open

If not pulsing, could be a bad pcm. The computer grounds the injectors internally for a split second to pulse them . If trash or debris is not making them stick open, buy a "noid light" for checking injector circuits. Plug it in to #1 or #5 and crank engine over: if circuit is working right, noid light will be blinking. If light is on steady, computer is not interrupting ground to cause pulsing.
0helpful
1answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors

Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.
1helpful
1answer

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under drivers seat to rear of 2 tin covered relays 1 for fuel pump 1 for pulse injetors and spark [must have twin contacts inside] if wrong relay you will either get spark no injector pulse or pulse injector no spark [had similar prob myself]
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