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i have a 92 civic hatch with a d16y8 that gets about 12 mpg. i've put in a new o2 sensor and map sensor. what else can i do? i can't drive fast because i have to put in my new clutch. but my oil turns black after a couple weeks. i do have an exhaust leak in my headers. but it's not that bad. the exhaust does come out black though.
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sounds like you are running too rich (too much fuel, too little air). im not sure where to start, maybe check the usual maintenance items like plugs, air filter, intake system parts (make sure they are cleaned up), injectors may not be spraying properly. try the gas and oil additives in my sig below
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Restore Performance, Reduce Costs www.lubecontrol.com
Are you using the new soy based fp-plus?
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ok, well i started with taking apart the air filter because it's an aftermarket. and i saw that a sensor wasn't plugged in. i found out that it's my tps but when i plugged it in my car revved kinda high, then leveled a little but it was still high. then the car just shut off
you need to reset the ecu after plugging everything back in. warm up the engine, turn off, then disconnect the battery. reconnect, start car, and let it idle 15 mins without any accessories or pressing gas. then turn off. you may want to clean the intake system parts and idle valves before doing the idle learn as well, and make sure the TB and other gaskets are sealing properly.
__________________
Restore Performance, Reduce Costs www.lubecontrol.com
Are you using the new soy based fp-plus?
________________________________________
Go Here For Real Medicine http://www.youngliving.com/
Member 1025782
________________________________________
Jobs wanted in boulder or louisville colorado.
PM me if you know companies that are hiring.
i don't have any way of telling if my gaskets are sealing properly. but i reset the ecu, and tried to let my car warm up but it kept shutting off. so i drove it around until it warmed up, which was pretty difficult. then i parked it, disconnected the battery and reconnected it. started the car and it idled at a couple different rpms and then just died. i tried it at least three times. so i just disconnected the tps.
may be a bad tps sensor then. its reading the wrong throttle position and the ecu is getting confused. and usually its easier to change the whole throttle body. they are around $50 on ebay for a used one.
__________________
Restore Performance, Reduce Costs www.lubecontrol.com
Are you using the new soy based fp-plus?
________________________________________
Go Here For Real Medicine http://www.youngliving.com/
Member 1025782
________________________________________
Jobs wanted in boulder or louisville colorado.
PM me if you know companies that are hiring.
i just took my car to the honda dealership. they looked at it, told me i had the wrong intake manifold on it and that i needed a fast idle thermo valve and gasket...they wanted to do it for 400 dollars.
i just took my car to the honda dealership. they looked at it, told me i had the wrong intake manifold on it and that i needed a fast idle thermo valve and gasket...they wanted to do it for 400 dollars.
I call BS on their behalf. $400! Damn what a rip off! Post pics, I'm almost certain your intake manifold is fine. Since you have a d16y8 engine, did you also get a d16y8 ecu? That would be my first guess and if the answer to that is no, get a new ECU. That'll be why you are running rich. My second guess would be either one or a combination of these; bad/dirty injectors, clogged fuel filter, bad spark plugs, bad spark plug wires, &/or a bad distributor cap and rotor.
To be cheap, if you do have the correct ECU, check and replace, if needed, your fuel filter. Then run a fuel injection cleaner like Gearbox recommended. I don't know when you last replaced your spark plugs but if its been awhile then just replace them and while you're doing that check the wires for any cracks.
very bad gas mileage 
