car doesnt return to idle right away - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Thrill Capsule · 11-08-2004, 02:06 PM

I just finished swaping a lower mileage KA and M/T last week. Everything is up and running perfect. Except when say at a stop light the motor doesnt drop back down into idle. instead it revs at about 1700 rpm for 5-10 secs then goes down to Idle.

My EGR is half disconnected but i totally removed it and put a resistor in the line today and it made no difference.

The motor i swaped was a M/T and im still using the A/T harness and ECU. So there are 2 plugs that are supposed to go the TPS, but the M/T only has one. Could this be the reason?

Any opinions or other thoughts?

mjjstang · 11-08-2004, 03:00 PM

well im not sure at all, but are you sure your throttle cable is working correctly, like its not sticking a bit. worth a shot, should take 30 seconds to check.

joewantstodrift · 11-08-2004, 04:48 PM

im having the same problem with my sr. everyone says its a vacuum leak. i have to check it out in the next few days.

Thrill Capsule · 11-10-2004, 12:28 PM

Checked throttle cable and cleaned the throttle body and it is still doing the same thing. Any other suggestions?

stinky_180 · 11-10-2004, 01:47 PM

I have the same problem, and i cleaned the throttle body, cleaned aiv, cleaned iavc, and still no luck. But i do have a egr code and detonation code. from what i heard, if you block the egr tube on the exhuast side with a nickel or however you want, you can get ride of the problem.

Thrill Capsule · 11-10-2004, 09:27 PM

Yeah ive got the exhaust mani welded shut. Im hesitant on deletingthe whole system though, Im gonna hook it back up once i get a header.

Anyway sometime this week or next ill put the old A/T tps sensor on and see if that clears this up. It is very annoying

Oh yeah thanks for reminding me, im gonna check for codes. No CEL as of now, but it doesnt hurt to look.

stillmatic · 11-10-2004, 09:59 PM

The problem is the AUTO ecu. Swap it with a manual. Have you been having cold start problems as well?

Thrill Capsule · 11-11-2004, 09:23 PM

No cold start issues at all, but i will put the M/T ecu in then. See if that clears it up.

Thrill Capsule · 11-15-2004, 02:08 PM

The M/T ecu has cleared everything up. Thank you stillmatic.

11-08-2004, 02:06 PM	#1
Thrill Capsule Leaky Injector Join Date: Dec 2002 Location: S. NJ Age: 44 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	car doesnt return to idle right away I just finished swaping a lower mileage KA and M/T last week. Everything is up and running perfect. Except when say at a stop light the motor doesnt drop back down into idle. instead it revs at about 1700 rpm for 5-10 secs then goes down to Idle. My EGR is half disconnected but i totally removed it and put a resistor in the line today and it made no difference. The motor i swaped was a M/T and im still using the A/T harness and ECU. So there are 2 plugs that are supposed to go the TPS, but the M/T only has one. Could this be the reason? Any opinions or other thoughts? __________________

11-10-2004, 12:28 PM	#4
Thrill Capsule Leaky Injector Join Date: Dec 2002 Location: S. NJ Age: 44 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	Checked throttle cable and cleaned the throttle body and it is still doing the same thing. Any other suggestions? __________________

11-10-2004, 09:27 PM	#6
Thrill Capsule Leaky Injector Join Date: Dec 2002 Location: S. NJ Age: 44 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	Yeah ive got the exhaust mani welded shut. Im hesitant on deletingthe whole system though, Im gonna hook it back up once i get a header. Anyway sometime this week or next ill put the old A/T tps sensor on and see if that clears this up. It is very annoying Oh yeah thanks for reminding me, im gonna check for codes. No CEL as of now, but it doesnt hurt to look. __________________

11-11-2004, 09:23 PM	#8
Thrill Capsule Leaky Injector Join Date: Dec 2002 Location: S. NJ Age: 44 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	No cold start issues at all, but i will put the M/T ecu in then. See if that clears it up. __________________

11-15-2004, 02:08 PM	#9
Thrill Capsule Leaky Injector Join Date: Dec 2002 Location: S. NJ Age: 44 Posts: 119 Trader Rating: (0) Feedback Score: 0 reviews	The M/T ecu has cleared everything up. Thank you stillmatic. __________________

11-08-2004, 03:00 PM	#2
mjjstang Post Whore! Join Date: Apr 2003 Location: Michigan Posts: 2,654 Trader Rating: (5) Feedback Score: 5 reviews	well im not sure at all, but are you sure your throttle cable is working correctly, like its not sticking a bit. worth a shot, should take 30 seconds to check.

11-08-2004, 04:48 PM	#3
joewantstodrift Zilvia Junkie Join Date: Jan 2004 Location: Champaign, IL Age: 38 Posts: 410 Trader Rating: (3) Feedback Score: 3 reviews	im having the same problem with my sr. everyone says its a vacuum leak. i have to check it out in the next few days.

11-10-2004, 01:47 PM	#5
stinky_180 Nissanaholic! Join Date: May 2004 Location: Pale Blue Dot Age: 40 Posts: 2,064 Trader Rating: (26) Feedback Score: 26 reviews	I have the same problem, and i cleaned the throttle body, cleaned aiv, cleaned iavc, and still no luck. But i do have a egr code and detonation code. from what i heard, if you block the egr tube on the exhuast side with a nickel or however you want, you can get ride of the problem.

11-10-2004, 09:59 PM	#7
stillmatic Zilvia Junkie Join Date: Sep 2003 Location: Bay Area, CA Posts: 421 Trader Rating: (0) Feedback Score: 0 reviews	The problem is the AUTO ecu. Swap it with a manual. Have you been having cold start problems as well?