Quote:
Originally Posted by bdcanetti
So I had the dreaded O.S. issue here in freezing Buffalo, NY on my 2001 4.4 X5. I read and read on here and had the typical symptoms. I removed the old O.S. and hoses and they were full of white sludge and the hoses were soft and deteriorating. I also changed the Valve cover gaskets. After I was done I took it for a ride and SES light was still blinking and it ran like crap! Same symptoms only worse misfiring and shaking. So I thought maybe I fouled the plugs. Changed them and still bad. NOW WHAT??!! Coils, Worse? Someone please help before I have to drop it off at the stealer. Thanks.
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In addition to getting the codes read and rechecking your work and the coils, check the CCV if it's original.
Did you replace the crankcase vent valve (attached to the rear of the intake manifold)? It might look okay on the outside, but the rubber gills on the inside are probably all clogged up like the OS. There is also a small oil vent hose that runs under the intake manifold to the CCV.
The intake manifold and throttle control gaskets might need some attention if they original.
Get the codes read and please report back.
Many of us here are like CSI--we want to know the outcome.