Question about 2002 Saturn VUE

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I checked the power of my fuel injector because that is what the computer reads out. it has power could it be a dead cylinder.

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Does the injector pulse (turn on and off) when the engine is running? u check this with a cheap little tool called a "NOID" injector tester.

Posted on Jun 26, 2009

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My fuel injectors are not spraying fuel. I have replaced fuel pump and fuel pump holder and fuses. Could it be a bad O2 sensor? I have a 1988 gmc s15 pickup truck.


SHOULD BE A FUSE FOR "INJ", THERE IS POWER TO ONE SIDE OF INJECTOR WITH KEY ON, THE COMPUTER GROUNDS THE OTHER SIDE TO OPEN INJECTOR. (THE COMPUTER DOES THIS IN MILLISECOND PULSES IF YOU GROUND ONE SIDE TO TEST INJECTOR IT WILL BURN UP INJECTOR, IF YOU HAVE NO POWER TO INJECTOR CHECK FOR CHIP IN KEY. USUALLY THE SECURITY LIGHT WILL BE FLASHING IF CHIP IS NOT READING. TINY WIRE AT KEY CYLINDER WILL BREAK FROM TURNING KEY.

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2004 Dodge Neon has fuel coming out of exhaust. Codes are 201, 203 and 300. Coil pack, plugs and wires all changed. Bad computer?


On the fuel injector cylinder number 1 and cylinder number 3, use a noid lite on electrical connector, see if lite pulses when you crank it? If there is a pulse then voltage and ground hopefully is ok.
With everything off, you use a digital multimeter on the ohms setting, hook leads up on fuel injector itself, check the readings on all the fuel injectors, see if the reading is close on all injectors especially compared to injectors one and three.
You could swap suspected fuel injector to another cylinder, see if problem follows the fuel injector.
I don't know what testing you have done? I hate to tell you to replace this or that w/o more info?

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Either has a bad injector or the wiring to that particular injector has been pinched or skinned and grounded somewhere.

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Power loss and slight juking


Figure if you are running with 7 cylinders firing instead of all 8 you will have a power loss and jerking from the dead cylinder.

You could have a bad injector which a Noide tester will show or a Voltmeter will show on the power wire to #7 injector. For testing the injector, check if it has continuity so if it does get power, it will work.

Usually the Code will show from the Spark circuit failing. Either the plug, coil on plug or wiring can cause the misfire. On some engines access to the plugs is easier. You could change plug 7 to another cylinder or change coil on top to different cylinder without removing the plug. Clear the computer and see if defect moves from one cylinder to another.

If cylinder 7 is still bad with a different coil, you have eliminated the coil as a problem. Then its either the plug or the wire to it.

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1 Answer

Dead cylinder number 2 bad injector number 2


use a digital volt meter,put it on the ohm scale check number 2 fuel injector should be 11 to 16 ohms if not reads zero fuel injector faulty.if numbe 2 fuel injector okay.use noid light hook it to fuel injector electrical connector with fuel injector disconnected and see if pcm is firing the fuel injector noid light should blink when cranking the engine.if light steady pcm not firing 2 fuel injector,if noid light dont light up.there is a open in the wiring connector 2 fuel injector 2. if fuel injector okay,check spark plug, carbon foul you have a bad ignition coil or wire if you see oil on spark plug you have worn piston ring or leaking valve guides allowing oil to foul out spark plug.do a compression test check compression to see condition of the cylinder.

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Mazda Eunos 500 - Engine lacks power - investigation reveals strong sparks on all cyls fuel at all cyls compression to specification on all cyls timing ok. Removing spark plug lead on cylinder one makes no...


You said compression is good then i would say you may have a bad coil , unless one coil runs all cylinders, but could still be a coil,,next thing i would check would be the injector make sure it gets a pulse if it does then try switching injectors from that cylinder to another cylinder and see if the weak cylinder changes with the injector change, if it does then you have a bad injector,

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92 ford probe with two cylinders dead one on each side. i do get spark, fuel, and compression. but i dont get fuel in the cylinder but the injectors are not clogged.


Check the pulse on the two injectors.Purchase a noid light at the parts store,that will fit the injector harness,see if the noid lights will flash,if they do,then replace the injectors,this would be the only thing it could be.If the noid light is not puling,or flashing,then the computer is the problem,seeing it is the distributor of the pulse on time.

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Misfire in #4. changed wires and both ignition coil still runs rough


Check the compression and Check for vacuum leaks at the intake manifold for the cylinder
Also the fuel injector can very likely be Dead, and alos make sure that the computer is actually controlling the injector for the dead cylinder, Dont just change parts have someone check the injector by an ohms (resistance) test or a current ramp test for the latter you will need an occilloscope

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