i was gunning my car in third gear, then all of a sudden the gas cuts off at 4500 RPM, i was also low on fuel but that doesnt prove why now that when i gun it (after filling up) the car feels very laggy and feels like im carrying a really large load, a loss of power. i just replaced my fuel filter, so im guessing thats not it. any help would be great, thanks.

 

check for leaks. (exhaust) Maybe MAF

 

MAF sensors can cause that issue. Running stock air filter or K+N? I've seen a bunch of MAF's blow when using an oiled air filter...oil hits that hot wire and....pow.

 

This is taking a guess-

Since you were low on fuel, maybe you sucked the sediment out of your gas tank and clogged your injector.

 

i filled up to 1/2 a tank, normal dirving is OK, but still feels like something is clogged and feels like something is holding it back, faster then when i had an empty tank, but still way slower than usual.

if my MAF is defective, wouldnt that trigger the CEL?

 

anybody else have any other tips or suggestions?

 

you can test the maf....check the FSM, chiltons or haynes...but most of the time, if you MAF goes you will know it big time!!! car will barely run...and most of the time mafs really die....they don't intermittantly die

but I think I may have the same issue....does your car after a whole night of sitting ever not start immediately on the first key turn? and the fuel cuts only when low on gas right? sounds like a problem I have (I also have a brand new fuel filter-nissan oem)...if it's fuel related it can be the injectors, those intermittantly fail, or fuel pump, FPR...any of those, all of which I am replacing soon, so I will let you know how it goes...and if this problem goes away...

are you a 5spd by the way? cause some other guys on here are telling me that when their diff bearings started going, it would do that intermittantly, but on my last tranny, when my diff bearings went, it never did this...

 

yes, im a 5 speed, and yes, my car cuts-out when i was on a low tank.

my friend told me that i should run fuel injector cleaner, im probably gonna try BG44K, but that stuff is hard to find.

 

I've already used that stuff twice....it's purely amazing!! but that didn't cure the problem...so I don't think it's the injectors! I even had the professional computer-machine assisted BG injector cleaning service done at a shop for $115 or so...still have that problem occassionally....so it either is something with the fuel pump, FPR, coil pack, or it is tranny/clutch related...we shall find out, as I am going to tackle all of those soon...

oddly enough as well, this only seems to happen in 3rd gear at that same rpm as well...so it sounds like I have a similar problem...

 

do you lose power across the entire range or just at 4500 rpm and above?

what happens when you just rev the engine to 4500 while sitting still?

when i've had injector problems (i.e. failure) they die. they don't work off and on. and i get a misfire detection code on the cylinder and a knock code.

 

injectors can fail intermittantly, but like I said...with the amount of BG44K and other professional injector services thrown at mine, I have ruled out my injectors causing the problem...sitting still, my car will rev like nothing else...lol...just in gear...so it might very well be tranny/clutch related...

 

well, just revving my engine, it seems like there is some lag and the lag happens throughout the whole RPM no matter which gear.

 

oddly enough, my car does the same thing though...it would be strange to find out if we have the same problem but two seperate causes!

although in all my years of toying with cars and mechanical work, I have seen more suprising things!

 

im really hoping we can find a solution to this, this sux

 

hhm i doubt a ks would cause this, only the maf limits your rpm though

 

I would say you had a lot of condensation or water mixed with your gas. If not it could be injector clogged.

 

Double check your fuel filter installation.

 

what could go wrong with the filter installation? i dont see any leaks tho

 

i just realized something, could it be my CV boot? they started leaking a while ago but havent completely ruptured yet.

 

Pull the vacuum hose off of your fuel pressure regulator and check for fuel in the hose. If you've got fuel in the vacuum hose, your FPR is leaking and you'll need a new one. This can cause problems with running and especially starting.

 

My car will cut out going from 2nd to 3rd under full throttle, but only on rare occasions. This started happening after I had aluminum flywheel installed, I've heard that this can be from the flywheel being too light? 5lb. aasco motorsports

 

how does the flywheel cause the motor to cut off? sounds like a fuel pressure problem to me or an electrical short somewhere....

 

tap your MAF with a screwdriver hard and if ur car shuts off than u need a new MAF. nissans are known for MAF problems. i had the same problem once and it turned out to be my IAT sensor and MAF senor that was out. my car would run fine but under heavy acceleration it would almost cut out and a major instant loss of power was noticeable....i had an ebay intake at the time and my IAT was positioned incorrectly which harmed my power band and also my MAF was going out due to oil on the filter that was leaking into the system.

 

these problems arose for me after installing a cone filter on my intake using the MAF adapter, i didnt have a hole for the IAT, so i just put it in the filter and left it inside, could that have caused the problem? and if the MAF and IAT is defective, wouldn't that make the CEL go on?

 

well I have the apexi dry filter....so no oil to destroy the maf, and I have cleaned the maf diode/resistor with electrical cleaner from Radio shack, so I don't think it's the maf...and wouldn't a bad maf cause horrible driving no matter what throttle and all the time driveability problems? or are they intermittant? also, where is the proper place to have the IAT? is right near the filter okay but not in it...kinda on the strut mount there...? and if that was bad, it would pull a code I would think...

 

K......s.........

 

i dont think its the knock sensor, just replaced mine about 6K miles ago and when i read the codes on the ECU, i got nothing except the 0505 which means everything is normal.

 

It has to do w/ the rotational inertia of the crankshaft!

 

after all these days, im still bothered by this problem.. im thinking that my y-pipe is clogged or something is obstructing the flow, could this also cause the power loss, if so, how can i solve this matter?

 

your y pipe is clogged? lol...go to the hardware store and get some drano...

 

the reason why I think its CLOGGED is because I realize the flow of exhaust doesnt come out as much as usual.