EPS Big Bore Throttle body Problem
Registered Member
Joined: Feb 2017
Posts: 363
Likes: 46
Registered Member
Joined: Jan 2018
Posts: 70
Likes: 9
From: Fort Worth, TX
How do you like the 75mm setup and did you have to tune with it like the EPS?
Moderador
Joined: Jun 2019
Posts: 2,626
Likes: 765
From: South Florida
Fuel dilation will be higher sending Ethanol into your oil diluting the oil over time.
Our cars can handle it however part of the reliability you get with these engines is because of factory tolerances, It makes great power however it's burned faster and not efficiently enough causing it to leak past oil rings into crank case.
Moderador
Joined: Jun 2019
Posts: 2,626
Likes: 765
From: South Florida
I feel most people here need to understand with any of these kits is that if you're having issues it is possible the throttle itself might have crapped out.
All of these kits start using a DE or Maxima throttle to keep the electronics aspects of them working. In the DE forums this was a common problem for individuals who sent their units for porting due to the sensitivity of the TPS part of it. They're all Nissan/Renault units and use the same flange.
As for the wiring, the patch harness should get you functioning and an idle re-learn should do. Again TBs could be faulty, At Nissan it's the first thing that is recommended, a new throttle. Looking back at the OP pics from the looks it looked like these units were used and possibly damaged in the process. There is no explanation why there is intermittent success.
My personal experience was a nightmare trying to get an OEM used unit to relearn, many pedal dances and a bit of work even with Consult.
The issue is that the computer tries to lower the idle however if the TPS is somewhat defective it can't start the procedure until the RPMs lower to the 3 digits. The TPS tells the computer that it's where it needs to be.
If it's not then new throttle, per some of my nissan friends they disconnect a coil to get the RPMs low enough so the program can start the procedure then erase the p0300.
If you're going to attempt this, make sure you have some smart friends and a patient tuner or you'll be making threads like this.
All of these kits start using a DE or Maxima throttle to keep the electronics aspects of them working. In the DE forums this was a common problem for individuals who sent their units for porting due to the sensitivity of the TPS part of it. They're all Nissan/Renault units and use the same flange.
As for the wiring, the patch harness should get you functioning and an idle re-learn should do. Again TBs could be faulty, At Nissan it's the first thing that is recommended, a new throttle. Looking back at the OP pics from the looks it looked like these units were used and possibly damaged in the process. There is no explanation why there is intermittent success.
My personal experience was a nightmare trying to get an OEM used unit to relearn, many pedal dances and a bit of work even with Consult.
The issue is that the computer tries to lower the idle however if the TPS is somewhat defective it can't start the procedure until the RPMs lower to the 3 digits. The TPS tells the computer that it's where it needs to be.
If it's not then new throttle, per some of my nissan friends they disconnect a coil to get the RPMs low enough so the program can start the procedure then erase the p0300.
If you're going to attempt this, make sure you have some smart friends and a patient tuner or you'll be making threads like this.
Registered Member
Joined: Jun 2020
Posts: 2
Likes: 0
From: Canada
I know moncef.faik@gmail.com 319.899.9763 from AdminTuning || Tuning Services || 370Z, G37 Intakes || 350Z, G35 Intakes || Oil Catch Can Solutions has tuned quite a few of EPS TB setups. Perhaps he can point you in the right direction?
The worst case scenario has happened and my G is in limp mode. In reading this thread I thought if anyone can solve my problem it would be Moncef from Admin Tuning but my message was ignored! Flat out ignored!
My hope was a tune would make it work? But if not I was open to getting the bigger TBs.
I do not understand why a tuner who specializes in these vehicles would ignore what would have been a customer? A simple yes I can or no would have sufficed.
Moderador
Joined: Jun 2019
Posts: 2,626
Likes: 765
From: South Florida
First of all, I appreciate all the information on this forum thank you. So I decided to bore and polish my throttle bodies as I am all about the sleeper status and also I figured I would save the $800.
The worst case scenario has happened and my G is in limp mode. In reading this thread I thought if anyone can solve my problem it would be Moncef from Admin Tuning but my message was ignored! Flat out ignored!
My hope was a tune would make it work? But if not I was open to getting the bigger TBs.
I do not understand why a tuner who specializes in these vehicles would ignore what would have been a customer? A simple yes I can or no would have sufficed.
The worst case scenario has happened and my G is in limp mode. In reading this thread I thought if anyone can solve my problem it would be Moncef from Admin Tuning but my message was ignored! Flat out ignored!
My hope was a tune would make it work? But if not I was open to getting the bigger TBs.
I do not understand why a tuner who specializes in these vehicles would ignore what would have been a customer? A simple yes I can or no would have sufficed.
The guy is really good which means getting ahold with be difficult and repetitive reaching out and/or hostility etc will probably end up getting ignored. For what I see he is on vacation, so keep trying and add him on IG.
Once he starts posting you could try it that way.
I
Thread Starter
Registered Member
Joined: Sep 2016
Posts: 23
Likes: 4
First of all, I appreciate all the information on this forum thank you. So I decided to bore and polish my throttle bodies as I am all about the sleeper status and also I figured I would save the $800.
The worst case scenario has happened and my G is in limp mode. In reading this thread I thought if anyone can solve my problem it would be Moncef from Admin Tuning but my message was ignored! Flat out ignored!
My hope was a tune would make it work? But if not I was open to getting the bigger TBs.
I do not understand why a tuner who specializes in these vehicles would ignore what would have been a customer? A simple yes I can or no would have sufficed.
The worst case scenario has happened and my G is in limp mode. In reading this thread I thought if anyone can solve my problem it would be Moncef from Admin Tuning but my message was ignored! Flat out ignored!
My hope was a tune would make it work? But if not I was open to getting the bigger TBs.
I do not understand why a tuner who specializes in these vehicles would ignore what would have been a customer? A simple yes I can or no would have sufficed.
I'm almost sure Moncef hasn't responded do to being out of town.
he's normally prompt when email with a issue when it comes to the G or Z's...
Just from experience you will be in the right hands once he returned your email.
I'm in Cali and these so-called Pro tuners out here are not pro tumors at all. I won't put them on blast but,I've hit up many different tune shops from the Bay Area to LA and no one could solve my problem and once I came on here and posted my issue someone shot me his information. I hit him up that same night and he got back to me ASAP.
Moncef got my car up and running literally in about an hour or two.
He did with no one else could do.
Trust me when I say that you're going to be in the right hands just be patient.
And just a little advice.
I understand the frustration that you're dealing with right now,but don't let it get the best of you and you get on here and say the wrong thing and miss your opportunity to get your car fixed properly buy a good dude.
Trust me he's a good dude and I do not know him personally other than talking to him on the phone and through email for a couple months.
Good luck and if you have any more questions feel free to hit me up....
Registered User
Joined: Mar 2025
Posts: 1
Likes: 0
I just installed a sit of EPS 70mm throttle bodies...
everything started off smooth...
i had a mechanic with over 10yrs experience install the throttle bodies.
Attempted to start the car and to no success it would not start.
After hours of fiddling around with throttle body relearn procedure that's recommended after the install we got another mechanic to install the OBD2 scanner and he got to digging and found a couple of codes and corrected those but still had one left that could not be corrected (code P1233)
I was told that I needed to take the car into the dealership so that they could do a throttle body relearn program thoroughly because the car was not running correctly.
So I did just that the next day.
The technician at the Infiniti dealership told me that he attempted 3 times this throttle body relearn procedure and for some reason it won't clear (pass).
He (Infiniti dealership mechanic) with over 20yrs of experience with infinities says its the throttle bodys...
So right away I had my wife contact EPS.
She spoke with Jack and explain to him that I was at the dealership having problems with the new EPS throttle bodies.
He called me I spoke with him and I also had him speak with the technician who had attempted this throttle body relearn three times.
The conversation was unsuccessful right along with the relearn.
Infiniti at this point no longer wanted to touch the car with these throttle bodies installed.
In few words told me good luck and farewell.
Jack states that if he was there with me he would have my car running in 10 minutes with no problems. He asked what state I was in I told him Northern California and he said that he had someone that was a tech who he trusted to work on his product. And that this guy was in Southern California.
Jack says that Infiniti doesn't know what they're doing and that I need to take it to a technician that knows what they're doing SMH because the throttle bodies now need to be tuned lol SMH.
I then tell him we do not have many good techs in Northern California nor can I find one who wants to help me with this problem.
Oh and did I forget to mention that Jack said if I don't get the right tuner I will spend a lot of money trying to get these things to work.
Go ****ing figure!!!
Whos the right one!!??
I found on nico's web a gentleman on there who purchased these same throttle bodies and was having the same problems with technicians not wanting to touch these throttle bodies and the ones who did had no success in getting these throttle bodies to work properly.
I guess they didn't know what they were doing either!!!
And this guy continue to stay in contact with Jack and Jack directed him in another direction for help and there was no success there either.
This guy spent lots of money in buying these TB's and traveling back and forth from NorCal to SoCal and the ending result is him returning the product back and just receiving credit.
BS!!!
I think that he should have gotten a full refund.
If it takes a specialist to work on your throttle bodies then why are they so called Plug and Play SMFH.
At this point with so many unsuccessful attempts with these throttle bodies they should just be discontinued and no longer sold to the public due to the agony,stress and money lose they've created amongst enthusiast of the car world.
So I took the car back to the mechanic who installed the throttle bodies he took out an OBD2 scanner and check for codes and found P1233.
I looked this code up and it's referring to the throttle bodies.
I emailed Jack and let him know what was going on and the new discovery that I had found with this code P1233.
Jack says that this is typically normal,nothing to worry about his guy in SoCal can possibly solve this problem and if he couldnt solve the problem on his own Jack would assist him in troubleshooting the problems SMH.
I hit this guy up but no reply yet.
Now I must say magically the car started acting normal for only a two-week period If that that.
So with this opportunity revealing itself I took the chance on putting the car on a Dyno and I got good numbers lol, didn't last long.
I actually got 16 more horsepower yesterday and today the car went limp and my check engine service light came on.
So can I call this a success!?
Truly not!
Seeing that the day after I got my tune the same problems I had before with these TB's occurred again, which is the car going into limp mode while driving with my kids in the car.
SMH,WTF, Dangerous you think!!!
This is pretty frustrating seeing how much money I have put into these TB's and having no true success in return...
This has become a royal pain in the derriere to say the least.
z1motorsports.com EPS 70MM TB'S $800
Mechanic: friend so i paid lil to nothing $$$
Infiniti dealership: $195
Z Car Garage tune: $650...
Im not sure how all these other success stories have worked...
who worked on these cars to make them so successful with these EPS TB'S.
I would love to know this.
Does anyone know a true reputable Tech in Cali who could possibly tackle this problem.
Thank you for any informative information.
long leave the G
everything started off smooth...
i had a mechanic with over 10yrs experience install the throttle bodies.
Attempted to start the car and to no success it would not start.
After hours of fiddling around with throttle body relearn procedure that's recommended after the install we got another mechanic to install the OBD2 scanner and he got to digging and found a couple of codes and corrected those but still had one left that could not be corrected (code P1233)
I was told that I needed to take the car into the dealership so that they could do a throttle body relearn program thoroughly because the car was not running correctly.
So I did just that the next day.
The technician at the Infiniti dealership told me that he attempted 3 times this throttle body relearn procedure and for some reason it won't clear (pass).
He (Infiniti dealership mechanic) with over 20yrs of experience with infinities says its the throttle bodys...
So right away I had my wife contact EPS.
She spoke with Jack and explain to him that I was at the dealership having problems with the new EPS throttle bodies.
He called me I spoke with him and I also had him speak with the technician who had attempted this throttle body relearn three times.
The conversation was unsuccessful right along with the relearn.
Infiniti at this point no longer wanted to touch the car with these throttle bodies installed.
In few words told me good luck and farewell.
Jack states that if he was there with me he would have my car running in 10 minutes with no problems. He asked what state I was in I told him Northern California and he said that he had someone that was a tech who he trusted to work on his product. And that this guy was in Southern California.
Jack says that Infiniti doesn't know what they're doing and that I need to take it to a technician that knows what they're doing SMH because the throttle bodies now need to be tuned lol SMH.
I then tell him we do not have many good techs in Northern California nor can I find one who wants to help me with this problem.
Oh and did I forget to mention that Jack said if I don't get the right tuner I will spend a lot of money trying to get these things to work.
Go ****ing figure!!!
Whos the right one!!??
I found on nico's web a gentleman on there who purchased these same throttle bodies and was having the same problems with technicians not wanting to touch these throttle bodies and the ones who did had no success in getting these throttle bodies to work properly.
I guess they didn't know what they were doing either!!!
And this guy continue to stay in contact with Jack and Jack directed him in another direction for help and there was no success there either.
This guy spent lots of money in buying these TB's and traveling back and forth from NorCal to SoCal and the ending result is him returning the product back and just receiving credit.
BS!!!
I think that he should have gotten a full refund.
If it takes a specialist to work on your throttle bodies then why are they so called Plug and Play SMFH.
At this point with so many unsuccessful attempts with these throttle bodies they should just be discontinued and no longer sold to the public due to the agony,stress and money lose they've created amongst enthusiast of the car world.
So I took the car back to the mechanic who installed the throttle bodies he took out an OBD2 scanner and check for codes and found P1233.
I looked this code up and it's referring to the throttle bodies.
I emailed Jack and let him know what was going on and the new discovery that I had found with this code P1233.
Jack says that this is typically normal,nothing to worry about his guy in SoCal can possibly solve this problem and if he couldnt solve the problem on his own Jack would assist him in troubleshooting the problems SMH.
I hit this guy up but no reply yet.
Now I must say magically the car started acting normal for only a two-week period If that that.
So with this opportunity revealing itself I took the chance on putting the car on a Dyno and I got good numbers lol, didn't last long.
I actually got 16 more horsepower yesterday and today the car went limp and my check engine service light came on.
So can I call this a success!?
Truly not!
Seeing that the day after I got my tune the same problems I had before with these TB's occurred again, which is the car going into limp mode while driving with my kids in the car.
SMH,WTF, Dangerous you think!!!
This is pretty frustrating seeing how much money I have put into these TB's and having no true success in return...
This has become a royal pain in the derriere to say the least.
z1motorsports.com EPS 70MM TB'S $800
Mechanic: friend so i paid lil to nothing $$$
Infiniti dealership: $195
Z Car Garage tune: $650...
Im not sure how all these other success stories have worked...
who worked on these cars to make them so successful with these EPS TB'S.
I would love to know this.
Does anyone know a true reputable Tech in Cali who could possibly tackle this problem.
Thank you for any informative information.
long leave the G
With those three upgrades on top of basic bolt ons my **** was scary fast