ka24de running issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

gixxerbear · 02-14-2012, 07:59 PM

I've been having some issues with my 92 240sx, the car has been having some maf issues for a while now but has finally crap out. In the past the car would idle rough and misfire but a tap on the maf would fix it, the other day it started idling rough, misfiring, and running super rich. I had a good ground and power at the maf and runs fine with it unplugged so i figured bad maf. After replacing it with a used maf and brand new maf still runs like shit, can find any vacuum leaks and no cel codes. Any idea's as to a possible solution? Thanks in advance.

c_mancuyas8 · 02-14-2012, 08:51 PM

have you checked plugs?

gixxerbear · 02-14-2012, 09:00 PM

Yes, plugs are fairly new and after playing with the motor a little i have found that if i make a vacuum leak the engine runs a little better which makes sense because of how rich its running. I checked the injectors and they dont seem to be stuck open so when i pull the fuel pump fuse the car runs perfect for about a minuet unit there is no fuel. I put a clamp on the fuel line right after the filter and the car idles better. Could this be a vacuum leak to the fpr or the fpr it's self? I do know that the prior owner installed a bigger fuel pump and i fixed a fuel leak at the filter a few weeks ago.

slothonaleash · 02-14-2012, 09:05 PM

have you checked your fuel pressure?

gixxerbear · 02-14-2012, 09:17 PM

I guess thats my next step I dont have a gauge at home so i will have to wait until i go to work tomorrow. I have never had a stock fpr go bad on a car before is the a common 240 issue?

c_mancuyas8 · 02-14-2012, 09:25 PM

I dont think its common but its not impossible.

gixxerbear · 02-16-2012, 04:50 PM

Ok so after a day of diag I've found that my maf, injectors, o2, plugs, and wires are good. But I'm have an issue getting a good fuel pressure reading. I have 43 psi going in and nothing on the return but when I remove the vacuum line to the for nothing changes so tomorrow I'm going to try a new fpr.

92sxMike · 02-24-2012, 07:04 PM

So any luck with chaning the fpr? I'm having the same issue to a degree, but I think my issue is an injector, but I will also check the following.

02-14-2012, 07:59 PM	#1
gixxerbear Join Date: Jan 2010 Location: Maryland Age: 38 Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	ka24de running issue I've been having some issues with my 92 240sx, the car has been having some maf issues for a while now but has finally crap out. In the past the car would idle rough and misfire but a tap on the maf would fix it, the other day it started idling rough, misfiring, and running super rich. I had a good ground and power at the maf and runs fine with it unplugged so i figured bad maf. After replacing it with a used maf and brand new maf still runs like shit, can find any vacuum leaks and no cel codes. Any idea's as to a possible solution? Thanks in advance.

02-14-2012, 08:51 PM	#2
c_mancuyas8 Zilvia Junkie Join Date: Feb 2011 Location: greenwood s.c. Age: 41 Posts: 461 Trader Rating: (12) Feedback Score: 12 reviews	have you checked plugs? __________________

02-14-2012, 09:25 PM	#6
c_mancuyas8 Zilvia Junkie Join Date: Feb 2011 Location: greenwood s.c. Age: 41 Posts: 461 Trader Rating: (12) Feedback Score: 12 reviews	I dont think its common but its not impossible. __________________

02-14-2012, 09:00 PM	#3
gixxerbear Join Date: Jan 2010 Location: Maryland Age: 38 Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	Yes, plugs are fairly new and after playing with the motor a little i have found that if i make a vacuum leak the engine runs a little better which makes sense because of how rich its running. I checked the injectors and they dont seem to be stuck open so when i pull the fuel pump fuse the car runs perfect for about a minuet unit there is no fuel. I put a clamp on the fuel line right after the filter and the car idles better. Could this be a vacuum leak to the fpr or the fpr it's self? I do know that the prior owner installed a bigger fuel pump and i fixed a fuel leak at the filter a few weeks ago.

02-14-2012, 09:05 PM	#4
slothonaleash Zilvia Addict Join Date: Jan 2007 Location: Columbus, Ohio Age: 33 Posts: 745 Trader Rating: (4) Feedback Score: 4 reviews	have you checked your fuel pressure?

02-14-2012, 09:17 PM	#5
gixxerbear Join Date: Jan 2010 Location: Maryland Age: 38 Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	I guess thats my next step I dont have a gauge at home so i will have to wait until i go to work tomorrow. I have never had a stock fpr go bad on a car before is the a common 240 issue?

02-16-2012, 04:50 PM	#7
gixxerbear Join Date: Jan 2010 Location: Maryland Age: 38 Posts: 8 Trader Rating: (0) Feedback Score: 0 reviews	Ok so after a day of diag I've found that my maf, injectors, o2, plugs, and wires are good. But I'm have an issue getting a good fuel pressure reading. I have 43 psi going in and nothing on the return but when I remove the vacuum line to the for nothing changes so tomorrow I'm going to try a new fpr.

02-24-2012, 07:04 PM	#8
92sxMike Leaky Injector Join Date: Jul 2009 Location: Youngstown, Ohio Age: 40 Posts: 61 Trader Rating: (0) Feedback Score: 0 reviews	So any luck with chaning the fpr? I'm having the same issue to a degree, but I think my issue is an injector, but I will also check the following.