Fuel Injector Question

[Robin Masters]

This is on a 1997 Fzj80… While chasing down a coolant leak coming from somewhere under the intake manifold, I noticed that a couple of my fuel injectors appear to be wet with gas.

Based on the collective wisdom here, is this most likely due to actual leaking injectors or 24 year old o-rings/seals? I’m not having any typical symptoms of bad injectors (aside from harder starting when the truck is hot). The injectors are $225 each, but is there a chance that I just need to replace the o-rings and seals? Do the injectors themselves typically develop leaks?

thanks for any help here!

 

[jpoole]

In your case I'd likely pull the injectors and have them serviced which should include testing and a before/after report on their health/performance. If service finds issues that potentially warrant replacement you can figure that out then but it's probably unlikely given what you've described and typical longevity of these injectors.

When they go back in use new seals (OE) and you should be good to go.

 

[mleichty]

This is on a 1997 Fzj80… While chasing down a coolant leak coming from somewhere under the intake manifold, I noticed that a couple of my fuel injectors appear to be wet with gas.

Based on the collective wisdom here, is this most likely due to actual leaking injectors or 24 year old o-rings/seals? I’m not having any typical symptoms of bad injectors (aside from harder starting when the truck is hot). The injectors are $225 each, but is there a chance that I just need to replace the o-rings and seals? Do the injectors themselves typically develop leaks?

thanks for any help here!

Agreed. I just had mine out during a head gasket job and there was some evidence of gas around them and they were loose in the holes and the rubber gaskets were hard and dried out. I had them serviced and they got them all back to factory spec. New rubber seals and everything is clean and dry.

 

[gummycarbs]

I looked into the cost of cleaning and rebuilding and decided that if it came up, I would just get upgraded OsideTiger injectors. They were cheaper than having mine cleaned locally.

OSIDETIGER

Every internal combustion engine requires maintenance for longevity. Basic scheduled maintenance consists of oil changes, spark plugs, belts, etc.

www.osidetiger.net

 

[zonker]

Why in the world would buy injectors on eBay versus having one of the top fuel injector service companies refurbish your OEM injectors for less money. Service the originals and they will definitely work perfect for another 150k+ instead of gambling on an unknown. Of course it is your choice and your money.

 

[Robin Masters]

Why in the world would buy injectors on eBay versus having one of the top fuel injector service companies refurbish your OEM injectors for less money. Service the originals and they will definitely work perfect for another 150k+ instead of gambling on an unknown. Of course it is your choice and your money.

What company are you referring to (for refurbishing the OEM injectors)? Thanks to all for the replies.

 

[cvenom96]

Refurbing and shipping mine cost ~$160 if I remember correctly. They showed the best improvement was only 8% (not bad for 316k miles). Was nice to have them clean w/ new seals and know they were good to go.

 

[Malleus]

This is on a 1997 Fzj80… While chasing down a coolant leak coming from somewhere under the intake manifold, I noticed that a couple of my fuel injectors appear to be wet with gas.

Based on the collective wisdom here, is this most likely due to actual leaking injectors or 24 year old o-rings/seals? I’m not having any typical symptoms of bad injectors (aside from harder starting when the truck is hot). The injectors are $225 each, but is there a chance that I just need to replace the o-rings and seals? Do the injectors themselves typically develop leaks?

thanks for any help here!

If you decide to have them cleaned and tuned, and if you, like me, live where there is at least one diesel engine repair shop, shipping will be the price of gas for the drive over. Since these are small injectors, compared to what they usually service, the cost will be commensurately reduced. I have all my engine work, large and small, done at a shop that services large diesel engines. They are always happy to charge me for the work, at a much reduced price I might add, because they don't have to strain their backs lifting my stuff, and I take the time to clean it before I drop it off.

Replacing the injectors with non-OEM parts isn't a mortal sin, since Toyota doesn't make injectors, someone should be able to supply them for less that the stealership price, whether that's direct form the manufacturer or not, IDK. I've not had the need to look into that.

 

[Njck22]

I've had three sets of 6 injectors serviced, all from 200k mile vehicles. Costed 120$ each time. Very little improvement needed on any of them. probably runs slightly smoother with the matched flow-rate though. I don't think I would send 80 series injectors off in future, just because of how little they degraded.

 

[mdawg]

I just got my injectors back from Witchhunter Performance. As stated previously, very marginal improvement in the before and after tests, which speaks to the quality of the injectors and the gas I've been feeding it. Glad I did it, but I could have gotten by by just replacing he seals and filters myself.

 

[TYM4FUN]

YMMV.

 

[mleichty]

Got mine done here: FIE Magnetos, Mechanical Fuel Injection & EFI, Fuel Injection Enterprises - http://www.fuelinjectionent.com/. They are local to me, but you can mail them in as well. Took about a week to get them done. I had similar results to TYM4FUN other than I had 2 that were about like his worst one. After cleaning, everything was really close across all 6. Don't know how much it helped with everything else I did, but it's running the best it ever has in the 9 years I've owned it.

 

[Shoredreamer]

 

[flintknapper]

I just got my injectors back from Witchhunter Performance. As stated previously, very marginal improvement in the before and after tests, which speaks to the quality of the injectors and the gas I've been feeding it. Glad I did it, but I could have gotten by by just replacing he seals and filters myself.

That's what I have always done. Ohm test each, clean them myself, replace screen filters and upper and lower seals. Nothing wrong with sending them off for cleaning and flow testing...but there isn't a lot they can do about it. Virtually nothing internal is serviceable.

A thorough cleaning is all they can do....then the 'flow numbers' are going to be what they are going to be. With a properly maintained fuel system....you shouldn't see much improvement.

 

[zonker]

I definitely agree.. clean and service them yourself if you have stuff to do it. If you are not sure on how to proceed.. I would send them out before I would buy a set from eBay. Not saying buying a new set is a bad idea if you have a reason to replace. I would just want to make sure what I was ponying up the cash for was the real deal. A fair amount of work that is kind of hard on the back should you have to do it twice.. should a purchased injector not function right after installing. Won't know until it is all back together and you start 'er up.