Jump to content
SAU Community

Need Help Please... Runs Lean For No Reason

Draconis

By Draconis,
in Engines & Forced Induction

 Share

Recommended Posts

Draconis Enthusiast

Draconis

Posted
Posted

Okay, this has been going on for a couple weeks and during this time I havent figured anything out nor any pattern.

I'll be driving like normal... not boosting or anything. I guess you can say like 40 mph or something. Then all of a sudden it will run lean for no reason and of course there's a loss of power. It usually catches itself. Sometimes it takes a second or two but then back to normal. Worst case is that it loses all power so I pull into a parking lot, leave the car in neutral and it catches back to normal.

Here's what happened today. I was driving and down shifted to second, came to a rolling stop then started up again. As I started up from my rolling stop there was a bit of hesitation then it was ok. About 20 feet away it did the same thing... this time I pulled over and shifted to neutral but it died by the time I did this. I started up and everything was ok. I drove for about four blocks and the thing runs lean again. I step on the gas a little and it only does worse by making the car jerk. So as the car rolls, I drop the car to neutral and suddenly and my AEM Uego immediately swings to rich. I shift back to gear and it is fine then dies shortly after being too rich... I think it was too rich... I didnt catch the reading on the Uego for I was in traffic. It died so I just turned the key to off then started up the car and it was fine the rest of the way without issue.

I have changed out the O2 sensor a couple days ago. I changed the fuel filter in August.

I have a RB20DET with stock ecu. Plazmaman intake plenum, HKS SSQV Bov, Tomei 256/8.5 lift cams, top mount stainless steel exhaust mani, T3/T04e, Tial wastegate 38mm, FMIC, stock injectors, Splitfire coils packs, Greddy Type S boost controller (off) and a Neo (+4% on high boost at 6000rpm and up).

Any ideas? Like I said before, it doesnt happen all the time. I drove to work and there was no problem. The temp. when this happens varies... no rain or moisture coming down. I am confused.

Thanks.

R32_Matt Rising Star

R32_Matt

Posted
Posted

id probably look at getting bigger injectors and fuel pump with the retune as well.

as for the problem, afm, fuel pump and fuel filter are the first things that i would look at

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      Torana Lx Gtr Hatch, Lots Of Pictures

      By The Bogan · Posted

      LOL, when one "money pit" is never enough Noice, and excellent work mate
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I have more than enough digging, laying blocks, moving gravel, airrating, feeding and top soiling the grass, and setting up the veggie gardens growing some seedlings,  and then removing all the unused rock to keep me busy for the next few months at least,  hopefully the rain stops soon so I can get a few hours in this arvo, but, before that Sunday is washing day, is every body happy, you bet your life we are Nice country road day drives are a day off whenever I'm muscle sore from all the landscaping at the moment, but, more epic multiple day drives will start once the majority of the big jobs outside are completed
    • MBS206
      NC MX5

      By MBS206 · Posted

      I hear that would involve some nice country road drives into the hills for Mark...
    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
×
×
  • Create New...