I noticed oil in my fuel bowl so I ordered a full set of injector o-rings and ipr 0-rings. I've removed the injectors today and now I'm thinking I may just need to replace my injectors since I have 356,000 miles. The truck has always been serviced regularly and as far as I know these are the originals. I didn't do any injector tests before I took them out because I don't have any misses or stumbling, just tend to be low on power. I know I can't know the real condition without a complete test, but my gut is telling me that I would be better off just getting a set of reman and getting another 300K out of them. I should also mention that I recently switched to Synthetic oil because the NAPA guys gave me a super deal on it. The fuel filter was a little black before and now it's black.

Injector #1
https://drive.google.com/open?id=1OS...exTweHt6GhNsGA

Injector #8
https://drive.google.com/file/d/1DGZ...ew?usp=sharing

Driver Side

https://drive.google.com/open?id=1DX...Ck_6B0bpYRYElQ


Passenger Side

https://drive.google.com/open?id=1gV...PiHbGVLLvYGnww

 

In my experience synthetic oils flow better. One manifestation of this is increased oil leaks, including more leakage past iffy o rings. People look at me funny for saying synth oils leak more but hey, I believe my eyes. So I'd think the increased oil contamination on your fuel filter is due to switching to synthetic.

Synth oil also allows tired old injectors a bit more life as worn poppet valves are more free to operate, especially when cold. If you did not have cold starting issues on dino oil that suggests your injectors are not worn out. New o rings and get on down the road.

In your shoes (and if you can afford the down time) I'd have your own injectors rebuilt by a known specialist, like Rosewood. Generic rebuilds from NAPA or whatever have an uneven rep. Make that very uneven. Using your own as cores takes some variables out of the equation. A set of fresh quality rebuilds and you're good for many miles ahead.

If you have the coin and don't mind straying from the canon of Henry Ford, a brand new set of Alliant single shot AC injectors plus a mild tune on your PCM will vastly increase your grin factor and towing prowess. No downside except the cost of injectors and the tune.

 

^^^This^^^

Absolutely sound advice. If they were still cranking easily last winter on dino oil then they probably still have life left in them.

I would like to add P.I.S. - Performance Injection Systems to list of rebuilders.

Based upon the way a few of those injectors look, I would pressure test your coolant system and see if you have any leakage around the injector cups prior to placing the injectors back in those holes.

 

If I didn't have to pay for shoes and clothes and school supplies I would be all over that. Someday.

 

I was concerned about that also, but I just did a complete coolant flush and there was no fuel or oil in the coolant and still none.

 

I have read where a couple of the high mileage guys here say that the original injectors will last into 500,000 miles, IF they have had good care. Some replaced at 350,000 miles and did not see any difference in performance, which seems to indicate that the original injectors were still in good condition. The orings should fail before the injectors, in a perfect world.

 

I didn't have fuel in the coolant either when I changed injectors in the E99 . I did have a bit of rust on two of the injectors. I did the following test and found that I had a very, very slow leak into two cups...early stage of death on both.

Test from Tugly:

Coolant: Pull the small tube off the right side of the degas bottle. Shove a pen or a bolt in the hose and use the hose clamp on the tube to seal it. Using a rubber-tipped blower nozzle, puff up the open hole until the degas cap vents (you'll here a noise you should be familiar with for future reference). You'll then be about 14-15 PSI in the coolant.

Now, I don't put injectors back in without conducting the test. Takes about 5 mins. on a slow day.

Peace of mind....

 

I would suggest doing the injector cups as well. That way your not going back in later. 350+K miles on stock injectors is pretty damn good in my book!

 

Had never heard of testing it that way. I think I'll do that after work tomorrow. Thanks.

 

I'm doing injectors right now at 305K. No issues with injectors (easy start, no smoke, calm idle) but O-rings were on the way out. Decided to replace the injectors but not the cups. Saw coolant in most of the cups after a week of sitting after I pulled the injectors so decided on all new cups. When I pulled the cups out there was no sealant on the upper portion of the cup...on any of them (original cups from the assembly line).

 

I did not realize you had changed your mind about doing the cups, Brian... with what you found, you now have me rethinking my own situation.

 

So I did the pressure test and I can't see any signs of the cups leaking. I'm thinking at this point I am going to do new O-rings with my old injectors. I figure now I know how to do it and later if I decide to go back after the injector cups I'll plan further out to keep the truck out of commission and just take it easy when it's not so blazing hot. Maybe by then I can do Stage 1's with a tune. I'll also need to rent the injector cup tool from Riffraff, which will take just too much time right now.

The good thing now is that I'm getting the engine nice and clean. Our shop at work has a parts washer that makes it so much easier.

I also discovered that I probably have an exhaust manifold leak by the number 7 piston. So there's another project. Might as well do bellowed up pipes when I go after the manifolds.