Question about 1992 Ford Taurus

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What do you do when injectors are not working but getting gas to them.

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  • yadayada
    yadayada Sep 02, 2010

    is the red wire to each injector hot (12 volts present) when the key is turned on?

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I'd ask how do you know the injectors are not working? But if you have tested them or inspected there's only one way to fix and that's to replace but don't spend the money if you're just guessing. Many things will cause a car not to start or run. Check for spark on each wire. If has fuel and has spark then I'd check sensors. A bad sensor will keep car from starting or stall and especially if it's shorting the computer with high voltage on the signal line.

Posted on Sep 02, 2010

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Check under hood for bad fuse or relay pertaining to the fuel system. retrieve trouble code(s) from vehichle computer.

Posted on Sep 02, 2010

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1 Answer

Late start after head service and injector replacement, already code the injector. it will just start and stop for few crank. n finally start


Hi Ashneel

Sounds like you've had head (gasket) service, and replaced the injector(s), and are getting more injector codes. If you have a code reader (they're pretty cheap on eBay), you can get more particulars. However, you're getting an injector code with a new injector? I'd then suspect:
  1. The fuel system upstream of the injector.
  2. The electronics connecting to the injector.

Hopefully there would have been some basic tune-up work done in conjunction with the head and injector work, but...
  • If the fuel filter hasn't been replaced recently, consider replacing it. A clogged filter can starve the injector for enough gas to inject.
  • How old is the fuel pump? It clearly is working, but if it's on it's last legs and not pumping like it ought to be, again you can be starved for fuel.
  • Have you refilled your gas since the work? It's possible you got batch of suspect gas. You might consider dumping a bottle of Octane boost in to see if things run better (or well enough to burn off the old gas).
  • Your electronic ignition system (or distributor if the vehicle is of that era) controls the coordination of fuel, spark, and crankshaft position. Check the wiring to the injectors at both ends to make sure there's not a loose connection or cable patch. Check the fuse and or relay for the fuel pump and EIS.
It's also possible that fuel is a red herring, and you might have a really dirty air filter, or fouled/poorly connected spark plugs.

Hoping this helps you narrow it down!
D

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Are they getting gas?... if so bad injectors maybe clogged
If no pressure to fuel rail then clogged fuel filter or bad fuel pump

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check all fuses under left dash if that doesn't work check to c if you are getting power on the injector plugs if you are getting power then go to a junk yard and get a throttle body

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When you say ,,, gas goes by one injector..... this means to me that a cylinder is getting flooded with gas. If this is true.... and you know for a fact that the injectors is good.... the problem has to be electrical. The injectors have power all the time and the PCM grounds the injectors to turn them on. If in fact the injectors are good and gas is still getting into the cylinder then there can only be 2 things that cause this... one... the PCM is defective and keeping the injector on ..on that cylinder... or two... the ground wire to the injector is shorted to ground somewhere. These are the only two things that will cause the injector to stay on. Be sure the injector is good !!

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1 Answer

I changed the fuel pump,im getting gas to the fuel rail but none to the injectors


If gas is getting to the fuel rail, it is getting to injectors. If fuel pressure is good, probably the injector circuit is not working. With a test light you can check the injector circuit. Post back for further help. What year and make is the car?

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Question:
Explain Triggering!

Fuel injectors do either one of three things:
1) Clogged - fail to pass gas through them when a voltage triggers them to fire/spay gas.
2) Electrical connection breaks inside the injector - 'throw it away and get a new one'
3) Signal being sent to the injector isn't being sent.
Swap a good known working injector with the suspected bad one. See if there is a change!
NOTE: Many times when the car is on and standing still idling, removing (a or 1) of the fuel Injector's electrical connection from it interrupts how smooth the engine idles.
If no idle interuption - injector isn't working at all
if a slight idle interuption - injector is working fine
if a major idle interuption - possilbe there are other injector's that aren't working either.
Blessings,
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CHECK THE FUEL INJECTORS FUSE.IF ALL GOOD.SCAN TO SEE IF CRANKSHAFT SENSOR WORKING AND CAM SENSOR WORKING.THEY CONTROL INJECTORS AND ENGINE TIMING.IF THEY GOOD.YOUR INJECTORS CONNECTORS HAVE ELECTRICAL PROBLEMS.

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If this don't work try checking you injectors again then check to see if your getting enough gas? Pump the gas peddle then go to the hood and see if you smell gas? if not? it your fuel pump orFuel Filter, and or lines clogged up. If your getting gas up to the front of the motor then it in your injectors? it one or all.

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