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Changed spark plugs wires and coils now engin is knocking starting ruff and wont stay running why?

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  • Anonymous Mar 23, 2014

    we change the spark plugs and ignition plugs and now the car wont start



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Year, make, model, engine size?

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Posted on Mar 19, 2011


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Codes P0325, P0330, P0300, P0308, P1404, P0058. I know. ..just went to get my oil change the mechanic told me he had found the engine light with those codes. It's a 2005 Dodge Durango V8-287 4.7L SOHC. I...

These codes are telling you that you are having cylinders misfiring..And the knock sensor is picking up detonation knocks..with all these codes your engine must be running really bad.. Start by checking your spark plugs.. spark plug wires, coils.. EGR system. If you allow this condition to continue it will ruin youir cats.. a very costly repair. Check to see which cylinder is misfiring.. One of the codes indicated it was #8 cylindler. run the engine and disconnect the spark plug.. if there is no change or very little change in how the engine is running.. try moving the wire to another plug and moving that plug wire to the #8.. If the Problem travels with the wire.. its the wire.. if #8 still has the problem.check the plug and coil... Keep looking until you find the ofending cylinders and repair them.. Check to make sure the hoses are hooked up to your EGR and it is functioning... post a comment here and let us know how you are doing.

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Probably a head gasket problem,once again. It's burning the coolant off the plug . To make sure ,use a "block tester" from NAPA ,it is a liquid that changes color with the presence of exhaust gas in the coolant.

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before you go for the worst position, get first the spark plug out and check if it is burnt. Have you changed spark plugs before? Second If the spark plug is ok,then do a compression test,to see whether you do have any problem with either an inlet or exhaust valve. The other thing is since you swap coil,have you checked whether the faulty coil works or not on the other spark plug? if it is working and the good coil on the faulty cylinder does work then the fault is either on the coil side,or the wiring from the ECU to the coil is either broken,cracked,or shorted. The last thing you do then is the ECU.

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A multi misfire may mean that one or more of the following has happened:
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The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

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How do you change spark plugs and wires

Remove the plastic coil cover from the middle of each valve cover. Remove the coils. Unscrew and remove the spark plugs. Installation is the reverse....

If you have wires, you have three coils and not six and you've actually got wires. To remove one end of a wire, first twist, then pull. If it won't twist, use spray silicone lubricant.

You may have a large plastic beauty cover over the top of your engine. If it's in the way, remove the four nuts and the cover.


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