strange wot problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

shift_drift · 03-02-2007, 12:09 PM

Car is a 92 coupe with a ka.

Whenever I do a wot pull, the car will rev perfect through 1st and second, but in third, it feels like i'm hitting fuel cut at about 5500rpms; the car just bogs like crazy. It does this almost everytime. Then, sometimes it'll do similar things in other gears, but in the other gears, if I keep it at wot, the car will "bounce" off the "limiter" at a much lower rpm, then all of a sudden sort itself out and take's off like crazy. The thing about this that throws me off is that it doesnt happen all the time, usually the car runs fine other than the 3rd gear problem, but if i run into the 3rd gear problem, it will start doing the same thing in the other gears, but at lower rpms.

hopefully what i've typed makes sense....anybody have any ideas?

'90RPS13 · 03-02-2007, 12:15 PM

Same problem in my '91 KA.

shift_drift · 03-02-2007, 12:32 PM

took the car out today, and when I did a wot pull in 2nd, and when after when I switched to third and hit the gas again nothing happened, at wot the rpms wouldn't move. when I let off the car died, and I let it sit for a minute, started it up and it ran fine again. this shit is crazy.

Sidewayzzz · 03-02-2007, 12:36 PM

Swirl Control Valve can be sticking, it opens and closes secondary butterflies in your intake manifold, take a look at the diagnostic procedures in the FSM.

s13gold · 03-02-2007, 12:36 PM

distributor.

arkive43 · 03-02-2007, 12:40 PM

hmm what have u checked? could be a fuel or mabey ur maf acting up....mine did that (i have a 91 coupe) cleaned my maf, changed to a z32 fuel filter and it seemed to go away...//it would bog in 3rd//

shift_drift · 03-02-2007, 12:47 PM

I did a power balance test, cleaned my maf, the egr is working fine, couldnt find any vacuum leaks. I'm about to go check my plugs/wires/dist cap&rotor, but all of those are less than a year old and have less than 7k miles on them. I'm going to replace the fuel filter today, and the plugs if they look messed up. Is there anyway to check the distributor or coil other than switching it out with a known working one?

Dream240 · 03-02-2007, 02:08 PM

Per the FSM, in section "EC" page EF & EC 86:

DIAGNOSTIC PROCEDURE 17 - LACK OF POWER AND STUMBLE

CHECK FUEL PRESSURE: IGN ON - 43 PSI, AT IDLE - 34 PSI
CHECK INTAKE AIR LEAK, lower blow-by air supply, does engine speed rise?

Download an FSM and check out section EC. Best section.

shift_drift · 03-02-2007, 02:47 PM

I've been messing with it for a while now. I need to go by a fuel pressure guage now. Thanks for the advice.

03-02-2007, 12:09 PM	#1
shift_drift Leaky Injector Join Date: Apr 2005 Location: Silver Spring, MD Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	strange wot problem Car is a 92 coupe with a ka. Whenever I do a wot pull, the car will rev perfect through 1st and second, but in third, it feels like i'm hitting fuel cut at about 5500rpms; the car just bogs like crazy. It does this almost everytime. Then, sometimes it'll do similar things in other gears, but in the other gears, if I keep it at wot, the car will "bounce" off the "limiter" at a much lower rpm, then all of a sudden sort itself out and take's off like crazy. The thing about this that throws me off is that it doesnt happen all the time, usually the car runs fine other than the 3rd gear problem, but if i run into the 3rd gear problem, it will start doing the same thing in the other gears, but at lower rpms. hopefully what i've typed makes sense....anybody have any ideas?

03-02-2007, 02:08 PM	#8
Dream240 Nissanaholic! Join Date: Dec 2002 Location: Inland Empire, California Age: 46 Posts: 2,188 Trader Rating: (8) Feedback Score: 8 reviews	Per the FSM, in section "EC" page EF & EC 86: DIAGNOSTIC PROCEDURE 17 - LACK OF POWER AND STUMBLE CHECK FUEL PRESSURE: IGN ON - 43 PSI, AT IDLE - 34 PSI CHECK INTAKE AIR LEAK, lower blow-by air supply, does engine speed rise? Download an FSM and check out section EC. Best section. __________________ Don't mess with my monkey...he's loaded.

03-02-2007, 12:15 PM	#2
'90RPS13 BANNED Join Date: Jan 2006 Location: NC Age: 38 Posts: 2,839 Trader Rating: (0) Feedback Score: 0 reviews	Same problem in my '91 KA.

03-02-2007, 12:32 PM	#3
shift_drift Leaky Injector Join Date: Apr 2005 Location: Silver Spring, MD Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	took the car out today, and when I did a wot pull in 2nd, and when after when I switched to third and hit the gas again nothing happened, at wot the rpms wouldn't move. when I let off the car died, and I let it sit for a minute, started it up and it ran fine again. this shit is crazy.

03-02-2007, 12:36 PM	#4
Sidewayzzz Zilvia Member Join Date: Mar 2006 Location: Vegas Age: 39 Posts: 221 Trader Rating: (0) Feedback Score: 0 reviews	Swirl Control Valve can be sticking, it opens and closes secondary butterflies in your intake manifold, take a look at the diagnostic procedures in the FSM.

03-02-2007, 12:36 PM	#5
s13gold Post Whore! Join Date: Jan 2007 Location: CARSON Posts: 4,240 Trader Rating: (79) Feedback Score: 79 reviews	distributor.

03-02-2007, 12:40 PM	#6
arkive43 Zilvia Addict Join Date: Sep 2006 Location: houston Age: 41 Posts: 795 Trader Rating: (0) Feedback Score: 0 reviews	hmm what have u checked? could be a fuel or mabey ur maf acting up....mine did that (i have a 91 coupe) cleaned my maf, changed to a z32 fuel filter and it seemed to go away...//it would bog in 3rd//

03-02-2007, 12:47 PM	#7
shift_drift Leaky Injector Join Date: Apr 2005 Location: Silver Spring, MD Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	I did a power balance test, cleaned my maf, the egr is working fine, couldnt find any vacuum leaks. I'm about to go check my plugs/wires/dist cap&rotor, but all of those are less than a year old and have less than 7k miles on them. I'm going to replace the fuel filter today, and the plugs if they look messed up. Is there anyway to check the distributor or coil other than switching it out with a known working one?

03-02-2007, 02:47 PM	#9
shift_drift Leaky Injector Join Date: Apr 2005 Location: Silver Spring, MD Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	I've been messing with it for a while now. I need to go by a fuel pressure guage now. Thanks for the advice.