question about air fuel
#1
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
question about air fuel
I had a question about air fuel for an 87 na.
If you adjust the variable resistor screw besides the pressure sensor all the way to the left, could that give you poor gas mileage?
I know it'll make you run a little rich, but could it make the fuel pressure too high.
I'm not sure if thats whats giving me poor gas mileage. I already did a search, and did not find answers to these specific things I am asking.
Thanks.
If you adjust the variable resistor screw besides the pressure sensor all the way to the left, could that give you poor gas mileage?
I know it'll make you run a little rich, but could it make the fuel pressure too high.
I'm not sure if thats whats giving me poor gas mileage. I already did a search, and did not find answers to these specific things I am asking.
Thanks.
#4
Rotartist
![](https://www.rx7club.com/images/misc/10_year_icon.png)
iTrader: (13)
Join Date: Sep 2003
Location: Spring Hill TN 37174
Posts: 7,252
Likes: 0
Received 2 Likes
on
2 Posts
Checked the o2 sensor lately? Changed the intank fuel filter? Out of tank one? Is your TPS set? Whatabout a clogged cat? check these things first then go from there, vacume leaks...ect..
#5
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Alright, thanks for the help. But you guys are pretty sure that setting my variable resistor won't lean out my mixture just a little, and restore som e of that gas mileage?
#7
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
ok, when I have time hopefully this weekend or next, I'll try checking these things. Until then, where should the variable resistor be set. I know it barely turns like 270 degrees from left to right with a screwdriver, kinda like 3/4 a full circle. Wheres the ideal place to set it? Right in the middle, like not to rich, not too lean, or a little rich, or a little lean?
Trending Topics
#8
Well, unfortunately its not that easy. That resistor screw, along with timing and the air mix screw, all determine idle speed. And to go into specifics about it would take all day. For a quick setting, just move the screw till the idle smooths out. BTW, make sure your ISC connector is jumpered or your wasting your time.
Got an idea. Download the FSM from www.FC3s.org . 4A or 4B depending on your model has all the information on this procedure.
-J-
Got an idea. Download the FSM from www.FC3s.org . 4A or 4B depending on your model has all the information on this procedure.
-J-
#9
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Alright. So i finally got around to changing the fuel filter, the one under the hood, yet i can still smell fuel when i turn the car on and drive. I am going to change the o2 sensor next. Hopefully that will be the end of my poor gas mileage. If not, and i still smell gas, I will try to check out those fuel injectors for faulty gaskets, and what not. I doubt that the fuel lines would have any leaks, but you never know. Has anyone ever had a leak in their fuel lines before? If so, how did you go about fixing it?
#11
Despise Enmity
![](/images/misc/20_year_icon.png)
Join Date: May 2001
Location: Richmond, VA
Posts: 2,420
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by rx7henry
Alright. So i finally got around to changing the fuel filter, the one under the hood, yet i can still smell fuel when i turn the car on and drive. I am going to change the o2 sensor next. Hopefully that will be the end of my poor gas mileage. If not, and i still smell gas, I will try to check out those fuel injectors for faulty gaskets, and what not. I doubt that the fuel lines would have any leaks, but you never know. Has anyone ever had a leak in their fuel lines before? If so, how did you go about fixing it?
Alright. So i finally got around to changing the fuel filter, the one under the hood, yet i can still smell fuel when i turn the car on and drive. I am going to change the o2 sensor next. Hopefully that will be the end of my poor gas mileage. If not, and i still smell gas, I will try to check out those fuel injectors for faulty gaskets, and what not. I doubt that the fuel lines would have any leaks, but you never know. Has anyone ever had a leak in their fuel lines before? If so, how did you go about fixing it?
Next up would be the o-rings on the injectors themselves.
Is your charcoal canister (near the pass fender/firewall) still connected?
#13
Despise Enmity
![](/images/misc/20_year_icon.png)
Join Date: May 2001
Location: Richmond, VA
Posts: 2,420
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by rx7henry
Are you suppose to fix or replace the pulsation damper?
Are you suppose to fix or replace the pulsation damper?
#15
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Goddamn, I called mazdamasters today, and they said it would cost about $400 dollars in the end including parts and laborto fix the pulsation damper. Thats way too damn much.
#16
Despise Enmity
![](/images/misc/20_year_icon.png)
Join Date: May 2001
Location: Richmond, VA
Posts: 2,420
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by rx7henry
Goddamn, I called mazdamasters today, and they said it would cost about $400 dollars in the end including parts and laborto fix the pulsation damper. Thats way too damn much.
Goddamn, I called mazdamasters today, and they said it would cost about $400 dollars in the end including parts and laborto fix the pulsation damper. Thats way too damn much.
rofl.
Download the FSM from www.fc3s.org and do the work for free.
#17
Ancient n00b
![](https://www.rx7club.com/images/misc/05_year_icon.png)
Thread Starter
Join Date: Oct 2003
Location: sj, ca
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
After installing a new fuel filter, there is a difference. I'm getting about 15 mpg. Thats better but still not good. I can swear I smelled gas from near the passengerside rear, below the gas lid. Where do you guys recommend getting your rotaries serviced, because I think I want this problem diagnosed.
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
12abridgeport
1st Generation Specific (1979-1985)
2
08-17-15 06:28 PM