No power when Vtec hits
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Thread: No power when Vtec hits

  1. #1
    Nooblets
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    Aug 2018
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    No power when Vtec hits

    Alright so, this week I was spirit driving and all of sudden the intake noise got loud and there was no vtec power. But vtec does engage.
    I pulled over asap and checked my CAI, filter, hoses&clamps, motor oil etc. Everything looked fine.

    So drove responsible under 4k rpm car drives smooth under 4300rpm (my set vtec)(regular torque and power under 4k)
    Once vtec hits, my CAI is 4 times louder. and there is no power. but the rpm can go up if I keep on the gas, have not.

    Theres no engine light, and no error codes on flashpro.
    Theres no weird engine noises from the engine. AFM is good fuel trims are good.

    What is likely the problem?

    Vtec solenoid?
    Cam sensor?
    Fuel problems?
    Cat?
    What should I try first?

    Let me know what info you need to help solve the puzzle. Thanks.

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  3. #2
    Greenhorn
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    Slipping Clutch..?

  4. #3
    Super Mod's Pet 12FG4Rallye's Avatar
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    Quote Originally Posted by 14ADBZ View Post
    Alright so, this week I was spirit driving and all of sudden the intake noise got loud and there was no vtec power. But vtec does engage.
    I pulled over asap and checked my CAI, filter, hoses&clamps, motor oil etc. Everything looked fine.

    So drove responsible under 4k rpm car drives smooth under 4300rpm (my set vtec)(regular torque and power under 4k)
    Once vtec hits, my CAI is 4 times louder. and there is no power. but the rpm can go up if I keep on the gas, have not.

    Theres no engine light, and no error codes on flashpro.
    Theres no weird engine noises from the engine. AFM is good fuel trims are good.

    What is likely the problem?

    Vtec solenoid?
    Cam sensor?
    Fuel problems?
    Cat?
    What should I try first?

    Let me know what info you need to help solve the puzzle. Thanks.
    Do you have any oil issues? Low oil or oil pressure will cause vtec to not engage and pretty sure wont trigger a light, had that issue with my gsr back in the day. Vtec was going in and out and my oil pressure was all over the place. Who did you tune with? I would do a datalog and send it for review to see if they can see whats going on.
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  6. #4
    Nooblets
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    Quote Originally Posted by 12FG4Rallye View Post
    Quote Originally Posted by 14ADBZ View Post
    Alright so, this week I was spirit driving and all of sudden the intake noise got loud and there was no vtec power. But vtec does engage.
    I pulled over asap and checked my CAI, filter, hoses&clamps, motor oil etc. Everything looked fine.

    So drove responsible under 4k rpm car drives smooth under 4300rpm (my set vtec)(regular torque and power under 4k)
    Once vtec hits, my CAI is 4 times louder. and there is no power. but the rpm can go up if I keep on the gas, have not.

    Theres no engine light, and no error codes on flashpro.
    Theres no weird engine noises from the engine. AFM is good fuel trims are good.

    What is likely the problem?

    Vtec solenoid?
    Cam sensor?
    Fuel problems?
    Cat?
    What should I try first?

    Let me know what info you need to help solve the puzzle. Thanks.
    Do you have any oil issues? Low oil or oil pressure will cause vtec to not engage and pretty sure wont trigger a light, had that issue with my gsr back in the day. Vtec was going in and out and my oil pressure was all over the place. Who did you tune with? I would do a datalog and send it for review to see if they can see whats going on.

    Oil is full all the time. I did an oil change yesterday aswel. Oil pressure I'm not sure.
    I sent a datalog couple days ago and he got back with info. Engine running good but there is a component that's causing this problem but no real clue to what it is.
    (Everything else looked solid afm/fuel trim etc)
    Oil pressur wasn't mentioned, but said could be vtec solenoid or something blocking/clogged oil.

    So, booked apt with my mechanic, did an oil change, scanned my car and told me to drive the car normally for a couple days until he gets some parts in to find out more.
    I will ask about the oil pressure today. Ty.
    Last edited by 14ADBZ; Yesterday at 09:17 AM.

  7. #5
    Greenhorn
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    This is an Si Model correct? Hinting that you have a Manual transmission.

  8. #6
    Nooblets
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    Quote Originally Posted by Mitchapalooza View Post
    This is an Si Model correct? Hinting that you have a Manual transmission.
    My bad yes Si model manual. Clutch seems fine. Revving in neutral, still making loud noise from intake area. Although I dont know if vtec comes on when in neutral revving.. strange.

  9. #7
    Greenhorn
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    I don't believe it does.
    How many Miles?
    I believe a way to check for a slipping clutch is get into a higher gear like 4th get the RPM in at 4k & floor it. If the RPM's rise like normal but your MPH isn't going higher like it should than might be sign of a slipping clutch.

  10. #8
    Nooblets
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    Wow! Found the problem! Problem was a bad cat. That thing is totally done and coming apart! Ktuned downpipe with the 200 cell cat fyi! Thanks for the advice 9thgencivic peeps!
    scottyrocks and bfaided1984 like this.

  11. #9
    Top Dawg!! bfaided1984's Avatar
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    Quote Originally Posted by 14ADBZ View Post
    Wow! Found the problem! Problem was a bad cat. That thing is totally done and coming apart! Ktuned downpipe with the 200 cell cat fyi! Thanks for the advice 9thgencivic peeps!
    Dang that stinks, how long you had that on there?
    Whenever I'm suffering from Insomnia, I just look at a picture of a Toyota Camry and I'm straight off.
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  12. #10
    Nooblets
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    Quote Originally Posted by bfaided1984 View Post
    Quote Originally Posted by 14ADBZ View Post
    Wow! Found the problem! Problem was a bad cat. That thing is totally done and coming apart! Ktuned downpipe with the 200 cell cat fyi! Thanks for the advice 9thgencivic peeps!
    Dang that stinks, how long you had that on there?
    Yeah lol. It's been on less than a year. Great timing I think I have 1 year warranty.
    bfaided1984 likes this.

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