1.8t surge/misfire
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Thread: 1.8t surge/misfire

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    Dubber In Training VWJOEL's Avatar
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    Default 1.8t surge/misfire

    I have a MKIV GTI 1.8T that I'm having issues with surge/misfire.
    Problem has been there for a while now but is getting worse.
    It's not a constant problem it comes and goes. No codes what so ever.
    At steady rpm it seems to miss fire and when coming to a stop sometimes it feels like it wants to die. When on freeway I hit the gas and it stays at 5 psi like in limp mode.
    I let off and hit again and get full boost. I have a front mount with cold air intake, forge diverter valve, 3" down pipe and APR ecu I normally run 91 octane program. Have not yet replaced N75 valve (it's original). I was going to replace it with an Audi 034H valve. Any ideas on what my problem is?? PLEASE HELP!!!

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    No CEL?
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    CEL?

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    Check engine light
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Only code that ever comes up is my cat failure (not running cat).

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by VWJOEL View Post
    Only code that ever comes up is my cat failure (not running cat).
    I have the same issue on my 1.8t
    It's old already and have learned to accept that nothing is meant to last.
    I did the spark plugs and it runs a bit better. I also noticed today the exhaust manifold gasket needs replacement.
    If you’re in control, you’re not going fast enough. – Parnelli Jones

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by MYGTI07 View Post
    I have the same issue on my 1.8t
    It's old already and have learned to accept that nothing is meant to last.
    I did the spark plugs and it runs a bit better. I also noticed today the exhaust manifold gasket needs replacement.
    I've done all the basics and no improvement. The boost is real sloppy. Peaks and drops a lot. I'll be ordering a new n75 valve Friday so we will see how that works.

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    Quote Originally Posted by VWJOEL View Post
    I've done all the basics and no improvement. The boost is real sloppy. Peaks and drops a lot. I'll be ordering a new n75 valve Friday so we will see how that works.
    N75 is probably your best bet, but it may not help. These cars have a mind of their own.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    N75 is probably your best bet, but it may not help. These cars have a mind of their own.
    What would the car do if there was a vacuum leak?
    Could it be the wg actuator?

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    Quote Originally Posted by VWJOEL View Post
    What would the car do if there was a vacuum leak?
    Could it be the wg actuator?
    There would be little or no boost.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    There would be little or no boost.
    I've also noticed if I hit the gas fast it doesn't boost as smooth as getting in it slow.
    I never have a problem with not boosting just is sloppy.
    It holds boost fine just no power somtimes.

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    Quote Originally Posted by VWJOEL View Post
    I've also noticed if I hit the gas fast it doesn't boost as smooth as getting in it slow.
    I never have a problem with not boosting just is sloppy.
    It holds boost fine just no power somtimes.
    Change your plugs recently? Regapped them?
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Change your plugs recently? Regapped them?
    Yessir. About 5k ago. New coil packs from recal.

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Change your plugs recently? Regapped them?
    Prolly a noobish question , but how do you gap the spark plugs ? I read they have be gapped specifically when you go stage 1 and I'll be going stage 1 pretty soon

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    Quote Originally Posted by jaybru View Post
    Prolly a noobish question , but how do you gap the spark plugs ? I read they have be gapped specifically when you go stage 1 and I'll be going stage 1 pretty soon
    A gapping tool/feeler gauge

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by jaybru View Post
    Prolly a noobish question , but how do you gap the spark plugs ? I read they have be gapped specifically when you go stage 1 and I'll be going stage 1 pretty soon
    Unless I'm mistaken, factory gap is .032. I've read that as you get more aggressive with tuning you want to be closer to .028. I'm at .030 with Stage 2 and I have no misfires or problems.

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    Quote Originally Posted by VWJOEL View Post
    Yessir. About 5k ago. New coil packs from recal.
    Then I'd stick to n75 replacement and go from there.

    In the meantime you could try cleaning both the map and maf sensors.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by xcrazydx View Post
    A gapping tool/feeler gauge

    Sent from my SAMSUNG-SGH-I727 using Tapatalk 2
    Quote Originally Posted by Coltello View Post
    Unless I'm mistaken, factory gap is .032. I've read that as you get more aggressive with tuning you want to be closer to .028. I'm at .030 with Stage 2 and I have no misfires or problems.
    thanks guys , Im trying to avoid misfires and unwanted problems

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Then I'd stick to n75 replacement and go from there.

    In the meantime you could try cleaning both the map and maf sensors.
    What's a good cleaner?

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    Quote Originally Posted by VWJOEL View Post
    What's a good cleaner?
    I buy the AutoZone brand stuff, to be honest. Just make sure you give the sensors proper time to dry before reinstalling and starting the car.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    I buy the AutoZone brand stuff, to be honest. Just make sure you give the sensors proper time to dry before reinstalling and starting the car.
    Thanks for the help!!

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    Quote Originally Posted by VWJOEL View Post
    Thanks for the help!!
    Np

    Dealing with some of those same issues myself
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Np

    Dealing with some of those same issues myself
    Finally found it. Noticed when I sat in the car it bogged down a little so I went threw and wiggled all the wires in the engine compartment. Found the I had a loose connection to my MAP sensor. Glad I spend money on a new valve. Lol

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    Quote Originally Posted by VWJOEL View Post
    Finally found it. Noticed when I sat in the car it bogged down a little so I went threw and wiggled all the wires in the engine compartment. Found the I had a loose connection to my MAP sensor. Glad I spend money on a new valve. Lol
    Eh they typical go bad, plus if you ordered a newer revision it'll smooth out the boost maps.

    I'm going to be installing 2.0t coil packs tomorrow on mine.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Eh they typical go bad, plus if you ordered a newer revision it'll smooth out the boost maps.

    I'm going to be installing 2.0t coil packs tomorrow on mine.
    I didn't replace it. What's the difference between the new and old?
    What model 2.0 do the coil packs come off of? Would it better my hp?

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    Quote Originally Posted by VWJOEL View Post
    I didn't replace it. What's the difference between the new and old?
    What model 2.0 do the coil packs come off of? Would it better my hp?
    Gti, jetta, audi's. They give a cleaner spark and are less prone to inevitable failure.

    The new n75 just has a smoother boost map and could possibly bump up pressure, each car reacts differently.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  28. #27

    Default Re: 1.8t surge/misfire

    so i am new to this site as you guys can probably see i just bought my first car a 2003 gti 1.8t over a month ago and the CEL is on and im starting to think it is a vacuum leak or misfires. any idea how i would fix this? any help would be greatly appreciated


    Quote Originally Posted by boostedJTi View Post
    Gti, jetta, audi's. They give a cleaner spark and are less prone to inevitable failure.

    The new n75 just has a smoother boost map and could possibly bump up pressure, each car reacts differently.

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    Get the car scanned at your local parts store and reply back
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  30. #29

    Default Re: 1.8t surge/misfire

    so i went to auto parts and they scanned it and it said po171 and it said the probably cause is either a faulty MAF sensor a vacuum leak or a faulty heated oxygen sensor. im pretty sure it is a vacuum leak so how would i find out where it is coming from


    Quote Originally Posted by boostedJTi View Post
    Get the car scanned at your local parts store and reply back

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    Quote Originally Posted by jordan_gti View Post
    so i went to auto parts and they scanned it and it said po171 and it said the probably cause is either a faulty MAF sensor a vacuum leak or a faulty heated oxygen sensor. im pretty sure it is a vacuum leak so how would i find out where it is coming from
    Unplug the maf and drive it first. If it drives better with it unplugged, that's the problem. To find a leak you have to visually inspect the hoses...
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  32. #31

    Default Re: 1.8t surge/misfire

    so i unplugged the MAF and drove with it and it seemed alot smoother so i think it is just replace the MAF


    Quote Originally Posted by boostedJTi View Post
    Unplug the maf and drive it first. If it drives better with it unplugged, that's the problem. To find a leak you have to visually inspect the hoses...

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    I bid you good luck. I just replaced mine today as well as I was having issues.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  34. #33
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    Default Re: 1.8t surge/misfire

    I mentioned this in another thread but i never got a response. I was also having boost issues, and unplugged the maf, which didnt do anything, except turn on the traction control light? I plugged it and unplugged multiple times and each time the traction control light would turn on and off. is there any reason at all why that would happen? its really strange to me

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    Quote Originally Posted by hambone64 View Post
    I mentioned this in another thread but i never got a response. I was also having boost issues, and unplugged the maf, which didnt do anything, except turn on the traction control light? I plugged it and unplugged multiple times and each time the traction control light would turn on and off. is there any reason at all why that would happen? its really strange to me
    Electrical issues. Did you try searching vortex?
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  36. #35
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    Default Re: 1.8t surge/misfire

    Quote Originally Posted by boostedJTi View Post
    Electrical issues. Did you try searching vortex?
    Just did some searching now, some people are saying its normal? although i found a thread with a guy describing the exact same problem im having and the n75 seems to be the problem. Ive had this problem for a while and ive done a lotta searching... dunno why it took me so long to search for the maf and traction control together... found the solution in 2 mins. thanks boosted

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    Quote Originally Posted by hambone64 View Post
    Just did some searching now, some people are saying its normal? although i found a thread with a guy describing the exact same problem im having and the n75 seems to be the problem. Ive had this problem for a while and ive done a lotta searching... dunno why it took me so long to search for the maf and traction control together... found the solution in 2 mins. thanks boosted
    No worries. I will be the first to say that searching vortex only works with the right words.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  38. #37
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    Default Re: 1.8t surge/misfire

    Last question, If the N75 valve is actually whats causing my problem, which one should I replace it with. Ive looked around and it seems like the F valve is a direct OEM replacement, but i dont think they sell it anymore. So i was thinking of either going with the J or H valve. Im leaning more towards J. My car is stock, no tune or anything

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    J valve is nice.
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

  40. #39
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    Default Re: 1.8t surge/misfire

    Thanks, I appreciate the help

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    No prob
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    Quote Originally Posted by Thalo View Post
    Can't get your loose stick into top gear, eh?

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