Question about 1998 Dodge Ram 1500 4WD

2 Answers

P0171 code and P0301 misfire.

Replaced both O2's, replaced plugs, wires, cap and rotor. Replaced injectors, checked for vacume leaks, checked for intake leaks. Replaced throdle control module. Still getting P0171 code and misfire codes and truck runs for a couple days , then like a light switch the check engine light goes on gives me a list of codes,and runs like ****. Truck won't go 1/2 mile down the road, top speed is about 20 and thats down hill. Next going to replace MAP sensor. After that I'm gonna find a cliff and a brick!!! Any help I would REALLY appreciate it! Thanks!!

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  • bobcin24 Apr 15, 2009

    It's a 318, 5.2 4X4 1/2ton

  • bobcin24 Apr 15, 2009

    Yes put fuel presure test gaugw on it several times. got 49lbs solid

  • bobcin24 Apr 15, 2009

    Sometime I get a P0300- random misfire code. It does it all of a sudden it will run fine a couple times then like I mentioned its like flippin a switch and the codes come up. usually its a P0302 but Sunday it gave me a P0301 and a P0307 and the P0171.

  • bobcin24 Apr 16, 2009

    No on the TP sensor. Was gonna try that next alog with the MAP sensor. Have been told Dodges usually never have trouble with them. Did fuel test when it was runnin bad was at 49lbs. Exhaust is ok have duels on it. 2 3/4" pipes all the way to rear. Not sure how to test TP? I have a Chilton manual here to look at if its to involved for you to explain and is the way you would do it. Had converter replaced 2005 on my way florida. The reason I need to do this myself is I don't trust the dealer thats around me. They are crooks and know nothing. They also charge 94.00 an hour to look at it!

  • bobcin24 Apr 16, 2009

    Engine will run if the plug is off the sensor? Or just have the key on?

  • bobcin24 Apr 16, 2009

    Sorry found info in the book. I will check it now and see if i can get a reading. Have to have ign in on position then see if voltage goes up and down.

  • bobcin24 Apr 16, 2009

    I tried the volt meter. Got 4.5v going into the sensor. Checked the voltage on the other post and in stays at 4.5v across the closed and wide open positions. Is that right? Book says it should go from .6v to 4.5v. Is the sensor good or bad?

  • bobcin24 Apr 21, 2009

    Hey motor1258. Thank You for all your help. I've narrowed my problem down to a short in the fuel injector wire. I spend the last 4 days replacin the water pump and the timing chain and gears. Chain had lot of back lash, so to avoid it breaking i replaced it. Got it back running yesterday. Runs better and still have a P0302 code. I swapped the injectors #2 and #4 and still got P0302 code. My book said it might be a short in the wire to the injector since its workin in the #4 cyl. I replaced the coil befor i started doing all the work. Think the short might be the remaining problem? I hope it does! 66polara.

  • Mike Butler
    Mike Butler May 11, 2010

    Been there before, not that dealer, but must have been related. ha-ha. If you just pull connector of TP sensor, and put ohmmeter on 2 of the terminals on the pins/spades of the sensor (not 100% which on yours but a little trial & error & you'll find them) . Have someone push gas pedal down, slow & steady, and ohmmeter should go up & down with it. If reading jumps all over, or drops off suddenly, that's a sign of a faulty sensor (potentiometer)

  • Mike Butler
    Mike Butler May 11, 2010

    Pickin some brains, hopefully they'll turn up something, or recall similar experience. Did you test TP sensor just to see?

  • Mike Butler
    Mike Butler May 11, 2010

    Have you tried an ohmeter/voltmeter on the TP sensor. Are you aware of how to test it that way? How's exhaust flow? With multiple misfires & lean mixture codes, you have to think it's starving for fuel. When it dies out, does it start back up & run good if you let it sit for 15-20 minutes?

  • Mike Butler
    Mike Butler May 11, 2010

    After you erase them, Always same 2 codes or are their more?

  • Mike Butler
    Mike Butler May 11, 2010

    Have you had fuel pressure tested when it's running bad? Notice any similarities in weather (temperature) or fuel level in tank when it happens?

  • Mike Butler
    Mike Butler May 11, 2010

    What engine?

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  • 3 Answers

I have a similar problem. I'm replacing the fuel pump and might get an aftermarket coil. The coil on my 5.2L Dakota is right behind the radiator on the front right side of the engine. Stupid spot! I'm surprised it hasn't melted!

Posted on Jun 16, 2009

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  • Dodge Master
  • 6,674 Answers

Sorry I had company show up & couldn't get back until this am.
On yours, you leave connector on at TPS, and with key on, not running, use voltmeter at center terminal. At idle it should read more than 200MV. At wide open throttle (WOT) should be less than 4.8 volts. Also should increase gradually as you open throttle, any drop off, or large fluctuation indicates problem, as long as your smooth doing it. If not within these voltages, or jumps up & down, drops off, replace it. You still should be able to do same with ohmmeter & harness disconnected, and connected at 2 of the pins at sensor. (it's a potentiometer) Increase & decrease same rules & smooth. If doesn't work at one set of pins try different combinations, or ground & one pin.One way or another you should find the right combination to get a reading in ohms.

Posted on Apr 16, 2009

  • Mike Butler
    Mike Butler Apr 18, 2009

    Something I found on this site. Check spark at coil. If yellow/orange color and 1/4" or so long, replace coil. Spark should be 1" or more & nice blue color. Owner was having same similar thing as you.

  • Mike Butler
    Mike Butler Apr 21, 2009

    you never know when a little gremlin is going to cause you headaches eh ? here's to hoping your fixed & running fine soon.

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