FI LTH rpm jumps

Morfiy · 12-27-2013, 10:47 AM

Hi commanders,
I need some help
The thing is, i've install FI LTH and now i have my idle rpms jumping.
Config is following: Intake, cat back and LTH.
Some says it will return back to normal once 150 miles passed, some says I need to "teach" throttles. But throttles doesn't adjust because of pure fuel mix.
I am going to upload UpRev soon, but for now this rpms are making my crazy )

Thank you

DEpointfive0 · 12-27-2013, 10:54 AM

It's most likely your intake
Do you have any check engine lights?

Morfiy · 12-27-2013, 11:23 AM

Quote:

Originally Posted by DEpointfive0

It's most likely your intake
Do you have any check engine lights?

Yes i have "Engine Service Soon" light

Riptide67 · 12-27-2013, 12:17 PM

Clear the code and you should be good to go. It's probably bc your AFR is off.

Rusty · 12-27-2013, 03:15 PM

Did you use an air impact to remove the O2 sensors? If you did. There is a good chance that one or more O2 senors may be bad.

DEpointfive0 · 12-27-2013, 04:24 PM

Quote:

Originally Posted by Riptide67

Clear the code and you should be good to go. It's probably bc your AFR is off.

Doubt it. But to cover your bases, OP get the code, then disconnect the negative terminal and let the car relearn

Morfiy · 12-27-2013, 04:41 PM

Quote:

Originally Posted by Rusty

Did you use an air impact to remove the O2 sensors? If you did. There is a good chance that one or more O2 senors may be bad.

We just have unscrew them and return back. But i'll check again.

gomer_110 · 12-27-2013, 07:28 PM

Besides damage to the O2 sensors you should check the following:

1. Intake plumbing leaks after the MAF sensors.
2. MAF sensors (damaged/improper installation)
3. Exhaust leaks
4. Proper wiring of the O2 sensors (the ones that had their wiring lengthened for the LTH install)

Also if you post up the code(s) that you're getting, most likely some one on here has seen this issue before.

F.I. Inc. · 12-27-2013, 10:19 PM

Quote:

Originally Posted by Morfiy

Hi commanders,
I need some help
The thing is, i've install FI LTH and now i have my idle rpms jumping.
Config is following: Intake, cat back and LTH.
Some says it will return back to normal once 150 miles passed, some says I need to "teach" throttles. But throttles doesn't adjust because of pure fuel mix.
I am going to upload UpRev soon, but for now this rpms are making my crazy )

Thank you

I received your second email a short while ago. My apologies for not getting back to you, I was on the dyno all day. If you are getting a CEL than there is something wrong with the installation! You SHOULD NOT get a CEL with our headers, ever! 9 time out of 10 it is related to the front O2 sensors being extended. Either the connection is not good and/or the O2 sensor was damaged during the removal or install of the headers. The rear O2 sensor will not trip the light because they have not been extended and are screwed into our "J" Bend style Anti Fouler.

If it is not the O2 sensors than it is most likely related to your MAF's. The best course of action is to check the code and email the description to me. From there, I can help you move forward.

Thanks, Tony

Morfiy · 12-28-2013, 03:36 AM

I felt something strange from the first crank up! I even went to OD Nissan to check faults, but they didn't finalize anything. Then I've been told to teach throttles, but as long as the CEL is lit it doesn't work.
Looks like really something strange with O2 Sensors. Going to come back on same service to find a reason.

Tony, Thank you again and again.

Morfiy · 12-28-2013, 05:22 PM

Solved,
MAF sensors were dusty.
Thanks everybody

F.I. Inc. · 12-28-2013, 05:42 PM

Quote:

Originally Posted by Morfiy

Solved,
MAF sensors were dusty.
Thanks everybody

Glad to hear it!

After the year you have had, it is nice to see something go smooth.

Thanks, Tony

Morfiy · 01-02-2014, 07:52 AM

Thanks Tony,

..It's been a long time =)

12-27-2013, 10:47 AM	#1 (permalink)
Morfiy Base Member Join Date: Dec 2012 Location: Russia Posts: 209 Drives: 370Z "Authentic" Rep Power: 12	FI LTH rpm jumps Hi commanders, I need some help The thing is, i've install FI LTH and now i have my idle rpms jumping. Config is following: Intake, cat back and LTH. Some says it will return back to normal once 150 miles passed, some says I need to "teach" throttles. But throttles doesn't adjust because of pure fuel mix. I am going to upload UpRev soon, but for now this rpms are making my crazy ) Thank you

12-27-2013, 10:54 AM	#2 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	It's most likely your intake Do you have any check engine lights? TerribleONE likes this. __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

12-27-2013, 12:17 PM	#4 (permalink)
Riptide67 A True Z Fanatic Join Date: Jul 2013 Location: Oak Harbor, WA Age: 36 Posts: 1,610 Drives: 09 Nismo #0483 PW Rep Power: 68	Clear the code and you should be good to go. It's probably bc your AFR is off. __________________ 2009 Nismo 370Z and 1975 Datsun 280Z 2+2 - PNW_INC - Legacy_Ohana Follow me on Instagam @s3zero_z3four

12-27-2013, 03:15 PM	#5 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,873 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Did you use an air impact to remove the O2 sensors? If you did. There is a good chance that one or more O2 senors may be bad. F.I. Inc. and Morfiy like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

12-27-2013, 07:28 PM	#8 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36940	Besides damage to the O2 sensors you should check the following: 1. Intake plumbing leaks after the MAF sensors. 2. MAF sensors (damaged/improper installation) 3. Exhaust leaks 4. Proper wiring of the O2 sensors (the ones that had their wiring lengthened for the LTH install) Also if you post up the code(s) that you're getting, most likely some one on here has seen this issue before. DEpointfive0 and Morfiy like this. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

12-28-2013, 03:36 AM	#10 (permalink)
Morfiy Base Member Join Date: Dec 2012 Location: Russia Posts: 209 Drives: 370Z "Authentic" Rep Power: 12	I felt something strange from the first crank up! I even went to OD Nissan to check faults, but they didn't finalize anything. Then I've been told to teach throttles, but as long as the CEL is lit it doesn't work. Looks like really something strange with O2 Sensors. Going to come back on same service to find a reason. Tony, Thank you again and again.

12-28-2013, 05:22 PM	#11 (permalink)
Morfiy Base Member Join Date: Dec 2012 Location: Russia Posts: 209 Drives: 370Z "Authentic" Rep Power: 12	Solved, MAF sensors were dusty. Thanks everybody F.I. Inc. likes this.

01-02-2014, 07:52 AM	#13 (permalink)
Morfiy Base Member Join Date: Dec 2012 Location: Russia Posts: 209 Drives: 370Z "Authentic" Rep Power: 12	Thanks Tony, ..It's been a long time =)

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