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Re: 4 cyl 1998 dodge dakota
Hi this depends on how bad it is this with the engine off i presumme all vechicles have to breath is there any bad oil leaks or is it running rough but when you take the oil cap off it idles better if so you need to check pcv valve system first if there is no blockages the the piston rings are badly worn but if your having no problems then you will be ok
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This issue is caused by crankcase pressure issue.
Normally filtered air enters the engine, runs through the crank case and then is pulled into the intake through the PCV valve. Durning hard acceleration, the PCV valve closes (to prevent explosion of fumes in crank case and blowing valve covers and pan off) and the PCV system reverses, with fumes coming back through the filtered intake.
Usually there is minimal oil that gets back into the air cleaner.
So, when somthing goes wrong, like excessive blow by, for example, the crankcase pressure overcomes the PCV valve and intake of fumes capability, and oily starts showing up in the air filter.
Investigate the crankcase pressure and PCV system.
replace the air filter,pcv valve and spark plugs if over 60 k and the wires are original replace dist cap rotor and wires also then clean the throttle bore spotless with cab cleaner and a rag scan for any codes and sensors out of range there is no fuel filter (it is part of the fuel pump)
there are 2 ports one for low pressure and one for high pressure. the low pressure is bigger in diameter and is usually close to the dryer and or fender and firewall. the high pressure is near the condensor on the fron of the vehicle. if there are caps for the ports low will be blue and high will be red. low side pressure should be 35-50 psi and high pressure should be 135-150 psi