KA sputtering at 4000 rpm!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

matysik27 · 12-26-2008, 02:24 PM

I've got a 1991 240 with a dohc ka and just freshly rebuilt with new internals. Now the only problem is that it hesitates to start and pops and spits from 1000 to 1500 rpm then smooths out fine until 4000 then sputters and wont go higher than 4000 rpm unless you feather the throttle. Anyone know what could be wrong?

The only thing not stock would be that i have a Z32 mass air flow sensor

matysik27 · 12-26-2008, 03:06 PM

anyone at all?

Bigsyke · 12-26-2008, 03:07 PM

Code 34? Knock sensor bad.

Disconnect subharness and stuck a 1megaohm resistor in there, it should smooth out past 4k.

Z32 mafs? Dont you need a tune for that?

matysik27 · 12-26-2008, 03:12 PM

Quote:

Originally Posted by Bigsyke

Code 34? Knock sensor bad.

Disconnect subharness and stuck a 1megaohm resistor in there, it should smooth out past 4k.

Z32 mafs? Dont you need a tune for that?

it was doing this even when i had my stock MAF too though. i switched thinking this would solve the problem and now nothing has changed

Felipe · 12-26-2008, 03:12 PM

is your check engine light on

matysik27 · 12-26-2008, 03:14 PM

Quote:

Originally Posted by Felipe

is your check engine light on

nope hasnt been on at all

Bigsyke · 12-26-2008, 03:15 PM

again man pul the codes, check for the KS code

irax · 12-26-2008, 03:15 PM

Quote:

Originally Posted by matysik27

it was doing this even when i had my stock MAF too though. i switched thinking this would solve the problem and now nothing has changed

soo... wait.. if you have a stock maf and it did this with the stock maf why did you 'upgrade' to the z32? doesnt make sense. I would of solved the problem first.

Is the dist. new, rebuilt, or old? did you test the injectors? did you test the signal to the tps?

matysik27 · 12-26-2008, 03:17 PM

Quote:

Originally Posted by irax

soo... wait.. if you have a stock maf and it did this with the stock maf why did you 'upgrade' to the z32? doesnt make sense. I would of solved the problem first.

Is the dist. new, rebuilt, or old? did you test the injectors? did you test the signal to the tps?

because i had it laying around and thought this might solve the problem. injectors test fine and didnt test the tps.

matysik27 · 12-26-2008, 03:36 PM

ill try to pull the codes. the ka can run without a knock sensor right?

matysik27 · 12-26-2008, 04:17 PM

i pulled code 55

FWD LOL · 12-27-2008, 04:17 PM

im suprised the car even runs with that MAF. you need to get a tune or an afc to calibrate that maf- clean the stock one and put it back on- you dont need a 300zx unit unless you are making better than 260hp. which you wont do without a turbo/ forced induction.

matysik27 · 12-28-2008, 10:08 PM

Quote:

Originally Posted by FWD LOL

im suprised the car even runs with that MAF. you need to get a tune or an afc to calibrate that maf- clean the stock one and put it back on- you dont need a 300zx unit unless you are making better than 260hp. which you wont do without a turbo/ forced induction.

got a new stock MAF and now it runs butters. thanks for all the fast responses

irax · 12-29-2008, 03:54 AM

did you look up what code 55 was? do you need an fsm?

matysik27 · 12-29-2008, 08:51 AM

Quote:

Originally Posted by irax

did you look up what code 55 was? do you need an fsm?

code 55 means there are no codes to be viewed

CrazyKoukiS14 · 12-29-2008, 04:43 PM

i had the same problem, get a tune up done on your car and you should be fine, my problem was my spark plug wires, get some NGK's and its smooth sailing from there

matysik27 · 12-29-2008, 04:48 PM

Quote:

Originally Posted by CrazyKoukiS14

i had the same problem, get a tune up done on your car and you should be fine, my problem was my spark plug wires, get some NGK's and its smooth sailing from there

everything was brand new so it already "had" a tuneup. anyways i got a new stock MAF and it runs fine now so thanks anyways though.

CrazyKoukiS14 · 12-29-2008, 04:58 PM

yup no problem

12-26-2008, 02:24 PM	#1
matysik27 Join Date: Dec 2008 Location: Millerwaukee Age: 31 Posts: 36 Trader Rating: (1) Feedback Score: 1 reviews	KA sputtering at 4000 rpm!! I've got a 1991 240 with a dohc ka and just freshly rebuilt with new internals. Now the only problem is that it hesitates to start and pops and spits from 1000 to 1500 rpm then smooths out fine until 4000 then sputters and wont go higher than 4000 rpm unless you feather the throttle. Anyone know what could be wrong? The only thing not stock would be that i have a Z32 mass air flow sensor

12-26-2008, 03:12 PM	#5
Felipe Post Whore! Join Date: Feb 2008 Location: No pues wow Posts: 2,959 Trader Rating: (9) Feedback Score: 9 reviews	is your check engine light on __________________ Late Night Crew #1

12-29-2008, 03:54 AM	#14
irax Post Whore! Join Date: Aug 2003 Location: San Diego Age: 37 Posts: 4,248 Trader Rating: (4) Feedback Score: 4 reviews	did you look up what code 55 was? do you need an fsm? __________________ Drives a BRZ and is building a V6 S12 coupe.

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12-26-2008, 03:06 PM	#2
matysik27 Join Date: Dec 2008 Location: Millerwaukee Age: 31 Posts: 36 Trader Rating: (1) Feedback Score: 1 reviews	anyone at all?

12-26-2008, 03:07 PM	#3
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 36 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	Code 34? Knock sensor bad. Disconnect subharness and stuck a 1megaohm resistor in there, it should smooth out past 4k. Z32 mafs? Dont you need a tune for that?

12-26-2008, 03:15 PM	#7
Bigsyke Zilvia FREAK! Join Date: Jun 2008 Location: NA Age: 36 Posts: 1,342 Trader Rating: (0) Feedback Score: 0 reviews	again man pul the codes, check for the KS code

12-26-2008, 03:36 PM	#10
matysik27 Join Date: Dec 2008 Location: Millerwaukee Age: 31 Posts: 36 Trader Rating: (1) Feedback Score: 1 reviews	ill try to pull the codes. the ka can run without a knock sensor right?

12-26-2008, 04:17 PM	#11
matysik27 Join Date: Dec 2008 Location: Millerwaukee Age: 31 Posts: 36 Trader Rating: (1) Feedback Score: 1 reviews	i pulled code 55

12-27-2008, 04:17 PM	#12
FWD LOL Join Date: Dec 2008 Location: columbus oh Age: 32 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	im suprised the car even runs with that MAF. you need to get a tune or an afc to calibrate that maf- clean the stock one and put it back on- you dont need a 300zx unit unless you are making better than 260hp. which you wont do without a turbo/ forced induction.

12-29-2008, 04:43 PM	#16
CrazyKoukiS14 Leaky Injector Join Date: Oct 2008 Location: Chicago, Illinois Age: 32 Posts: 111 Trader Rating: (0) Feedback Score: 0 reviews	i had the same problem, get a tune up done on your car and you should be fine, my problem was my spark plug wires, get some NGK's and its smooth sailing from there

12-29-2008, 04:58 PM	#18
CrazyKoukiS14 Leaky Injector Join Date: Oct 2008 Location: Chicago, Illinois Age: 32 Posts: 111 Trader Rating: (0) Feedback Score: 0 reviews	yup no problem