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Thread: Stock s14a engine issues - help!

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    Stock s14a engine issues - help!

    Hi guys, having a bit of trouble with my car

    basically it revs out fine in neutral and at low throttle but as soon as i go past like half throttle the car accelerates really slowly and sounds like its misfiring

    it seems to get worse at higher revs, around 4k and up.

    also when at full throttle it accelerates slowest of all, if i let off a bit after being at full throttle it backfires and then accelerates better.

    any ideas on where to start? its a stock s14a with a questionable past so I'm slowly going through replacing everything i can afford to,
    but i'd like to solve this asap as it doesnt sound healthy. new spark plugs are on the way mainly as i dont know when they were last changed,
    but the fact it is fine when not in gear makes me think it may be something else.

    Cheers

  2. #2
    Member CrazySx's Avatar
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    Sounds like a boost leak bud. Standard you say? Original side mount intercooler are known to crack with age.

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    Sounds like a boost leak to me. Check the air intake and inter cooler pipe work and joints

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    Guest finnnerz's Avatar
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    Definitely doing the right thing by changing the plugs first. When I first got my car it was spluttery under load and turned out to be the plugs.

    Could also try running it without the MAF plugged it and see it stays the same or not.

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    Guest jj205mi16's Avatar
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    Replace your plugs and gap them properly, if it still continues it sounds like the coil packs are breaking down under load.

    Without seeing/hearing the car it is only a guess.


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    cheers guys, i'll try make a diy smoke tester for it and i'll have a look at the intercooler.

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    Quote Originally Posted by jj205mi16 View Post
    Replace your plugs and gap them properly, if it still continues it sounds like the coil packs are breaking down under load.

    Without seeing/hearing the car it is only a guess.


    Sent from my iPhone using Tapatalk
    ive ordered a set of BKR7EIX, what do i gap them to? im a bit of a noob

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    Quote Originally Posted by skint14a View Post
    ive ordered a set of BKR7EIX, what do i gap them to? im a bit of a noob
    Leave them gapped from factory for standard power. I'm running the same plugs and I'm at 1 bar and they work fine

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    Quote Originally Posted by finnnerz View Post
    Leave them gapped from factory for standard power

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    cheers man

    I'll end up chasing power like everyone else eventually but for now i just want it to run so i can fix all the boring stuff

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    Guest finnnerz's Avatar
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    Quote Originally Posted by skint14a View Post
    cheers man

    I'll end up chasing power like everyone else eventually but for now i just want it to run so i can fix all the boring stuff
    Yeah that's understandable haha, might have to close the gap a bit if you're running more boost then but I'd only start gapping then when you feel it blowing out.

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    Member CrazySx's Avatar
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    Don't gap the plugs, fit VAG coil packs. It gets rid of the weak old coil packs and gives you a solid spark regardless of gap.

    Sent from my SM-G960F using Tapatalk

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    Quote Originally Posted by CrazySx View Post
    Don't gap the plugs, fit VAG coil packs. It gets rid of the weak old coil packs and gives you a solid spark regardless of gap.

    Sent from my SM-G960F using Tapatalk
    sounds pretty neat, is there a kit for that?

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    Member CrazySx's Avatar
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    Quote Originally Posted by skint14a View Post
    sounds pretty neat, is there a kit for that?
    You can buy them, or make your own, its not that hard of you are confident with wiring and a solder iron

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    Quote Originally Posted by CrazySx View Post
    You can buy them, or make your own, its not that hard of you are confident with wiring and a solder iron

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    I could probably do it but usually when i try my own electronics it ends up as a functional eyesore blob that has no place in an engine bay lol
    I'll see what kits i can find

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    Bod for SXOC Memberships Jon's Avatar
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    Listen to this guy

    Quote Originally Posted by CrazySx View Post
    Sounds like a boost leak bud. Standard you say? Original side mount intercooler are known to crack with age.
    There aren't many 200SXs still running with their original wing mounted intercoolers. They were fragile and usually broken within a few years from new. Your initial symptoms sound to me very boost leak related.

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    Member CrazySx's Avatar
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    Thanks Jon,

    I have had all of the above. A failing coil pack, a failing fuel pump and then my favourite, a leaking DV (boost leak!)

    The symptoms defo sound like a boost leak.

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    lol are these the original plugs?

    i may be a noob but they dont look fantastic, will report back later on whether the misfire is solved or not..

    also car is very slightly over filled with oil i just discovered, changing it today along with filter but just wondered if that will have been messing stuff up? previous owner was an idiot thats for sure

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    Guest finnnerz's Avatar
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    Quote Originally Posted by skint14a View Post
    lol are these the original plugs?

    i may be a noob but they dont look fantastic, will report back later on whether the misfire is solved or not..

    also car is very slightly over filled with oil i just discovered, changing it today along with filter but just wondered if that will have been messing stuff up? previous owner was an idiot thats for sure

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    They look like they're burning okay tbh, good colour. I had that amount of blow-by after a year of my ngks as well

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    Quote Originally Posted by finnnerz View Post
    They look like they're burning okay tbh, good colour. I had that amount of blow-by after a year of my ngks as well

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    this is why i like forums lol i wouldnt really know

    but hey atleast they are changed.

    more worried about the oil, its almost 1cm above the gauge on the dipstick

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    Guest finnnerz's Avatar
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    Literally the same as mine after filling up the recommended amount. Spooky stuff hahah

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