I just got my 89 Sentra back on the road for the first time in 7 months. I put a full tank in her at the station down the road and 3 days later I done knocked it out and I had only been 250 miles and I filled it up again with some better gas and shes still getting the same mileage. Before I parked it I was hittin low 30's with my foot in the throttle body. Im driving her easy now and I dont get it. I know its running rich because of the black smoke that comes out the pipes when I rev it up a little. I still have good power and throttle response. Other than the thermostat being messed up it runs like a champ. Speaking of that the new thermostat makes the engine run too cold. I also took the cat off and now I run a glasspack with dual side pipes. So I dont know if taking the cat off is making all this happen. It should get better mpg since the exhaust is freer flowing. This car used to maintain 35-38 mpg when I first started driving it and it has slowly went down. The EGR checks out pretty good because I can make the diapragm go up and down with little effort. I found that a sensor on the intake was disconnected and I hooked it back up. The backfiring when gearing down went a away some but it still does it...and we are talking foot long flames coming out of the pipes. It looks cool but I know its not supposed to do that.
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I just got my 89 Sentra back on the road for the first time in 7 months. I put a full tank in her at the station down the road and 3 days later I done knocked it out and I had only been 250 miles and I filled it up again with some better gas and shes still getting the same mileage. Before I parked it I was hittin low 30's with my foot in the throttle body. Im driving her easy now and I dont get it. I know its running rich because of the black smoke that comes out the pipes when I rev it up a little. I still have good power and throttle response. Other than the thermostat being messed up it runs like a champ. Speaking of that the new thermostat makes the engine run too cold. I also took the cat off and now I run a glasspack with dual side pipes. So I dont know if taking the cat off is making all this happen. It should get better mpg since the exhaust is freer flowing. This car used to maintain 35-38 mpg when I first started driving it and it has slowly went down. The EGR checks out pretty good because I can make the diapragm go up and down with little effort. I found that a sensor on the intake was disconnected and I hooked it back up. The backfiring when gearing down went a away some but it still does it...and we are talking foot long flames coming out of the pipes. It looks cool but I know its not supposed to do that.
The backfiring is probbaly the Anti-Backfire valve malfunctioning. Look at my thread called the GA16I how to thread on allnissans. I would bet that your low mileage is because of this crappy gas they are giving us has alot of alcohol in in, and is causing everyone to get lower mileage.
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89 Sentra owner 9 years 205,000 miles and counting!
I dont know...I have noticed a difference in my 05 Sentra or my Accord. But I also did alot of thinking and the thermostat could be causing the car to get bad mileage. I notice the gas guage falls fast in the morning but doesnt move in the hot afternoon in SC. I also need to replace my vacuum hoses.
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Yea and what size hose I need to use. Also I can conclude that since its gotten alot hotter in SC the gas mileage DID improve because the car ran about a half a cm above C. I put about 3.5 gallons in it and I already been 100 miles with more to go. Got the OEM t-stat ordered and ready to go on monday!
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I make custom shift knobs. PM me with your design or a picture of a shift knob that you would like to acquire!
Linear Mode
