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Bad fuel injector = wasteful on gas?

Old 09-06-2006 | 03:08 PM
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Bad fuel injector = wasteful on gas?

I have a quick question cuz I have no idea what the answer is. Does a bad fuel injector waste gas or kills your gas mileage in any possible way?? Thanks in advance
Old 09-06-2006 | 06:03 PM
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yes, it will hurt your mileage.
Old 09-06-2006 | 08:22 PM
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I had a feeling, because that's the situation Im in...
Old 09-07-2006 | 07:36 AM
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what is your mpg city/highway ?
Old 09-07-2006 | 07:46 AM
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you can check the resistances on the injectors to see if they are about to go.
Old 09-07-2006 | 08:36 AM
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yes like he ^^ said, check the resistance with a multimeter. should be 10-14 ohms per injector.
Old 09-07-2006 | 12:22 PM
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I just replaced all 6 injectors and now the car is idling rough and mixture is too rich...
I've reset the ecu by turning that *** all the way clockwise and then counter clockwise.

any ideas?
Old 09-07-2006 | 12:40 PM
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If this engine has "O" rings around the injectors, did you replace the "O" rings and lube them with petroleum jelly? It's easy to damage these seals and have them leak. If you pull the plugs when the engine is cold, are they wet with gas?
Old 09-07-2006 | 01:22 PM
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Originally Posted by MAXIMUS G EKSUS
what is your mpg city/highway ?
I have no idea right now with my injectors down...

I know my injectors are messed up because I already had them checked out by multiple places and they all said the same
Old 09-07-2006 | 03:02 PM
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Originally Posted by 92 Max
If this engine has "O" rings around the injectors, did you replace the "O" rings and lube them with petroleum jelly? It's easy to damage these seals and have them leak. If you pull the plugs when the engine is cold, are they wet with gas?
ya i replaced the rubber O rings. I didn't lube them...probably should have done that. I pull the plugs when the engine is cold and are wet with gas.
Old 09-07-2006 | 06:03 PM
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Originally Posted by e46mike
ya i replaced the rubber O rings. I didn't lube them...probably should have done that. I pull the plugs when the engine is cold and are wet with gas.
As I understand you, the plugs are wet. So, yes the injectors or "O" rings are leaking gas into the intake and that's probably causing all of your problems (mix too rich). I, unfortunately, had to replace the rings three times before I got them to seal properly (trickier than it seems). I don't know of any tests to tell whether it is the "O" rings or injectors leaking.
From reading other info on the net, these "O" ring seals are very prone to problems when replaced.
Old 09-08-2006 | 10:46 AM
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don't mean to diss brian in anyway.... yup yup I know he's gonna start nagging at me for this post. he's gonna try to convince us his 6 new bosh injectors worth $600 lol when in fact for $600 bucks you get a new jap engine with water pump, injectors, maybe alternator too.... under lesser than 60K lol

anyway, if you guys wanted to save $$$ on rebuilding your injectors, instead of buying rebuilt injectors you could have them clean out by professional. it's the same process that your rebuilt manufacturer used and it's much cheaper. I think I'd paid around $60 for all 6 when I did mine last time. And of course, I assumed you guys had your injectors' resistance tested ok.

http://web.syr.edu/~bvtran/injectors.pdf

check it out.... sorry, I did it 3 years ago when I lived in SC and never had the time to write up all the instructions. If you guys are curious about doing injector works in anyway, rebuilding it, or simply looking to clean up carbon build-up from the trottle and intake. check it out those photos to gain your intuitions.
Old 09-08-2006 | 12:14 PM
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Had the injectors cleaned at an local injector outfit. Still had problems with leaking "O" rings. The injectors were working perfectly before, but I decided to have them cleaned and pressed when I had them out for my VTC job. Should'a left well enough alone.
Old 09-08-2006 | 04:59 PM
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ive never heard good things about replacing the injectors on these cars. everyone says they replace them and they start to miss! seems like the only fix is to buy a new VE or VQ and move on...mine are starting to go.
Old 09-08-2006 | 05:15 PM
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it's not that tough to avoid damaging the o rings or make a tight seal. just apply a little oil around the entire ring (or rings for ve), set it in the rail, put the hold down peice on and screw each side a little at a time until the injector is fully seated.. the oil is the key, the injector will slide in place much easier and with less chance of damage.
Old 09-08-2006 | 05:41 PM
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I had no luck with motor oil on the "O" ring. I was only able to seal it when I listened to someone here on Max.org and used petroleum jelly on the rings and fuel rail and carefully twisted the injectors into place. Seems that this is a well known problem. If you look at places on the web that sell these injectors I found several with disclaimers that usually initial failure of these injectors is usually due to damage to the seal when installing. Interesting that they made this disclaimer in the online catalogue.
Old 09-08-2006 | 08:31 PM
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Originally Posted by 92 Max
I listened to someone here on Max.org and used petroleum jelly on the rings and fuel rail and carefully twisted the injectors into place.
that could have been the source of the problem. it's a frickin tight fit and if you're sitting there trying to twist in down, you're causing a lot of friction, which might score the o-ring(s).
Old 09-09-2006 | 02:43 PM
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Originally Posted by Hectic
that could have been the source of the problem. it's a frickin tight fit and if you're sitting there trying to twist in down, you're causing a lot of friction, which might score the o-ring(s).
I figured that pushing straight down on the injector and "O" ring might pinch it and cut it. Anyway forth time was a charm and the "O" rings sealed. I also went to the Nissan dealer to get the rings. Theirs seemed to be a little harder than the ones I got at NAPA.
Old 09-09-2006 | 06:43 PM
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cant beat the original dealership parts! Seems that was probably the main key. To bad dealership prices suck on everything
Old 09-09-2006 | 06:47 PM
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What kind of fuel injector cleaner should I use. Is the best way to just dump the stuff from the can into the gass tank, or is there some other way it can be done to clean them bad boys.
Old 09-09-2006 | 07:39 PM
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Originally Posted by bvtran
don't mean to diss brian in anyway.... yup yup I know he's gonna start nagging at me for this post. he's gonna try to convince us his 6 new bosh injectors worth $600 lol when in fact for $600 bucks you get a new jap engine with water pump, injectors, maybe alternator too.... under lesser than 60K lol

anyway, if you guys wanted to save $$$ on rebuilding your injectors, instead of buying rebuilt injectors you could have them clean out by professional. it's the same process that your rebuilt manufacturer used and it's much cheaper. I think I'd paid around $60 for all 6 when I did mine last time. And of course, I assumed you guys had your injectors' resistance tested ok.

http://web.syr.edu/~bvtran/injectors.pdf

check it out.... sorry, I did it 3 years ago when I lived in SC and never had the time to write up all the instructions. If you guys are curious about doing injector works in anyway, rebuilding it, or simply looking to clean up carbon build-up from the trottle and intake. check it out those photos to gain your intuitions.
the reason the rebuilt injectors fail so often is because when they are cleaned the solution removes some of the coating from the injector windings which causes the corrosion and eventual failure of them.
Old 09-12-2006 | 06:40 PM
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Originally Posted by internetautomar
the reason the rebuilt injectors fail so often is because when they are cleaned the solution removes some of the coating from the injector windings which causes the corrosion and eventual failure of them.
brian, you smoked too much j.k
Old 09-13-2006 | 02:37 PM
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nah, I just talk to the rebuilders
Old 09-18-2006 | 08:01 PM
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Would it be worth it to have a full tune up done on my car as opposed to trying to get the seals to seat properly myself?
Old 09-20-2006 | 07:05 AM
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try yourself, it's usually cheaper, unless you REALLY screw something up
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