I need to have my upper manifold removed to access the rear fuel injectors. My mechanic says it will take him 3 hours of charged labor. I've looked at the Haynes manual and while I see that there's a bunch of hoses that need to be removed there, is that a good estimate for labor cost?

Also, we think I have a leaky fuel injector, and says I may need to replace the fuel injector itself. Is this possible, since I thought if it's leaky but functional I'd only need to replace one of the o-rings around the injector?

Thanks

If the injector is leaking it has an internal failure unless its just leaking around the 0-ring. By leaking do you mean running all the time letting gas into the engine or is there no compression?

I just pulled off my intake for the first time the other day. The first time doing it it took a while cause i didn't know where anything was. You need to first unbolt it from the front and then there are seven vacuum lines around the intake. on the back of the intake facing the fire wall you need to unbolt the EGR and the coolant line there. disconnecting the throttle cable is optional, you can just let it hang off to the side, your choice. i could prolly do it now in about a 45min-1 hour.

You get bad gas mileage ? what are the symptoms ?

it should only take a couple of hours to remove the manifold.....there are multiple things that cause leaky injectors.....IMO i feel it better to replace the whole thing with new o-rings and all just to make sure u got the cause and dont have to rip it apart again

took me about 1-2 hours to take it off. But that was with labeling hoses and all. Not too bad.

yeah, I agree do it yourself it's not that hard 1-2 hours to remove manifold.

Hours?? if it takes anyshop more than an hour of labor to remove it then they are ripping you off... its easy to remove... i can take it off replace all three injectors in and hour....

so from everyones experience its not needed to disconenct the accelerator and cruise control cables? to remove the upper intake manifold

yea it is.. u just un hook them.. its easy

disconnect? no. but they move easily to the side.

What he said. No need to disconnect just put off to the side.

Im sorry, but NO shop is going to charge you an hour to take off the manifold, fix an injector and re-install. Theres time involved in this. I would say hes acurate with the 3 hours of labor. setup time, break down time, re-installation.

Having done in it about 5 times, I would be able to un-install in about an hour, and reinstalll in an hour. So I would think someone thats not familiar with it 100%, 3 is decent

If you know how to do general wrenching on a car, do it yourself. Its pretty straight forward.

-matt

yea no kidding no shop is gonna charge u an hour to do all that... it should not take them an longer than an hour to remove it though... iv taken that crap apart like 10 times because on of the "new injectors" that i got was bad and i could not figure out which on it was.. so i had some good practice in doing it..

I want to ask.. Does the TB and INTAKE MANI remain ATTACHED as you take it out?

Also, I am a bit uncertain with the lines on the TB itself.. I'll try take some pictures.

Wow, it took me WAY longer than that when I did it. Taking it off was easy; putting it back was the biatch. If I remember correctly, there were a couple of bolts and hoses (with hose clamps) in the rear, and there's almost no room to get your hands and tools back there.

The hood really gets in the way too. I ended up taking the struts off and pulling it back, which cost me a new windshield...

i had the problem with the hoses at the back and the 2 bolts that support the intake manifold at the back sucked, but overall not too bad just try to figure out what u gotta do before u start

The first time you ever do it, it will be horrible. It could take you quite some time. The first time I did it it took me forever. I had a really hard time removing the 2 bolts in the back of the manifold, along with the hose thats back there facing the passenger side of the car. Those two parts probably held me up about an hour or so. I remember wanting to just rip the manifold out of the car, I got so frustrated. But now I can take it apart in about 45 minutes and reinstall in about an hour. So you'll survive.

^^ I felt about 4 bolts on the back of the mani near the firewall? I am thinking of removing the coolant hose as there is not way for my tools.

In my other thread, is this what I have to take out?

if you're talking about the coolant hose going into the firewall, let me be the first to warn you to be extremely careful with those hoses. I had to remove one to get the pass. side rear UIM bolt out, and while I was twisting it, it snapped the neck of my heater core right off. It was brittle and fragile as a lightbulb. $400 later, I have heat again.

i fuked my hand up but I managed to do with out and removed the 2 bolts on the intake mani. i guess i gotta retighten it. PHEW

It took me a couple of hours the first time I did it, but only 30 minutes to get it off for the 00VI swap. An impact wrench helped though.

When you take off the front bolts to the UIM, and get the rear ones off, you can move the UIM to remove the coolant lines.

Two things,

If the hood gets in the way, REMOVE IT, dont just undo the struts. It will crack your windsheild.

Dont touch the coolant lines going into the firewall.

Taking the manifold off isn't that big of a deal. There are six bolts from the manifold itself (not including the EGR tube), the Intake assembly, throttle body, IAVC and any little sensor that's in the way. You'll get the hang of it within the first 10 minutes. Like everyone said, be very careful with the coolant line connected to the rear of the manifold, I nicked it twice already putting the manifold on and have had coolant leak while I'm driving.

Hi there, I was reading about the manifold that you have to remove on your car and I was wondering, I have a 2001 Nissan Maxima 3.0 L engine I think I have four bolts that have to be removed from the back but it's kind of difficult to do. Is it possible you may know someone who has change one before? If I only had a picture I can see all the bolt holes and that will give me a clear indication because I too have to take out my fuel injectors to be cleaned. If you have time to shed some light on this I would be most appreciated, thank you, Sir Tony

Fail

Just fyi this thread is 5 years old. And in the wrong forum for you.

Go browse the 5th gen forum or use search to find the factory manual for your year. It really isnt hard to do though just label every hose and be careful not to strip the bolt holes when youre reinstalling.

Cut the guy some slack, atleast he searched instead of making a new post.

Just did mine for the second time in a week to take care of the oil leak on the rear valve cover. Takes 30 min to take it off. Not hard at all. The only thing is getting tot he 2 rear bolts and the coolant hose next to the EGR tube. I used an air ratchet for the bolts I could reach with it.