injector life

Jimbo370 · 05-27-2014, 02:39 PM

Are these pretty sound OEM injectors. no problems with ethanol or heat? I am almost at 60k and plan on keeping the Z for at least 8 yrs. My last 300zx started having injector problems like increase ohms and leaks around 120k. just thinking for future. Anybody have over 100k mileage yet.Thanks

gbrettin · 05-27-2014, 03:08 PM

I'm pretty sure OEM injectors are not compatible with ethanol what so ever.

Jordo! · 05-27-2014, 03:12 PM

If you mean the 10% or so added at the pump -- yes.

If you mean E85 -- you need to make changes to the whole system to use it, I believe.

L33T Z34 · 05-28-2014, 10:08 PM

At the 8 yr mark or 120k miles, its a good idea to pull the injectors and get 'em cleaned/flow tested- make sure they're still working properly. Also, the "injector insulators" will probably be rock hard and leaking so be ready to replace those (six).
Change these out @ the 8 year mark...the O-rings will probably be bad...
top fuel injector o-ring = 16618-8J000
bottom fuel injector o-ring = 16618-EA000

6spd · 05-29-2014, 04:24 PM

I've had a few VQ nissans come through my shop in the last couple years, all with over 100k on them, all with hard to detect misfires, all came back to injectors gone bad. Trend? Eh, maybe.

thsxtreme · 07-08-2014, 06:48 PM

I started smelling gas in my AC vents and under hood. I thought it might have been the Fuel pressure regulater, or line and ended up being 2 injector O-rings I have 75K miles. I had them replace all of them. It was covered under warranty. What would cause them to fail like that? I have been getting gas with 10% ethanol by my house the past few months

L33T Z34 · 07-25-2014, 10:02 PM

Quote:

Originally Posted by thsxtreme

I started smelling gas in my AC vents and under hood. I thought it might have been the Fuel pressure regulater, or line and ended up being 2 injector O-rings I have 75K miles. I had them replace all of them. It was covered under warranty. What would cause them to fail like that? I have been getting gas with 10% ethanol by my house the past few months

They just deteriorate...maybe sum Viton ones would last longer...

SouthArk370Z · 07-25-2014, 10:29 PM

I did a little looking and according to Ethanol Producers Magazine, "... nonmetallic materials like reinforced fiberglass, Buna-N, Neoprene rubber, polypropylene, nitrile rubber, Viton and Teflon meeting acceptable usage standards with E85."

Some of those materials are not really appropriate for use in this application, (eg, Teflon and polypropylene tend to cold-flow). L33T Z34's recommendation for Viton sounds like a good one. I saw some reports that BMW had problems with Buna-N o-rings.

Kalrez scores high on EtOh, gasoline, and high-temp scales but I don't know if the other properties would be appropriate for use on injectors.

05-27-2014, 02:39 PM	#1 (permalink)
Jimbo370 Enthusiast Member Join Date: Jan 2014 Location: Florida Posts: 466 Drives: 09 black 370z MT Rep Power: 11	injector life Are these pretty sound OEM injectors. no problems with ethanol or heat? I am almost at 60k and plan on keeping the Z for at least 8 yrs. My last 300zx started having injector problems like increase ohms and leaks around 120k. just thinking for future. Anybody have over 100k mileage yet.Thanks

05-27-2014, 03:12 PM	#3 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	If you mean the 10% or so added at the pump -- yes. If you mean E85 -- you need to make changes to the whole system to use it, I believe. __________________ Enjoy it. Destroy it.

05-28-2014, 10:08 PM	#4 (permalink)
L33T Z34 Banned Join Date: Jun 2010 Location: Ahnald, MO Age: 46 Posts: 387 Drives: 09 K51 G C Bw/S 6MT Rep Power: 0	At the 8 yr mark or 120k miles, its a good idea to pull the injectors and get 'em cleaned/flow tested- make sure they're still working properly. Also, the "injector insulators" will probably be rock hard and leaking so be ready to replace those (six). Change these out @ the 8 year mark...the O-rings will probably be bad... top fuel injector o-ring = 16618-8J000 bottom fuel injector o-ring = 16618-EA000 DEpointfive0 likes this. Last edited by L33T Z34; 07-25-2014 at 09:59 PM. Reason: part numbers

05-29-2014, 04:24 PM	#5 (permalink)
6spd A True Z Fanatic Join Date: Aug 2009 Location: South Florida Posts: 3,001 Drives: Q50RS Rep Power: 24	I've had a few VQ nissans come through my shop in the last couple years, all with over 100k on them, all with hard to detect misfires, all came back to injectors gone bad. Trend? Eh, maybe. __________________ -Jay- jonathanjamesphotographer.com

07-25-2014, 10:29 PM	#8 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	I did a little looking and according to Ethanol Producers Magazine, "... nonmetallic materials like reinforced fiberglass, Buna-N, Neoprene rubber, polypropylene, nitrile rubber, Viton and Teflon meeting acceptable usage standards with E85." Some of those materials are not really appropriate for use in this application, (eg, Teflon and polypropylene tend to cold-flow). L33T Z34's recommendation for Viton sounds like a good one. I saw some reports that BMW had problems with Buna-N o-rings. Kalrez scores high on EtOh, gasoline, and high-temp scales but I don't know if the other properties would be appropriate for use on injectors. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

05-27-2014, 03:08 PM	#2 (permalink)
gbrettin A True Z Fanatic Join Date: Oct 2010 Location: Portage, MI Posts: 2,237 Drives: Tricycle Rep Power: 542172	I'm pretty sure OEM injectors are not compatible with ethanol what so ever.

07-08-2014, 06:48 PM	#6 (permalink)
thsxtreme Base Member Join Date: Mar 2014 Location: Oklahoma Posts: 3 Drives: 2009 370z base+sport Rep Power: 11	I started smelling gas in my AC vents and under hood. I thought it might have been the Fuel pressure regulater, or line and ended up being 2 injector O-rings I have 75K miles. I had them replace all of them. It was covered under warranty. What would cause them to fail like that? I have been getting gas with 10% ethanol by my house the past few months

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