94 injectors and their longevity

[apossiblehybrid]

my car is a 94 q45 with 88,000 miles. so last week i was driving around and all the sudden my CEL goes on. the car immediately starts shaking a lot. i find out thats its my #6 injector that is at 1.2 ohms whereas all my other ones are at 12.2. my question is do you guys think i should rebuilt them all or just rebuild that one injector? will the other injectors last for a while? thanks.

Modified by apossiblehybrid at 12:25 PM 11/6/2007
Modified by apossiblehybrid at 11:37 AM 11/8/2007

[96Qowner]

Unfortunately, it's the ethanol in that California gas, sorry. The Q injector housings react with ethanol, swelling up and pulling the internal windings apart. Although, your reading was odd - only 1.2 ohms? Usually the resistance goes high - to infinity.

NICO usually recommends new injectors, but if you're set on rebuilds, many here have used Deatschwerks:

zerothread?id=265393

No reason to replace any injector that ohms at 12.2 - it's in good shape, still. I believe Q45tech is still running his original injectors with over 300,000 miles on 'em.

[apossiblehybrid]

so i was thinking how you said my reading of 1.2ohm was odd. now im wondering could it be that theres an open circuit that could cause a low # reading?

[3Q Jay]

#6 requires plenum removal, at least partial.ohm 'em all and consider replacing all the marginal ones now. put the worst tolerance ones in slots 1 and 2 if you are not doing all 8, so that those can later be replace w/o pulling the plenum again.recommend the OEM 67u10 replacements (aka purple top). so far, no one has had a purple top crap out (at least that i've heard), so the sealing mechanism is presumed to be more ethanol tolerant.

only chevron (or top tier---vallero) premium, BG44K just before every oil change.

[Q45denver]

Rebuilt is a misnomer as they are basically just cleaned and tested. Failure at such low miles is unusual for phase 2 injectors.

[Q45tech]

Low miles per year means half the expected volume of gasoline passing thru the injector surround. 88k in 14 years should be around ~~ 210k.

Plenum removal gets faster with experience after you have removed one a few hundred times it gets down to a 2 hour process.............taking 6-8 for the first one.

Whether to change 1 or change 9 depends on your learning curve and tool box and facilities.

[goody90q45]

.....my question is do you guys think i should rebuilt them all or just rebuild that one injector? will the other injectors last for a while? thanks.

I've had my Q for two and a half years, bought it with 120,000 miles and have had to replace three injectors, one at a time. I one-upped the Infiniti gods again though since two of them were #1 and #8 and plenum removal was not required. I've only had to partially remove it once for that 3rd injector. I would say you can expect the same pattern since the nearest non-ethanol gas is a tank and a half drive away.

If you have the bucks then certainly replace all 8 FI and both KS along with every hose under the plenum. It will set you back a few grand but you'll be good for another 100,000 miles. If money's tight the plenum can be partially removed and shifted a couple inches out of the way to get to the #6 injector.

If you know your Q spent it's first 88,000 miles in the Bay Area I'll bet you're under plenum hoses (and leather seats) are still in great shape and very supple. The 94 I parted out was from SF and the under the hood plastic and rubber was in really nice shape. Cool weather makes a big difference.

I haven't checked my injectors for a while but I think I have another one going bad.

[maxnix]

If you know your Q spent it's first 88,000 miles in the Bay Area I'll bet you're under plenum hoses (and leather seats) are still in great shape and very supple.

Cool and high humidity climates help, but underhood engine heat, old coolant and ozone are bad everywhere.