15 replies to this topic

[matt b]

Since the topics I found this past were without pics, here's a quick rundown of how to replace injectors on an 850 or early gen X70.

Tools needed:
a 17 mm open end wrench (for the fuel line going to the rail)
Some rags and old towels to catch the draining fuel
A 10 mm socket for the fuel rail bolts
A torx head screw driver for the TB cover

How-to:
Pop the fuel rail cover off, you can just pull it towards the front of the car.



Take the cover off the throttle body, it's usually held on by a Torx head screw.



Unplug your old fuel injectors. You can just push the pigtail away from your work area, there is plenty of slack in the wiring harness.



Take the blue cap off the right side of the fuel rail and using a small screwdriver, push down on the valve inside the stem, it'll drain most of the fuel out of the rail.



I couldn't grab a pic of me draining it, but you'll understand when you get there. Use a thick towel, there is a good amount of fuel in the rail.

Using the 10 mm socket, remove the two bolts that hold the fuel rail to the intake manifold.



Using the 17 mm wrench, remove the fuel line from the fuel rail.



Pull on the fuel rail, straight towards you to remove the rail and injectors from the car.



Don't be like me and pull too much on one side, you'll end up with part of your injector still inside your intake manifold:





If that happens, just put some grease on the tip of a torx screwdriver and fish it out gently.



I was replacing my red tops which flow at 315cc with some white tops which flow at 345cc since my tune calls for them. Here they are on the fuel rail:



If you cannot remove your old injectors from the rail, rotate them 90 degrees and slide a screwdriver underneath them to pop them off.

Replace the fuel rail, bolt it down and make sure that the new injectors are seated properly:



Pop the fuel rail cover back on and done!



I used CruzinPerformance to clean and rebuild my white ones: Link to their site

I paid $16/injector to have them cleaned. I got a detailed report of how they flowed before and after the cleaning. Once I have my personal information removed from the result sheet, I'll post it up.

Hopefully this post will elp clear up some of the confusion about how to remove and clean injectors. I'll try to hunt down some related threads and part numbers and will post them in case anyone wants to service them themselves.

[bergmjs]

Wow, great write-up. Makes me almost want to clean my injectors haha

[matt b]

Thanks.

Here is the information on the flow rates: Link to Gary's thread

And here are my results:

[db130]

i see incremental improvements across the board but i have no idea how to interpret those numbers

am i to infer that the injectors pretty good to begin with, even before the servicing?

[7 VII 7]

Yeah... the injectors look to be good from the beginning

[TorqueSteer]

Thanks for the writeup. FYI, the process is slightly different on 850's, you there is just one additional step to remove the rubber fuel return hose from the regulator.

[FCP Groton]

Great write-up. It is much easier to follow when you have pictures.

[matt b]

db130, on 06 August 2009 - 02:34 PM, said:

i see incremental improvements across the board but i have no idea how to interpret those numbers

am i to infer that the injectors pretty good to begin with, even before the servicing?

Yes, I used injectors with 90K miles, and did not know what to expect.

7 VII 7, on 06 August 2009 - 02:47 PM, said:

Yeah... the injectors look to be good from the beginning

Look at it as cheap insurance. Having the screens and o-rings replaced was nice, saved me some time.

TorqueSteer, on 06 August 2009 - 02:49 PM, said:

Thanks for the writeup. FYI, the process is slightly different on 850's, you there is just one additional step to remove the rubber fuel return hose from the regulator.

This was done on my wagon (see sig), the info at the top of the sheet was only related to the injectors. But maybe '97's are different than prior years.

FCP Groton, on 06 August 2009 - 03:02 PM, said:

Great write-up. It is much easier to follow when you have pictures.

Thanks. Which parts do you carry ? I think you have the o-rings, do you also have the screens ?

[TorqueSteer]

matt b, on 06 August 2009 - 03:09 PM, said:

This was done on my wagon (see sig), the info at the top of the sheet was only related to the injectors. But maybe '97's are different than prior years.

Yeah 95 and 96 T5 definitely have the top rubber return hose going to the regulator. Ive never seen a 97, so I cant say. I also noticed that the fuel rail itself is different than the 95 and 96 T5 design



Also just want to double check because I didn't see any in the pictures, but you have these lower seals in there right?

[erikv11]

TorqueSteer, on 06 August 2009 - 03:17 PM, said:

Yeah 95 and 96 T5 definitely have the top rubber return hose going to the regulator. Ive never seen a 97, so I cant say. I also noticed that the fuel rail itself is different than the 95 and 96 T5 design

It depends on what kind of fuel system was put in the car, there were two kinds "return" and "non-return". My 96 N/A has the non-return fuel system: only one hard metal line, no fuel return line. They have different fuel pressure regulators too.

[Big Will]

Nice write-up Matt! Thanks for taking the time to take pictures and do this.

+1 for CruzinPerformance. I've sent 3 sets of injectors out to them I think over the years and they offer a good service.

[TorqueSteer]

erikv11, on 06 August 2009 - 03:52 PM, said:

It depends on what kind of fuel system was put in the car, there were two kinds "return" and "non-return". My 96 N/A has the non-return fuel system: only one hard metal line, no fuel return line. They have different fuel pressure regulators too.

Wow I had no clue that 850s had non-return systems, I thought they were only on ME7 S70 and up.

[7 VII 7]

my S70 NA has a "Non-Return"

my 850R has a "Return"

[matt b]

Thanks for the input guys.

Ben: The fuel rail in the last pics is taken off a 98 T5. In the first pics, it's my stock 97 low pressure turbo rail. Neither has the rubber hose, but the wagon does have a hard return line, it's hooked to the white clip in the center of the fuel rail.

As for the seals, the 98 T5 didn't have them but the wagon had them, buried in the bottom of the fuel rail holes. Since I switched to the whole 98 set up, I did away with them. But I plan on using them in the 96 NA when I swap those injectors out tonight, assuming it needs them.

[iitywyswm]

Thanks Matt This thread is exactly what I was looking for. I have a fuel rail with from a 98 V70 T5 The car had a bout 70k miles when it was totaled. I have a 95 855. I have already installed the turbo and exhaust system. What am I going to have to do when I go from the 315cc/min to the white 350cc/mm injectors? Granted it is only a 10% increase but I don't think the engine is going to figure out what to do with the extra fuel on its own..Any help on this would be appreciated.

[bergmjs]

Holy thread resurrection.

You'll need a retune to adjust the fuel maps to get the full benefit of the upgrade.