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2002 Chrysler Town and Country RPM fluctuates

Tiny
BUSYBOY
  • MEMBER
  • 2002 CHRYSLER TOWN AND COUNTRY
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 162,500 MILES
Hwy driving on cruise on level ground the rpm starts to fluctuate. The more I drove the worse it got. Got off hwy and car stalled at the light. Added injector cleaner to tank and w/i an hour the problem went away. A week later the same thing occurred again. Added cleaner to tank again and again the problem went away in about an hour. Now about a month later the same problem is back. RPM fluctuates on cruise and stalls at a stop light. I have already changed the fuel filter. Any ideas as to what is going on?
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Saturday, April 18th, 2015 AT 7:26 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Since the cleaner is helping, that leads me to believe the problem is within the fuel system. In this case, I would start by checking fuel pump pressure to see if the pump is weak or if there is a problem with the pressure regulator. That is what I recommend first, unless the check engine light is on.
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Saturday, April 18th, 2015 AT 8:20 PM
Tiny
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Check engine light is not on. But in the past winter there have been several times it did come on. After a while it would go off. Sometimes it would stay on for several days. When scanned the codes were always for a misfire.
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Sunday, April 19th, 2015 AT 1:08 PM
Tiny
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That could be the result of a weak pump. Start there and let me know what you find.
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Monday, April 20th, 2015 AT 8:36 AM
Tiny
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  • 4 POSTS
Thanks. The check engine light came on this morning and the code that came up is p0300 random cylinder misfire. I will check the fuel pressure as soon as I can. Weather not cooperating right now.
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Monday, April 20th, 2015 AT 9:12 AM
Tiny
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Sorry it has taken me so long to respond. Been real busy. Well, the fuel pressure is fine. Turns out the TSP was badand just not bad enough to generate a code. Replaced it and all the symptoms went away. Thanks
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Wednesday, July 22nd, 2015 AT 6:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Glad you got it fixed.
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Friday, July 24th, 2015 AT 9:06 PM

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