Question about 2004 Chrysler Pacifica

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My 2004 chrysler pacifica idle surges when i accelerate between 2500 and 3000 rmp, could the plenium gasget be leaking

In the park position when idling very smoothly, when i try to revve the engine above 2.5 and 3 then the engine idle stumbles

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Idle fluctuations are usually caused by a vacuum leak.

Posted on May 08, 2015

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Your pacifica is supposed to do this
it insures the engine doesn't spin too fast and fail
without the force of the vehicle an engine can spin to fast and fail mechanically if someone floors the car in park or neutral so manufacturers put this feature in place to avoid such failures in the future

Posted on Mar 31, 2014

  • 3 more comments 
  • andru_p Mar 31, 2014

    disregard this until i can figure how to remove it, it is completly incorrect

  • andru_p Mar 31, 2014

    wait if this happens when driving disregard my solution,

  • andru_p Mar 31, 2014

    Add a Commentwhen the air plenum leaks it causes the engine to rev high due to the vacuum leak so i don't think that is it. if it only bogs down in park or neutral this is normal if it happens while driving it should trigger an error code you can get the code by turning your key from off to on 3 times and there should be a p code displayed by the odometer

  • Ml Howard
    Ml Howard Mar 31, 2014

    Is your CHECK ENGINE (or MIL) light on? If so then please let us know what the code is. You can find the code by geting in your vehicle and turning the key from off to on without starting the engine. You must do this 3 consecutive times to read the MIL code that will appear in the location where you vehicle mileage is displayed. IF YOU DO NOT HAVE A MIL CODE SHOW UP I would assum the car is functioning normally. Like the first poster said this is built in to the vehicle. If you are seeing these problems and the MIL light shows no code I would have Chrysler hook up their diagnostics system to find the trouble.

  • andru_p May 08, 2015

    the air plenum on the pacifica is plastic and known to leak, the egr inlet and butterfly valve actuator shaft. there is a youtube video showing a cheap fix, you can check where it's leaking by spraying carb cleaner around the plenum while the engine is running (do this while engine is still cold, you don't want to spray flammable chemicals on a hot engine)

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sandman357
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SOURCE: 2004 chrysler sebring idle speed is too slow. HOw

why do you want your rpms higher while idling? you don't want them high because your gas bill will reflect that. slow shouldn't matter but if it's dying while on idle it could either be your mass air flow sensor or your fuel filter being clogged

Posted on Mar 23, 2010

  • 1 Answer

SOURCE: 2004 Chrysler Pacifica Fluctuating Fuel Gauge Indicator

Hello, the answer to solve this problem is to take it to your nearest chrysler dealer and have them re-flash the updates to the ecu....since 2004, chrysler has had about 4-5 new updates since the date they were manufactured....you need to have the update that followed from your date of man. on your vehicle....They attempted to flash mine to the latest update and didnt work, turns out that they need the re-flash from back when...in order to get the gauage to stop fluctuating.....Hope this helps!!

Posted on Sep 21, 2009

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SOURCE: 2004 chrysler pacifica

It is for an oil change mainly and any other service your maintenance manual suggests at the mileage interval. It needs to be reset after each oil change to be accurate.

Posted on Jun 05, 2009

  • 1024 Answers

SOURCE: serpentine belt routing for 2004 chrysler pacifica

here it is

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Posted on Apr 13, 2010

  • 1 Answer

SOURCE: crankshaft position sensor location on 2004 chrystler pacifica

can u please tell me where on my 2004 chrysler pacifica is the crankshaft sensor located?

Posted on Apr 25, 2011

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1 Answer

After changing the water pump and timing belt on a 2005 Chrysler Pacifica 3.5 the engine will idle but surges when I accelerate. There is no codes being shown.


i'd advise rechecking the timing belt positioning again , surging can be a symptom of timing being out and i would'nt expect any codes if its the belt timing, as is set up manually and not monitored by the PCM

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Sometimes air in the coolant will cause an idle problem. Air will keep the air temp sensor from sending proper info.
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Crankshaft position sensor location on 2004 chrystler pacifica


can u please tell me where on my 2004 chrysler pacifica is the crankshaft sensor located?

May 02, 2009 | Chrysler Pacifica Cars & Trucks

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07 pacifica 3.8 eng. with 4 speed At low rpm's 1200 to 2000 it shudders and has a jerky feeling. It runs great at 70 mph at 2200 rpm and has good floor board acceleration . 4 dealers fail to acknowledge...


Well there is a rev limiter built into the pcm on your car. It is much lower rpm's in park and neutral. When u hit the rev limit of a particular gear selection, the pcm starts cutting out the injectors(fuel). This is normal. As far as the jerky feeling, the only thing I know of is a service bulletin that may apply to your car. It involves a revised torque converter for the transmission. It would only apply if your feeling this at speeds of approx 35 mph or higher when the torque converter lockup engages after a shift. Ask your dealer about a possible tsb for this if you think this may sound like your problem or search for tsb's(technical service bulletin's) yourself on the internet.

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