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Leaky injector? Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 31 Aug 2006 07:45:32
In Reply to: running rich on restarts....black smoke puff, Troutman, Thu, 31 Aug 2006 05:09:00 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The O2 sensor probably isn't it. First reason is that even when warm, the O2 sensor doesn't control fuel immediately - there is a warm-up time. Second, the O2 sensor doesn't control that much fuel.
My guess is a leaky injector. You start the car and get it warmed up, and the fuel pressure comes up. Shut the car down, but the fuel pressure remains up there for a while. If you have a leaky injector, it'll be dribbling fuel into one cylinder. If you start up again in a short period of time (warm engine), all that fuel burns badly for a few engine rotations, giving you the smoke. If you let the car sit long enough (cold engine), two things happen - first, the fuel pressure drops down so the injector stops dribbling, and second, any fuel in the cylinder has the time to leak past the rings.
I'd look into it, because that extra fuel is bad in two ways. First, it isn't burning properly, and any raw fuel getting into the catalytic converter can damage it. Secondly, if you are stuffing raw fuel into the cylinder, it's washing the oil off the cylinder walls. This will cause extra wear on start up. Is it a lot? Probably not.
I'm not sure what 44K is, but I'd try some Techron or other well-known injector cleaner. I'd also let a warm car sit for a few minutes (10?) and pull the spark plugs. Any particular cylinder smell gassy?
This is just a guess. The burn-off idea is nice but probably not real. DI burn-off only occurs after a failed engine start, after you've turned the key to off. During a normal start the engine is trying to use the gasoline.
I guess a bad temp sensor might cause it. The Trionic enriches the mixture (extra fuel) on a cold start. If the temp sensor is lying, the Trionic could be thinking the engine was cold when it really was warm, and adding extra fuel. In a cold engine, some fuel sticks to the cold walls of the cylinder/intake and doesn't burn right away. Not so with a warm engine. So you might be running enriched for the first few hundred engine rotations. I'd check the coolant sensor (under the intake manifold). This is different from the temp sensor for the gauge (by the thermostat housing on the side of the engine)
posted by 192.249....
, Thu, 31 Aug 2006 07:45:32 <-- Viewing This Message, Fri, 1 Sep 2006 06:31:14
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