CEL and no acceleration

redondoaveb · 07-23-2021, 09:32 PM

Quote:

Originally Posted by NissanZ34

Yes he does want to help me! I just talked to him and he thinks the problem is more than likely in the tune. He would check out my data logs and even send me a stock tune file. Thank you for recommending me Eugene Turkov, he really seems like a nice guy. I think I'm in good hands now.

He is always willing to help. You are in good hands

NissanZ34 · 07-23-2021, 09:33 PM

Quote:

Originally Posted by Rusty

The O2 sensor could have gotten damaged during the install of the cats. A lot of times, if a impact gun was used on the bolts before removing the sensors. The vibrations from the gun will kill the sensors. A lot of people on here have had that issue.

Thing is my car was perfectly working before going to the tuning shop so I do not think the dealership did a wrong installation as I remember seeing him hand tight the sensors then use a wrench to torque it. Could o2 sensors break on a dyno due to heat or vibration transmitted to the car from the tow straps?

Rusty · 07-23-2021, 09:40 PM

Quote:

Originally Posted by NissanZ34

Thing is my car was perfectly working before going to the tuning shop so I do not think the dealership did a wrong installation as I remember seeing him hand tight the sensors then use a wrench to torque it. Could o2 sensors break on a dyno due to heat or vibration transmitted to the car from the tow straps?

I don't think so. It would have to be a really lean, or really rich mixture to foul the sensors.

NissanZ34 · 07-23-2021, 09:48 PM

Quote:

Originally Posted by Rusty

I don't think so. It would have to be a really lean, or really rich mixture to foul the sensors.

The tuner did 10 pulls before final flash could this be it. I remember first pull was pissing gas from the tail pipes.

Rusty · 07-23-2021, 10:43 PM

Quote:

Originally Posted by NissanZ34

The tuner did 10 pulls before final flash could this be it. I remember first pull was pissing gas from the tail pipes.

If you had gasoline running out the pipes. The sensors could be coated with soot. If that's the case. You could try to remove them and use a spray cleaner on them.

ShadowJester6 · 07-26-2021, 02:10 PM

Any time I hear about limp mode/loss of power problems, I have flashbacks. I was having limp mode problems a couple years ago. Car would go into limp randomly. Sometimes it would run fine for days and sometimes would happen three minutes after starting the car. The only thing that seemed to temporarily fix the problem was let it sit overnight, disconnect battery for awhile, or use an app to clear any CELs (sometimes there were some, sometimes there weren't). All options inconvenient. As before, it would go back into limp after un undetermined time for undetermined reasons. Of all the things it could have/should have been, and all the things I tinkered with or swapped, it turned out to be the throttle bodies. I took them off and they looked spotless, but I hit them with some throttle body cleaner anyways and put them back on and now years later haven't had the problem come back once. Can't say if it will help your problem, but a couple dollars for a can of cleaner and 10 minutes of work won't hurt anything.

NissanZ34 · 07-30-2021, 10:36 AM

Changed the o2 sensors, cleaned the throttle bodies, cleaned the MAF sensors, cleaned the air filters and it's still happening.

JARblue · 07-30-2021, 10:46 AM

Everything in this thread I've read seems to point towards something in the tune being the issue

redondoaveb · 07-30-2021, 11:45 AM

Quote:

Originally Posted by JARblue

Everything in this thread I've read seems to point towards something in the tune being the issue

That was suggested in the second post

NissanZ34 · 08-11-2021, 08:02 PM

The original tuner made things right and richened up the AFR. He also disabled secondary o2 sensors. Car is a bit less snappy but does not pull timing anymore.

07-26-2021, 02:10 PM	#36 (permalink)
ShadowJester6 Base Member Join Date: Dec 2015 Location: Oregon Posts: 23 Drives: '13 370z NISMO - MT Rep Power: 9	Any time I hear about limp mode/loss of power problems, I have flashbacks. I was having limp mode problems a couple years ago. Car would go into limp randomly. Sometimes it would run fine for days and sometimes would happen three minutes after starting the car. The only thing that seemed to temporarily fix the problem was let it sit overnight, disconnect battery for awhile, or use an app to clear any CELs (sometimes there were some, sometimes there weren't). All options inconvenient. As before, it would go back into limp after un undetermined time for undetermined reasons. Of all the things it could have/should have been, and all the things I tinkered with or swapped, it turned out to be the throttle bodies. I took them off and they looked spotless, but I hit them with some throttle body cleaner anyways and put them back on and now years later haven't had the problem come back once. Can't say if it will help your problem, but a couple dollars for a can of cleaner and 10 minutes of work won't hurt anything. NissanZ34 likes this.

07-30-2021, 10:46 AM	#38 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	Everything in this thread I've read seems to point towards something in the tune being the issue redondoaveb likes this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

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07-30-2021, 10:36 AM	#37 (permalink)
NissanZ34 Base Member Join Date: Jun 2019 Location: Canada Posts: 92 Drives: 2010 370z 6MT Rep Power: 6	Changed the o2 sensors, cleaned the throttle bodies, cleaned the MAF sensors, cleaned the air filters and it's still happening.

08-11-2021, 08:02 PM	#40 (permalink)
NissanZ34 Base Member Join Date: Jun 2019 Location: Canada Posts: 92 Drives: 2010 370z 6MT Rep Power: 6	The original tuner made things right and richened up the AFR. He also disabled secondary o2 sensors. Car is a bit less snappy but does not pull timing anymore.