Unexplainable Bogging Still Wont Go Away - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Powerzen2002 · 04-12-2002, 01:28 AM

Well, as I posted before.  I was saying how my car felt like it is bogging down.  And it is still doing it!  No cracks or leaks anywhere, no fuel smell, no unusual sut, no strange noises other than the EXTREMELY annoying rattle on start up from the time'in chain area.

For whatever reason, as I drive... no matter what gear Im in (however it more commonly happens in 2-3 gear), the car feels like it has a sudden air restriction... if i keep my foot constant though on the gas... it will go away without me having to have to pump the gas.  Its wierd, like ... it just feels like its bogging down... with the occastional poor take-off.

PLEASE I'm desperate, I do not know how else to explain it... but all help or suggestions are welcome!  Ive been working on this prob for about a week now.

What I have done so far to try and fix this:

New Spark Plug Wires
New Fuel Filter
New O-rings (on 2 injectors that felt loose or leaking)
New Air filter
And oil change.

S13drift · 04-12-2002, 07:25 AM

I'm in the same boat.  It's a lot better than before but it's not how it use to be.  I will be working on it some more this weekend.  I 'll let you know what i find.

*LanceS13* · 04-12-2002, 09:28 AM

Mine does that as well...but it goes away once I reach operating temperature.  Does yours not?

*transient* · 04-12-2002, 10:02 AM

My toyota tercel does that, and it's the head gasket... it's leaking a bit of coolant into the combustion chamber and when it hits normal operating temp, it burns off the coolant and runs fine. Have you noticed any coolant in the oil or anything?

boosteds14 · 04-12-2002, 12:56 PM

DID u check your fuel pressure, maybe your fuel pump os shitting the bed and you are getting fuel cuts.
also check your sparck plugs, what do your look like,
any check engine light?? if so fix the problem.

the problem happened to my in my stock 95, and it turns out the egr valve was broken, i really dont know why it effected the bogging, but i cleaned it and wolaa, problem went away.

so what i am trying to say is check the  basics,
1. fuel pressure
2. compression
3. spark
4. check engine light
5. intake system

i hope i put u in the right direction

Powerzen2002 · 04-13-2002, 01:39 AM

Boosted s14, thanks for the tips.  

However, I just checked my spark plugs and they are all a nice tan color... no carbon build up or nothing.  So i will guess they check out ok.  I replaced the spark plug wires though, because one of them went to shit!

How do i check compression and fuel pressure?

thanks for the tips!

CFerrari · 04-13-2002, 05:21 AM

My 90 does the same, I was just told its most likely the fuel pump, Ill know by the end of this weekend.

Powerzen2002 · 04-13-2002, 05:56 PM

Oh man.  I really hope not the fuel pump.  I wanna check it... but not sure how to tell the signs when it is going.

Not familiar with Nissans that much.

however, on any american car... give me any type, model, whatever and ill know pin point it a.s.a.p.

I really gotta get a better Import repair guide.

Thanks for the reply.

04-12-2002, 01:28 AM	#1
Powerzen2002 Zilvia Member Join Date: Apr 2002 Posts: 225 Trader Rating: (0) Feedback Score: 0 reviews	Well, as I posted before.  I was saying how my car felt like it is bogging down.  And it is still doing it!  No cracks or leaks anywhere, no fuel smell, no unusual sut, no strange noises other than the EXTREMELY annoying rattle on start up from the time'in chain area. For whatever reason, as I drive... no matter what gear Im in (however it more commonly happens in 2-3 gear), the car feels like it has a sudden air restriction... if i keep my foot constant though on the gas... it will go away without me having to have to pump the gas.  Its wierd, like ... it just feels like its bogging down... with the occastional poor take-off. PLEASE I'm desperate, I do not know how else to explain it... but all help or suggestions are welcome!  Ive been working on this prob for about a week now. What I have done so far to try and fix this: New Spark Plug Wires New Fuel Filter New O-rings (on 2 injectors that felt loose or leaking) New Air filter And oil change. __________________ No Quote, No Cares, Just Drive.

04-12-2002, 09:28 AM	#3
LanceS13 AutoX Junkie Join Date: Jun 2001 Location: MS Age: 43 Posts: 2,044 Trader Rating: (0) Feedback Score: 0 reviews	Mine does that as well...but it goes away once I reach operating temperature.  Does yours not? __________________ 1992 240SX Fastback #47 DSP MS SCCA RX-7 ITS Project FOR SALE

04-12-2002, 10:02 AM	#4
transient Premium Member Join Date: Jun 2001 Location: Los Angeles, California Age: 41 Posts: 2,947 Trader Rating: (0) Feedback Score: 0 reviews	My toyota tercel does that, and it's the head gasket... it's leaking a bit of coolant into the combustion chamber and when it hits normal operating temp, it burns off the coolant and runs fine. Have you noticed any coolant in the oil or anything? __________________ Learn everything you can, while you still have the chance.

04-12-2002, 12:56 PM	#5
boosteds14 Zilvia.net Advertiser Join Date: Jan 2002 Location: CIPmotorsports Age: 43 Posts: 1,612 Trader Rating: (0) Feedback Score: 0 reviews	DID u check your fuel pressure, maybe your fuel pump os shitting the bed and you are getting fuel cuts. also check your sparck plugs, what do your look like, any check engine light?? if so fix the problem. the problem happened to my in my stock 95, and it turns out the egr valve was broken, i really dont know why it effected the bogging, but i cleaned it and wolaa, problem went away. so what i am trying to say is check the  basics, 1. fuel pressure 2. compression 3. spark 4. check engine light 5. intake system i hope i put u in the right direction __________________ 240SXONE www.240SXMOTORING.com --- One Stop Shop for Your Nissan 240sx

04-13-2002, 01:39 AM	#6
Powerzen2002 Zilvia Member Join Date: Apr 2002 Posts: 225 Trader Rating: (0) Feedback Score: 0 reviews	Boosted s14, thanks for the tips.   However, I just checked my spark plugs and they are all a nice tan color... no carbon build up or nothing.  So i will guess they check out ok.  I replaced the spark plug wires though, because one of them went to shit! How do i check compression and fuel pressure? thanks for the tips! __________________ No Quote, No Cares, Just Drive.

04-12-2002, 07:25 AM	#2
S13drift Leaky Injector Join Date: Feb 2002 Location: Charlotte, NC Age: 47 Posts: 52 Trader Rating: (0) Feedback Score: 0 reviews	I'm in the same boat.  It's a lot better than before but it's not how it use to be.  I will be working on it some more this weekend.  I 'll let you know what i find.

04-13-2002, 05:21 AM	#7
CFerrari Join Date: Apr 2002 Posts: 45 Trader Rating: (0) Feedback Score: 0 reviews	My 90 does the same, I was just told its most likely the fuel pump, Ill know by the end of this weekend.

04-13-2002, 05:56 PM	#8
Powerzen2002 Zilvia Member Join Date: Apr 2002 Posts: 225 Trader Rating: (0) Feedback Score: 0 reviews	Oh man.  I really hope not the fuel pump.  I wanna check it... but not sure how to tell the signs when it is going. Not familiar with Nissans that much. however, on any american car... give me any type, model, whatever and ill know pin point it a.s.a.p. I really gotta get a better Import repair guide. Thanks for the reply. __________________ No Quote, No Cares, Just Drive.