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Old 03-07-2005, 06:17 PM
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Join Date: Mar 2005
Posts: 3
poor fuel economy / hard start when sitting for a while

Does someone have an idea why my mb 300te would deliver such poor fuel economy and would replacement of the injectors help? I also have a hard time starting it after it has been siting idle for a while and I suspect that there is a leak of system pressure somewhere.

M Vincent

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Old 03-07-2005, 07:02 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,212
Are you talking about "hard starting" after a heat soak, such as a half-hour after shutting it down hot, or hard cold starting in the morning.

Is the idle speed control satisfactory?

You really need to be more specific with symptoms if you expect anyone to steer you in the proper direction.

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Old 03-08-2005, 12:02 AM
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Originally Posted by Duke2.6
Are you talking about "hard starting" after a heat soak, such as a half-hour after shutting it down hot, or hard cold starting in the morning.

I noticed that today. I let the car idle while dealing with a sunroof problem. In that time, the engine got hot enough for the aux fan to come on, at which point I turned the car off. About 20 to 30 minutes later, I needed three long cranks to start the car. I shut down then immediately restarted, it fired up normally. What causes this?

Also, after a cold start, there seems to be some fuel flow sluggishness. I can floor the accelerator, the economy need will move to the max level, but the engine will not rev for 2 or 3 seconds, and will then kick in. Someone suggested this might be a fuel accumulator problem, but because it appears to be temperature related, that does not sound right. Any ideas?

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