Question about 1998 Dodge Ram 1500 4WD

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Turns on then shuts off

The truck turns on then cuts off i switched the fuel pump and tested the coil no go on either.

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  • pita168907 Nov 12, 2009

    nothing the truck has no anti theft my dad is stumped he has worked on older cars for over 20 years it is electrical we can kick ass in anything else but not electrical other then the simple things ie starter alternator battery fuel pump distributor relays fuses or bad connections no indications of it being a obd2 code found either

  • pita168907 Nov 12, 2009

    nothing the truck has no anti theft my dad is stumped he has worked on older cars for over 20 years it is electrical we can kick ass in anything else but not electrical other then the simple things ie starter alternator battery fuel pump distributor relays fuses or bad connections no indications of it being a obd2 code found either

  • chrsler tech May 11, 2010

    is the security light on or are the head lights flashing

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Heres somethings to check fuel pressure ing timing,tps senser or idle contorl valve vacuum leaks or broken lines.

Posted on Nov 12, 2009

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Is there by any chance some sort of security light flashing on the dash when this happends?

Posted on Nov 12, 2009

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1 Answer

Why am I not getting fuel


It depends on the make , model an year vehicle ! Most cars have relays or control modules that turn on the fuel pump ! You have to identify what you have an do some basic electrical test to see if your getting battery voltage to the fuel pump ! Some vehicles like ford have what is called an inertia fuel cut-off switch . If your in a accident this switch trips an shuts off the fuel pump ! To find out what system you have you can look at a wiring diagram for you vehicle !

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Inertia switch keeps cutting off while cranking engine


Power goes from the fuse box to the fuel pump relay to the inertia switch and then to the fuel pump motor.I would suggest bypassing the inertia switch for now just to see if you can get the vehicle started and go from there. FYI The inertia switch is just there in case you get in a collision and shuts fuel off. Good Luck

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No fuel pump noise... no fuel pressure. If the shut off fuel safety switch is not activated is there a by pass plug for testing fuel pump?


Is power coming into the fuel pump inertia switch (AKA fuel cut off switch) and going out? they get burned connectors, check that first. also the ignition switches also come apart in this year Ford, the switch is located near the base of the steering column and it operated by a long metal rod coming from the igntion lock cylinder. Remember when doing these tests that the fuel pump is only getting power for 1 second unless the engine starts or is cranking over.

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My car wont start


a) Do you have crank no start? (see entire write up)
b)No crank no start ,No dash lights?, ( battery, battery cables, ignition switch,,starter relay)

If you have symptom A then the affected items are , ignition switch, battery, battery cables, starter, starter relay ,coil, coil pack, ignition module ,Distributor cap ,rotor, (if applicable) spark plugs and wires.
The best thing to do is to first make sure your timing belt didn't break. As long as the engine cranks you can do this. Give the battery a 3 min charge . Then have a helper crank the vehicle while you observe the rotation of all the pulley's and belts. They must rotate together. If the vehicle has a distributor remove the cap, ground the coil wire and remove fuel pump relay ( to disconnect the pump for testing)and watch the rotor as the engine is cranked. it should spin. If this is a-ok your worse nightmare is over.
Now we have eliminated the timing belt as being a cause. We now have to charged the battery again for three min and load test it( this is best done by a repair shop a load tester is expensive .If the battery if more than 5yrs old you may want to replace it.
If battery does not pass load test replace it.
Whatever you decide the rest of the items can NOT be checked out without a fully charged battery.
Check ignition switch and starter relay for B+ going to them and leaving them. Check starter circuit. Make sure B+ is making it to starter ( use a digital voltmeter). If B+ (12 volts) is making it to the starter and it doesn't crank then the starter is defective. Verify this by removing the starter and have it bench tested.
If starter cranks now your into coil testing . First thing reconnect the distributor.
Pull a spark plug, hook it up to a spark tester and ground it, now crank the engine if you get spark coil is ok and in all likelihood so is module.
If you don't get spark test for spark at the coil wire.
If you get spark here and don't get it at the spark plug wire problem is at distributor cap , rotor or spark plug wire. If plugs look bad use a fresh plug to do testing and naturally replace them.
If all of the above are a-ok.
Next is fuel checks. Reinstall fuel pump relay
Easiest fuel check is to put key into ignition cylinder and turn to on position. Lister for pump to buzz or hum. if it doesn't then check fuel pump relay for B+ going to it and leaving it and going to the pump. If B+ making it to pump and it doesn't turn on the pump is your problem. If B+ not making it to pump either the relay or the ignition switch is defective.
Naturally if the pump is defective have a repair shop do the repair . Its dangerous and a real pain.
Good Luck
Now the cutting out after running fora whilrcoild have caused by the coil, ignition module, fuel pump.
We kinda have to get the car to start first to be conclusiveas to why it cuts out.

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Where is the fuel relay located in Mazda mx6 1988?


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2 Answers

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1 Answer

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The power supplied to the fuel pump, ignition coil, fuel injectors and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD):
The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, the logic module cuts power to the ASD, which in turn removes power from the fuel pump,ignition coil, injectors and those parts of the power module.  This causes the engine to shut down.

Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start. The ASD can be triggered by a broken wire or short in another place, e.g. the fuel pump.  Hope this helps, and did you try to retrieve any DTC codes?? Be glad to help friend.

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1 Answer

Where is the emergency fuel cut off switch located?


The neon don't have one, check the fuse and relay's. The fuel pump is also controlled by the Auto Shut down relay (ASD). The power supplied to the fuel pump. Ignition coil, fuel injectors, and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD). The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running  the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module.  This causes the engine to shut down. Good luck and hope this helps. 

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1 Answer

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1 Answer

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