Sup fellas. Don't know if this is the right place to post since I never had this problem. So since I had the FC It has been running rich as hell, wideband gauge marks 10.6 idle and it's stead up to 6k rpm it goes as low as 8.9. removed the his f con ECU and left the stock one. Still the same. I'm getting about 6-7mpg. It's a pretty much stock motor with a street port, stock Injectors purple tops, greedy top mount, knights sports hybrid turbo, 3in down pipe to stock exhaust. Fuel pump is from a FD, it's a 88 s4. What should I check, spark plugs are new. With NGK wires, car drives good, just the exhaust smells like nothing but gas.

 

when you mention purple top injectors, are you sure they aren't the 720cc denso/Greddy injectors? does your '88 have a resistor pack near the airflow meter?

 

^^ if you want to check the O2 sensor there is a port you can plug a voltmeter, and or LED into, and watch it, work, or not

 

i doubt the O2 sensor is a cause, it works in such a narrow range that it would only be affected a very small amount of the time.

most likely causes:
a faulty AFM
high fuel pressure/rewired fuel pump
oversize injectors
sticky semi clogged injectors
faulty ECT sensor

or some sort of hack to the engine controls that the owner hasn't found yet.

the fact it has a hybrid turbo and is still running leads me to believe it isn't running stock injectors, or someone fiddled with the airflow meter internally and reclocked it. fixing this issue may wind up being a bad idea, you might be wiser to invest in a standalone EMS instead, it will save you gas in the longrun.

 

Well I'm assuming they are the 550cc sensor injectors, they look like another set I have from a J spec S5 motor. The resistor box has 5 wires from it and it's in the lower part by the air meter? Then yes I have that too

 

Yeah that makes sense. Would driving the car like that be a bad idea? Last think I need is the motor blowing up lol.

 

this is what the resistor box looks like, if you have it then you shouldn't have purple top injectors:

 

Yeah that's the one. Anything you recommend me to do? Should I get the proper ones? Or can I delete the resistor box?

 

what you need to do is check the injectors to see what they actually are. the injectors should have a part number on them. if the part number is ground off then they are likely modified larger injectors.

 

Sup guys. Sorry been busy with life lol. Soo I been fiddling with the car, recirculated the bov, checked for vacuum leaks, bypassed the resistor pack, new o2 Sensor, found out the factory a/f mixture sensor is bad. Checked the injectors and they are the factory 550c and the item number is there, made by denso. How can I check if my Maf was messed with?

 

Bump. Changed the Maf nothing.. found out I got a S5 primary fuel rail, also replaced the water temp sensor and nothing. Also my a/f ratio stays the same as when it's super cold in the morning. Shouldnt it lean out a bit after it's warm up?

 

Bad/overwhelmed fuel pressure regulator?

 

i can't think of anything else, got better things to do than try to figure out everyone else's problems besides my own.

 

A little frustrated today are we? ;-)

 

Post the injector part number written on the side to determine whether your injectors are high or low impedance.

 

1370 they are the purple tops 550cc.

 

​​​thats what I'm thinking, also when I take my intercooler off I smell gas in there bad. I was going to send my injectors to RC and hope that helps!

 

Make sure you have a good connection to and a working engine coolant sensor (the one on the back of the water pump.

If that has has a bad connection or isn't working you will get full cold start enrichment all the time (ECU default).

 

thats right! i was told the same about the air temp wiring, ill check it and hope its good, thanks

 

I know this post but for future reference my problem was the FPR. It was leaking through the vacumm line nipple. So its like in had 5 injectors lol,

 

Thanks for coming back with the update on this.

Glad you were able to find that!

 

+1^^^^^

 

No problem guys. Like a lot of guys out there, I also rely on this page for info and struggle when nobody posts a solution lol

 

Check your fuel line pressure.... nevermind, overlooked some posts. So you were leaking gas under the hood? That's scary haha.