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'88 CRX
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8 Posts
Discussion Starter #1
Are the bottom ends identical on both engines? Can I use a PM5 ECU on a stock d15b1 without any issues?
 

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'93 Civic D15B7/5spd
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120 Posts
The PM5 will work fine, but you'll see reduced mileage as it will be putting in a little more fuel. The D15B1's intake manifold has a restrictor plate between it and the throttlebody.

The only difference between the actual D15B2 and D15B1 long block is the cam profile. A D15B1 with a D15B2 cam is a D15B2. A D15B1 with a D15B7 cam is a D15B7. Casting numbers may be different between the three engines but the longblock, sans manifolds, are all the same dimensions.

Why are you wanting to run the D15B1 with a PM5? If you need a PM9 I have one laying around I'd sell for cheap.
 

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'88 CRX
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8 Posts
Discussion Starter #3
d15b1/d15b2

Here's what happened. My dad owns a 1988 Civic Lx with a stock d15b2. The engine smokes(280,xxx miles) so he was looking for a used engine to replace his with. A guy was advertising a running "d15b2" that my dad ended up buying. Turns out it wasn't a d15b2 but a d15b1. The guy selling it thought it was a b2 and has even offered to refund the money. My dad still wants the engine because it has 97,000 miles and ran smooth with no smoke. Compression was 180-190 across all cylinders. So my dad wants to know if the engine he bought will work with his computer, not throw any CELs, and pass emissions. Or does my dad need to try and get the PM9 from the guy that sold him the engine.
 
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