Hey guys, just got my 95 civic hatchback this week and I think something may be a bit off here. My car idles very rich, like the guage is almost if not all the way to the rich. When I'mstepping on the gas it runs rich, with about half throttle it is around stoich but still a little bit on the rich side. When I let go of the gas completely it goes all the way lean. I was told this is because you aren't giving the engine any gas so it runs lean, is this normal and is it bad for the engine?
Just so you know i have the JDM d15b vtec and 14b turbo. I don't know much about cars in general so I'm just trying to figure out as much as I can. The guy I bought the car had the "low cam" tuned on a dyno but not the "high cam". What is low cam and what is high cam, i think he said high cam is where vtec kicks in. Could someone please give me as much information as possible it will be greatly appreciated!
Thanks Guys

 

what kind of air/fuel ratio gauge are you looking at? does it have numbers displayed on it or just a little lights desplay that goes back and forth real quick?

 

It is a Cobalt and it says on it Autometer. This is it here:

And there is like a light that will go around the guage to indicate how it is running.

 

if its not a wideband i wouldnt trust it, the narrow band a/f gauges bounce all over (or so i've heard)

and as for the cam, adjusting the high cam would adjust VTEC engagement point right? I wouldnt mess with that if i were you, keep VTEC at the stock engagement point

 

It doesn't bounce all over the place, it seems to be accurate. Do you know if it is bad if when i release the throttle all the way it goes all the waylean? Isn't it normal for turbo'd engines to run a little bit rich when your driving? I'm just worried about the lean when I let go of the gas.

And about the high cam your talking about, I dont even know what it means. Iwouldn'tmess with it butI wanted to bring it to a mechanic for them to tune the engine and the guy I bought it from said he had the low cam dyno tuned and suggested I get the high cam tuned aswell. Wouldn't this be better for the engine to get it tuned?
Thx

 

It is not going to instantly go back to stoich if you slap the throttle plate shut. Are you running a FMU?

 

adjust the fuel screw on the throttle body.... its on the top left side of the throttle body and it faces the pass. side tire, its gold colored and adjust it via flat head screw driver.... good luck

 

Tell me you're joking....

 

Sorry I don't know, what is an FMU?
Edit: Searched it up, you must mean fuel management unit. I'm not sure, how can I tell?

 

Do you have a mod list for the car, or even some engine bay shots? It's actually quite terrifying to think that you're driving around in a boosted car with little to no knowledge of the setup. If your car is tuned properly for boost, you shouldn't be fully into lean or rich, there is a happy medium.

Give us as much detail as possible on the car, the motor, and the turbo setup so we can get this diagnosed.