Cold Start Problem Help!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

roel03 · 11-01-2008, 04:40 PM

Alright I have a 1998 Nissan 240SX. When I first got it it was automatic and I converted everything to a fivespeed. I know the usual cold start problems when doing this and it was fine for a long while I just needed to tap the gas when I first started it. But now for a good five minutes on a cold start the motor runs real bad and lags until optimal temperature. Also the tranny fluid is taking a while to warm up and the tranny shifts hard and rocks until warm. I was thinking maybe coolant temperature sensor?

What I used on the 5 speed swap and still am using :
-Stock OBD2 Auto ECU and Harness
-S13 OBD1 Tranny
-CEL for Crank Angle Sensor since the S13 tranny does not have it
-Motor has 65K on it. Tranny has 73K

What could be the problem here and what are ways that I can fix it and have my car run perfect again. FYI the swap was done by me about a year and a half ago. Let me know if you need anymore info on the car.

Thanks to all for your help and time!

surreybc · 11-01-2008, 06:24 PM

what is you idle when you are cold running? i forget exactly but it should be around 1200 . the air regulators only role is for giving more air to allow a higher idle when car cold. unplug or squeeze hose to see if it is opening up and providing extra air when car cold.

abunai the drifter · 11-01-2008, 07:11 PM

check your temp sensor it could be falty that could cause the hard start issue and just add some atf to your trans that should thin out the gear oil and help your hard shift problem

roel03 · 11-02-2008, 03:42 PM

My idle is stable and around 1K.

surreybc · 11-02-2008, 04:46 PM

Quote:

Originally Posted by roel03

My idle is stable and around 1K.

it should be 500 rpm higher during warmup on a cold morning. if your normal idle is 1k it should be 1.5 in the morning.

roel03 · 11-02-2008, 04:53 PM

Any clue on how to fix or what it could be?
I noticed in your previous post you stated the air regulators but where is this located? Thanks

surreybc · 11-02-2008, 05:45 PM

google the web for 240sx air regulator. check it is getting power . replace . intake manifold has to be removed

roel03 · 11-03-2008, 03:12 PM

I'm not ready to remove the intake manifold just yet. I want some help on how to start the car without having to be there to press a little on the gas for a second. I have a remote start and cant put it to use unless I'm in the drivers seat to tap the pedal.

11-01-2008, 04:40 PM	#1
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 33 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	Cold Start Problem Help!! Alright I have a 1998 Nissan 240SX. When I first got it it was automatic and I converted everything to a fivespeed. I know the usual cold start problems when doing this and it was fine for a long while I just needed to tap the gas when I first started it. But now for a good five minutes on a cold start the motor runs real bad and lags until optimal temperature. Also the tranny fluid is taking a while to warm up and the tranny shifts hard and rocks until warm. I was thinking maybe coolant temperature sensor? What I used on the 5 speed swap and still am using : -Stock OBD2 Auto ECU and Harness -S13 OBD1 Tranny -CEL for Crank Angle Sensor since the S13 tranny does not have it -Motor has 65K on it. Tranny has 73K What could be the problem here and what are ways that I can fix it and have my car run perfect again. FYI the swap was done by me about a year and a half ago. Let me know if you need anymore info on the car. Thanks to all for your help and time!

11-01-2008, 07:11 PM	#3
abunai the drifter Zilvia Junkie Join Date: Nov 2006 Location: Long Beach CA Age: 36 Posts: 392 Trader Rating: (5) Feedback Score: 5 reviews	check your temp sensor it could be falty that could cause the hard start issue and just add some atf to your trans that should thin out the gear oil and help your hard shift problem __________________ screw you guys im going drifting

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

11-01-2008, 06:24 PM	#2
surreybc Zilvia Junkie Join Date: Mar 2008 Location: surrey Posts: 359 Trader Rating: (1) Feedback Score: 1 reviews	what is you idle when you are cold running? i forget exactly but it should be around 1200 . the air regulators only role is for giving more air to allow a higher idle when car cold. unplug or squeeze hose to see if it is opening up and providing extra air when car cold.

11-02-2008, 03:42 PM	#4
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 33 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	My idle is stable and around 1K.

11-02-2008, 04:53 PM	#6
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 33 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	Any clue on how to fix or what it could be? I noticed in your previous post you stated the air regulators but where is this located? Thanks

11-02-2008, 05:45 PM	#7
surreybc Zilvia Junkie Join Date: Mar 2008 Location: surrey Posts: 359 Trader Rating: (1) Feedback Score: 1 reviews	google the web for 240sx air regulator. check it is getting power . replace . intake manifold has to be removed

11-03-2008, 03:12 PM	#8
roel03 Zilvia Addict Join Date: Oct 2006 Location: florida Age: 33 Posts: 807 Trader Rating: (23) Feedback Score: 23 reviews	I'm not ready to remove the intake manifold just yet. I want some help on how to start the car without having to be there to press a little on the gas for a second. I have a remote start and cant put it to use unless I'm in the drivers seat to tap the pedal.