Thread: Need help! horrible gas mileage, hard warm starts, fans running constantly.

I was over in the general section and a very nice member suggest I post here to see if i can find anyone nearby to help me fix my issues on my 92 sentra se-r with a jdm sr20de swap. I am located in middle TN halfway between chattanooga and nashville on I24.

Here is the link to my original post explaining whats going on and whats been done so far to try and fix it.
http://www.sr20-forum.com/general-sr20/61958-jdm-sr20de-swap-b13-se-r-warm-start-issue-horrible-gas-mileage.html

Thanks in advance!

alright guys I just wanted to post an update to let you all know what I have already tried.

1. I have swapped the distributor and coil (also played with the timing adjustment on the distributor)

2. I have swapped the fuel injectors, rail, and fuel pressure regulator

3. I have swapped the two wire temperature sensor on the backside of the engine (passenger side)

4. unplugged the two wire temperature sensor while engine was running and the fans continued to run

5. Checked the spark plugs

6. played with the idle screw on the IACV

7. unplugged the constantly running coolant fans and then adjusted the idle per the instruction manual

8. bled the coolant system multiple times

9. double checked the plugs for the TPS and MAF



And again to recap, sometimes at lower rpm i get a VERY SLIGHT bog or hesitation until i give it a little more throttle while accelerating. I am getting HORRIBLE gas mileage- took me about a half a tank to go 100 miles. When cold starting, it starts right up but does have somewhat of an erratic idle (surges for a few seconds until it finds where it wants to idle. When starting it after it is warm (whether fully warm or partially warm) it will start but then dies again immediately if I don't give it throttle for a few seconds and let off of the throttle slowly. Also as I have said above, I am not throwing any check engine lights. I am completely stumped as to where to go from here.

ANY ideas or help would be greatly appreciated. I just need to get this thing running right so I can drive back and forth to school 70 miles per day.

If your fans are on as soon as you turn the key, when the car is cold, then it's in limp mode because it can't read the temp sensor. Search this forum and sr20forum.com for limp fan

Fans ON (all the time), Code 13, car runs poorly.... - SR20 Forum

radiator fans always running - SR20 Forum

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thanks for all the help guys... Tried a 3rd temperature sensor and now all is well. Just goes to show you can't count on parts to be good unless you know first hand they are. Thanks again!

Wiring might be the culprit other than the sensor itself.