Code 34 wont idle and running rich - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Boosted_ATL · 10-19-2014, 06:02 PM

Well my idle issues are back the car surges at idle and barely stays running, black smoke coming out of exhaust. It has been running rich all weekend also but just started this tonight. Checked ECU codes and I'm getting a code 34. I need to get this figured out tonight guys. I'm stuck at work right now.

Boosted_ATL · 10-19-2014, 09:29 PM

Little more info. I have a narrowband and sometimes it bounces around from lean to rich like it's supposed to and goes rich under boost. Other times it stays full rich all the time and the car runs like shit. im ggoing to pull the intake and check the ice in the morning. I don't think it's a boost/vacuum leak. Have 20" vacuum at idle and 9lbs boost at full throttle. I have a Mbc and it's set for 9. Didn't want to go any higher without tuning. I have changed the ecu temp sensor and checked all wiring connections under hood also. Does have a atmosphere vent bov but I don't see how that could affect the idle, and it's a intermittent problem. Any idea would be appreciated guys this is my daily.

cotbu · 10-20-2014, 09:11 AM

code 34 is knock sensor, which you haven't even mentioned as a repaired or replaced item.
The knock sensor code can cause the engine to run in the knock map, which is generally 10's on the wideband, but this doesn't happen immediately. so you probably missed the previous symptoms. check knock sensor harness, and wiring at the ecu, clear codes see if it comes back, replace knock sensor. If you're thinking of running a resistor don't! Get the ecu tuned and have the knock sensor disabled. Not recommended for a daily driven car.

Boosted_ATL · 10-20-2014, 09:46 AM

No I haven't replaced the knock sensor, I Just got that code last night that was something I'm going to do today. I did unplug it and it was still doing the same thing.

Boosted_ATL · 10-20-2014, 03:04 PM

Ok I replaced the knock sensor, cleaned out the IACV, and set the tps. Took it for a 5 minute test drive and it runs perfect. It's faster than it has ever been. Tps was way off 1v at closed throttle. I'm mad I had to spend $120 on a knock sensor but oh well.

I'm assuming that knock sensor has been bad and had been causing the ecu to pull timing and adding fuel the whole time.

Boosted_ATL · 10-20-2014, 03:25 PM

Oh and I forgot the ecu plug had a little corrosion so I cleaned that also

OnTheChip · 10-20-2014, 03:43 PM

I love happy endings!

Boosted_ATL · 10-20-2014, 08:02 PM

Quote:

Originally Posted by OnTheChip

I love happy endings!

Yep me to, I never get off this easy with my problems. I didnt think it would be this easy to find the problem. I was thinking it was going to be a lot harder to figure it all out. But as of tonight the car is still running great and has good power. Gonna be back out to the dragstrip on Nov 7th

10-19-2014, 06:02 PM	#1
Boosted_ATL Join Date: Sep 2014 Location: Atlanta Age: 38 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	Code 34 wont idle and running rich Well my idle issues are back the car surges at idle and barely stays running, black smoke coming out of exhaust. It has been running rich all weekend also but just started this tonight. Checked ECU codes and I'm getting a code 34. I need to get this figured out tonight guys. I'm stuck at work right now. __________________ 93 Silvia coupe LS1 with some stuff

10-19-2014, 09:29 PM	#2
Boosted_ATL Join Date: Sep 2014 Location: Atlanta Age: 38 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	Little more info. I have a narrowband and sometimes it bounces around from lean to rich like it's supposed to and goes rich under boost. Other times it stays full rich all the time and the car runs like shit. im ggoing to pull the intake and check the ice in the morning. I don't think it's a boost/vacuum leak. Have 20" vacuum at idle and 9lbs boost at full throttle. I have a Mbc and it's set for 9. Didn't want to go any higher without tuning. I have changed the ecu temp sensor and checked all wiring connections under hood also. Does have a atmosphere vent bov but I don't see how that could affect the idle, and it's a intermittent problem. Any idea would be appreciated guys this is my daily. __________________ 93 Silvia coupe LS1 with some stuff

10-20-2014, 09:11 AM	#3
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	code 34 is knock sensor, which you haven't even mentioned as a repaired or replaced item. The knock sensor code can cause the engine to run in the knock map, which is generally 10's on the wideband, but this doesn't happen immediately. so you probably missed the previous symptoms. check knock sensor harness, and wiring at the ecu, clear codes see if it comes back, replace knock sensor. If you're thinking of running a resistor don't! Get the ecu tuned and have the knock sensor disabled. Not recommended for a daily driven car. __________________ LoverTechnologies "Half Broken Things!"

10-20-2014, 09:46 AM	#4
Boosted_ATL Join Date: Sep 2014 Location: Atlanta Age: 38 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	No I haven't replaced the knock sensor, I Just got that code last night that was something I'm going to do today. I did unplug it and it was still doing the same thing. __________________ 93 Silvia coupe LS1 with some stuff

10-20-2014, 03:04 PM	#5
Boosted_ATL Join Date: Sep 2014 Location: Atlanta Age: 38 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	Ok I replaced the knock sensor, cleaned out the IACV, and set the tps. Took it for a 5 minute test drive and it runs perfect. It's faster than it has ever been. Tps was way off 1v at closed throttle. I'm mad I had to spend $120 on a knock sensor but oh well. I'm assuming that knock sensor has been bad and had been causing the ecu to pull timing and adding fuel the whole time. __________________ 93 Silvia coupe LS1 with some stuff

10-20-2014, 03:25 PM	#6
Boosted_ATL Join Date: Sep 2014 Location: Atlanta Age: 38 Posts: 31 Trader Rating: (0) Feedback Score: 0 reviews	Oh and I forgot the ecu plug had a little corrosion so I cleaned that also __________________ 93 Silvia coupe LS1 with some stuff

10-20-2014, 03:43 PM	#7
OnTheChip Zilvia Junkie Join Date: May 2013 Location: Burgaw, NC Posts: 317 Trader Rating: (0) Feedback Score: 0 reviews	I love happy endings! __________________ NismotronicSA - Speed-Density Tuning for Nissans

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