91 Dodge Dynasty no crank

Tiny
BLUEEYESPDC
  • 1991 DODGE DYNASTY
  • 6 CYL
  • FWD
  • AUTOMATIC

1991 dodge dynasty will turn over but not crank
have replaced starter battery ignition switch and key switch it starts and then stops within about 3 seconds

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Saturday, December 18th, 2010 AT 2:17 AM

22 Replies

Tiny
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Help me understand, the car actually starts and runs for three seconds and then shuts off?

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Monday, December 20th, 2010 AT 4:38 PM
Tiny
BLUEEYESPDC
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Itstart and will stay for a few seconds and then will stall. I replaced everythign I can think of could it be the computer?

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Wednesday, December 22nd, 2010 AT 4:24 AM
Tiny
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It could be but I doubt it, have you changed the idle air control valve? Have you tested fuel pressure?

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Wednesday, December 22nd, 2010 AT 8:06 PM
Tiny
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http://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Wednesday, December 22nd, 2010 AT 8:08 PM
Tiny
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Yes tested the fuel pressure and it was low compared to what the book says it should be. COuld it be the fuel pump going out or the regulator. I can hear the pump come on when I turn key and then I hear it go off when it dies? This one has me stumped?

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Wednesday, December 29th, 2010 AT 12:24 AM
Tiny
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It sounds like the pressure regulator, however, a dirty/clogged fuel filter will cause this too

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Thursday, December 30th, 2010 AT 7:44 PM
Tiny
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The fuel filter was replaced also.

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Thursday, December 30th, 2010 AT 7:50 PM
Tiny
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Ok so we can cross that out

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Thursday, December 30th, 2010 AT 7:55 PM
Tiny
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I dont really know what else to do can the computer be checked off the vehicle. We tried the thing to test the IAC valve and it is not moving in and out you can tell it is trying but just barely moves, we tried cleaning it but still no luck. Could it being bad cause the no crank issue? ALso we can smell gas when we try to crank it even though I dont touch the pedal?Help out of many and out of patience!

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Thursday, December 30th, 2010 AT 8:12 PM
Tiny
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BTW all this happened after replacing the starter and battery. I had it quit on me at store finally got it home and had starter tested and it was bad replaced it and battery. Drove to work that day and the next and then that afternoon went to leave work and would not crank has not cranked since. Had to have it towed home. Thought maybe a little background would help:)Thanks

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Thursday, December 30th, 2010 AT 8:46 PM
Tiny
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*that was out of money and patience:)

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Thursday, December 30th, 2010 AT 8:59 PM
Tiny
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I have replaced the pressure regulator with three different ones from a junkyard, not sure if they were any good though I know you cant tell by looking at them.

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Friday, December 31st, 2010 AT 3:00 PM
Tiny
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Ok, I dont think the computer is the case at this point. We need to test spark and make sure that it getting both spark and fuel, and by what your saying the iac is no good, that will cause it not to continue to idle once its started

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Friday, December 31st, 2010 AT 4:09 PM
Tiny
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Ok will try replacing it and will let you know. Thanks

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Friday, December 31st, 2010 AT 11:26 PM
Tiny
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Very good

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Saturday, January 1st, 2011 AT 8:27 PM
Tiny
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Well-replaced the IAC and still will not stay cranked. I dont know what else to do.

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Monday, January 3rd, 2011 AT 3:21 PM
Tiny
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Have they ever scanned for computer codes?

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Monday, January 3rd, 2011 AT 7:11 PM
Tiny
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Yeah I have checked it by turning the key three times and get nothing but 12 and 55 which I know is battery has been undone and end of codes?

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Monday, January 3rd, 2011 AT 7:24 PM
Tiny
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I have talked with a mechanic we know and he said somehting about checking pulse at the injectors what is that and what does that prove?Also when we checked the fuel pressure it jumped up to 48 and then quickly dropped down to 42 the pressure should be 48. Dont know if this means anything or not.

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Tuesday, January 4th, 2011 AT 11:32 PM
Tiny
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Pulse at the injectors mean, that you have to hook up what is called noid lights, they are little led lights that plug into the harnass of each injector, as the computer engergizes the injector, the light will illuminate instead of the injector spraying fuel. What it proves is, that the ecm is energizing the injectors appropriately, the fuel pressure dropping from 48 to 42 is normal.

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Wednesday, January 5th, 2011 AT 2:53 PM

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