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post #8 of (permalink) Old 30th March 2008
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Vacuum hose

Had a similar problem with my Scenic - spluttering, chugging and giving me 15m.p.g.

Traced to the vacuum hose being split - apparently a common fault.

If you look at the engine bay standing in front you will see the injection unit at the back of the engine (connected to the 'tube' leading to the air filter. To the right and mounted on the bulkhead is a small square unit (the MAP sensor ) If you put your hand between the two parts you will find a hose - it's about 6 inches long with a 90 degree bend at each end (so you can't actually see where it joins the back of the injection unit) You'll probably need a small flat blade screwdriver to prise the MAP sensor end off and just pull the other end.

Hope this helps.
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