The car started missing one day so I replaced the plugs and wires and it ran worse. When I pulled the old plugs out the seemed fine, when it ran worse with the new plugs I thought it was the coil pack so I changed it. Then the parts store said that I had the wrong type of plugs and when I took them out number 5 was fouled. Fast forward I replaced the plugs wires and coil twice, still numberr 5 fouls. The plug comes out black, not oil. I thought stuck injector, I stopped asking the autoparts people for advice. I took the injectors out preassure checked and cleaned them but none were stuck but I put them back in different locations anyway. Still number 5 fouls out imediatly. WHAT THE. Im think electrical now but dont know where to start.
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Re: number 5 cylinder fouling out 3.8
It don't sound electrical to me sense you chg. all that, the plugs you put in are they a hotter plug? You don't by chance have a broken valve spring do ya, thats what it sounds like to me. Just sounds to me that its valve spring most likely exhaust valve.
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A fouled or worn plug (spark gap too big) can do that. Also a bad ignition wire can do that. These are especially suspect if it is a particular cylinder that is missing. You may be able to ID it if you get a check engine light and the code is misfire cyl no. 3 or something like that. If it gets worse in rainy / damp weather, suspect a coil pack, spark plug boot or spark plug wire getting wet. If it is not a specific cylinder it may be a clogged fuel filter causing insufficient fuel pressure during high demand such as acceleration or pulling a hill.
First I would pull plugs if its missing ,it seems like only running on 3 cylinders ,you'll find spark plug all loaded up and fouled clean or replace with new.If vehical uses excessive oil peticularly on freeway, possibly just head needs valve guide seals.
If you pull the plug wire from the spark plug on cylinder 3, is there any oil, water, or antifreeze in there? Have you removed the plug to see what condition it is in? If it is black or oil-fouled, you should replace it, or better yet, the entire set of spark plugs. When the coil pack was replaced, was the plug wire replaced as well? I have seen a stuck fuel injector cause your problem before, because the cylinder does not get the right amount of fuel, running either too lean, or too rich.
When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?
1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug. Then that cylinder is not firing.
2 - Check for spark at that wire. If you do-not have Spark there, But the other wires do... the wire going to that cylinder is BAD.
3 - If you have the correct firing order and spark at all cylinders then the cylinder that did-not change the speed of engine has a compresstion problem. Bad valves, Piston or rings are bad... Major engine work and Major repair bill for the repair job.... GOOD LUCK....
You can find the miss by starting the engine and pulling one plug at a time. when you find the one that doesn't change how the engine runs, there is your problem area. things to do are, first I would switch the wire and see if the miss goes away. If it doesn't then pull the plug and see if it is fouled out. do a compression test on that cylinder. if the compressionis low you can spray some wd40 in the cylinder and retest. if the pressure comes up then the rings are bad, if it doesn't then you have a valve problem.let me know
Check your distributor cap & wires first. If all is ok pull the spark plug and check if it's oil fouled. If there is no oil on the plug the plug might be bad. if there is oil on the plug you can get an adaptor that screws over the end of the plug and shields it from getting oil fouled. Of course this is a temporary solution for a piston ring or valve seal problem. I had a caddy I ran with plug shields fo 5 years so they work! Good luck!....PS If your plug is oil fouled you can also use a heavier oil like a 20/50 or use 4 quarts of 10/40 and a quart of lucas oil stabilizer. This will help keep the oil where it belongs and don't forget to do an oil change every 2,500 to 3000 miles.
Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!