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1999 Chrysler T&C misses/backfires when warm but not when cold

1999 Chrysler T&C. 3.8L Runs smoothly only until it warms up then misses and backfires. Threw a couple codes but only did so one time. OBD II said "Random Misses" and "Cyl 3 and 6 Missing." So I thought maybe the coil pack. Checked Coil Pack primary and secondary resistances (when cold) and they meet factory spec.

This problem started quite abruptly after filling up a very low gas tank but I'm not thinking it is related because of the warm vs cold and cyl pair 3/6 issues. Added some injector cleaner for the heck of it.

Took out the front 3 plugs and all 3 looked very clean. Can't get to the back 3 without taking apart 1/2 the engine or so it seems. WIsh it were easier to get at those bad boys!

Cleaned throttle body with spray cleaner. No improvement.

Air cleaner is very clean. Have not checked EGR or PCV yet.

Have not chenged Fuel Filter because of cold/warm difference in performance.

Thanks for any ideas!!!!!

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  • 7faux7 Jun 04, 2009

    SOLUTION FOUND!:

    Turned out to be a bad #6 plug wire. Wire tested at infinite ohms (once I could finally reach it). Amazing it fired at all but 50,000 volts will jump a gap that won't pass the DC current in a resistance test. I replaced all plugs and wires. Now running beautifully with much more power and better mpg!

    Also found the fan relay was shot so the radiator fans were not starting at all. No prob when driving on fwy but overheats if going slow. The solid state relay was $56 at Auto Zone.

    Total cost of all repair parts was about $125.

    This was not related to fuel quality.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: MISFIRE ON CYLINDER 5.

Same problem. 94 LHS 3.5L engine. Noticeable rythmic misfire at idle. Looks like cyl 5. When I pull the injector connector off of cyl 5 the idle rythm does not change. It does if i pull the inj connector off of any other cylinder. Spark OK. Injector ok using seperate 12vdc supply (clicks). Connector to injector has pulses on it verified with a test light. Inj coil resistanceis 12 ohms, exactly what it should be.

Still need to check compression and intake manifold gasket

websales@shaw.ca

Posted on Apr 20, 2009

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c17hydro
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SOURCE: REPLACEMENT of a fuel filter on a 1997

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The fuel filter (1) is mounted next to the fuel pump module (2), on top of the fuel tank (3)


The fuel delivery system uses quick-connect fittings. The fuel filter mounts to the top of the fuel tank.

  1. Properly relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Raise and safely support the vehicle.
  4. Place a drain pan underneath the fuel filter to catch any spilling fuel that will result from disconnecting the fuel lines.
It may be necessary to support the weight of the fuel tank with a block of wood and a floor jack. Once this is accomplished, loosen, but do not remove, the fuel tank strap bolts. Allow the fuel tank to lower just enough to access the fuel line fittings at the fuel pump module.

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Disengage the fuel line quick-connect fittings from the fuel pump module

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Be sure to place a drain pan underneath the filter line fittings to catch all fuel spillage

Locate the fuel filter in its mounting on top of the fuel tank. Detach the quick-connect fittings from the chassis fuel supply tube and fuel pump module by squeezing the quick-connect fitting retainer tabs together and pulling the fitting assembly away from the fuel line nipple. The retainer will remain on the fuel tube.

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Using a 10mm socket, remove the fuel filter mounting bolt ...

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... then remove the fuel filter from the top of the fuel tank

  1. Remove the fuel filter mounting bolt and remove the fuel filter from the fuel tank.
To install:
  1. Install the fuel filter on the top of the fuel tank and tighten the mounting bolt.
  2. The fuel supply tube (to chassis fuel line), return tube (to pump module) and fuel supply (to fuel filter) tube are permanently attached to the fuel filter. The quick-connect fitting ends of the fuel supply and return tubes are of different sizes.
  3. Apply a light coating of 30W engine oil to the nipples of the fuel filter.
  4. Push the quick-connect fitting over the fuel line until the retainer seats and clicks into place. Be sure the retainer tabs have locked into the case of the fitting.
  5. If necessary, raise the fuel tank and tighten the fuel tank strap bolts.
  6. Lower the vehicle. Start the engine and check for leaks.

Posted on Nov 30, 2009

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SOURCE: code p306 Chrysler 3.8 Engine, Help

Is Cylinder 6 have spark now or not?

Posted on May 26, 2010

  • 14036 Answers

SOURCE: 2002 Town & Country, 3.8l engine. I am

CHECK FUEL PRESSURE.IT SHOULD BE 53 - 63 PSI YOU COULD HAVE A BAD FUEL PRESSURE REGULATOR OR BAD MAP SENSOR.AC CLUTCH NOT WORKING.CHECK FUSE AND RELAY.IF ALL IS GOOD YOU HAVE LOW REFRIGERANT HAVE IT CHECKED.IF ALL IS GOOD AC COMPRESSOR CLUTCH OPEN OR COMPRESSOR FAULTY.THE INTERIOR TEMP GAUGE NOT WORKING COULD BE LOOSE WIRE OR ENGINE HAS A BAD OPEN COOLANT TEMPERATURE SENSOR.

Posted on Aug 21, 2010

motor1258
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SOURCE: 1999 Chrysler 300M, Dies on deceleration and at

For the price of a can of throttle body, spray cleaner, I'd remove the IAC motor , clean it, and port it came out of and try it and see what happens. It sure sounds like the same old dirty IAC problems that are frequent . Normally that will cure it, and if it does, but problem re-occurs later, replace the IAC motor. (IAC= Idle Air Control.) Regulates idle under load such as AC on, turning, braking etc, to step up idle to eliminate stalling when off the throttle.86cdd45.gif

Posted on Oct 15, 2010

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The Internet, though, has a large number of web sites where
you can buy service manuals and schematics from bookstores,
publishers, and other collectors. Here is just a sampling of
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Factory Automanuals
http://www.factoryautomanuals.com/
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http://www.chilton.cengage.com/

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Vintage Books
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