sr20 idle problem

[240ss]

I have a s13 with a black top sr20. My setup is pretty much stock, t25, 370cc inectors, fmic, walbro FP, ect. The problem is if i am driving and push in the clutch my idle drops down and usually cuts off. The problem gets progressively worse as the engine warms up. when it is trying to die i can hit the gas and hover it around 1,500-2,000 rpm for a lil and most of the time i get it to chill and idle by its self..


Also once warm it will back-fire every so often. I do not have any loss in power, and my ic piping is all tight. I am not sure if this is connected to the idle problem.

Someone has suggested my a/f ratio is off. Im in the process of getting an a/f gauge and possibly a safc? anyone have any other things i should check out?

[chris13bt]

spark plugs check em

[240ss]

i have new plugs in. i looked at all four and they are looking dry and almost white? idk what that means.. ive only driven about 75ish miles on them.

[240ss]

someone help please! this is so irritating trying to get to and from class and sitting in traffic. haha.

[ROOSEY]

hey man have you checked your maf? i had this same exact problem plus i had sputtering at about 4k. it turned out to be my maf and my fuel pump was bad so swaped it with a walbro. i thought mine was spark plugs too untill i checked the maf and that was the issue. also id check your (throttle position sensor) im not any kind of master mechanic but from problems ive had thats somewhere to start? someone correct me if im wrong about anything though but i hope this helps. good luck!!

[clay9110]

White plugs mean your running lean.

[codunc]

get a fuel pressure gauge.
stock pump?

[240ss]

get a fuel pressure gauge.
stock pump?


alright ill grab a fpg. & no its a walbro. i got it used..

[240ss]

White plugs mean your running lean.

damn! how would i go about fixing that? get a safc?

[240ss]

hey man have you checked your maf? i had this same exact problem plus i had sputtering at about 4k. it turned out to be my maf and my fuel pump was bad so swaped it with a walbro. i thought mine was spark plugs too untill i checked the maf and that was the issue. also id check your (throttle position sensor) im not any kind of master mechanic but from problems ive had thats somewhere to start? someone correct me if im wrong about anything though but i hope this helps. good luck!!


Yeah ive already switched the maf out.. if i were to change/check the TPS and air idle control vavle thing is there a way to tell if they are bad? or do i just have to replace them?

[b00sted kouki]

Check your IACV. You may need to mess witht he screw a bit, as it may be screwed out to much.

[240ss]

Check your IACV. You may need to mess witht he screw a bit, as it may be screwed out to much.


Alright thanks sir. am i going to have to take my intake mani off?

[b00sted kouki]

Alright thanks sir. am i going to have to take my intake mani off?

No worries. No you don't need to take your intake mani off. Just use a philips screwdriver to adjuste the screw.

[clay9110]

honestly get a wide band and find out what your afrs are. Fixing all these so said fuel problems when u dont even know ur afrs isnt gonna get u anywhere. Any body can just throw money and parts at a car but knowledge is what will fix your car. Please save your self alot of time and money and dont just start replacing parts that you "think" are bad.

Now to check your TPS. While full on throttle the tps transmits a 5 volts to the ecu. Remember no sensor sends more then a 5V signal to ur ecu and your stock O2 sensor transmits no more then 1V. Get a good multi meter and start checking things and adjust them as needed. Please dont be a parts thrower as youll never learn how vehicles properly operate. I promise all im trying to do is help you out dont take any of this as a bash.

[VNG704]

spark plugs check em

i have new plugs in. i looked at all four and they are looking dry and almost white? idk what that means.. ive only driven about 75ish miles on them.
check the gap on the plugs... stock setup... I'd probably go with .022-.025 of gap.