Join Date: Jun 2006
Location: Baltimore, MD
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I've noticed a similar problem; a couple times now on cold start up it'll buck and surge until I blip the gas pedal.
wonder if I'm seeing the early signs of that filter clogging thing people talk about all the time.
I've noticed that on cold, cold starts--like literally only the first start of the day--the motor will buck when you first start it up. You wait for the glow plugs to warm up, you fire it up, and as soon as it catches and turns over you release the ignition key just like you always do. At that point it'll buck pretty noticeably...imagine a big lumpy cam but slower. Vrum, vrum, vrum, vrum....like it's coughing and gasping for fuel. Give the gas pedal a quick blip and it levels out immediately and it doesn't happen again no matter how many more times you start it for the rest of the day.
I drained off a bunch of water from the water separator the other day, so it's probably not that. My guess is that a little bit of stuff has probably congealed on the filter and that it loosens up when the motor warms up, but that when it's a cold start the motor is gasping for more fuel. I'm going to pull the fuel filter and see if it's gunky. If that's not it, anyone have any other ideas about what causes it to buck at cold start idle?
The rest of the time it runs like a dream--quieter than ever, smoother, making more power than it ever has, so I don't think I've got an injector or fuel delivery problem for the most part.