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MPG real low!!

 
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Old 04-29-2009, 02:19 PM
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MPG real low!!

almost a year ago my timing belt broke and that was all she wrote. My engine was pretty much gone unless i dropped a pretty good amount of cash. Through an awesome blessing i ended getting a new h23 for free and all the work done for free!! Ever since the swap my mpg has been real low. I used to average around 375 highway and 350 city. On my last tank i got 200 city. Im not speeding around like a maniac. If anything i drove crazier when the other engine was in. What could be the problem? Fuel management system? I have no real clue. The only thing was last time i turned my car on my girlfriend said she could smell gas. Any ideas?
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Old 04-29-2009, 02:43 PM
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Re: MPG real low!!

leak in a fuel line??? or tank??..you have to bear in mind not every engine is the same though and some generally drink more than others
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Old 04-29-2009, 08:08 PM
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Re: MPG real low!!

i understand that but to differ over 100 miles from everyone else seems weird
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Old 04-29-2009, 08:16 PM
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Re: MPG real low!!

My fireds truck was doing this seemed to run fine but you could smell gas. Turned out he needs a new router cab and button. Check the spark plugs and all that to see how good the spark is. Any CEL on ?
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Old 04-29-2009, 08:19 PM
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Re: MPG real low!!

that doesnt sound normal. check fuel pressure regulator lines, fuel lines for leaks, sounds like your using alot of fuel but all of it cant go into your engine.
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Old 04-29-2009, 08:20 PM
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Re: MPG real low!!

I asume you're using the correct ECU...

Your EGR may be clogged. TB need cleaning, fuel filter changing, air filter, cat need changing, O2 sensor changing, or injectors. It could be any single or combination of any of those, and I'm sure I'm forgetting some.
If you're smelling gas, look around the fuel rail and injectors for starters, crank it, and rev it, and just trace it back to the tank till yo find something.
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Old 04-30-2009, 12:50 AM
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Re: MPG real low!!

maybe you're running hella rich on the fuel mixture, not sure if a tune is necessary after your swap?
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Old 04-30-2009, 10:10 AM
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Re: MPG real low!!

dunno bro, change the fuel filter. i got alot better mpg when i did that to mah lude
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Old 05-05-2009, 07:34 PM
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Re: MPG real low!!

i know the car was tuned. sparks cables all that stuff was replaced. i guess i can start with the fuel filter and maybe the o2 sensor. thanks guys
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