Infamous93Max

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

internetautomar

iTrader: (30)

yes, it will hurt your mileage.

Infamous93Max

I had a feeling, because that's the situation Im in...

MAXIMUS G EKSUS

what is your mpg city/highway ?

e46mike

you can check the resistances on the injectors to see if they are about to go.

aminus21

iTrader: (14)

yes like he ^^ said, check the resistance with a multimeter. should be 10-14 ohms per injector.

e46mike

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?

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?

Infamous93Max

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

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.

92 Max

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.

bvtran

iTrader: (3)

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.

92 Max

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.

alextothestars

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.

Hectic

iTrader: (20)

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.

92 Max

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.

Hectic

iTrader: (20)

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).

92 Max

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.

Sevorg1

cant beat the original dealership parts! Seems that was probably the main key. To bad dealership prices suck on everything

Sevorg1

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.

internetautomar

iTrader: (30)

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.

bvtran

iTrader: (3)

brian, you smoked too much j.k

internetautomar

iTrader: (30)

nah, I just talk to the rebuilders

Sublimejoe

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?

internetautomar

iTrader: (30)

try yourself, it's usually cheaper, unless you REALLY screw something up