Engine Performance problem
1983 BMW 320 4 cyl Two Wheel Drive Manual 260K miles
My car has been idling roughly for a year. For impending sale, I adjusted the valves to.007" all around. This seemed to help, marginally. It failed Calif smog test because of "inconsistent timing mark, rough idle." I've been here before 2-3 times in the past 10 years. It's usually a cracked intake boot.
I have replaced the intake boot, the air filter (2 mos ago), the throttle valve gasket, cleaned the throttle valve (it was sooty), cleaned the air speed screw and replaced the o-ring, replaced the fuel pump, the fuel filter, and the fuel pump relay.
The car will run for about 5 seconds without accel pedal after sitting for an hour, as if it's using the cold start valve gas. If I can get it started, it will run fine with the throttle wide open. So I know the new pump is working.
Suspect: fouled plugs, accelerator cable stop needs adjustment, bad idle slide valve, air filter dirty from oil leak, corroded ground at fuse box.
What are your thoughts?
have the same problem?
Tuesday, August 4th, 2009 AT 2:38 AM