Question about 2002 Nissan Sentra

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99 sentra don't have injector pulse. Did complete tune up, change distributor , tps sensor still no pulse, Have spark .have 40 psi fuel pressure.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1894 Answers

SOURCE: no injector pulse

hello sir,

absence of ground pulse means there is some kind of shorting circuit in your control circuit.

which can make the ground pulse to get shorted there itself preventing it to reach the circuit properly.

thank you

don't forget to rate the solution

good day

Posted on May 27, 2008

  • 84 Answers

SOURCE: wont stsrt

sounds very much like the coolant temp sensor
, this tells the pcm that the engine is cold, sometimes they fail and tell the pcm the car is at -40 degrees, the pcm then tries to compensate by keeping the injectors open for too long flooding the engine. the part is inexpensive, and normally easy to replace. It can be checked with a scan tool, or a volt/ohms tester,

Posted on Dec 22, 2008

  • 740 Answers

SOURCE: 2002 nissan sentra it wont start i got fire on the spark plugs bu

Injector pulse comes from Cam sensor, If you have a BAd CAMSHAFT sensor you will not get injector pulse, replace sensor and that should solve your problem. Good Luck and thanks for using FIX YA

Posted on Jan 21, 2009

  • 1 Answer

SOURCE: 89 s10 2.5 has fuel and fire injector has power but no pulse

injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.

Posted on Feb 16, 2009

alicantecoli
  • 22156 Answers

SOURCE: 99 Chev Blazer won't start

factory immobiliser cut in by the sound of it

Posted on Apr 11, 2009

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1991 chevy lumina will crank but wont start I checked the fuel pressure it squirts out good and the fuel pump sounds strong I checked spark on the coil its sparking good! I charged the battery its fully...


If you have spark at all the plugs, the crank sensor should be ok. You should use a gage to check fuel pressure? I don't know engine size? For the 3.1L engine, my info says 40--46 psi.
It is possible to have spark at the plugs, but, the computer doesn't see rpm signal. If that is the case, no fuel injector pulse. The purple wire with white tracer carries rpm signal from ignition module to pcm, that wire has dc pulse, engine cranking. If nothing there, have to check ignition module.
How long since a tune-up? Any applicable trouble codes?

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I have a 1996 nissan sunny fuel injected ... i have changed the plugs, injector rail, distributer, throttle body, and my engine is still misfiring can some one advise me please..


inspect the wiring for loose connections or bad wiring.

try adjusting first the distributor by turning it. It should adjust the timing. Other than that inspect the timing on the timing chain or the chain may have developed a slack.

Sep 02, 2011 | 1996 Nissan Sentra

1 Answer

Replaced ignition module, spark plug wires, distributor cap, fuel filter, and thermostat. car starts then after a while you turn it off and try to restart it, but all it does is crank, will not turn over....


COULD BE FUEL PUMP.CHECK FUEL PRESSURE SHOULD BE 40 - 47 PSI. WITH NEW FUEL FILTER. IF FUEL PRESSURE OKAY.YOUR SPARK PLUGS COULD BE FOULING OUT BY LEAKING FUEL INJECTORS.CLEAN FUEL INJECTORS BY ADDING A CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS.WHEN YOU HOOK UP FUEL PRESSURE TESTER WITH IGNITION SWITCH ON ENGINE OFF FUEL PRESSURE SHOULD READ 40 PSI. TURN OFF IGNITION SWITCH IF FUEL PRESSURE DROPS FAST YOUR FUEL PUMP CHECK VALVE BAD.IF FUEL PRESSURE DROPS SLOWLY IN TEN MINUTES TIME FUEL INJECTORS IS LEAKING A NEED CLEANING.INJECTORS SPRAYING TIP CLOGGED WITH CARBON BUILD UP CAUSING THEM TO LEAK DOWN WHEN ENGINE OFF.

Jul 25, 2011 | 1991 Oldsmobile 88

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99 durango 165,000 miles runs good when running. It had the PCM changed when I bought it. Did a tune up and all maintenance. It would shut down after a while. Replaced coll temp,wire harness to PCM, map...


Make sure they put the right pcm in it. The dealer can tell you with the vin#. Then check to see that your pcm has that same number, letters etc. All may not be needed. Try to have the pcm#s when you call them

Apr 30, 2010 | 1999 Dodge Durango

5 Answers

I have a 1996 GMC yukon with 5.7 engine it is not firing I have changed the coil this did not fix problem what do I check next


Check for injector pulse if no pulse with no spark check ignition module in distributor or crank sensor.

Nov 11, 2009 | 1996 GMC Yukon

2 Answers

Cranks but wont start


Engine Cranks But Will Not Start

For an engine to run, you need three things to happen inside the engine. Compression, fuel and ignition, without any one of these components the engine will not run.
Basic Checks:

A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)

Jul 14, 2008 | Hyundai Motor 2002 Sonata

2 Answers

Doesn't start


1. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
2.Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
3.Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
4.Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
5.Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)

Jun 16, 2008 | 2000 Nissan Quest

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