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1999 dodge ram runs rough in the morning and backfires. Does this occassionally other than in the morning as well? When it runs rough and backfires it has no power. Then after a few seconds it runs fine. New wires, fuel injectors clean, new spark plugs. Check engine light does not come on. Have had diagnostic test done and found nothing. It is hard to have the problem fixed when it does not happen all of the time. Any ideas would be helpful

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 512 Answers

SOURCE: 1999 Dodge Ram 1500 Extended Cab 4x4

idle air control motor on back of throttle body maybe malfunctioning and not allowing it to idle

Posted on Nov 09, 2008

ironhorse186
  • 4 Answers

SOURCE: 1999 Dodge Caravan running rough at idle and lack of acceleration

Here are a few things to check that aren't that exspencive to do. check you'r o2 scener and the map scencer.try tapping on the cadiletice convertor to see if can hear any rattling if there is any rattliling the cadiletice converter could be clogged and will need to be replaced.You can also have the emission control module tested to see if it working properly.

Posted on Feb 10, 2009

emissionwiz
  • 75797 Answers

SOURCE: P0306 code

Perhaps the compression guage u used has a defective schrader valve, if the compression was that low it would run bad, and mileage would not be 19 MPG. Glad to hear all is well.

Posted on Apr 28, 2009

  • 1 Answer

SOURCE: 1999 Dodge Ram 5.9L 4X4 not enough fuel

1999 Ram 1500 Van 5.2 L conversion vanI had same issue. No accelleration. Engine loses power under load, (throttle under 30% goes ok,  then when +30% it wheezes loads down like it is a diesel and starts to misfire) The van top speed dropped to 60 if you were on flat ground, and babied it. #0-45 going up any decent grade. Power slowly kept dropping over time, the engine lost vacuum under load, I had code for plug misfire, and just had no power under load. Lost transmission shifting points (and it started to sound a little funny too)  and heater vent controls would not work correctly when engine was under load.  Changed air filter, which had light oil discoloration on it.  No change  
Checked fuel pressure at 50 psi on rail ok Replace plugs, wires, coil and cap and rotor. No change Noticed dimming of hood courtesy light under load (voltage checked ok). Took off air filter, and reveved engine to where it lost power, I could see slight oil mist (or exhaust - fuel mix?) blowing up out of intake butterfly when the engine was acting poorly under load.  I had no smells from cat convertor. There seemed to be a good flow of exhaust out the pipe. Still I suspected plugged catalitic convertor. I beat on it with a rubber deadblow mallet and a little gray dust came out the exhaust. Took the van to exhaust shop and installed a new cat convertor.(also had to replace rust siezed O2 sensor).  On removal of the convertor, I was able to pour out a good amount of gray sandy debris (ash?) that was plugging the old convertor.  Now my van runs like it should.  Universal convertor installed for $180, sensor from auto parts store $66 I hope this helps you because I played with this for some time trying to figure it out.

Posted on May 17, 2009

wobin0588
  • 16 Answers

SOURCE: rough idle problem

IACV - Idle Air Control Valve can possibly be gritty or dirt ridden and needs to be cleaned can cause a rough idle, also the EGR Valve Exhaust Gas Release Valve could be bad or dirty, those are common problems on rough idle or stalled idle.

Posted on Jul 20, 2009

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1 Answer

Have a 2001 dodge ram quad 5.9 engine code reader says number 6 cyliner misfire.Engine runs rough and back fires till it warms up .When warm doesnt backfire but still runs rough .


First check the spark plug see if its firing or not. Check the plug wire with an ohms meter see if there is resistance if not replace plugwire.Check distributer cap replace if there white gunk on the terminals. One of these should help you. If not then its an internal engine problem like a blown head gasket or cracked head. Maybe a dropped valve or a hole in the piston. You need a compression gauge to check those things.If you have less than 150 pounds of compression id say its one of the last things on my list.Also it could be a lifter that is loosing its prime. My dodge caravan did this and it was a burned valve. I replaced it and it ran just fine afterwards. Hope this helps ya!! Have a great day

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