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Thread: Fuel cut remedy?

  1. #1
    Join Date
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    Fuel cut remedy?

    So,my car is hitting fuel cut....I think.its fairly violent and only happens when Iím in the throttle fairly heavy and stay in it.at this point the car is a banshee...then pow,it falls flat if I come right back into it it comes right back on.i bought this car(1987 325 convertible)with mods already installed so now Iím trying to learn about them.it has an open compressor intake.would the addition of an air cleaner restrict air flow enough to stop the dreaded fuel cut?
    Or if that wonít work I thought maybe just put a lighter spring in my waste gate?i donít trust the gauge so Iím not exactly sure how much boost itís making but I will say this..itís plenty strong enough for me.then I could drive harder which would make me happier.anybody think this could be a viable solution?

  2. #2
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    No body?

    Quote Originally Posted by Oodlelallee View Post
    So,my car is hitting fuel cut....I think.its fairly violent and only happens when Iím in the throttle fairly heavy and stay in it.at this point the car is a banshee...then pow,it falls flat if I come right back into it it comes right back on.i bought this car(1987 325 convertible)with mods already installed so now Iím trying to learn about them.it has an open compressor intake.would the addition of an air cleaner restrict air flow enough to stop the dreaded fuel cut?
    Or if that wonít work I thought maybe just put a lighter spring in my waste gate?i donít trust the gauge so Iím not exactly sure honw much boost itís making but I will say this..itís plenty strong enough for me.then I could drive harder which would make me happier.anybody think this could be a viable solution?
    Cmon guys....is it that dumb of an idea?...Iím a newbie need help!?!

  3. #3
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    Nobody can help you if you donít give any relevant information. I saw in your other thread that you said it has a megasquirt 2 in it. Download Tuner Studio MS, which is the software you need to connect to the megasquirt. Get it connected to a laptop with a serial cable. This software will also let you record a datalog. If you start recording a datalog and go take it for a drive and make it cut out we will be able to see on the log if it is overboost cut or something else.

    Under the boost control menu you will find a setting for overboost protection. This is the setting that shuts the engine off when boost goes too high. You can change the setting or turn it off, but there is probably a reason that itís overboosting now when it wasnít before. Most likely cause is the hose going from the turbo to the bottom port of the wastegate has come off or is leaking. Youíll need to fix whatever went wrong with the wastegate or it will never work.
    Last edited by someguy2800; 01-03-2019 at 10:07 PM.


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  4. #4
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    Oh yeah...Iím a complete newbie

    Quote Originally Posted by someguy2800 View Post
    Nobody can help you if you donít give any relevant information. I saw in your other thread that you said it has a megasquirt 2 in it. Download Tuner Studio MS, which is the software you need to connect to the megasquirt. Get it connected to a laptop with a serial cable. This software will also let you record a datalog. If you start recording a datalog and go take it for a drive and make it cut out we will be able to see on the log if it is overboost cut or something else.

    Under the boost control menu you will find a setting for overboost protection. This is the setting that shuts the engine off when boost goes too high. You can change the setting or turn it off, but there is probably a reason that itís overboosting now when it wasnít before. Most likely cause is the hose going from the turbo to the bottom port of the wastegate has come off or is leaking. Youíll need to fix whatever went wrong with the wastegate or it will never work.
    Iím trying to give all the info I have.i thought maybe I needed to get these issues worked out before I brought it to a tuner.im not sure if it has been doing this cause I just got the car.im trying to get to a point I can safely make a couple hits for a tuner.as of now I canít open her up except for a couple seconds.im a millwright.i work on power generating steam turbines but I have very little experience with cars.dont know if the turbo is too big or not Iím just trying to get it running good enough to hit redline so we can get a baseline.?.i really need to be guided through this so I donít hurt the car before itís running safely.as far as hooking it up to laptop and using software....forget it Iíll have to pay someone else cause Iím clueless!sorry but thatís about the truth of it

  5. #5
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    Bima
    do you have a laptop?
    at least some info on the car damn.

  6. #6
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    No(embarassed),I don’t even have one....if I can get access then what?download studio?can a techno moron figure it out to get some basic numbers?will it make corrections automatically?and give some kind of diagnostic report?...I feel like an idiot

  7. #7
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    Info is 2.5 325 with aftermarket coil system,42 lb injectors,forged motor.arp studs,lowered compression,gt35-t70 turbo,inter cooled, car idles rough when cold,pulls hard till it hits cut.it does it at heavy throttle,tell me how to get started

  8. #8
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  9. #9
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    Quote Originally Posted by Oodlelallee View Post
    No(embarassed),I don’t even have one....if I can get access then what?download studio?can a techno moron figure it out to get some basic numbers?will it make corrections automatically?and give some kind of diagnostic report?...I feel like an idiot
    It all depends on what settings were put in the computer by the previous owner. It is capable of self corrections to the fuel table but I don’t know if the previous owner enabled that or not. There is no self diagnostics.

    As I stated above though the first thing to check is the wastegate which is mechanical not electrical. The symptoms you describe sounds like the pressure line going to the bottom port of the wastegate has come off or is damaged. Check that out first. Google how a wastegate works to start getting some familiarity with the system. Until the wastegate works properly there is nothing else you can do to the car to fix this.

    If the wastegate is functioning mechanically the best resource to figure out the computer settings is probably the previous owner, even if you have to pay them. If they built it they should know how it ticks.

    - - - Updated - - -

    Oh, and what motor is in the car, m20 or m50?


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  10. #10
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    Thanks... I will be delving into it further today....should get new valve cover gasket today.i will do valve clearance adjustment and oil change.i read somewhere they should be set at .008 to.010” with cam turned up for each one.i will look to verify this clearance but does that sound about right?i wasn’t sure if that should be set differently cause of the turbo or stick with stock clearance recommendation?...thanks a lot...and I will clean and verify waste gate functionality.also check every single hose coupling for boost leaks

  11. #11
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    bro what engine do you hhaaavee?
    just google how to adjust valves on m20.

    did it drive fine and started doing this when u bought it?
    100% it's going to be the wastegate line go check it out right now. takes 2 minutes.

    the boost gauge you say you do not trust this. Why?
    is it way higher then it was? maybe that's exactly the reason.

  12. #12
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    I took the electronic boost control out of the loop and it seems to have eliminated the fuel cut.yes!boost is lowered quite a bit.maybe they just had it cranked up too much?maybe try a manual controller?turbosmart has that switchable dual stage.set one mild and ease up on the other till I hit cut then back it off a little?...maybe I just need to go to dyno tuner now that I can open it up.?

  13. #13
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    I think you need to get a $100 laptop and download the software and start familiarizing yourself with it. A Dell D800 off ebay would do nicely.


    86 325es, 2.8L m50, S472sxe, MS3pro Ultimate, e85, solid rear axle, 4 link, spool, TH400 trans, Protorque converter, 28x10.5w slicks, zip ties
    Best = 9.43 @ 149.15 mph, 1.30 60 foot 28 psi boost

  14. #14
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    96 M3, GT4094R, Arrow Rods, CP Pistons, Elring HG, O-ring, 11 mm ARP studs,MS3pro, EMC Intercooler, Southbend clutch, ZT-2 wideband, Zionsville Radiator, X-brace, H&R springs with bilstien shocks, QTP electronic cutout, Line Locks, stock exhaust



    88 s50 m3 gt35r turbo,JE pistons, Eagle Rods, H&R springs with bilstein shocks,Ron Staygar short shifter, MS3pro, linelocks, southbend clutch

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