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New Injectors and Glows

Will L. said:
It is normal for fleet vehicles to only change bad injectors. It is not the best choice but I have done it many times by order of the boss man pinching pennies with no problems. If you send the other 2 back having them repaired while you drive w/2 old ones it shouldn't hurt anything.

Ak is right the proper procedure is to hold under pressure for 2 minutes (after final verification of pressure +10 cycles) to ensure no leaks. I would even consider sending all 8 back to him or a different shop to double check pressure if he missed this easiest part of the job detail.

I'm not sure which "Dad-ism" to use here- it's always faster to do it right the first time than to do it over Or if you want something done right you have to do it yourself. I feel your pain nothing worse than expecting what you pay for and being disappointed. I would hit him up for labor time or discount unless you use Him frequently and this is an oddball mistake out of his shop. He should pay for the rest of s/h charges regardless.
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Problem is, he was highly recommended HERE. He used to post HERE on the subject of injectors. Unfortunately, when others HERE asked whom I used, I referred them to him.

The postage is like $5, so no biggie on that. Just need to get this resolved. I will install the old injectors as an interim solution.
 
Wasn't trying to blast the guy, hopefully he'll get you squared away. I've made my share of mistakes, too. It sounded like this was an ebay/rockautodeal where you might be in for a problem. Good to know it's a trustable source.
 
Here's his response on this:

Unfortunately I can't test the injectors at as high of pressure that the injector pump puts on them. The tester only goes to the set pop pressure while the injector pump can get as high as 4000 psi or higher.

Most times a leak can be fixed by just tightening the top of the injector to the bottom. I do true the mating surfaces during rebuild but they are assembled while cold.

To tighten , Take the high pressure line loose[doesn't have to be all the way] Hold the hex part of the injector body and tighten the top using the 2 flat sides. Get them as tight as possible, re-tighten high pressure line. Hopefully this will fix the leaks.
 
OK, I went over to my son's at lunch to work on the injectors. Pulled both the suspect injectors, tightened them as hard as I could using a crescent wrench on the upper portion and socket on a breaker bar for the lower portion. Reinstalled, they still leak. I replaced the front injector with one of the old ones. I then installed clear pvc tubing on all the return lines thinking I could further trace down the leaks. The front (old) injector produces a constant stream of tiny bubbles on the front return line and an occasional tiny bubble on the rear return line. Eventually the front (old) injector shows fuel underneath. The rear injector shows fuel underneath and an occasional tiny bubble in the return line. The third injector back shows no bubbles and no leaks. The second injector back shows some fuel leak and an occasional tiny bubble.

How should I proceed to trouble shoot this? Should I again replace the front and rear injectors with old ones? Try to tighten the second injector?
 
Update:

Could never get the two injectors in question to seal, so I'm sending those back. I've got two of the injectors I took out back in the engine and no leaks. I've got clear pvc lines installed for all the return lines on the driver's side. The first injector (old) generates a continuous stream of tiny bubbles. The other 3 injectors on that side let off an occasional tiny bubble. That said, the return lines never clear of air and there are large air gaps in the lines between the other 3 injectors. The engine starts and runs fine.

So, if the engine starts and runs fine (i.e. no shudders or shakes), then can I conclude that the air is not in the system pre IP? Can I conclude that the air is normal from opening and shutting of the injectors during operation?
 
I had a local shop in Idaho rebuild mine. I got the India Bosch Nozzles off of Rock auto, and the 1993 German Bosch cores off of e-bay. the cores were super dirty and had to soak in the bath for a day. he did good, as they dont leak, but just labor and shims and shop suplies (as I supplied the major stuff) was 168 bucks, so not cheap.


I cringed at bending the lines out of the way, but no issues seemed to have arisen, so I guess we are good there.
 
GM Guy said:
I had a local shop in Idaho rebuild mine. I got the India Bosch Nozzles off of Rock auto, and the 1993 German Bosch cores off of e-bay. the cores were super dirty and had to soak in the bath for a day. he did good, as they dont leak, but just labor and shims and shop suplies (as I supplied the major stuff) was 168 bucks, so not cheap.


I cringed at bending the lines out of the way, but no issues seemed to have arisen, so I guess we are good there.
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I only moved the lines enough to get the injector socket in place, so whatever bending was slight.
 
Bending them a little should be ok, they dont have a coating like some people say they do. I promise, I cut mine with a small tubing cutter and there isnt anything weird.
 
tanman_2006 said:
Bending them a little should be ok, they dont have a coating like some people say they do. I promise, I cut mine with a small tubing cutter and there isnt anything weird.
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It's not like you're bending them at an acute angle. You'e simply pushing them out of the way. If things are going well with the engine, you only need to do this 2 or 3 times during it's lifetime.
 
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