I have a 98 2.5L Ranger with 82,000 miles on it. I just changed the oil and gave it a sea foam. When I start the vehicle, the exhaust smells different than it used to. I also have been hearing spark knocking a lot too. I cleaned my MAF and my IAC. What would cause the change in exhaust smell? I also notied a lot more soot on the tips as well. I hope to god it isn't buring oil. I take really good care of it so at 82,00 I doubt it is oil buring. Any help would work! Thanks

 

change your Spark Plug, after sea foam is possible to get dirty plugs.

also check your wires.

 

i just changed them not that long ago, but, can that cause a lot of soot on my exhaust tips. The exhaust also smells hot like something is buring.