Question about 1998 Dodge Dakota

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92 dakota 3.9 won't fire

I've replaced the crankshaft position sensor, ignition coil, distributor cap and rotor as well as the fuel pump assembly (which was originally what was the problem..but now the fuel gauge stopped working grrrr). It acts like it wants to fire but just won't start. any ideas would be appreciated,

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  • Dodge Master
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Replace ignition control module,may be built in to computer

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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NO FIRE AGAIN


Make sure fuel pump is getting power. Im not sure but I think ignition is wired through fuel pump so if it dont pump fuel it wont spark either

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Truck wont crank. we have put new distributor cap, rotor button, coil pack, plugs, wires, and fuel pump. we also checked our firing order.


you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.

Apr 17, 2011 | 1996 Chevrolet K1500

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Truck was idlilg and then died,has not started since.battery is strong,new fuel pump,starter spins strongly and motor does not make any unordinary sounds.never had problems before.Are there any fuses or...


Check for spark and gas.

Add a little gas to the throttle body or carb. inlet and see if it fires up. If it does, then the ignition is ok and the fuel pump circuit may be bad.

If it doesn't the ignition system may be the problem.

The following may aid in understanding the ignition side of things:

ELECTRONIC IGNITION Description and Operation NOTE: All models utilize a crank angle sensor in the distributor. This sensor is used to provide engine position information to the Electronic Control Unit (ECU). The ECU regulates ignition timing electronically, therefore no vacuum or centrifugal advance is used. Also, because of the ECU control, no periodic service adjustments are necessary. However, if timing or idle speed problems are suspected a combined ignition timing and idle speed inspection procedure is provided. Fig. 1: Distributor assembly with crank angle sensor - note the retaining screws 86712013.gif
The only major component in the electronic ignition distributor assembly is the crank angle sensor. It is basically a rotor plate wheel with 360 slits, one per degree of crankshaft rotation. A Light Emitting Diode (LED) is mounted above the slits and a photo diode is below. As each **** uncovers the LED, the photo diode detects the signal and reports to the ECU. A second LED/photo diode pair is mounted inboard of the 1 degree set to read slits indicating Top Dead Center (TDC) of each cylinder, with a special signal for the No. 1 cylinder. On all engines, the assembly is in the distributor (retained by 2 screws), just below the rotor. Fig. 2: Power transistor and ignition coil 86712014.gif
Fig. 3: Crank angle sensor components 86712015.gif
The ECU sends an ignition signal to a power transistor, which turns the coil primary circuit on and off. The primary circuit current is amplified by a resistor. The ignition system is a standard configuration: one power transistor firing one ignition coil, which sends the high voltage to the distributor cap. prev.gif next.gif

Oct 13, 2010 | 1994 Nissan Pickup

1 Answer

No fire


Hello, first of all let's explain how the spark gets to the plugs. There is a crankshaft position sensor and a cam sensor. They are what determines when to fire the coils and injectors. The crank sensor is located on the passenger side on top of the bellhousing, the cam sensor is the pickup plate in the distributor. As the engin turns the send refernece pulses to the computer which grounds and ungrounds the ignition coil causing it to discharge and send voltager from the secondary coil wire to the center tower in the distributor cap. The rotor button recieves the voltage and distributes it to the 6 towers (1 for each cylinder) If you say you're getting spark from the rotor that tells me the primary side of the ignition system is working, and the secondary side is working into the distributor cap. I'd check for spark out of the plug wires at the plugs. Pull a wire and insert a #2 phillips screwdriver into it, hol the shaft of the screwdriver aprox 1/8"(no more) from the exaust manifold and observe the spark as someone turns over the engine. You should see a nice blue spark. If theres spark, spray a little gum cutter in the throttle body an crank it, if it fires you have a fuel problem. Install a fuel pressure gauge on the schrader valve on the fuel rail and observe it as you crank it. If theres no fuel pressure maks sure there's fuel in the tank, if so climb underneath and beat on the bottom of the tank with a rubber hammer, the pump may be going bad, sometimes you can jar them and make them run.

Thanks

Aug 17, 2010 | 1993 Dodge Dakota

2 Answers

I have a 1991 s10 blazer it has no fire from the coil i have replaced both the coil and the module anad still no fire it has voltige at the coil


Sound like you have a bad distributor pick up assembly, the distributor assembly pick up coil is what breaks down the voltage at ignition coil to give it spark, distributor will need to come out to replace pick up coil, mark your distributor rotor so when reinstalling you install at same position.

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5 Answers

1995 dodge dakota 2wd 3.9 no spark to plugs,or coil,orfuelpump


First of all let's explain how the spark gets to the plugs. There is a crankshaft position sensor and a cam sensor. They are what determines when to fire the coils and injectors. The crank sensor is located on the passenger side on top of the bellhousing, the cam sensor is the pickup plate in the distributor. As the engin turns the send refernece pulses to the computer which grounds and ungrounds the ignition coil causing it to discharge and send voltager from the secondary coil wire to the center tower in the distributor cap. The rotor button recieves the voltage and distributes it to the 6 towers (1 for each cylinder) If you say you're getting spark from the rotor that tells me the primary side of the ignition system is working, and the secondary side is working into the distributor cap. I'd check for spark out of the plug wires at the plugs. Pull a wire and insert a #2 phillips screwdriver into it, hol the shaft of the screwdriver aprox 1/8"(no more) from the exaust manifold and observe the spark as someone turns over the engine. You should see a nice blue spark. If theres spark, spray a little gum cutter in the throttle body an crank it, if it fires you have a fuel problem. Install a fuel pressure gauge on the schrader valve on the fuel rail and observe it as you crank it. If theres no fuel pressure maks sure there's fuel in the tank, if so climb underneath and beat on the bottom of the tank with a rubber hammer, the pump may be going bad, sometimes you can jar them and make them run.

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1 Answer

1994Dodge Dakota Wont start changed distributor cap rotor,coil, fuel pump, no spark wont start


could be a bad crankshaft position sensor or a bad camshaft position sensor. Either would cause no spark. I would check to see that you have fuel coming up to the throttle body

Jun 06, 2009 | 1994 Dodge Dakota Club Cab

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