Q45 Injector help

Post by **franknitty69** » Mon Nov 09, 2009 2:19 pm

So my #8 injector went out and i replaced it with a blueish/purpleish one from scottsdale. the original was like a whitish/greyish color.

anyways since replacing it the q is hard to start but only the 2nd time. so if i wake up in the morning, q45 starts right up. if i drive it somewhere, turn the engine off for a few minutes and then try to start the engine, it takes about 2-3 key turns to start (as if the engine is flooded). starts right up after 2-3 key turns though.

could there be something wrong with the new blue injector? maybe too much fuel during ignition? if i disconnect the injector the car idles rough, but this sympton goes away. if removed the injector and checked the o-rings and everything looks kosher.

any ideas?

Post by **goody90q45** » Mon Nov 09, 2009 3:24 pm

What P/N FI did IOS send you? A few of us have bought injectors and can look at our reciepts.

Your symptoms sound like a leaky lower o-ring. Any white smoke out the tailpipe? If you have a new replacement o-ring use it. Did the fuel rail cup feel smooth? Clean the cup and the upper o-ring groove with a soft towel and penetrant. Lube the FI up with Vaseline and try again.

Post by **Q451990** » Mon Nov 09, 2009 7:48 pm

It definitely sounds like a lower o-ring issue. I would remove it and replace the o-rings again. Clean the mating surfaces with a paper towel and brake parts cleaner. Then lightly coat the mating surfaces in the rail and the o-rings on the injectors lightly with motor oil.

Heath

Post by **Q45tech** » Tue Nov 10, 2009 7:45 am

Before wasting time. measure the leak down time of fuel rail fuel pressure below 34 psi.By crimping 2 hoses leaving engine you can decide where/which path the PSI leak down come from. Bad regulator, Bad fuel pump check valve, or leaky injector/oring.

Post by **Q45denver** » Tue Nov 10, 2009 9:30 am

If you value your engine, don't drive it till fixed or it may hydrolock.

Post by **franknitty69** » Tue Nov 10, 2009 1:23 pm

The part # I got is 16600-67U10

I tried it with the both new o-rings and with the new upper o-ring and old lower o-ring. The reason I used the old lower o-ring was because the new one was not as thick as the old one and there was significant space. The old one fits much better.

I will try reseating the injector.

Post by **Q451990** » Tue Nov 10, 2009 7:14 pm

Please post up the part number for the o-rings as well. Having extra slack in the lower o-ring is a disaster waiting to happen! It is imperative that the problem be correted if a mistake is being made at IOS or by Nissan in improperly cross referencing the o-ring to an incorrect part!

You should absolutely replace those o-rings again with new correct parts. They are cheap enough even if you have to get them at your local dealer...

Heath

Post by **franknitty69** » Tue Nov 10, 2009 7:42 pm

part # for the o-rings

16618-10V0516618-53J00

Post by **3Q Jay** » Wed Nov 11, 2009 11:06 am

those are the correct part numbers.is it possible that they were in 'generic' bags?if not in a sealed package with a nissan pedigree sticker you never know....even then, look for tell-tale signs of being opened and restapled, etc.

we all love IoS, but i have seen a few mistakes over the years.

Post by **franknitty69** » Wed Nov 11, 2009 11:11 am

they were def in generic bags with the part number written in magic marker.

i'll order another set.

Post by **Q451990** » Wed Nov 11, 2009 7:29 pm

Thank goodness you were experienced enough to know not to just put it in there with the wrong o-ring!

I would have a chat with Joe about this... a hydrolocked engine is not good for anyone.

Heath

Post by **franknitty69** » Mon Nov 23, 2009 6:46 am

Quick Question you guys, is the injector part # that you have been getting from ios 16600-67U10?

Post by **franknitty69** » Mon Nov 23, 2009 11:08 am

gentlemen, ios has verified (verbally) that for the fuel injector i purchased 16600-67U10 use the o-rings which i purchased (16618-10V05, 16618-53J00).

i've attached some pictures of the old injector next to the new o-rings for visual reference. you can clearly see the gap in the lower o-ring. the new injector has this same gap.

the old lower o-ring is much taller (less gap). i can take pictures if need be.

any thoughts?

Modified by franknitty69 at 4:15 PM 11/23/2009

Post by **maxnix** » Wed Nov 25, 2009 7:48 am

Vertical gap doesn't matter so much as radial gap.

Post by **Q451990** » Thu Nov 26, 2009 1:27 pm

I suspect that they flatten and push upward when inserted? I would certainly pressurize the rail before you bolt it down to check for leaks though...

Heath

Q45 Injector help

Q45 Injector help

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