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Engine raising fuel pressure....how??

Discussion in 'Powertrain' started by CorollaULEV, Oct 15, 2004.

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    CorollaULEV Guest

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    raising fuel pressure....how??

    I removed the AEM CAI b/c of it causing a lean mixture and some severe detonation between 2000-3000 rpms @ anything more than 1/2 throttle. An SAFC would probably fix this, but I'm looking at other options.

    How could I raise the fuel pressure? Are there fuel pressure regulators I can buy for this car to raise fuel pressure? What other components could I buy to raise the fuel pressure? What are the options here??

    Thanks,
    Trav
    CorollaULEV, Oct 15, 2004
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    matadorCE Guest

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    I don't think just an intake should make you run so lean that the ECU can keep up, but I'm no expert. It's not like you're cramming air in with a turbo or a s/c. Are you sure your fuel system is working okay?
    matadorCE, Oct 15, 2004
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    Killercocopuff New Member

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    i'm thinking maybe fuel rail, fuel pressure regulator, minjdstors better fuel pump. those are ways
    Killercocopuff, Oct 15, 2004
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    vortex Well-Known Member

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    what year is this car? if it's MAP - there is no reason why it should have done this. If it's MAF - it's possible you damaged the sensor while installing it to the CAI. That could definitely cause you to run lean as the car wouldn't have a clue about the amount of air it was getting and could possibly think its getting none, thus running you lean.
    vortex, Oct 16, 2004
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    superpilun Guest

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    dude Trav, something is wrong with your car, or your intake, or both. diagnose the problem, and then fix it.
    superpilun, Oct 16, 2004
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    System Error Guest

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    you can't use a FPR for our cars I don't think........no return line!
    System Error, Oct 16, 2004
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    CorollaULEV Guest

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    It's a 2003 Corolla. It has the heated wire MAF sensor. No MAP sensor. Damage the MAF sensor??? I kind of doubt that. Makes no sense why it would work fine with the stock intake, but lean out with the CAI. Like I said, I think it's just an issue of the MAF sensor getting an incorrect reading. Design flaw in the CAI, I think.

    The stock intake has the mesh to straighten out the air current so the sensor gets an accurate reading. The CAI doesn't have that. I believe that's the issue in a nutshell.

    Trav
    CorollaULEV, Oct 16, 2004
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    vortex Well-Known Member

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    musta misread that first post, i thought you said you still had problems after you pulled it out... *shrug* dunno what to tell ya however - i would definitely think *SOMETHING* is wrong around the MAF being that you're running so lean - its not like the CAI gives you above atmospheric pressure - hehe :)
    vortex, Oct 17, 2004
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    matadorCE Guest

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    then get the TRD intake or something besides the AEM. if you're sure that your fuel system doesn't have problems (since you say it works fine with the stock airbox), then get rid of that intake.
    matadorCE, Oct 17, 2004
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    Monster1ZZFE Guest

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    My AEM runs just fine on my car. How are you testing the A/F ratio in the car with the AEM on vs the Stock?

    Some intakes for Mustangs cause more of a rich mixture than lean to the point of detination.
    Monster1ZZFE, Oct 17, 2004
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    CorollaULEV Guest

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    How I'm testing? I'm not. Call it intuition and process of elimination. What else would cause abnormal combustion b/w 2000-3000rpms @ 1/2-full throttle? Surface or hot spot ignition from carbon deposits would be helped or cured by fuel system cleaners AND would also exist with the stock airbox. This would also cause ignition very early in the compression stroke, causing poor performance and most likely wouldn't just exist in the narrow rpm range of 2000-3000 rpms. If it were compression related, i.e., preignition due to spark advance, then high octane fuel would help or eliminate it, not to mention that the ECU would retard timing based on knock sensor input as a function of crank angle and would also occur at other rpms. The only choice left is postignition due to very high combustion temperature cause by a lean mixture. I also noticed some heavy NO odors from the exhaust, which would also suggest high EGT's. Chances are that retarding the timing slightly would have helped with this, but the ECU doesn't know that.

    How can a rich mixture cause detonation? Extra fuel cools combustion.

    Late,
    Trav
    CorollaULEV, Oct 17, 2004
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