1. Home
  2. Nissan Autos
  3. 86 300zx stalls when warmed up

86 300zx stalls when warmed up

86 300zx nonturbo a/t w/202K miles on it stalls when warmed up. Driveability is jerky at best. Replaced cap and rotor w/Nissan one, tried gumout intank, disconnected fuel temp sensor w/no change, changed 02 sensor,spark plugs(oem)chaged 20K ago, plug wires 30K old,tried different octane. Funny thing though I can drive 50 miles on the highway at highway speed with no problem but once I get to the off ramp at a stop light the problem comes. ECU codes are 12-(low out volt when eng is low),21-(ign sig not entered in 10 times),31-(on/off sig not entered when ign sw not turned on),41-(fuel temp sensor opened or shorted). Funny thing though I had these same codes back in 2001 when I ran an ECU test for another problem so I do not have much faith in those. All help appreciated. Grey-hound
Reply to
Grey-hound
Loading thread data ...

Ignore the ecu codes on that car, they are worthless information. At that point they didn't have the fault checked together at all.

First thing I'd look at is the AIV valve and make sure it isn't dumping exhaust gas through the MAS/AF meter whatever you want to call it. Sounds like this may have happened and ruined the MAS.

Another thing I've seen on high milage cars is the engine is using some oil and giving a bad signal to the O2 sensor. It see's the oil as fuel and leans out the engine. Try running it with the O2 sensor unplugged and see how it reacts.

Same with the coolant temp sensor, there is a subharness connector on the pass side of the plenum and the computer does into a default countdown timer setting for the temp when it's unplugged and run. if that helps replace the sensor AND the subharness. It's a mother to get to and requires a funky special tool to remove without taking the front of the engine apart.

Hope this helps you get in the right direction.

Reply to
Steve T

^^^Another thing I've seen on high milage cars is the engine is using some oil and giving a bad signal to the O2 sensor. It see's the oil as fuel and leans out the engine. Try running it with the O2 sensor unplugged and see how it reacts.

***Tried this and it was the same. I burn about 1 qt 10w-30w Mobil1 every 1500 miles. Thanks for the other great >
Reply to
Grey-hound

Yea that's not "using oil" in my book. Good luck and let us know what you find.

Reply to
Steve T

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.