New Engine,Poor gas milage - Honda Civic Forum


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Old 03-28-2012   #1  
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New Engine,Poor gas milage

Hello, I'm new to this so I'm not sure I'm even in the right spot. I was looking for something that says "post new thread" but couldn't finf it..
Anyways, I own a 1998 Honda civic EX. I recently changed out the engine. It had a V tec motor in it and I put a 1.7 (not a Vtec) back in it. Tha engine I put in it has about 80,000 km on it. the gas milage is terrible now. I went from 45-50 mpg to 30-40. Should I have changed the computer on board as well to match the engine?
Thanks
Eric
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Old 03-28-2012   #2  
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Re: New Engine,Poor gas milage

I don't think you have to change the ECU but it has to atleast be re-flashed but I am not sure. Since the old one had the VTEC it is possible you need a whole new one.
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Old 03-28-2012   #3  
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Re: New Engine,Poor gas milage

what does reflashed mean
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Old 04-02-2012   #4  
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Re: New Engine,Poor gas milage

You need a new ecu. Maybe run some cleaner through it. Like seafoam.
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Old 04-02-2012   #5  
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Re: New Engine,Poor gas milage

Seafoam is good stuff
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Old 04-13-2012   #6  
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Re: New Engine,Poor gas milage

This is a favorite topic on the forums.
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Old 04-13-2012   #7  
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Re: New Engine,Poor gas milage

i hate how the gas mileage changed so muh from 6th gen to 7th gen the best i ever got was 35 and my mouth dropped when i did i get between 27 and 30 consistently -.-
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