Question about 1999 Dodge Ram

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Check engine light came on the computer said misfire on number 2 and number 7. I installed new plugs and wires. The check engine light went off but it still seems to be missing and idling rough. When you drive and get up to speed the truck feels fine but when you go to stop it misses hard

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Missing at idle and good at highway speeds typically means either leaking injectors, vacuum leak and/or base engine concerns

I'd start with the injectors

Posted on May 16, 2010

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Rough idle, acceleration and check engine light went from being on to flashing on and off


Use a ODB-2 meter to read the problem code. That will give you a clue on what to look for next.

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Engine light on. went to auto parts store, they diagnosed number 2 or 3 cylinder not firing. prior to this i changed plugs and wires. then i changed the coil. the engine light went off and the gas economy...


Hello mikew564.The first diagnosis was number 2 or 3 cylinder not firing. Once you changed the coil, the check engine light went off. When the light came back on again, did you get it diagnosed again to find out if the problem was the same?... 2 or 3 cylinder not firing????

First of all, there is NO extra wire/ground on the coil/ignition wiring (see images below). The spark plugs and ignition plug wiring can be checked for arcing, corrosion, resistance and can be checked for cracks in the insulators or worn electrodes (and spark gap) by a competent mechanic.
If you are having the same issue (2 - 3 misfire), there are several techniques for eliminating the plug wires or spark plugs. Spray water on the plug wires to see if they are arcing. Swap plugs from cylinders 2 & 3 with cylinders 1 & 4. If you still have a 2-3 misfire, check/inspect/examine the coil connector pins & coil harness to the coil(s) themselves.

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I have a 2001 Jeep Grand Cherokee with a 6 cyl engine. While driving Saturday afternoon it suddenly started shaking and the check engine light started flashing. After a few minutes the light became steady,...


Even though the plugs are "new" it can get fouled out. Soon as you put in a new set, one could go bad on start up. The plug wire could have hit a hot surface and burned into the insulation causing a spark jump. You can check the wire by holding a screwdriver in the spark plug end and holding it 1/4' from a metal surface. Have someone to turn the engine over to see if you have a nice blue looking spark jumping from the screwdriver to the metal. Also, at night start the engine and look under the hood for any sparks jumping from the area. you could also have a misfiring injector but I would put that at the end of list.

I would check for jumping sparks first, then install a new plug in #2. Right now you would only be out of $2 for the plug.

Apr 11, 2011 | 2001 Jeep Grand Cherokee

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Went through some water van died after sitting a day it started up but engine light is now on and sputters when stopped went to auto zone they say i have a 2 cylinder misfire what excactly does this mean...


It means that the number 2 cylinder (passenger front of the engine) is not working. Whether its spark, fuel, or mechanical. The first thing you can check is if there is spark to the cylinder. With the engine running remove the spark plug wire from the number 2 spark plug. Listen or look for spark out of the plug wire. If there isn't than you can check for spark out of the coil pack. Do this with a test light or spark tester. With the engine off remove the number 2 spark plug wire from the coil pack. With the spark tester installed or the test light hooked to ground and placed on the #2 coil post have some body crank the engine over. If ther4e is no spark that you might have a bad coil pack. If there is spark than possibly the plug wire is bad.

You should not drive it with a misfire as you could ruin the catalytic converter which is very expensive to replace.

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Check engine light came on the computer said misfire on number 2 and number 7. I installed new plugs and wires. The check engine light went off, but it still seems to be missing and idling rough. When you...


replace the cap,and rotor,if this does not help,use a good fuel cleaner,like lucas,and heet together for cleaning and moister.You may have clogged injectors,also check the fuel filter,if there is not enough fuel pressure it will do this also.

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it sounds like an intake vacuum leak to me. check with propane or acetylene

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we get remans bad out of the box......... good luck

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