I had changed my fuel injectors since I had a code 45 a leaky injector and it came to be coming out from my EGR connection to my header. Anyway After changing my fuel injectors and putting my fuel rail all back together I'm getting a mixture of gasoline and motor oil inside the engine how is that possible. Before changing the fuel injectors I didn't have such issue, I know I could see the leak from the headers EGR connection and could see a spray mist of gasoline coming out from it but all in all i tough it was because of the EGR system. What could it possibly be that I'm having a mixture of gasoline and motor oil inclusively coming out of my exhaust once I start the engine? When that didn't happened before changing the fuel injectors? New header is getting installed btw. Please anybody? Any Ideas?

240SX engines are defnitely not 2stroke! Need to fix/

I know right? So i was thinking of an open fuel injector but they are brand new Hitachi's and I have two fuel rails one with cheap injectors and the other one with Hitachi's. What did I do worng here? That im getting that mixture of gas in my motor oil crankcase coming out of my mufler? Hummm any ideas? Will keep troubleshooting with a mechanic this is a challenge and good info for others.

After changing my fuel injectors I'm getting fuel mixed with motor oil. Inclusively is coming out from the exhaust. I got Hitachis FI's from Rock Auto, I had also a leak on my EGR connection to my headers what I was trying to fix because that's where my leaky injector code from the ecu was coming from. Anyway I got the new headers but still working with that EGR tube because it was zeised in there. So once I repair that EGR Issue then I will do some fuel injectors testing for leaks and also which I hope is not the issue Cylinders compression test for o-ring damage..
Does anybody know how this happened? Since before I started changing the fuel injectors that was not happening?

Thanks

jsando2, I know you're anxious to get your problems resolved but creating multiple threads for the same issue is a no no. It can cause confusion and is often counterproductive. Topics merged.

You don't have fuel or oil coming out of your exhaust, that would be almost impossible. That's condensation and exhaust soot.

Did you replace the injector seals? How about the plastic pads under the fuel rail bolts? If the injectors aren't seated perfectly, you'll have leaks. People sometimes bend the fuel rail installing it incorrectly.

The injectors and EGR connection should not have anything to do with each other. Those are two completely separate issues.

When you mention the plastic pads under the fuel rail bolts, are you talking about the 2 actual bolts that holds down the rail in place? Also there's a nut that attaches to it all the way on the left bottom. But if you are talking about the Big Thick O-rings that goes at the tip of the injectors inside the fuel rail then yes those are new as well.

Also believe me there's fuel coming out of the exhaust because the fuel is getting mixed inside the engine so it could be two things. 1- An open Injector or better say a fuel leak in within my fuel rail or My O-rings have said bye bye. Some way somehow it was not doing this before I started working on my fuel system so i must have done something wrong or some part is not working properly.

Next I will do the Fuel injector test for leaks. I will take the rail off leaving injectors in place put the switch on start to see if I see any gas leak. All injectors are new. I have two rails one with cheap injector and the other one with Hitachi's from Rock Auto. I got new o-rings kits put on together and even better screws for better adjustment on the cap cover.

The EGR yes I agree is all whole new ball game. Still working on that got the Header installed but still need to work on that EGR Pipe which needs to be uninstalled and then taken to shop to get the end part of it UN-seised.
I hope I can come out with the upper hand and get my fuel system top notch and not to worry about O-Rings.

Money is going down the drain and still not even half way there yet. Uufff

Did you lube the o-rings when you inserted the new injectors? If not, there's a good chance one or more of them got twisted on the way in and now are dumping raw fuel without being fired.

Actually they went in with no problems nice and easy! just had to put them in and cap them in and tra-la no issues when it comes to O-rings and you buy them I guess sometimes they are not a true fit for your application. I will check the whole thing again once I start doing the tests. and replace it with the other rail I have. How about the gas regulator what can you tell me about that will that be something that will flood your rail system if not working properly? Because Im almost 100% sure that my fuel system is pushing so much gas that it will flood my rail system and go into my exhaust and find its way into the engine before combustion correct me if im wrong

jsando2 wrote: ↑

Tue Sep 28, 2021 4:22 pm

Actually they went in with no problems nice and easy! just had to put them in and cap them in and tra-la no issues when it comes to O-rings and you buy them I guess sometimes they are not a true fit for your application.

They shouldn't go in easy even if they're lubed. Those rings need to hold full pressure from the fuel pump. If they slid in with little or no force then the rings are probably the wrong ones.

jsando2 wrote: ↑

Tue Sep 28, 2021 4:07 pm

When you mention the plastic pads under the fuel rail bolts, are you talking about the 2 actual bolts that holds down the rail in place? Also there's a nut that attaches to it all the way on the left bottom. But if you are talking about the Big Thick O-rings that goes at the tip of the injectors inside the fuel rail then yes those are new as well.

No, I'm talking about the black plastic spacer that goes between the brackets and the fuel rail (the bolts that attach the rail to the engine go through these spacers). If they're missing or the wrong thickness, the rail will appear to be installed correctly, but will be tilted at a slight angle and likely the injectors will not seat properly. See link: https://www.enjukuracing.com/products/o ... a24de.html

Also, if fuel is making it all the way to the tailpipe, your cat is history. I'm still not convinced it's fuel, but you have bigger issues under the hood for now.

Are you sure you didn't accidentally switch the feed and return fuel hoses on the rail?

I though about that but i was making sure of it. Now that you brought it up! to make sure the fuel line that connects to your fuel filter is the line that points / goes to the right side of the fuel rail (cylinder 1)
Cat gone? Will have to check on that but is not really a mayor concern for now I got bigger fish to catch. Yup Gas going all the way to my crankcase, mixing it all around my engine and coming out the exhaust, had to change the oil already once and after I troubleshoot again this fuel system issue will have to change oil / filter again whoooshh.

AZhitman wrote: ↑

Tue Sep 28, 2021 5:23 pm

jsando2 wrote: ↑

Tue Sep 28, 2021 4:07 pm

When you mention the plastic pads under the fuel rail bolts, are you talking about the 2 actual bolts that holds down the rail in place? Also there's a nut that attaches to it all the way on the left bottom. But if you are talking about the Big Thick O-rings that goes at the tip of the injectors inside the fuel rail then yes those are new as well.

No, I'm talking about the black plastic spacer that goes between the brackets and the fuel rail (the bolts that attach the rail to the engine go through these spacers). If they're missing or the wrong thickness, the rail will appear to be installed correctly, but will be tilted at a slight angle and likely the injectors will not seat properly. See link: https://www.enjukuracing.com/products/o ... a24de.html

Hummm that's two of them right? If so definitely i Never put those on and I know I have them but I overlooked them. :/ Wao I will have to check on that. Also the O-rings I got they got in almost with no obkjection at all I just had to put them on top and then lock them up with the FI CAP and that's it. But for sure I did not put those two spacers on my Fuel Rail. Just for reference the spacers go in Between the fuel rail and the engine.

Might want to pull down that FSM for your car before going any further.

The injectors didn't seat properly if they went in easily.

nissanservicemanual.com

What is <<<FSM>>>Fuel System Manifold?

Factory Service Manual

NP! FSM is in place still like new, Noting better than doing some search and asking ?? on Forums like this one.

I think we misunderstood each other.

I was saying, go to that link and look at the FSM. That's the factory manual that covers all repairs.

Got ya!

AZhitman wrote: ↑

Tue Sep 28, 2021 10:29 pm

I think we misunderstood each other.

I was saying, go to that link and look at the FSM. That's the factory manual that covers all repairs.

Update:

Did the FI test and I have FI # 2 & 4 stuck open from Rock Auto Hitachi's Bran New!

Update! It seems like the leak is coming from the lower O-ring not the tip of the injector or better say spray pattern does that make sense? will change and replace lower o-rings with new ones and check.

Make sure they're the right ones. Since the new injectors went in too easily, it's pretty obvious they're either the wrong injectors, the wrong o-rings, or both. You need to identify the root of the problem, not just throw the same new wrong parts at it.

It was ordered by make model and year and they look like the right ones OEMs. It will be a matter of doing some good troubleshooting I have an extra fuel rail with new fuel injectors and a whole new set of o rings as well. Will see….

Ordering by MMY is suicidal. Get the Nissan p/n's by VIN. Then if you want aftermarket equivalents, search them by part number..

Also, it's unlikely that they're OEM. Chinese knockoff injectors have a historically bad rap (and I don't care that they say "Hitachi" on them, that doesn't mean they're OEM).

I've tossed dozens of bunk injectors in the trash.

You getting me with all these abbreviations, what is MMY?

Any good website to get good ones? Link?

Make / Model / Year

https://www.enjukuracing.com/products/d ... a24de.html

Update: After checking each FI it was discovered that FI 1,3 and 4 )-Rings were damage, I replace all O-rings and leak is GONE! No More leaky Injectors. Still need to install rail but waiting for the spacers to arrive tomorrow since I overlooked at that and I only found one, that could have been the reason to damage the O-Rings,:) Will update once tested.