Installed 1.8 injectors.. running lean?
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I noticed when I hit 4k rpm my car starts to run lean (wideband reading 16-19). I installed 1.8 injectors because I read it's not safe running 1.6 injectors even with an FPR. The O-rings and rubber grommets are all replaced. After replacing them, I took it out for a drive and it did the same thing. I am currently running a Begi FPR and it's set at 50psi. When I blip the throttle, it drops to 47psi. Not too sure if that's normal. At idle it's reading 13.4 - 12.8(when car is warmed). What could be the problem? Fuel pump going out? Possibly injectors? Replace fuel filter? Lmk asap..
The 1.8 injectors are from a 99 miata,
Red injectors
260cc
#195500-3310
The 1.8 injectors are from a 99 miata,
Red injectors
260cc
#195500-3310
Last edited by AdoboMiata; 11-28-2012 at 10:25 PM.
#6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
and yes..I don't have an o2 clamp.
This is weird cause I never did have this problem before when I had the 1.6 injectors installed
#9
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Installed incorrectly? Isn't it the first line from the fuel rail goes in the "IN" section and then from the begi to the upper hardline? Then the 2nd line from the fuel rail to the lower hardline and gauge?
and yes..I don't have an o2 clamp.
This is weird cause I never did have this problem before when I had the 1.6 injectors installed
and yes..I don't have an o2 clamp.
This is weird cause I never did have this problem before when I had the 1.6 injectors installed
i said tuned, not installed, but now that you mention it. I'm not quite sure how you're saying you connected it.
There are two hardlines coming up. First, the hardline towards the firewall should go into the front of the fuel rail, then form the fuel rail off the FPR, the fuel line should go to the IN on the FMU, then form the OUT port it shoudl go to the hardline towards the rad.
Fuel pressure should be closer to 35psi at idle and around 45-50psi with no vacuum line connected.
#11
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
i said tuned, not installed, but now that you mention it. I'm not quite sure how you're saying you connected it.
There are two hardlines coming up. First, the hardline towards the firewall should go into the front of the fuel rail, then form the fuel rail off the FPR, the fuel line should go to the IN on the FMU, then form the OUT port it shoudl go to the hardline towards the rad.
Fuel pressure should be closer to 35psi at idle and around 45-50psi with no vacuum line connected.
There are two hardlines coming up. First, the hardline towards the firewall should go into the front of the fuel rail, then form the fuel rail off the FPR, the fuel line should go to the IN on the FMU, then form the OUT port it shoudl go to the hardline towards the rad.
Fuel pressure should be closer to 35psi at idle and around 45-50psi with no vacuum line connected.
#12
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
It's installed correctly. I double checked it. I set it to 37 at idle. When I removed the vacuum line it rose up to 39. The Begi instructions said to loosen the nut and set it up 48/50 if it's not around that range and so I did that. My wideband is reading 12.7. I'm also running the red 1.8 injectors too. hm.. must be doing something wrong?..
#15
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I guess set it back to 35?
It isn't 260cc? Well according to this website.. Fuel Injectors - Miata Turbo FAQ
#17
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
ok so 256cc. Our other wiki says 240. Anyways. 25cc isnt much. At the most you should be in the low 14s.
Whats the dead times of the 2 injectors? I ran .6 on my stockers. Are the 1.6 stock injectors any less? Doubt thats the issue.
Wait did you install the maf and all the other stock fuel controlling parts on the car the stock ecu needs to function?
I take it all you have is the FPR and the NBa injectors?
Whats the dead times of the 2 injectors? I ran .6 on my stockers. Are the 1.6 stock injectors any less? Doubt thats the issue.
Wait did you install the maf and all the other stock fuel controlling parts on the car the stock ecu needs to function?
I take it all you have is the FPR and the NBa injectors?
Last edited by triple88a; 11-29-2012 at 06:04 PM.
#18
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
ok so 256cc. Our other wiki says 240. Anyways. 25cc isnt much. At the most you should be in the low 14s.
Whats the dead times of the 2 injectors? I ran .6 on my stockers. Are the 1.6 stock injectors any less? Doubt thats the issue.
Wait did you install the maf and all the other stock fuel controlling parts on the car the stock ecu needs to function?
I take it all you have is the FPR and the NBa injectors?
Whats the dead times of the 2 injectors? I ran .6 on my stockers. Are the 1.6 stock injectors any less? Doubt thats the issue.
Wait did you install the maf and all the other stock fuel controlling parts on the car the stock ecu needs to function?
I take it all you have is the FPR and the NBa injectors?
I took it for a drive, it seems fine when I'm not hitting boost (even when the rpm is past 4) but when I hit boost (pedal to the medal) it starts to lean out.