Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome! My name is ***** ***** I can assist you with your question. What size engine do you have?
Have you checked for a blown head gasket?
So do you know what is causing it to run rough?
Ok have you pressure checked the cooling system?
Well, I would at least start by ruling out any major stuff like a cracked cylinder head or a blown head gasket.
If the converter was plugged up, it would prevent the engine from accellerating under a heavy load.
You can remove the fron oxygen sensor to see if that will help but I dont think this is the problem. In addition, what are the chances that two or more spark plugs when bad at the same time? It is not very likley.
The most common cause would be a blown head gasket, cooling fans not working or plugged radiator. I have seen plugged or restricted heater or coolant hoses so be sure to check those as well.
Ok, good. Then pressure checking the cooling system and running a block test or checking for HC's in the radiator would be a good things to do next as well.
Anything is possible. It is worth checking into..
It will hold pressure for a while.. this is good. But this does not mean the head gaskets are good.
With the engine cold and engine turned off.
EXCELLENT!! This means there are no coolant leaks
I would get one from the dealership just to be sure. Then after installing it, be sure to bleed the cooling system (I am sure you did this when installing the last thermostat)
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With the engine cold, remove the radiator cap and start it up. Let it idle until it is up to operating temp. Then pick up the engine rpms to about 1500 for about 10 minutes or until the cooling fan comes on. Then install the cap and that should do the trick
Excellent! Glad to hear we got to the bottom of it! The misfire codes will need to be diagnosed and fixed. I would check the fuel system and ignition system first and go after the Po138 as that might be causing the misfire codes.
You can check fuel pressure using a fuel pressure tester. One of the easiest ways to check the ignition system is to spray a light mist of water on the ignition components and see if the engine starts to run rough. If so, the tune up parts are bad and will need to be replaced.