1500 Idle ecu related? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Tantwoforty · 07-16-2009, 02:40 PM

I installed another ecu and harness into my s13 ka, and before i swapped the ecu and harness the car idled at like 600-700. after the swap i lost slot of power in the high end and i have a 1500rpm idle. could the ecu be causing this or should i look into other options. i also have a cel i didnt have before. any posative input would be great

aNskY · 07-16-2009, 10:32 PM

did you do anything else beside change the harness and ecu?

Tantwoforty · 07-17-2009, 01:28 AM

nope. maybe the ecu needs to be reset... idk

superJoy · 07-17-2009, 01:32 AM

I had a high idle, around 1600 rpm.

Turned out to be a bad TPS. (throttle position sensor)

May not be what's going on in your case. But if you have a spare like I did you could just throw it on and see what happens.

Tantwoforty · 07-17-2009, 02:00 AM

oh that could be it, maybe i failed at soldering and a wire popped off, since i switched the tps to this harness, would a bad or missing tps throw a cel?

superJoy · 07-17-2009, 02:07 AM

No idea on the CEL thing, I've never had to mess with that on my car.

I think the FSM outlines a test for the TPS where you use an ohmmeter or voltmeter or something like that. Test if it's reading right.

In any case. Could be worth looking into.

Tantwoforty · 07-17-2009, 02:15 AM

yea i was already thinking about that, i unplugged the tps and started the car and it did the same exact thing as when it was plugged in

slider2828 · 07-17-2009, 09:43 AM

Its the mechanical warm up.... fast idle thing that sticks out... It happened to my friends car... Just look for fast idle in the manual. Its a piece of wax that coolant goes throgh in the TB so that when the wax melts, the idle doesn't push the throttle open. Is your throttle touching the stopper on your intake manifold.?

07-16-2009, 02:40 PM	#1
Tantwoforty Nissanaholic! Join Date: May 2009 Location: Riverside ca Age: 35 Posts: 1,890 Trader Rating: (20) Feedback Score: 20 reviews	1500 Idle ecu related? I installed another ecu and harness into my s13 ka, and before i swapped the ecu and harness the car idled at like 600-700. after the swap i lost slot of power in the high end and i have a 1500rpm idle. could the ecu be causing this or should i look into other options. i also have a cel i didnt have before. any posative input would be great

07-17-2009, 09:43 AM	#8
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	Its the mechanical warm up.... fast idle thing that sticks out... It happened to my friends car... Just look for fast idle in the manual. Its a piece of wax that coolant goes throgh in the TB so that when the wax melts, the idle doesn't push the throttle open. Is your throttle touching the stopper on your intake manifold.? __________________ Turn and Burn!

07-16-2009, 10:32 PM	#2
aNskY Nissanaholic! Join Date: Apr 2005 Location: NY Age: 41 Posts: 1,604 Trader Rating: (10) Feedback Score: 10 reviews	did you do anything else beside change the harness and ecu?

07-17-2009, 01:28 AM	#3
Tantwoforty Nissanaholic! Join Date: May 2009 Location: Riverside ca Age: 35 Posts: 1,890 Trader Rating: (20) Feedback Score: 20 reviews	nope. maybe the ecu needs to be reset... idk

07-17-2009, 01:32 AM	#4
superJoy Leaky Injector Join Date: Aug 2006 Location: Detroit Posts: 142 Trader Rating: (0) Feedback Score: 0 reviews	I had a high idle, around 1600 rpm. Turned out to be a bad TPS. (throttle position sensor) May not be what's going on in your case. But if you have a spare like I did you could just throw it on and see what happens.

07-17-2009, 02:00 AM	#5
Tantwoforty Nissanaholic! Join Date: May 2009 Location: Riverside ca Age: 35 Posts: 1,890 Trader Rating: (20) Feedback Score: 20 reviews	oh that could be it, maybe i failed at soldering and a wire popped off, since i switched the tps to this harness, would a bad or missing tps throw a cel?

07-17-2009, 02:07 AM	#6
superJoy Leaky Injector Join Date: Aug 2006 Location: Detroit Posts: 142 Trader Rating: (0) Feedback Score: 0 reviews	No idea on the CEL thing, I've never had to mess with that on my car. I think the FSM outlines a test for the TPS where you use an ohmmeter or voltmeter or something like that. Test if it's reading right. In any case. Could be worth looking into.

07-17-2009, 02:15 AM	#7
Tantwoforty Nissanaholic! Join Date: May 2009 Location: Riverside ca Age: 35 Posts: 1,890 Trader Rating: (20) Feedback Score: 20 reviews	yea i was already thinking about that, i unplugged the tps and started the car and it did the same exact thing as when it was plugged in