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Old 08-08-2008, 04:37 PM   #7 (permalink)
Master EcoModder
Join Date: May 2008
Location: Briggsdale, Colorado
Posts: 296

Wildfire - '96 Ford Bronco XL
90 day: 14.88 mpg (US)

Blackford - '96 Ford Bronco XLT
90 day: 20.26 mpg (US)

Y2k - '00 Honda Insight
Gen-1 Insights
Team Honda
90 day: 73.98 mpg (US)

Redford V10 - '01 Ford F250 Lariat
90 day: 15.64 mpg (US)

FireFly - '00 Honda Insight DX
90 day: 69.43 mpg (US)

LittleRed - '00 Honda Insight
Thanks: 3
Thanked 31 Times in 14 Posts
How to check cylinder compression:

How to test car engine compression

Basically it is a hose with a gage that screws into a spark plug hole of one of the cylinders. Crank the engine a few times without the distributor or fuel and check the pressure. You do this for each cylinder. Don't quote me on the specs, but I believe over 200psi will be just fine, and as low as 180psi would be good too. If there is a big mismatch, or if one or more are much less than around 150psi or so, then there could be issues such as the common exhaust valve being burnt, especially in #2 cylinder. Again, don't quote me. I one of the cylinders are way low, then this is the problem with not being able to get fuel economy.

You might be able to make or borrow a gage. Of course you could buy one also. Most repair shops should have one handy. Over here in the US, we can rent one from an auto parts store.

Hope this helps.
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