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My dodge ram when is at idle has a misfire - 1999 Dodge Ram

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Try so Seafoam from Autozone $10...pour 1/2 can into have tank of gas...drive 10 to 15 miles that should do it. also check plug wires for solid connections.

Posted on Sep 29, 2009

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SOURCE: 1997 dodge ram 1500 v6,i have a misfire,ive changed plugs,wires,distributor cap,rotor cap,fuel pump,rollover valve,coil,still has a miss

you can try changing the ignition coil, I own a 97 Dodge 1500 and mine did the same and thats what i had to do.

Posted on Oct 08, 2008

motor1258
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SOURCE: rough idle and misfire on ram truck

Change cam sensor & erase codes.( disconnect battery for a minute or so after.) 340 & 1391 refer to cam sensor problem, and all other 300 codes are cylinder misfires that should disappear when cam sensor fixed.

Posted on Jul 09, 2009

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SOURCE: 98 dodge ram 1500 5.9 multiple cyl misfire. cyl 1

did you check to verify that you have the wires in the correct order possible distributor pick up bad

Posted on Nov 12, 2009

  • 1509 Answers

SOURCE: 97 dodge ram stalls, and

Rams come with 3.9 V6 5.2 V8, and the 5.9 V8 The 5.2 and 5.9 have an intake gasket problem that the bottom of the upper phelm has a plate that blows the gasket.The gaskets cheap but the repair job takes all day but let's check to see if this is what happened to yours. Theirs a PCV valve connected to the valve cover and theirs a breather hose going from the other valve cover to the air claener hosing or hose. Remove both of these from the valve covers and temporany block the hole in the valve cover ( both) a peice of rag and jam the hose back on and fire the truck back up. if it runs alot better or even perfect you know the manifold bottom plate gasket blew. If your not handy trearing motors down for repair work it's best you hire the job done, I'm a pro and the fastest I've done it is 4 hours, and that's with all the right power tools and the parts store bringing me the parts and the front counter keeping peaple out of my way, and the experience of having done the work before. Lets say it's no help to block off the vacume leak into the crankcase. The check engine light is on and it's staying on. The Map senser measures manifold vacume and reports it to the computer, if it's got a broken vacume hose, a broken wire, or a bad senser ( in that order) the computer will have a MAP code in it and it'll run like you say. New map sensers cost a bit so don't just run out and get one, The coolant temperture senser can be bad and if it were to say to the computer that the engine is coldeder than it really is then it'll do what you say but again the check engine light will be on. A fuel injector can leak (most of the time if one injector leaks it's just a one cyclinder miss) the fuel pressure regulator can leak fuel into the intake and this leak will make it run good full throttle and load up and blck smoke only at idle. The gasket is the most likly cause and theirs service bulltins and most Dodge mechanics know about it.

Posted on Oct 14, 2010

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Check engine compression and compare. then test running engine compression most engines have about 130-170 cranking compression and about 90-110 running compression. OR bring that cylinder to its Top Dead Center compression stroke apply air to the cylinder and check to see where the air is going open throttle plate bad intake valve, from exhaust pipe bad exhaust valve, from oil cap piston rings.

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I have a 1999 ram 1500 5.2l starts up fine runs fine at idle but when you drive it has no power wont go past 30 mph. codes came up for misfire running rich did a tuneup on the truck still runs the same


Misfire could be any component in ignition system. Usually Coil On Plug or Coil Module.

A misfire will show as a rich condition,once sensed by the O2 Sensor.

No power could be Throttle Position Sensor or lack of Fuel Pressure,If NOT Ignition.

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I have a 2007 Dodge Ram 1500 with the 5.7 HEMI/MDS engine.If I shut the engine down when hot and then restart within a short time the idle goes up and down by about 100 RPM.It settles itself out after...


YOU COULD BE HAVING ENGINE MISFIRE.DUE TO BAD SPARK PLUGS AND WIRES.ALSO DIRTY FUEL INJECTORS WILL CAUSE ENGINE TO ROUGH IDLE OR IDLE UP AND DOWN.PUT A BOTTLE OF FUEL INJECTOR CLEAN IN A FULL TANK OF GAS.ALSO CHANGE PLUGS AND WIRES.IF TRUCK HAS 30000 TO 60000 MILES ON IT.THATS THE SCHEDULE MAINTENCE INTERVALS IF SPARK PLUGS HAS NOT BEEN CHANGED.

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1 Answer

Rough idle and misfire on ram truck


Change cam sensor & erase codes.( disconnect battery for a minute or so after.) 340 & 1391 refer to cam sensor problem, and all other 300 codes are cylinder misfires that should disappear when cam sensor fixed.

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1998 ram 1500 5.9 gas rough idle,hissing sound from air filter,missfires after each start for 2-3 minutes every time.if driving need tap gas pedal to make it run,on idle sometimes stalls,no dtc codes at...


SHOWING MISFIRES ON SCAN TOOL?IF NOT,ENGINE CONTROLLER HAS NOT LEARNED MISFIRE MONITOR..WILL HAVE TO BE DRIVEN A BIT FOR RELEARN..IF YOU CAN SEE MISFIRES..MISFIRING ON MORE THAN 1 OR ALL CYLINDERS?CHECK UNDERSIDE OF IGNITION COIL FOR CRACKS..IF NOT CRACKED,YOU MAY HAVE A FAULTY CRANK SENSOR..ANY CORRODED PLUG WIRES AT DISTRIBUTOR CAP?ALSO CHECK IF ANY OIL PRESENT IN INTAKE MANIFOLD..GASKET ON BOTTOM OF INTAKE MAY BE BROKEN CAUSING AN INTERNAL VACUUM LEAK

Jun 15, 2009 | 1998 Dodge Ram 1500 4WD

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