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No spark in 94 dodge ram 1500

All fuses good plugs and wires under 6 months old new coil pack . when i try to start the truck i get only a short burst of power to the coil pack and no spark at all.i even put a test light on the coil pack it self ( got nothing)

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  • yadayada
    yadayada May 11, 2010

    what is the fuel pressure?

  • scaletech May 11, 2010

    Have you pulled the auto shut down relay and tried say the fuel pump relay in its place? If you have the fuel pump run when you first turn on the ignition switch without starting then the relay is probably good if it only runs for say a second and stops then it is probably bad. If that is not it I would look at the crankshaft position sensor, the PCM may not see the motor turning and kill the output to the coil.

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6 Suggested Answers

Mike258
  • 1498 Answers

SOURCE: 94 dodge ram pickup 1500 v-6

Hi there,

Many dodge models actually have two o2 sensors. I'm not sure if this applies to your model. If so, one is on or just downstream of the exhaust manifold. The other on the outlet pipe of the catalytic converter.

The PCM compares the readings and adjusts the fuel/air mix to keep the catalytic converter operating at max efficiency.

A malfunction in any portion of this sub-system could cause your symptoms. So let's run a test on the o2 sensor(s).

  • You'll need an Ohm Meter.
  • Be careful when doing this. If the lead wires on the sensors are damaged, the sensor will likely malfunction. Locate and pull the electrical connector from the o2 sensor.
  • Attach Ohm Meter leads to the terminals.
  • It should read 5 to 7 Ohms
  • If not, replace them
Keep in mind, these symptoms could also be caused by many other things.
  • Timing
  • Vacuum leaks
  • Bad gas
  • Clogged catalytic converter
  • Cracked/bad distributor
  • Plug wires shorting against one another
  • Weak spark
  • Rich Air/Fuel mix
If your vehicle has OBD (On Board Diagnostics), you can narrow down the problem by checking for trouble codes.

To do this manually, get a pad, a pen, your keys and get in your truck.
(the procedure for entering diagnostics may vary, but this works for the dodges I've worked on)
  • What to expect: On your dash there is a CHECK ENGINE or MALFUNCTION light. It will blink to signify the digits of any error codes. The codes have two digits with a pause between them. Blink-Pause-Blink-Blink would signify a 12.
  • To enter diagnostics: Turn the ignition ON-OFF-ON-OFF-ON (within 5 seconds)
  • The codes will begin to flash
  • Write them down.
Of course, its easier to go to an auto parts store that offers code reading service.

Question: Of all the possible causes, why did the o2 sensors get picked as the cause? Is there more to the story?

Any way, run the tests, perform the diagnostics and get back with me, we can go from there.

Hope this helps

Mike


Posted on Jul 29, 2008

  • 2 Answers

SOURCE: 1997 dodge ram 1500 v6,i have a misfire,ive changed plugs,wires,distributor cap,rotor cap,fuel pump,rollover valve,coil,still has a miss

you can try changing the ignition coil, I own a 97 Dodge 1500 and mine did the same and thats what i had to do.

Posted on Oct 08, 2008

emissionwiz
  • 60792 Answers

SOURCE: 1997 Dodge Ram 1500 transmission will a 1996 interchange

No, the frame is different.

Posted on Nov 30, 2008

  • 512 Answers

SOURCE: 2001 dodge ram 1500 v8 spark plug wire diagram

the firing order is 1 8 4 3 6 5 7 2 clockwise around the cap

Posted on Jan 03, 2009

  • 218 Answers

SOURCE: 94 dodge ram 1500 5.2 replaced fuel pump still no

U NEED TO CHECK THE FUEL PUMP AND AURO SHUT DOWN RELAY.THEY ARE IN THE UNDERHOOD FUES & RELAY CENTER.U CAN SWITCH THEM 1 AT A TIME WITH A/C RELAY.IF THAT DOES NOT WORK U MAY HAVE A PROBLEM WITH THE PCM

Posted on May 13, 2009

  • 1 Answer

SOURCE: 2001 Dodge Ram 1500; how to reset computer after replacing dead battery

how do u reset after replaceing fuel pump to get radio and things back to work man told us we couldnt reset because fuel pump was bad

Posted on Aug 22, 2010

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