Nissan/Infiniti Tech SR20DET? RB26DETT? VQ35DE? What's it all mean? Find out here!

important question

Old May 14, 2008 | 07:00 PM
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alright i forgot to add that the fuel pump turns on, i can hear that bitch its so loud, i pulled off the fuel rail and kept the injectors plugged in, and kept the gas lines hooked up, and all of the injectors are pulsing when you turn the engine over, all the gas lines are flowing fine, and all of the relays and fuses are fine.....
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Old May 14, 2008 | 07:42 PM
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Doesn't matter, age is age. Inspecting the wires and doing a resistance test should be on your list for those fuel pump wires.
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Old May 15, 2008 | 02:26 AM
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alright well thank you i will have to check that out and keep you posted!
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Old May 15, 2008 | 07:35 AM
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trust me, it isn't a "too much fuel because of the fuel pump" issue.
I would bet that over half of the stock 240s you see on the road have walboro pumps in them, because it is cheaper and better than a stock pump.
Shit, I've got a walboro 225 in my car and it is a stock sohc with 175,000 miles on it.
you need to be looking more towards things like the spark plugs, the wires, the coil pack. I'm even starting to get the feeling that it might be compression related, but that would be uncommon because it is a newer motor, unless you or the previous owner never changed the oil...

Taking the line of the rail is only letting there be enough pressure in the rail for one cylinder to fire properly. It is kinda running after that because there is a little bit of fuel in the other cylinders and there is no load.

Have you tried a different rail? maybe the Fuel pressure regulator is bad...
That or the vacuum line that is supposed to be attached to it came off....


actually the more I think about it, the more I think that might be the problem, check that vacuum line and make sure it is on there good and tight. and if you still have all of the emissions and what not, make sure that where that line is getting vacuum is good. there is a manifold thing on the back of the head that supplies multiple things with vacuum from one source, so follow it all the way to the beginning and make sure it is all good.
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Old May 15, 2008 | 12:39 PM
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alright true true, yes i have changed, the coil pack, dizzy and cap, all new spark plugs, new fuel regulator, and yes the vacuume line is connected to the regulator to the niple on the intake manifold, all of the emisions shit is delelted it seems like. i did a compression test about a month ago its 185-195 across the board. well i just got a stock fuel pump for 10 bucks so im going to try that later tonight but i just cant think of anything else.
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Old May 15, 2008 | 03:55 PM
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Originally Posted by norachelhere
actually the more I think about it, the more I think that might be the problem, check that vacuum line and make sure it is on there good and tight. and if you still have all of the emissions and what not, make sure that where that line is getting vacuum is good. there is a manifold thing on the back of the head that supplies multiple things with vacuum from one source, so follow it all the way to the beginning and make sure it is all good.
this will not cause any rich issues. removing vacuum source from the regulator only brings it to static fuel pressure which is 45psi as opposed to 38psi with vacuum. not enough for a poor running condition.

and if there were to be a vacuum leak on an NA setup, it would cause it to run lean.. not rich. remember, it is pulling in MORE air than the ecu is alloting fuel for.

a vacuum leak on an SR would cause a lean condition, but rather a blown couple would cause a rich condition bc when a pipe blows off, the turbo is allowed to freespin a little quicker (no restriction) and since the turbo draws in much more air than your open throttle body is, the MAF is counting more air than the motor is receiving.

hence why on an SR when you blow a pipe off its pig rich, but not with a vacuum leak.

in a nutshell, not a vacuum leak.


if you can swing it by S&R, ill check it out for ya. or if youre not too far, i might be able to make a house call sunday or so.
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Old May 15, 2008 | 04:42 PM
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Originally Posted by Durdan
this will not cause any rich issues. removing vacuum source from the regulator only brings it to static fuel pressure which is 45psi as opposed to 38psi with vacuum. not enough for a poor running condition.

and if there were to be a vacuum leak on an NA setup, it would cause it to run lean.. not rich. remember, it is pulling in MORE air than the ecu is alloting fuel for.

a vacuum leak on an SR would cause a lean condition, but rather a blown couple would cause a rich condition bc when a pipe blows off, the turbo is allowed to freespin a little quicker (no restriction) and since the turbo draws in much more air than your open throttle body is, the MAF is counting more air than the motor is receiving.

hence why on an SR when you blow a pipe off its pig rich, but not with a vacuum leak.

in a nutshell, not a vacuum leak.


if you can swing it by S&R, ill check it out for ya. or if youre not too far, i might be able to make a house call sunday or so.
again, it is unknown if it is indeed flooding out... It might be, but it isn't 100%, so we are tossingout other ideas of things that the OP might not have thought of yet, so thanks for the enlightenment on vacuum leaks...
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Old May 15, 2008 | 04:43 PM
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To the OP, I know it sounds dumb, but do you have the firing order right?
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Old May 15, 2008 | 06:30 PM
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haha yes i have the firing order right, i thought that was the problem first but i have rechecked that about 5 times and timming 3 times the only thing that i have not changed would be the maf
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Old May 15, 2008 | 06:34 PM
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to Durdan well i live by gateway mall on 9th street and i would love the help
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