The 5K stutter cutout misfire stumble breakup Thread [Merged 7-8]

[Newlogics]

My project 92 Talon just wouldn't be nice to me.

I figured that my smoking problem was due to my turbo leaking oil, since upper IC pipe had whole bunch of oil in it.

Now more porblems arize....

1st: It wouldn't idle normally, instead it revs up to 2K and drops back to 1K every like 2 sec. if idle is adjusted to be lower then 1100 rpm

2nd: When rmp reach 5K under WOT, it hesitates violently. As soon as rpms drop a bit, it's fine again.

(The good thing I fix the unlock buttons, 'cause it had shaved handles and you couldn't get inside by any means except a trunk....)

 

[punkak2]

i just ordered a logger today.....it will be here this week. i'll post logs asap




Josh

 

[ddavisaf]

-Check your spark plugs. You should be running a set of NGK BPR6ES plugs gapped at .028"
-Check your spark plug wires. If they're too old they won't allow the plug to fully fire.
-Check the resistances of the coil pack's primary and seconday coil

After you've done that...

-Run a boost leak test at 20 psi. You want to hold 20 psi steady for 30 seconds or more.

 

[hellotbone]

-Check your spark plugs. You should be running a set of NGK BPR6ES plugs gapped at .028"
-Check your spark plug wires. If they're too old they won't allow the plug to fully fire.
-Check the resistances of the coil pack's primary and seconday coil

After you've done that...

-Run a boost leak test at 20 psi. You want to hold 20 psi steady for 30 seconds or more.

Well said!

 

[XakEp]

20 psi? Test it to 30 psi or more.

 

[ddavisaf]

Unless you're running 25+psi, there is no need to run more than 20 psi on a boost leak test.

 

[punkak2]

still waiting on the logger and boost leak tester.......i checked the ngk plugs and there was alot of carbon build up on them......i'm gonna replace those and see what happens...

also i want to upgrade the ignition whats a good path to go????


Thanks Josh

 

[TEAMONEINC]

What up DSM peoples..........i gotta prob with my 97 GST.

current mods

HKS mega flow intake
HKS SSBOV
HKS CFT exhaust
3inch dp.


ever since i got my downpipe installed...if i'm gettin on the gas...once i hit about 5k, my car will bog for a few seconds, then continue pulling. its sounds like a stutter.....sometimes it doesnt do it, but the majority of the time it does. its always around the same rpm...sometimes only one gear.....the car is completely driveable under normal driving but if i ever wanna remind myself of the speed, i get the problem i just told you.

do i need to upgrade my fuel injectors or do you know of anything else that could be the problem. please let me know. i miss driving my 4G and am stuck with my GT-S until i fix the problem.

 

[Ryan2ill]

Sounds like fuel cut. Try doing a search for fuel cut.

 

[jaredgsx]

Sounds like fuel cut. Try doing a search for fuel cut.

Does it sound/feel like the engine exploded, or a hard cut off of power?

from what you said it sounds like fuel cut but describe it a little more

 

[TEAMONEINC]

I dont think so...i experienced fuel cut and almost crapped my pants. This bogging isn't a huge loss in power because the car is still trying to convert the power it seems. When i hit fuel cut it felt like i left my engine behind me. This is a bogging/stuttering that once you push through it, the car runs back to normal. for example, if i hit it at 3k and it will start bogging at 5k, it will go back to normal at about 5400 or so. dont quote me on the exact numbers but thats what it seems like. it feels like i'm not getting enough fuel. this only started happening after my downpipe. i am still running stock boost and haven't touched that yet. i would like to fix this problem first before i decide to do anymore upgrades that will worsen the situation. it feels like when you are cutting the grass...and you hit that huge pile of wet grass and the blade can't cut through it with the same power...so you lift the mower up and the blade goes back to normal...if you can imagine that sound/feeling, then its sorta similiar to this. let me know what ya think.

 

[jaredgsx]

how old are your plugs and wires

 

[Whiplash]

I have a problem which sounds the same as what you are having. I also have a leaky injector.

 

[jaredgsx]

well here is a quick list of things to check

*boost leak test*
-plugs
-wires
-Timing
-shaft play in the turbo
-cloged injectors
-bad mas

 

[Catbox_95]

well here is a quick list of things to check

*boost leak test*
-plugs
-wires
-Timing
-shaft play in the turbo
-cloged injectors
-bad mas

All boost leak will do is make him not have as much boost, at any rpm, and at all rpm. His symptoms are nothing like that. Doesn't sound like boost leak. Plugs, maybe, possibly. Doesn't sound like wires. How can he adjust timing? Doesn't sound like shaft play in the turbo, or anything with the turbo for that matter. Possibly clogged injectors. Possibly bad MAS.

The fact that it does it briefly, intermittently, and then clear out eliminates the possibility of any kind of turbo or boost leak problems. Sounds more like a fuel issue to me. Let's remember that he said it started doing it after the 3" downpipe. This is allowing the turbo so spool up much faster, and the entire fuel system is stock. Perhaps then there is too much boost for the stock injectors/fuel pump at that certain rpm, because then maybe he breaks through that temporary dead spot when the fuel pressure increases due to increased boost.

Also, if your plugs are bad, they might not be able to handle the boost/fuel or boost/lack-of-fuel at that certain rpm, and then it clears up. The plugs are an easy fix, so try them first. I would focus your attention on a fuel issue, or possibly fuel not being all burned due to bad plugs.

 

[TEAMONEINC]

thanks alot guys. i'll start with the plugs.

 

[jaredgsx]

All boost leak will do is make him not have as much boost, at any rpm, and at all rpm. His symptoms are nothing like that. Doesn't sound like boost leak. Plugs, maybe, possibly. Doesn't sound like wires. How can he adjust timing? Doesn't sound like shaft play in the turbo, or anything with the turbo for that matter. Possibly clogged injectors. Possibly bad MAS.

The fact that it does it briefly, intermittently, and then clear out eliminates the possibility of any kind of turbo or boost leak problems. Sounds more like a fuel issue to me. Let's remember that he said it started doing it after the 3" downpipe. This is allowing the turbo so spool up much faster, and the entire fuel system is stock. Perhaps then there is too much boost for the stock injectors/fuel pump at that certain rpm, because then maybe he breaks through that temporary dead spot when the fuel pressure increases due to increased boost.

Also, if your plugs are bad, they might not be able to handle the boost/fuel or boost/lack-of-fuel at that certain rpm, and then it clears up. The plugs are an easy fix, so try them first. I would focus your attention on a fuel issue, or possibly fuel not being all burned due to bad plugs.

I have always found it good to check those things that i listed. You never know problems come from all of those sorces a lot when problems do appear

 

[Cool Mr Steve]

All boost leak will do is make him not have as much boost, at any rpm, and at all rpm. His symptoms are nothing like that. Doesn't sound like boost leak.

I'm going to have to completely disagree with you on that one... If he has a boost leak it will cause his car to run rich and could cause exactly the symptoms he is describing. I have had boost leak stutters on several occasions and I'm sure many of the members on here can back me up. Check for boost leaks, as well as your plugs and wires. Good luck.

 

[VegasTSI]

I am actually having this same issues with my 95 tsi awd

It started after I installed my 3'' downpipe/catback

If I don't floor it its fine, but If I lay into it . it will "bog" down , kinda like a sputter.... does it once twice, mabye three times then keeps goin.... I don't know what it is

I think I also have a blown headgasket though , might be because of that..

 

[1993TalonTsiAWD]

I am actually having this same issues with my 95 tsi awd

It started after I installed my 3'' downpipe/catback

If I don't floor it its fine, but If I lay into it . it will "bog" down , kinda like a sputter.... does it once twice, mabye three times then keeps goin.... I don't know what it is

I think I also have a blown headgasket though , might be because of that..

So your just driving around with a blown HG? get that fixed, although I don't think thats what you have if you can still drive it around.

People check your plugs and wires NGK all the way 7 or 6 heat range depending on your boost level. and gap them to .028

Derek

 

[Norcalrallyist]

All boost leak will do is make him not have as much boost, at any rpm, and at all rpm..

My system can only hold 4psi with a leak tester but I can still get 15+psi. You would have to have a huge leak to loose boost at all rpms. Im working on fixing my boost leaks now. My car runs like crap and im sure its the leaks. I would recommend making a boost leak tester to anyone regardless of their problem.

 

[Dream On]

My car had something similar. I would floor it, and then once the rpms got to about 5k, they just stopped for a second, then continued. My problem ended up being a slipping clutch, which was made more obvious in the coming weeks/months. Good luck.

 

[Jhoe]

I changed the head gasket and put her back together and now all I get is between 10-15psi max and stuttering from the 5-6k region. Checked the lines and put pressure on the intake piping to check for leaks, seems to be fine. Fuel pressure is 39 with the vacuum off. The PCV valve was replaced as well (one from Autozone). Plug wires and plugs are a bit old but never gave me a problem before the change. I am not knocking when I hit it either. Any suggestions on what to check? Thanks for the diagnosis!

 

[JiggahMan]

I have to say boost leak test because of the stuttering. Are you using the same tune you had before? What are you using to tune? My guess is rich; whether it's because of a boost leak or a bad tune, I don't know.


Also, a log would be great.

 

[Jhoe]

Redid all the vacuum lines and checked the AFC.... Wow well appearently my sister though my AFC in my ceiling was some sort of game (what the hell?) that she couldn't figure out how to work, like 5k to 7k on the damn thing were set to about +30% corretion. The world is out to see this thing not run I swear. Pulls like a raped ape again thanks!

 

[spyderturbo007]

Now you know why they allow you to set a password.