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|3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.|
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Originally Posted by and0pand0
1991 BMW 318is, M42 engine
On my way to school last friday, my car started to idle funky... It was staying at about 650 and going up/down by about 75 rpms. I could rear the engine doing it. It was very cold outside, there was ice on my windshield. I figured it was just reacting to the cold weather.
On my way to school, it seemed like there was flat spots in my RPM range. Sometimes it would accelerate fine, but other times it felt like I was being pulled back or something? Over the weekend I pulled out my plugs and it looked like I was running lean. I removed the upper/lower intake manifold and got new gaskets. The walls inside the intake manifolds were CAKED in oil or something? Especially the lower intake manifold. A lot of the hoses were cracked, and so I replaced them, cleaned out the intake manifolds and cleaned the fuel injectors which already weren't that dirty and put everything back together (head-scratching because I had no vacuum diagram... I couldn't get one from school, OR EVEN THE DEALER!). Now the car sounds a lot better =) But it's still surging at idle, going up/down about 75rpms. I removed the valve cover to check the gasket for leaks, but I dont see any at all. Infact the rocker cover gasket looks like it's in great shape, along with my cams =)
So uhhh... where do I go from here?
Originally Posted by Kowalski
remove your valve cover again, look at the top of it, take off that rubber seal, clean it up nicley, get some hi temp scilicon, and run a thin bead all the way along and then put the plastic piece back on. you were getting oil in your lines from that unit. that should probably solve your problem, if not, then let me know.
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