Originally posted by Super Eta
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Rough idle while wait for green light.
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Originally posted by Vass325esOK.. How do I make the rpm go lower to 220 rpm instead 586 rpm (Smog required 220 rpm standard)
Your engine WILL NOT idle at 220 rpm. lol
These guys are right, something is measuring 586 ppm and the max allowable is 220 ppm. HOWEVER, without telling us WHICH GAS IS FAILING, then there is no way to help you. Is it failing for NOx? Hydrocarbons? CO?
If it's failing for NOx, I'd look for low fuel pressure, plugged fuel filter, clogged fuel injectors, severe overheating, advanced timing, vacuum leaks, and anything that causes the engine to get extremely hot. HC's: Leaking fuel injector, leaking fuel pressure regulator, vacuum leaks, excessive rich or lean, low compression, misfiring, bad O2 sensor. CO: high fuel pressure, excessive rich or lean, dirty air filter, bad O2 sensor.Dan
1989 325i 5-speed
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