why am i runing so rich ??

[Ghost Rider GS]

hello tuners ,
my car is runing extreamly rich, here are the details i have a 1g eclipse with a mach V rocket alpha turbo port and polished head 3" exhaust from the down pipe back 22x10x3 spearco front mount w/pipeing fluidine radiator and when i turn the car on it turnes on perfectly but idles ruff sounds like a ported rotary engine almost, the rich and lean reads rich even at idle and when i drive te car i can get to about 2000 rpm before it starts to staul .... i do have the rest of the supporting mods to this set up but i dont understand how it can be runing rich w/o any fuel mods yet ....help!!!???

 

[nine5raptor]

sounds like you have an ic pipe blown off. does it spit black smoke and barely run? check those first.

 

[turbobrian]

i would also guess a blown off ic pipe. Or maybe your timing is wacko. Did you do a timing belt job recently? You could be off some teeth.

brian
new eng dsm

Originally posted by Ghost Rider GS
hello tuners ,
my car is runing extreamly rich, here are the details i have a 1g eclipse with a mach V rocket alpha turbo port and polished head 3" exhaust from the down pipe back 22x10x3 spearco front mount w/pipeing fluidine radiator and when i turn the car on it turnes on perfectly but idles ruff sounds like a ported rotary engine almost, the rich and lean reads rich even at idle and when i drive te car i can get to about 2000 rpm before it starts to staul .... i do have the rest of the supporting mods to this set up but i dont understand how it can be runing rich w/o any fuel mods yet ....help!!!???

 

[rebuilt65]

Somethings to consider:
eliminate tuneup probs? wires plugs etc..
Injectors
was the maf hacked?
is the ecu okay?

that's all my limited hard drive can come up with
buena suerte
rebuilt

 

[L2RTSiAWD]

First question. What are you using to tune the car?
Second question. Do you have some kind of datalogger and what is it showing.

If you are running 550's and a big pump with no fuel control there is your problem.

 

[Ghost Rider GS]

ok, i thought it could be the pipeing too im going to go over all the conecting hoses carefully and also i did notice that the shop were they did my intercooling pipes did not put my blow off gasket back so i will go over every thing and check back with all of you thanks for the help and to answer some questions i dont know how my ecu is but it should be fine cause the car was fine before the mods and as for the maf sensor is there a way to check it ?? and i havnt instaled my injectors or fuel pump yet so thats not it , i have also replaced all plugs an wires (stock)

 

[nowayout]

A fuel controller will help a lot.
My ca ran like that when I hooked up my VPC wrong.

My car also ran that when I dodn't have my AFR set up correctly with the old 2G MAS setup


Lue

 

[whitegst97]

Well this thread seems to be around my topic, im running really rich, im running a 20g with a walbro 255 and the stock 450's, i have the my HI settings from 4.5k yo 7k at around -24 to -26 and the datalooger reads at some points .96 v to .98 while AFC reads .88 to .93, what is this why are these two things so different, and im boosting 17 psi, no fuel cut, how could these stock injectors handle so much, shouldn't i be in the positives in the Hi settings instead of in the negative 25's in order to run rich , and also i sometimes log a timing of 32 when the volts are at .06 at around 3.5k to 4k RPM's. Does this seem normal?? This is driving me nuts. Please any help would be very helpful and benefitial for me. one more thing how do i set the lo settings right using the short term fuel trims and long term? Thanks a lot.

 

[DSMJim]

Ghost Rider GS, please tell me you don't have a blinky light A/F gauge and your working off that? For some reason the way your describing that your running rich is what I hear from guys after they install their own Air Fuel gauge.

How exactly are you measuring that your running lean or rich?

 

[whitegst97]

I have a question, allowing more un metered air by screwing out the screw under the MAS is not noticed by the ECU right? so the car will run leaner but the ECU won't really know it, so there's really no way of measuring it, the ECU will still show 02 voltages of rich mixtures? or will you be albe to tell when logginh or reading in an AFC that the car is running leaner?

 

[kpt4321]

To the original poster:

Maybe your car just got mad because none of us can understand what you were trying to type, and decided not to run right?

Anyway... do you have bigger than stock injectors? Do you have any sort of fuel control?

This could be a boost leak. Make a pressure tester and see what happens, that solves 99% of people's problems.



whitegst97: when you undo the screw, you just increase the amount of air tha "sneaks" by the metered part of the MAS. The ECU doesn't know this and gives you the regular amount of fuel, so you run leaner (more air, same fuel = leaner). However, fuel trims should bringit back in line at part throttle.

You will see it in the O2 voltages, because they simply measure A/F ratio. The O2 sensor has no idea what the airflow looks like.

 

[whitegst97]

So the air will be noticed not by the computer but by the 02 sensor, they will show a leaner mixture right? thanks a lot for your response, this was really helpful

 

[brads]

Originally posted by whitegst97
So the air will be noticed not by the computer but by the 02 sensor, they will show a leaner mixture right? thanks a lot for your response, this was really helpful

Basically thats it. BUT, that doesnt mean that you should use that to tune the car. Thats supposed to be there to calibrate the sensor, I would just leave it alone. Having to subtract that much off with your AFC, using stock injectors, means you PROBABLY have a big boost leak.

The AFC and datalogger will probably read differently, because the AFC ground isnt referenced exactly to the same point that the O2 sensor ground is. Not unusual, I saw this slight difference in readings as well, don't worry about it.

As for seeing 32 degrees of timing when your O2 is very low, that isnt unusual if you are decelerating, or cruising. Timing is advanced a good bit under low load conditions.

Brad

 

[whitegst97]

I odn't know if the car has a boost leak, it boosts fine and it doesn't hesitate, i recently did a boost leak test, like it says in the VFAQ. One thing im not sure if your boost gauge is suppose to move or show boost, while you're testing or is it suppose to stay at zero. I put the boost leak test on the turbo compressor inlet and applied air pressure and well i didn't hear any hisss or any leak but my boost gauge didn't move either. Another thing, so you recommend that i leave the Mas screw alone? Thanks for your responses

 

[Ghost Rider GS]

im am reading of an autometer a/f guage i know its not one of the most acurate but it never acted up this bad when i had my 16g set up this is actually the 1st time i see that guage go down that far but im goin to check it out now casue the car is at the warehouse and i will let you know what i came up with by this afternoon thanx again im really starting to think its just a leak somewere along the line ..

 

[nine5raptor]

Originally posted by whitegst97
I odn't know if the car has a boost leak, it boosts fine and it doesn't hesitate, i recently did a boost leak test, like it says in the VFAQ. One thing im not sure if your boost gauge is suppose to move or show boost, while you're testing or is it suppose to stay at zero. I put the boost leak test on the turbo compressor inlet and applied air pressure and well i didn't hear any hisss or any leak but my boost gauge didn't move either. Another thing, so you recommend that i leave the Mas screw alone? Thanks for your responses

your gauge will show you the pressure in the system.

If your gauge didn't move, you didn't pressurize the system.

 

[brads]

Which boost gauge are you talking about? The factory "boost" gauge, doesnt measure boost, and would stay at zero when you pressurized the system. Any aftermarket gauge though, should show you the boost level when you pressurized the system.

Brad

 

[Ghost Rider GS]

ok, guys i did a pressure check no leaks, re tightened and inspected all couplings and clamps cranked it and same problem is there a way to check or test the maf-sensor ? or does any one have any ideas what else te situation could be ?? please get back to me asap because at the warehouse now