Injector Pintle caps. weak point or normal
 

I had an injector finally go bad. completely dead on my 95 max.. run an ohm meter across the leads and get 0 I did notice the OEM tan colored pintle cap was cracked and missing all 4 little bits that go over the end of the pintle.
I checked the reading on the rest of the injectors at that time and they where fine but decided to do the remaining 5 injectors as well due to the pintle cap issue. turns out that all 6 were cracked and only 2 had 1 arm of the pintle cover left on it.
I am guessing this is more of an age related thing due to the fact my 95 has only 85K on it but will turn 20 years old in January. I will toss new seals filter and pintle caps on the old Injectors and put em aside in case I need em.

any thoughts on why the caps deteriorate or is this normal on any injector not just the Jecs ones.

I think they just get brittle with age. I had a problem with uncontrollable flooding earlier this year that turned out to be from two injectors with broken caps. I know other members who have found broken caps in the past year.

Attachment 20027

I'd say normal. That little piece of plastic goes through a ton of hot/cold cycles, so it's bound to fail sooner or later.

Every used Maxima injector I've inspected, the pintle cap is either cracked, brittle, and/or missing one or more of the four teeth..

here is the weird part. all the caps on the right or Rear bank looked new without cracks.and the front bank caps were destroyed.
yet all injectors were OEM from when the car was built.

Interesting observation. OEM exhaust too? My guess would be that the factory exhaust is slightly more restrictive to the rear bank than the front bank of cylinders. Notice how in the oem y pipe there is the join from both pipes into the "pre-cat holding area" lol.

That is weird and very different from my experiences. For me, all were equally bad.

I found broken caps on cylinders 2 and 5. But I replaced them all since I figured it would just be a matter of time before the others started breaking up.

Where is the best place to get replacement pintle caps & screens? Is rebuilding or new best?

You can get 6 refurbished injectors for $83 with new pintle caps, o-rings and screens
http://www.ebay.com/itm/3-YEAR-WARRA...ac2e62&vxp=mtr

or if you just want the pintle cap, o-rings and screen, then here's an example.
http://www.ebay.com/itm/Side-Feed-Fu...fd82b3&vxp=mtr

but you have to be careful on which vendor you order from, as there are two types of injectors so the screens will be different. See here

O-rings and pintle caps are the same, so no worries there. Screens don't really wear out, so you could just gently clean them yourself and just go with new o-rings and pintle caps...the parts that really matter IMO.

Thanks Wizard.

Also, thanks CS AR.