2001 Nisan Sentra - No Power. Please help!

[whammo77]

I have a 2001 Sentra 1.8L auto with 107,XXX miles. The car runs REALLY sluggish (no power until you get up to 3500 RPM). Here's what I can tell you:

1) There are no error messages
2) It has a brand new air filter
3) It has brand new spark plugs
4) MPG is about 22 every time
5) No power at all till 3500 RPM
6) It idles fine in park, rev, and drive.
7) No stalling issues
8) Has brand new Mass air flow sensor installed by Nissan
9) At lower RPM's (around 2000 or 2500) you can feel the car "pulsing", although you cannot see any change in the RPM's on the gauge.
10) It runs AWESOME when the temperature is BELOW freezing but terrible ABOVE freezing.

I have no clue what to look for next. Any ideas folks?

[Drivenyfz]

Does it sound like it is running Rich or Lean or is it more like an electrical issue? Is it sputtering like cutting in and out or just no power? What does the exhaust spell like? normal/sulffer?

[whammo77]

Acts like a faulty sensor issue. Doesn't sputter, cut out , smell unusual, etc. It just has no power when it is above freezing and /or raining.

[Drivenyfz]

Double check or replace your cap, rotor, distributor and coil/s for moisture, corrosion, or cracks. Also check all grounds and sensor connections for corrosion or loose connections. I have heard of bad grounds causing a lot of sensor related issues. And if you have a fault somewhere is your ignition system it could be running on only three cylinders until you finally get high enough rpms for the spark to jump the gap and start firing. Double check that you have spark on all cylinders and that spark plugs are gaped to spec.