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louieg Posted on Oct 17, 2015
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Car has spark power and fuel just no pulse to injector what do you do to repair

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Stephen

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  • Mercury Master 21,873 Answers
  • Posted on Oct 17, 2015
 Stephen
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You may need a shop manual.
The injector pulse comes from the engine computer, and the computer gets signals from several sources.

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Do you have spark and fuel pressure? Check the inertia switch? You might try a spray of starting fluid. If it tries to start you would know that the engine has spark, but the injectors could be working without fuel pressure and starting fluid would show you it is a fuel pressure problem if the engine fires with starting fluid.
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Fitted cranksensor injector loom still not starting ?

You would put on a new crank sensor because the ignition system won't work, it gives no spark. So now do you have spark at a spark plug wire end? A blue consistent spark? Probably good ignition system, as long as all spark plugs get a spark.

One thing you always want to check with no start is the fuel pressure. Turning the key to on should turn the fuel pump on and put pressure in the fuel rail at the engine. Autozone and maybe others rent or loan fuel pressure gauges. Multi-port injection systems have high pressure specifications, around 40 psi normally. That is what the injectors require to spray out fuel when they pulse and open the nozzles.

With the injector circuit, the first thing to check is if each injector has power to it with the key in ON. One power wire and one ground wire goes to each injector. The power wire is from a fuse that is powered with key on or key in start, and then it is spliced to all of the injectors. The injector grounds all run into the engine computer, where the circuit can be internally grounded for a split second and cause the injector to pulse. But anytime the key is on, the injectors have steady voltage available to them.
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If ECU has crank signal and engine turns over, ECU should give injectors a pulse and trigger the ignition. If not ECU might be bad. You should check power and grounds going to ECU. There are usually multiple power and grounds going into ECU

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

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No power to injectors

If your spark is good and no injectors pulse then the stator has failed.The stator is in the distributor and is reponsible for injector pulse,you said you have spark and fuel pressure, and no injector the stator in the distributor is your solution,Now if the injector has no power thats totaly different, The power is fused
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