Is throwing a CEL from too much fuel or not enough?
09-11-2003, 01:34 PM
#21
3.0 BAR
Join Date: Feb 2003
Posts: 9,089
Re:Is throwing a CEL from too much fuel or not enough?
HOw hard would it be to make the return lines -8an ?
So much volume going in and not much out.
thats like draining a hottub w/ a straw but re-filling it w/ a garden hose at the same time, guna over flow right.??
Just an idea cuz i know that much -8an line is expensive.
So much volume going in and not much out.
thats like draining a hottub w/ a straw but re-filling it w/ a garden hose at the same time, guna over flow right.??
Just an idea cuz i know that much -8an line is expensive.
09-11-2003, 03:22 PM
#22
1.0 BAR
Thread Starter
Join Date: May 2003
Posts: 200
Re:Is throwing a CEL from too much fuel or not enough?
Well, I left factory going back because the 87 1st gen Rex's came with 1/4" fuel line going from and coming back to the tank. I didn't think I would have to worry about it since it is a return line that doesn't carry much pressure.
Let me check my wires and I'll let you guys know. Also, can I run the "blue wire mod" from the A/F ratio meter wire? Or does it have to come straight from the ECU?
Let me check my wires and I'll let you guys know. Also, can I run the "blue wire mod" from the A/F ratio meter wire? Or does it have to come straight from the ECU?
09-13-2003, 02:03 PM
#24
1.0 BAR
Thread Starter
Join Date: May 2003
Posts: 200
Re:Is throwing a CEL from too much fuel or not enough?
Well the blue wire mod really isn't exact and .98V is about the same as .85V because the signal is not as strong and accurate with the factory O2 sensor.
Anyway, I am still throwing CEL's. At full throttle the cell comes on around 4500rpms and the EGT's soar to 1000degrees F. Normal Interstate driving at 3000rpms EGT's are 800degrees F. 3500rpms is 900-950F. The cell came on at 8psi so I tried 6psi and it still comes on.
Hi settings are
rpms
800 to 2600 -31
3000 -21
3600 -19
4000 -17
4600 -15
5000 to 5600 -13
6000 to 7200 -10
I am at sea level with temps around 90 and humidity up to 120%. Any richer and the car starts sputtering. Any suggestions?
Anyway, I am still throwing CEL's. At full throttle the cell comes on around 4500rpms and the EGT's soar to 1000degrees F. Normal Interstate driving at 3000rpms EGT's are 800degrees F. 3500rpms is 900-950F. The cell came on at 8psi so I tried 6psi and it still comes on.
Hi settings are
rpms
800 to 2600 -31
3000 -21
3600 -19
4000 -17
4600 -15
5000 to 5600 -13
6000 to 7200 -10
I am at sea level with temps around 90 and humidity up to 120%. Any richer and the car starts sputtering. Any suggestions?
09-13-2003, 09:30 PM
#27
1.0 BAR
Thread Starter
Join Date: May 2003
Posts: 200
Re:Is throwing a CEL from too much fuel or not enough?
Cel is solved. I found that I was getting a CEL from running too lean . Yeah, I know my settings mean way too rich but the AFC wasn't doing enough so I upped the fuel pressure. I am now running 8psi with no CEL but my fuel pressure is at 54psi. Yeah yeah, I know it sounds sick but it works.
It now drives very smooth. I will tune for 10psi next. I think I am getting close to maxing out the 450cc injectors. I think the T3/T4 is flowing way more air than the stock fuel pressure can handle.
New settings are
rpms Low High
800 -25 -31
1400 -36 -31
2000 -39 -31
2600 -38 -31
3000 -40 -26
3600 -40 -32
4000 -41 -34
4600 -41 -35
5000 -41 -34
5600 -38 -35
6000 -38 -34
7000 -38 -32
What is the max pressure 450cc can take?
It now drives very smooth. I will tune for 10psi next. I think I am getting close to maxing out the 450cc injectors. I think the T3/T4 is flowing way more air than the stock fuel pressure can handle.
New settings are
rpms Low High
800 -25 -31
1400 -36 -31
2000 -39 -31
2600 -38 -31
3000 -40 -26
3600 -40 -32
4000 -41 -34
4600 -41 -35
5000 -41 -34
5600 -38 -35
6000 -38 -34
7000 -38 -32
What is the max pressure 450cc can take?
09-13-2003, 11:33 PM
#29
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:Is throwing a CEL from too much fuel or not enough?
There is no way -10/-20 was too lean. You shouldn't have to up the fuel pressure. The injectors and the AFC should provide way more than enough fuel for you.
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09-14-2003, 03:18 AM
#30
1.0 BAR
Thread Starter
Join Date: May 2003
Posts: 200
Re:Is throwing a CEL from too much fuel or not enough?
Well I lowered the fuel pressure to 48psi and leaned out the injectors to -47% across the high throttle settings and she pulls like a **** BEAST 
My entire problem was that I was running too rich. Even when I smoothed the power ban with the AFC; I still wasn't making the same amount of power. Now it spins 3rd to 80mph then some of 4th and just pulls the rest of the way.
Special thanks goes out to the entire HMT board and members
for pointing me in the right direction. I owe you guys big time.
My entire problem was that I was running too rich. Even when I smoothed the power ban with the AFC; I still wasn't making the same amount of power. Now it spins 3rd to 80mph then some of 4th and just pulls the rest of the way.
Special thanks goes out to the entire HMT board and members
for pointing me in the right direction. I owe you guys big time.
