Unstable and random idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Saviorsoul · 07-18-2008, 12:00 PM

s13 ka24de

Some reason I just CAN NOT get my car to idle properly. Its eratic and random! I can't figure out what the hell it is..

What I've tried to fix it:

Searched high & low for vacum leaks
Replaced TPS, calibrated correctly
Replaced lower collector w/ IACV off a running motor
MAFS is new
Checked grounds and fuses, all ok..

Yeah, so I'm out of ideas. Anyone else have some?

(Emissions removed) New rebuilt motor

**Phlip** · 07-18-2008, 12:06 PM

I don't see anything suggesting that you've checked ignition (plugs/wires, coilm, etc.) or injectors... Have you?

jyb116 · 07-18-2008, 12:09 PM

could be exhaust leak thats what happend when i got mine

Saviorsoul · 07-18-2008, 12:14 PM

Quote:

Originally Posted by PHLIP

I don't see anything suggesting that you've checked ignition (plugs/wires, coilm, etc.) or injectors... Have you?

plugs new (took out and cleaned as well)
Checked wires (If I take them out they all produce a substancial loss in engine speed)
MSD Coil2 (new)
Injectors new as well O-rings installed correctly.

Saviorsoul · 07-18-2008, 12:16 PM

Quote:

Originally Posted by jyb116

could be exhaust leak thats what happend when i got mine

... I have a penny sized exhause leak, but I can't see how that could cauase my idle to be eratic.. I'm trying to find pair of Hotshot 4-2-1 ceramic coated headers to fix my exhaust leak, and get better performance at once... (fuckn shity pacesetters)

osal · 07-18-2008, 07:48 PM

tryin running some seafoam, it help alot estabilizing my idle.
Also check ur ignition timing

singlecamslam · 07-18-2008, 08:12 PM

Try the EGR and try to run engine codes.

*racepar1* · 07-18-2008, 08:15 PM

I did a write-up on this, search for it!

Saviorsoul · 07-19-2008, 11:46 PM

Quote:

Originally Posted by osal

tryin running some seafoam, it help alot estabilizing my idle.
Also check ur ignition timing

Its a new motor, doesn't need seafoam, BUT I did it anyway. No help

Saviorsoul · 07-19-2008, 11:47 PM

Quote:

Originally Posted by singlecamslam

Try the EGR and try to run engine codes.

I don't have emissions. An I don't have a check engine light either.

blownoffvalve · 07-20-2008, 09:24 AM

wow i didnt know an exhaust leak would actually cause this problem

*racepar1* · 07-20-2008, 12:26 PM

Quote:

Originally Posted by Saviorsoul

Its a new motor, doesn't need seafoam, BUT I did it anyway. No help

Quote:

Originally Posted by Saviorsoul

I don't have emissions. An I don't have a check engine light either.

Like I told you SEARCH for my write-up! Stop being an idiot and listen! I'm not going to hold your damn hand, but I will point you in the right direction!

Bigsyke · 07-20-2008, 12:51 PM

Exhaust leak the size of a penny? Yea.......not good, And emissions are directly inline with your vac system, even when capped off. Isnt the Evac constantly purging?

Clean out the IACV, check the alternator load.

pink godzila · 07-20-2008, 01:05 PM

Might wanna try to clean the Intake Manifold and replace a new Knock sensor.
Due to the old KA there will be alot of carbon stick inside the manifold so it could cause engine performace and idling problem. Also it could casue the EGR not working properly so try to clean the Manifold.

*racepar1* · 07-20-2008, 02:39 PM

I give up!
Irregular idle fix KADE

phi_ho1 · 07-20-2008, 02:41 PM

best is to check the MAF. 75 percent is will be it.

*racepar1* · 07-20-2008, 02:49 PM

Quote:

Originally Posted by phi_ho1

best is to check the MAF. 75 percent is will be it.

WRONG! MAF's rarely go bad, especially on nissans. Is anybody going to read the damn thread that I wrote? I mean what the hell! People were bugging the hell out of me to write it, and nobody wants to read the damn thing!

red240 · 07-20-2008, 04:59 PM

Quote:

Originally Posted by racepar1

WRONG! MAF's rarely go bad, especially on nissans. Is anybody going to read the damn thread that I wrote? I mean what the hell! People were bugging the hell out of me to write it, and nobody wants to read the damn thing!

I read it,good job! Going to do it to as I have Idle problems with my s14sr
Mine runs fine for a few min. then stumbles then idles good again randomly

Saviorsoul · 07-22-2008, 09:52 AM

Quote:

Originally Posted by racepar1

I give up!
Irregular idle fix KADE

lol just listening to their ideas. I found your write up. I just haven't had enough free time when its not 103 degrees F in the shade out here. I'm going to try it, it makes sense and if its helped two of your friends I'll damn well try it.

Saviorsoul · 07-22-2008, 09:54 AM

Quote:

Originally Posted by phi_ho1

best is to check the MAF. 75 percent is will be it.

.90 percent of the time IF the MAFS goes out you encounter a 2300RPM (rev limiter) Your car pretty much won't allow you to rev past 2300. I don't know if its a saftey protocol, or just from it being fucked up, but I've encountered it on two 240s. My MAF did go bad, but I replaced it and its fine now. I can use my full rev band. Thanks for the idea though.

Saviorsoul · 07-22-2008, 10:01 AM

Quote:

Originally Posted by pink godzila

Might wanna try to clean the Intake Manifold and replace a new Knock sensor.
Due to the old KA there will be alot of carbon stick inside the manifold so it could cause engine performace and idling problem. Also it could casue the EGR not working properly so try to clean the Manifold.

Read my origonal post. Its a rebuilt motor. My intake was sandblasted. There is NO carbon build up and my knock sensor is fine, plus all the sensor does it retard your timing if it senses a knock, and when it goes bad it almost always throws a code. (Plus its new, OEM from Nissan)

Saviorsoul · 07-22-2008, 10:03 AM

Quote:

Originally Posted by pink godzila

Also it could casue the EGR not working properly so try to clean the Manifold.

I don't live in So Cal. I have no emissions.

LA_phantom_240 · 08-01-2008, 11:31 PM

Quote:

Originally Posted by Saviorsoul

.90 percent of the time IF the MAFS goes out you encounter a 2300RPM (rev limiter) Your car pretty much won't allow you to rev past 2300. I don't know if its a saftey protocol, or just from it being fucked up, but I've encountered it on two 240s. My MAF did go bad, but I replaced it and its fine now. I can use my full rev band. Thanks for the idea though.

No, actually we blew up the MAF.
And goddamnit Eric don't fucking post a million times. Ctrl+C is your friend when trying to quote multiple posts.
My idle is a bit erratic myself lol. But I've got more on my plate after that fiasco last night.

07-18-2008, 12:00 PM	#1
Saviorsoul Leaky Injector Join Date: Jan 2008 Location: Slidell, Louisiana Posts: 96 Trader Rating: (0) Feedback Score: 0 reviews	Unstable and random idle s13 ka24de Some reason I just CAN NOT get my car to idle properly. Its eratic and random! I can't figure out what the hell it is.. What I've tried to fix it: Searched high & low for vacum leaks Replaced TPS, calibrated correctly Replaced lower collector w/ IACV off a running motor MAFS is new Checked grounds and fuses, all ok.. Yeah, so I'm out of ideas. Anyone else have some? (Emissions removed) New rebuilt motor Last edited by Saviorsoul; 07-22-2008 at 10:10 AM..

07-18-2008, 08:12 PM	#7
singlecamslam Nissanaholic! Join Date: Apr 2008 Location: Norcal Posts: 2,299 Trader Rating: (9) Feedback Score: 9 reviews	Try the EGR and try to run engine codes. __________________ Nothing says racecar like a stock car with no interior.

07-18-2008, 08:15 PM	#8
racepar1 I hate your "missile" Join Date: Jul 2007 Location: Simi Valley, CA Age: 30 Posts: 7,308 Trader Rating: (79) Rides Gallery: racepar1 Feedback Score: 79 reviews	I did a write-up on this, search for it! __________________ "He's one of those "drift" guys, that's like ballroom dancing to me." -Paul Tracy Need a mechanic in so-cal? PM me!

07-20-2008, 02:39 PM	#15
racepar1 I hate your "missile" Join Date: Jul 2007 Location: Simi Valley, CA Age: 30 Posts: 7,308 Trader Rating: (79) Rides Gallery: racepar1 Feedback Score: 79 reviews	I give up! Irregular idle fix KADE __________________ "He's one of those "drift" guys, that's like ballroom dancing to me." -Paul Tracy Need a mechanic in so-cal? PM me!

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07-18-2008, 12:09 PM	#3
jyb116 Banned from the Marketplace Join Date: May 2008 Location: Regina Sk Posts: 252 Trader Rating: (3) Feedback Score: 3 reviews	could be exhaust leak thats what happend when i got mine

07-18-2008, 07:48 PM	#6
osal Leaky Injector Join Date: Dec 2007 Location: Rockville Age: 24 Posts: 132 Trader Rating: (3) Feedback Score: 3 reviews	tryin running some seafoam, it help alot estabilizing my idle. Also check ur ignition timing

07-20-2008, 09:24 AM	#11
blownoffvalve Leaky Injector Join Date: Oct 2006 Location: cali Posts: 108 Trader Rating: (0) Feedback Score: 0 reviews	wow i didnt know an exhaust leak would actually cause this problem

07-20-2008, 12:51 PM	#13
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 28 Posts: 1,335 Trader Rating: (0) Feedback Score: 0 reviews	Exhaust leak the size of a penny? Yea.......not good, And emissions are directly inline with your vac system, even when capped off. Isnt the Evac constantly purging? Clean out the IACV, check the alternator load.

07-20-2008, 01:05 PM	#14
pink godzila Zilvia.net Advertiser Join Date: Dec 2007 Location: SoCal / Japan Tokyo Posts: 4,005 Trader Rating: (214) Feedback Score: 214 reviews	Might wanna try to clean the Intake Manifold and replace a new Knock sensor. Due to the old KA there will be alot of carbon stick inside the manifold so it could cause engine performace and idling problem. Also it could casue the EGR not working properly so try to clean the Manifold.

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07-20-2008, 02:41 PM	#16
phi_ho1 Nissanaholic! Join Date: Jun 2008 Location: CALI - OC 714 Garden Grove Posts: 1,812 Trader Rating: (56) Feedback Score: 56 reviews	best is to check the MAF. 75 percent is will be it.