ka-t dies when letting off throttle

[96s14kat]

my motor keeps dieing when im driving and its reved up and i put it in neutral or push in the clutch. ever since its been turbo'd its been doing this. my bov is recirculated so i know this is not the problem. someone suggested bumping my idle up a bit. any suggestions? it only seems to do it when its higher in the revs and i let off the gas and put it in neutral or push in the clutch. its also very hard to start after it dies.

[charlie@justdrift]

Originally Posted by 96s14kat

my motor keeps dieing when im driving and its reved up and i put it in neutral or push in the clutch. ever since its been turbo'd its been doing this. my bov is recirculated so i know this is not the problem. someone suggested bumping my idle up a bit. any suggestions? it only seems to do it when its higher in the revs and i let off the gas and put it in neutral or push in the clutch. its also very hard to start after it dies.

i had the same problem before... it turned out to be my maf sensor plug.

[96s14kat]

Originally Posted by driftheaven

i had the same problem before... it turned out to be my maf sensor plug.

was the plug bad or what? im running a hacked mafs right now.

[charlie@justdrift]

Originally Posted by 96s14kat

was the plug bad or what? im running a hacked mafs right now.

no the maf wasn't bad... the plug was bad.

[96s14kat]

Originally Posted by driftheaven

no the maf wasn't bad... the plug was bad.

so the peice where the wires come together that you plug into the mafs?

[Maeda]

Originally Posted by 96s14kat

so the peice where the wires come together that you plug into the mafs?

Actually I think most of us KAT's had this problem. I solved mine by turning up the idle adjust screw located near the firewall on the passenger side.

Check around for a picture.

BTW it'll still die if I rev it to like 6 and then immediately let off. You have to master the art of 'catching' the RPM's =D

[Jeff240sx]

Originally Posted by Maeda

Actually I think most of us KAT's had this problem. I solved mine by turning up the idle adjust screw located near the firewall on the passenger side.

Check around for a picture.

BTW it'll still die if I rev it to like 6 and then immediately let off. You have to master the art of 'catching' the RPM's =D

I say it's proximity of the MAF to the turbo. JWT recommened 18" of pipe between the turbo and MAF, and my car would run like hell without that distance. Also, did you plumb the 1/4" tube and the 5/8" tube into the intake? The 5/8" to the right of the throttle body goes into the pressurized piping, and the 1/4" hose goes into the unpressurized, metered piping.
-Jeff

[96s14kat]

does the 1/4 hose come from under the TB? i just pluged that on up. i have the valve cover breather hose, and the bov recirc. hose going to the intake before the turbo and thats it. and my mafs is like a foot or less from the turbo. its all very tight. i dont have room to move it farther away.

and yea ive heard of a few other kat's w/ this problem, it just gets annoying that i have to keep my foot on the gas a lot more. when you adjusted the idle did you disconect the tps sensor(i think thats what it is) and where did you set it at? thanks.

[uiuc240]

take some pictures of your engine bay so we can see if you have all the right hoses hooked up.

Eric

[Maeda]

Originally Posted by Jeff240sx

I say it's proximity of the MAF to the turbo. JWT recommened 18" of pipe between the turbo and MAF, and my car would run like hell without that distance.
-Jeff

That might be it as well but for me the idle adjust keeps it alive enough. Next time I cut pipe maybe i'll change that(my maf is about6 inches from the turbo).

[96s14kat]

heres a few pics. im pretty sure i have the hoses right. ive got the crankcase breather and bov recirc. hose routed to the intake before the turbo and thats it. and i have the one hose coming out to the right of the TB routed to the pressurized piping(i read that jwt said to put it here.)
there was one other small hose, (like 1/4'') that used to go to my old intake before i had a turbo. it comes out somewhere under the TB. i just plugged it up.

[Jeff240sx]

Originally Posted by 96s14kat

heres a few pics. im pretty sure i have the hoses right. ive got the crankcase breather and bov recirc. hose routed to the intake before the turbo and thats it. and i have the one hose coming out to the right of the TB routed to the pressurized piping(i read that jwt said to put it here.)
there was one other small hose, (like 1/4'') that used to go to my old intake before i had a turbo. it comes out somewhere under the TB. i just plugged it up.

As I said before, the 1/4" tube goes before the turbo, after the MAF. And I'll put $5 that your problem is the placement of the MAF. You've got like 3" there.
-Jeff

[96s14kat]

Originally Posted by Jeff240sx

As I said before, the 1/4" tube goes before the turbo, after the MAF. And I'll put $5 that your problem is the placement of the MAF. You've got like 3" there.
-Jeff

yep i agree w/ you there, but i have no room to move it anywhere else. the only place i could possibly relocate it to would be down behind my IC, but i dont know if that would be good because it would be sucking all the hot air that passes through the ic.

also, what does that 1/4'' tube do? i dont see how that little hose could make a difference. i was told just to cap it off.

[240Stilo]

Jeff- Do you have that same problem with your KA-T?

I remember I had a problem like that but after I replaced battery and alternator everything was fine. But, it also only did it in the morning when I first take it out.

[mbmbmb23]

Originally Posted by 96s14kat

heres a few pics. im pretty sure i have the hoses right. ive got the crankcase breather and bov recirc. hose routed to the intake before the turbo and thats it. and i have the one hose coming out to the right of the TB routed to the pressurized piping(i read that jwt said to put it here.)
there was one other small hose, (like 1/4'') that used to go to my old intake before i had a turbo. it comes out somewhere under the TB. i just plugged it up.

I'm not sure if the S14 is set up the same as the S13, but in my S13 I have (or had) a resonator box that was under the original air-filter box (I believe its where the Injen cold air intake extension goes). Anyhow, could you refit the air filter down there, then put the MAF in the extreme corner of the engine bay (lower down to the right from where you have it currently?).

Just an idea.


-m

[Evil S14]

same thing happened to my KA-t, turns out i had a vacuum leak.

[96s14kat]

Originally Posted by mbmbmb23

I'm not sure if the S14 is set up the same as the S13, but in my S13 I have (or had) a resonator box that was under the original air-filter box (I believe its where the Injen cold air intake extension goes). Anyhow, could you refit the air filter down there, then put the MAF in the extreme corner of the engine bay (lower down to the right from where you have it currently?).

Just an idea.


-m

well that is where i have my smic mounted. i already thought about putting it down there but theres not much room behind the ic, plus i dont know if i should becuase it would be sucking all the hot air that passes through the ic.

[AceInHole]

maybe try moving the coolant resivoir and cutting/ fitting the intake through there

[Mr. Spool]

Ace where did you place your maf, I have seen them placed after the smic, before the throttle body and the second place is were he has is possitioned, right on the way into the turbo. I dont have all my turbo jarkin down, so I hope I described the places correctly. also would either of these two places affect the way the car runs.

[AceInHole]

my MAF is as far away from the turbo as possible, before the turbo (right after the air filter).

[96s14kat]

Originally Posted by Mr. Spool

Ace where did you place your maf, I have seen them placed after the smic, before the throttle body and the second place is were he has is possitioned, right on the way into the turbo. I dont have all my turbo jarkin down, so I hope I described the places correctly. also would either of these two places affect the way the car runs.

what you are talking about is the blow through type(where its located anywere in the pressurized piping), and the pull through type,(where it is before the turbo) they both do the same thing no matter where they are located(meter the amount of air going into the engine. some people mount them in the pressurized piping so they can put the bov before the mafs so they dont have to recirculate it. i didnt do it because i didnt want to have to worry about sealing the mafs w/ the ic piping.

[Mr. Spool]

Thanks for the info. which way is more effective. could you possibly aleviate your proplems by making it a push through type. also what do you mean by selling the ic. I have a side mount.

[96s14kat]

Originally Posted by Mr. Spool

Thanks for the info. which way is more effective. could you possibly aleviate your proplems by making it a push through type. also what do you mean by selling the ic. I have a side mount.

i think either way would be just as effective. i might be able to fix my problems by doing that, but since im running a hacked mafs i want it to be easy to get to and take on and off. if you have the mafs after the turbo in the pressurized piping, you have to have it sealed good so it doest leak there.