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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 2006Missing
1987 BMW 325i, 200K+ miles It started to miss at high, then intermediate speeds. Has the power of a weak 4 cylinder and the gas consumption of a V8 (lately around 15mpg) I hear some strange, scary noises coming from the engine area. Almost like an electrical short. And really rich smell of gas. It's running very rich. Sounds like an ignition problem? What do I check first, coil? I start with the distributor cap and rotor and then suspect the fuel filter or a blocked/dirty air filter. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 1987 BMW 325i, 200K+ miles > [quoted text clipped - 10 lines] > > What do I check first, coil? How do you know its running rich? sounds like a gas leak for openers. > 1987 BMW 325i, 200K+ miles > [quoted text clipped - 10 lines] > > What do I check first, coil? One other thing you can check. Under your rear seat passenger side is your fuel pump. You can make sure its seated well, but it may be weak. > 1987 BMW 325i, 200K+ miles > [quoted text clipped - 10 lines] > > What do I check first, coil? I am suspecting it's the spark plugs being coated with oil. I have a valve cover gasket leak. If the plugs are coated with oil, I am not getting a spark. Inline 2.5L 6-cyl should be a torqy motor but it feels like I am right on 3 cylinders. I wonder if most of them are not even firing. That would explain extremely poor MPG, lack of power, having to floor it to get going. Of course I will also check the dist. cap and other items mentioned. Given that I have the valve cover gasket oil leak, I decided to change all spark plugs. When I took out the old ones, there were really bad. One, on cylinder #3 was baked with lots oil, there was no gap at all. Probably no spark at all. Unfortunately, I couldn't install the new AC Delco spark plugs. The old plug wires wouldn't fit on them, and the old spark plugs had what appeared to be some kind of thread. Initially I thought the metal cap part of spark plug got stuck inside the plug wire boot, but such as was not the case, as all 6 of them were like that. So I merely cleaned the plugs by scraping the baked oil off and put them back. I also installed a coil I got from the junk yard. I took it for a test drive -- much better. Feels more like a 6-cylinder. All this time I was running on about 4-5 cylinders or even fewer. Not sure if it's the "new" coil that made a difference or the spark plugs. Maybe my MPG will rise above 12. I am sure that the dist. cap and the rotor probably could use replacement. The lesson here is it pays to keep the ignition system in top condition. |
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