will changing the timing chain and timing the ip change my fuel economy? im currently getting 22mpg and i would like to get a little more. im gonna be having my injectors rebuilt soon so that should change it a little. any ifo would be appreciated

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It depends, sorry, on whether your IP is out of time currently. If your chain has stretched and no one has adjusted the IP timing then you should see an increase. But, if your engine is starting and running strong currently, then any gain will be minimul.

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If your chain stretched and they reset the injection timing... but did not put an offset key into the cam sprocket... ( if it needed it ).. then you might check your chain stretch and see if you are over the amount suggested as acceptable...
According to the factory shop manual... when there is any performance complaint you MUST use the movement of the number one intake valve in the number one cylinder as your reference point...
Lots of good threads about how to do this correctly...
In other words... they might have only corrected the ip timing ... because that is relatively easy and quick... and not known about the need to keep the sprocket's relative position corrected also...which of course is your valve timing...

Probably. Could also be an over-adjusted ALDA (too rich) or dragging brakes.

Peter

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1972 220D ?? miles
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1987 300D Turbo killed 9/25/07, 275,000 miles
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1972 280 SE 4.5 165, 000 - It runs!