Will not stay running

Tiny
USTOGETHER04LIFE
  • MEMBER
  • 1996 DODGE CARAVAN
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Okay, it will start and run but for only about twenty to thirty seconds and then it will shut off slowly if you Pat the gas. But will shut off immediately if you don't pat the gas. Let it set for a hour or so and it will repeat this process.


I have changed:

The fuel pump.
Fuel filter.
Crankshaft sensor.
Camshaft sensor.
Ignition coil.
And I've checked fuel pressure all are okay.

From what I can tell it's only firing every third time through the firing cycle or something like that.
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Sunday, February 10th, 2019 AT 3:11 PM

19 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

I suspect you have a fuel delivery issue. You need to check the actual fuel pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

You can rent a tester at a parts store to verify a fuel pump failure.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy
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Sunday, February 10th, 2019 AT 3:32 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
  • 1988 DODGE CARAVAN
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 183,000 MILES
Well it will crank and fire up, and will take gas and run perfect for about twenty to thirty seconds. Maybe a minute, but it will soon shutter and shut off. But I have found out after doing this several times. That if you just let it run without touching the gas. It will just shut off real quick. But if you pat the gas while it is shutting off it will act like it's going to pick back up. But after sputtering up and down from a good idle to about to shut off it will go head and shut off.

So, I thought fuel pump so I changed it and still the same.

So then I went to the firing and found out that I wasn't getting no fire threw the ignition coil. So I changed it and it started get fire but it wasn't right. It would only fire about one time on the number one spark plug wire for about every six to eight times it would turn the engine over.

So then I changed the crankshaft sensor.
Still the same.
So I changed the camshaft sensor and still no change.

And I've checked the fuel pressure.
And the fuel filter.
And air filter.

And I do not know if this may help but it has a knocking sound when you let it idle or when you let off the gas and it gets about down to 20-30 mph and stops when you get to about 5 mph. The noise sounds like it is the dust cover on the catalytic converter but it is not.
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Monday, February 11th, 2019 AT 1:47 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using 2CarPros.

Are you sure the internal components in the catalytic converter are loose and plugging the exhaust?

Do me a favor. Do this test and see if makes a difference.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Let me know what you find.

Joe
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Monday, February 11th, 2019 AT 1:47 PM (Merged)
Tiny
USTOGETHER04LIFE
  • MEMBER
Okay, I'll sure try it and here is a video:
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Monday, February 11th, 2019 AT 1:47 PM (Merged)
Tiny
USTOGETHER04LIFE
  • MEMBER
Okay, it seems to run a lot different from what I can tell. I only let it run for a few maybe minute or two and then it went dead but it fired back up and ran for another 30 45 seconds and shut off again. Then it would start but only stay going for a half a second or two.
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Tuesday, February 12th, 2019 AT 3:44 PM
Tiny
ASEMASTER6371
  • EXPERT
Did you disconnect the catalytic converter? Joe has a point that the cat converter may be clogged.

If you disconnect it, see if it continues to run.

Roy
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Tuesday, February 12th, 2019 AT 3:46 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
Yes that's what I did.
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Tuesday, February 12th, 2019 AT 3:51 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
Might just because it unhooked and all, I do not know.
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Tuesday, February 12th, 2019 AT 3:53 PM
Tiny
ASEMASTER6371
  • EXPERT
No, not at all.

Can you check the fuel pressure with a gauge to be sure the pressure is not going away?

Roy
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Tuesday, February 12th, 2019 AT 3:57 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
Yes, I did it and it had good pressure.
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Tuesday, February 12th, 2019 AT 4:02 PM
Tiny
ASEMASTER6371
  • EXPERT
What is the exact pressure and does it stay when it stalls or does it fall away?

Roy
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Tuesday, February 12th, 2019 AT 4:05 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
A little over 50 psi.
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Tuesday, February 12th, 2019 AT 4:23 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, good.

Did the pressure stay the same when it stalled? Trying to see if it is losing voltage to the pump.

Roy
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Tuesday, February 12th, 2019 AT 4:26 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
I do not know. I didn't really pay attention when it stalled when I tested it.
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Tuesday, February 12th, 2019 AT 4:30 PM
Tiny
ASEMASTER6371
  • EXPERT
Test it again and see if the pressure drops off and it stalls.

Roy
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Tuesday, February 12th, 2019 AT 4:32 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
Okay, I understand I think. So look for a pressure drop when it stalling out but still running a little.
Even if it's stalling out it should still keep that same pressure until it's totally dead.
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Tuesday, February 12th, 2019 AT 4:39 PM
Tiny
ASEMASTER6371
  • EXPERT
Yes, it should stay constant if the key is on.

If it drops, there is something turning off the voltage such as the ASD relay.

If it does not then we need to look toward loss of spark.

Roy
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Tuesday, February 12th, 2019 AT 4:44 PM
Tiny
USTOGETHER04LIFE
  • MEMBER
Okay, I'll check it. I do not know about tonight but maybe tomorrow night after work.
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Tuesday, February 12th, 2019 AT 4:59 PM
Tiny
ASEMASTER6371
  • EXPERT
Sounds like a plan.

Roy
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Tuesday, February 12th, 2019 AT 5:03 PM

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