I have a 2001 S2k with a paxton supercharger and every couple of months the check engine light comes on. I have it checked and it always says "bank 4 lean." Obviously the number 4 bank is running lean. The ECU in the car knows it has a supercharger (this what I was told by the previous owner). Is this something I should be worried about? The car runs fine and just as strong. It just feels like the car is about to cut off when I go into nuetral/ come to a stop. But when the light is off, idle's perfectly fine. It does have the beefed up fuel pump that comes with the supercharger kit.
Typically it resets itself after a couple hundred miles or I reset it. Thanks!

 

What fuel management is it using? Sounds like the OEM ECU with some sort of FMU?

Have you had it on a dyno for an AFR check?

Not sure how it knows which bank is lean as there is only one lambda, but hey ho!

 

I have not had it on the dyno yet.

This is what I have http://www.inlinefour.com/cos2sukit.html

I dont think I have the ESM that comes with this kit, at least I havent found it under the hood,dash, etc.

Everything else is OEM it seems

Hope this helps you, thanks

 

It must have the ESM I think, otherwise your engine would have melted by now

It will live under the passenger footwell, where the ECU is.

I would get it dyno'd to make sure it's not lean.

The code you are getting comes from the lambda sensor so it must think it's leaner than it should be.

 

Hey, I went and got the correct codes and it reset. I was off alittle.

It had 2, error codes, I typically only get the first one. Alittle worried about the second one. What do you think?

P0171 Bank 1 to lean

P0170 Fuel Trim Malfunction, bank one

What should I do, car only has 60k on it, supercharger been on it since abt 15k. The engine light seems to only come on after long trips in the car (highway) 180miles or more.

Thank you

 

Saw this in one of the forums and it is exactly what my car does, should I get those different clamps? Any other suggestions. Just dont want to **** my car up, love the S2K.

Awhile back i noticed (1) a broken straw like leaking air sound coming from the fuel pump. (2) the fuel pump would be really loud (whining) after long drives.

The stock pinch type clamps that hold the hoses on the fuel pump don't seal as good. you should replace those w/ the bolt type band clamps like the vortech kit uses. this probably cause the fuel pump to run a lil too hard than it should or not sucking the fuel right. You could buy them at autozone for 1.00

moreover, you should NEVER drive your car hard when you see the gas light pop up, especially if your vtec'ing too. I'm not saying you did, but my car didn't like it!never again. It bogged and it was probably good enough to throw a cel overtime, but it didn't at that momemnt. I'm guessing the fuel pump w/ the crappy stock clamps on an almost empty tank of gas probably didn't have enough gas suction compensate the extra air the s/c'er puts in??? my hypothesis...

I have my denzo ik24's gapped to .030 and i even did a valve adjusment on top of that. engine feel smooth as butter

I noticed my engine used to sputter if i blimp the thottle and let it idle - it would drop past 1k then sputter then it'd be fine. Map whack did the trick, but i replaced it. i even clean the t.b. (carb cleaner) while i was at it.

uhm. what else... oh yah, definatly check the connections on the esm. i have t-taps, so i took some wrench plyers and gave them a lil pinched to ensure a better connnection.

lastly, ECU reset. Hopefully that cel will never come up again

all these suggestion might not be related, but its what i did to get rid of that cel.

 

IS the FPR set correctly? thats if your using one?

I think my mate has a similar problem and had to tweak the fpr.

 

P0171 should be obvioous: your engine is running lean.

P0170 comes on (I believe) when your long term fuel trim hits +20 or -20. It's telling you that the computer is having to add or subtract WAY to much fuel to the basemap in order for the engine to be happy. Either way, it's not good.

You don't have the fuel pump in the car that came with the kit? I'd start with putting that in first. You could try adjusting the fpr first but if the stock pump can't support that much fuel, it's not going to help.

 

I do have the fuel pump hooked up that comes with the kit. Should I adjust the screw on the top of it? Its red and billet steel. Should I change those clamps on the fuel pump on the gas tank like in the previous topic?

When you say its not good, do you mean its F-ing my car up? Am I going yo lose sleep over this?

By the way, thanks for all the help from everyone, great website!

Dont know if you can veiw this picture but here is the engine layout.

https://rumail.radford.edu/exchange/writter...23.jpg?attach=1

 

I think You're mistaking the FPR with the fuel pump. The red billet unit You're talking about is the FPR. Yes, it should have an adjustment screw on top of it.

You could try to adjust this to add more fuel, but if You're still running the stock fuel pump (in the gas tank), and it can't support what the engine needs, then turning the screw won't help.