Question about 1999 Chrysler Town & Country
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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Posted on Jan 02, 2017
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
Posted on Apr 20, 2009
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.
Disengage the fuel line quick-connect fittings from the fuel pump module
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.
Using a 10mm socket, remove the fuel filter mounting bolt ...
... then remove the fuel filter from the top of the fuel tank
Posted on Nov 30, 2009
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
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.
Posted on Oct 15, 2010
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