how to lean it out?

[livinglegend2100]

so my cars been running really rich lately. smells god aweful with the windows or sunroof open. and it pops and crackles everytime i shift. most of the time when i downshift, it backfires so loud it even scares me..

is there any way i can lean it out a little without having to bring it into a shop?

[BMAR240SX]

For backfire check the the spark plug and vacuum leaks along with, intake valve deposit

[carmo]

You may want to figure out why the car decided to start running so rich. Bad oxygen sensor? Bad MAF sensor? Bad ECU? Does the car act like it has a low rpm rev limiter? Alot of the time this indicates MAF sensor. Is there any other problems? Maybe cooling fans not working due to a coolant temp. sensor reading way low which could in turn cause the ECM the think the vehicle still needs to warm up thus it dumps gas.

[livinglegend2100]

it doesnt seem to run any different than it normally does. just pops, crackles, and backfires a lot.

[Emperor_Tha]

is your car boosted? Then recirculate your bov.

[motoman399]

clean your mafs, make sure there isnt any exhaust leaks, check plugs/wires, get a new o2 sensor. bet it will fix your problem

[XTCshri2222]

safc

[livinglegend2100]

cleaned maf 1 week ago. cars not boosted. new plugs + wires 3 days ago. ill have to try a new o2 sensor.

would it be easier/cheaper to get an safc or bring the whole car somewhere? i dont need performance gains off this or anything cuz the motors comin out this winter, i just want it runnin right.

[e1_griego]

If it's not running right, safc will be a bandaid (and I'd highly recommend against, anyway).

Check for ecu codes, since it's a free check. A lot of problems with running rich stem from bad coolant temp sensors or oxygen sensors.

Alex

[livinglegend2100]

yea i think im gonna go get this shiz checked tomorrow and see if its throwin codes. hopefully its just an o2 sensor or somethin..

[ThuG LyFe]

hmm i believe i'm running rich too because it backfires when i slow down...plus i'm getting like 20 mpg. seemed to have started happening when i installed my 3" exhaust...any problem it could be that or i just didn't hear the backfire w/ the stock exhaust but it was still there?

prob. get a new o2 sensor this summer.

[livinglegend2100]

lol ya im gettin liked 16 mpg. its disgusting. i get about 270 **Km** not miles. my dash is in Km. so thats like what, 160 mi? out of a full tank of gas...

[livinglegend2100]

but im about to go get it scanned for codes right now. post up the results when i get back

[livinglegend2100]

so apparently nobody in my town has an OBD1 code reader for a nissan... this is a royal PITA... i really dont wanna buy one just to check for 2 codes..

[gtc_240sx]

you can check ur codes manually

[ken240sx]

Check out the FSM online and it will tell you how to check codes AND diagnose any problem with your engine. I read through the FSM when I'm bored lol...it's a great way to learn about your car.