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Old 04-08-2009, 12:18 AM   #1 (permalink)
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DMC - '99 Honda Civic DX
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How come my MAP is higher? What controls it?

I went to get my car serviced since it's been a long time since that happened and they drained ALL the fluids and replaced them. The idle stayed the same ( think they adjusted it too) but the MAP is now higher. Before it was 3.9 while idling and now it's 4.1 (this is on the scangauge 2)

I thought that the lower it is the better, or am I missing something? I also had my valves adjusted, does it have anything to do with it?

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Old 04-08-2009, 06:37 AM   #2 (permalink)
dcb
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A clean air filter can make a difference in map. Engine needs a certain amount of o2, and there will be a bigger pressure drop over a dirty filter.

I assume hydraulic lifters so not sure what they would adjust on your valves though.

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