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The car runs till it gets hott then the injectors stop pulsing until lot cools back off Dose anyone know what pulses the injectors

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Injectors do not pulse. there should be a constant pressure to them at all times. I need more info. Could be bad pump, regulator, or etc...

Posted on Mar 18, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

johnny5846
  • 379 Answers

SOURCE: no injection pulse

looking at the schematics, well the PCM controls the pulse width to the injectors , BUT , there is a injector coil fuse , its #2 in your kick panel fuse box , a 20 amp , check it , sure hope that fix ya . that would be sweet .

J5

Posted on Jan 15, 2009

  • 383 Answers

SOURCE: Little to no injector pulse only when starter is engaged

95-97 Maximas had a problem where condensation from the A/C would accumulate in the a/c evaporator case from the drain becoming restricted or blocked, When this would occur, condensation would drip onto the ECM and a problem would develop with misfire and/or starting. I would look at the ECM where the harness connects to it for corrosion problems. If you find it, there is a chemical spray which can be used to clean the terminals and/or you can clean them, although it is time consuming and difficult to due because of how small the terminals are. After things are cleaned up, lightly coat the connections with a dielectric grease. This will prevent electrolysis.I believe you can buy these at Radio shack and possibly at an automotive parts supplier.
Also a drop in voltage during the cranking phase will cause a weak spark. Your ignition is what pulses the injectors. It takes a minimum of 9.6 volts, but ideally you want at least 10.5 or more during the cranking phase if you want to get a spark worth anything. Check the voltage on the primary side of the coil while cranking the engine.
I'll watch to see if things work out for you, let me know. ....mybunkey

Posted on Apr 18, 2009

  • 2418 Answers

SOURCE: crank no start: has no spark and only has injector

Fuel pump, you have to have press in the rail to fire all injectors- she will run on ether but not good for her. Ck your pump and any related fuses,relays,wiring.

Posted on Jul 12, 2009

  • 740 Answers

SOURCE: 350 with TBI intermittent injector pulsing

this could be a bad ingnition module or a loose wire. but i think on this truck the injectors do get singnal from the ecm

Posted on Jan 06, 2010

afarri
  • 1386 Answers

SOURCE: Have a 2005 Smart Car

Hello and welcome to FixYa!

Have you replaced the fuel pump? Try to turn the car on ON position but don't crank it. Loosen the bolt on the fuel rail and observe if there's fuel coming out. If there's none then you have a bad fuel pump which will require replacement to resolve the problem.
Hope this helps and thank you for using FixYa! Have a good one!

Posted on Jul 23, 2011

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Check the fuel pressure with a fuel pressure gauge, when the truck stops See if the fuel injectors are getting a pulse with a niod light plugged into the harness "while cranking. motor". IF you get no pulses (NO flashing noid light) see if the security light is ON, on the dash. If the security system "kicks on" it will kill the pulses to the injectors.

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Do you have power going to the injector ? And do you have spark to the plugs ? The computer uses the crank signal from the distributor to know when to fire the injector.

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crank angle sensor test then ohms test back to ecu

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My injectors arent pulsing on my 1989 k1500 suburban. I have 12 volt power to the injectors and have replaced the module in the distributior. Any one have an anwser for me


The injector ground circuit must not be working. What causes the pulse is when the computer internally grounds the injector circuit, power is passed across the injector solenoid terminals. All the injector grounds are spliced together on each bank of engine, and run into the computer. So, injector power, but no pulsing would seem a computer malfunction as long as the ground wires are good. Did you check all the injectors for pulse with the noid light, or at least both sides of engine?

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1 Answer

No injector pulse


what vehicle? injector pulse controlled by computer. the computer recieves a pulse from crank angle sensor, or distributor pick up, etc.
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1 Answer

Why does the fuel injector receive no pulse for 1998 ford explorer 4.0 motor


The 6 cyclinder motor has 6 fuel injectors. If your not getting pulse Electrical grond to an injector wire theirs a likly chance your not getting it at another. If your getting no pulse at all the engine won't run. Does the check engine light on with the engine running? What meadod did you determine that it had no pulse? Remove one injector wire one at a time with the engine running? If it's not running at all then the no pulse can be a common system part like the crank senser. Does the engine get spark? Most of the time pulse and spark are hand in hand so if the crank senser were bad it's not going to have s[ark either.

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2 Answers

Why would my truck shut down ,, and wait 15 min to cool off and be able to restart ,,and get warm again and shut down again


next time it duz it ... check for spark at the spark plugs eneyone will do .. allso check for pulse at the injector plug .... DO NOT USE A TEST LITE ...... if u don't have a injector noid lite use a meter ... if u no spark and no injector pulse the crank sencer is bad ..... if u have injector pulse and no spark .. the cink switch is bad maby shorting when warm .... happens a lot

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1 Answer

350 with TBI intermittent injector pulsing


this could be a bad ingnition module or a loose wire. but i think on this truck the injectors do get singnal from the ecm

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1 Answer

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you mean exhaust manifold?? how do you know its an injector problem???? how did you check this?? they either pulse or they dont......recheck all the work that was done.

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