hesitating motor - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

90240ka · 02-11-2003, 01:09 PM

I have a 90 240 coupe, and I have tried countless times to fix this problem.

Problem: When I start my car, my revs steadily drop from .837(normal idle) to .350 then jump back up to 1.40 and it does the same thing until the car has totally warmed up, then is stays in between 1.000 and .750

Solution: I have bought new fuel injectors, plugs & wires, Fuel Filter, I am tempted to buy a new fuel pump, but thought I would come here and get some suggestions, before I spend more money, and not getting the problem fixed.

I also have another problem, my heater vents are not working, my defrost works, that is my only form of heat right now, I dont know if this is mechanical or and electrical problem. if you guys could help me out it would be greatly appreciated.

Tyler Durdan · 02-11-2003, 03:04 PM

It could be an o2 sensor that causing the fluctuation at idle. As for the heater vents, is it that no heat comes out, or no air at all. If it's no air at all, check the vent motor (don't know the exact name of it)...it's electrical. Autozone, or dealer depending if you want to spend the extra bucks for the oem part. Easy fix...takes about ten minutes. It's located at the passenger side near the firewall I believe...that's where they are on most cars, but check under your hood and see if your getting voltage from it. It could also be a blown fuse or short in the wires somewhere, but my money's on the the motor.

90240ka · 02-11-2003, 04:44 PM

I am pretty damn new to this car, and I am wondering where the o2 sensor is located.

**mrmephistopheles** · 02-11-2003, 06:22 PM

Look near the bottom of the exhaust manifold.

90240ka · 02-11-2003, 06:50 PM

I believe I fould it, how do I know that it is bad or not.

02-11-2003, 01:09 PM	#1
90240ka Join Date: Jan 2003 Location: olympia, wa Age: 41 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	hesitating motor I have a 90 240 coupe, and I have tried countless times to fix this problem. Problem: When I start my car, my revs steadily drop from .837(normal idle) to .350 then jump back up to 1.40 and it does the same thing until the car has totally warmed up, then is stays in between 1.000 and .750 Solution: I have bought new fuel injectors, plugs & wires, Fuel Filter, I am tempted to buy a new fuel pump, but thought I would come here and get some suggestions, before I spend more money, and not getting the problem fixed. I also have another problem, my heater vents are not working, my defrost works, that is my only form of heat right now, I dont know if this is mechanical or and electrical problem. if you guys could help me out it would be greatly appreciated. __________________ dreamin of droppin in an sr20det

02-11-2003, 03:04 PM	#2
Tyler Durdan Zilvia Junkie Join Date: Feb 2002 Location: Don't mess with Texas Posts: 546 Trader Rating: (0) Feedback Score: 0 reviews	It could be an o2 sensor that causing the fluctuation at idle. As for the heater vents, is it that no heat comes out, or no air at all. If it's no air at all, check the vent motor (don't know the exact name of it)...it's electrical. Autozone, or dealer depending if you want to spend the extra bucks for the oem part. Easy fix...takes about ten minutes. It's located at the passenger side near the firewall I believe...that's where they are on most cars, but check under your hood and see if your getting voltage from it. It could also be a blown fuse or short in the wires somewhere, but my money's on the the motor. __________________ "Pure adrenaline attached to a license plate.  Isn't it time to experience one yourself?"                           -Dan Gurney Turbo for Sale

02-11-2003, 04:44 PM	#3
90240ka Join Date: Jan 2003 Location: olympia, wa Age: 41 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	wheres the 02 sensor I am pretty damn new to this car, and I am wondering where the o2 sensor is located. __________________ dreamin of droppin in an sr20det

02-11-2003, 06:50 PM	#5
90240ka Join Date: Jan 2003 Location: olympia, wa Age: 41 Posts: 33 Trader Rating: (0) Feedback Score: 0 reviews	found it......I think I believe I fould it, how do I know that it is bad or not. __________________ dreamin of droppin in an sr20det

02-11-2003, 06:22 PM	#4
mrmephistopheles Magnanimous Justice Distribution Service Join Date: Mar 2002 Location: BFE Age: 23 Posts: 14,372 Trader Rating: (9) Rides Gallery: mrmephistopheles Feedback Score: 9 reviews	Look near the bottom of the exhaust manifold.