Cracked Injectors and long crank

[DonMon]

After putting up with a long crank time for a little under a year now, I finally started getting misfire codes. I suspected it was losing pressure at the rail because the injectors had 120k miles on them and the top of the intake manifold and around the injectors was FILTHY! The rough starts got worse in the winter and that's about when the misfire started. Decided on 4 hole injectors from K-suspension. Install went great but I soon found the sorry state of the injectors.

I'm not sure how much this actually contributes to the long crank, rough starts, and misfires but every single injector had cracks and well as evidence of small leaks near the o-rings. Two of the injectors (can't remember which ones) even had weird yellow stains on the end.

New 4 hole injectors from K-suspension fixed my problems and now it idles better too, might even be more responsive. If you are thinking about upgrading injectors anyway, the K-suspension or Bosch ones are worth it. Don't be fooled by the sea of cheap fake ones on Amazon and ebay. Also don't expect a magical increase in MPG. That must be a myth along the lines of cold air intakes and such.

 

[Chris]

Those cracks in the injector aren't good, that's for sure.

4-hole injectors don't make any difference whatsoever, but new injectors will certainly give you these results. Especially when the injectors they replaced were in such awful condition!

 

[DonMon]

Those cracks in the injector aren't good, that's for sure.

4-hole injectors don't make any difference whatsoever, but new injectors will certainly give you these results. Especially when the injectors they replaced were in such awful condition!

That's the feeling I got. They're still nice quality but any injectors are better than the ones I had already. There are lots of people out there with anecdotal evidence of 4 hole making a difference but that's all it is, anecdotal evidence lol. One of the reasons I wouldn't waste my money buying brand new ones from bosch. The ones from Ksuspension are rebuilt and tested, and cheaper.

 

[Link]

I suspect if you tested the emissions on the same engine with 1 hole and 4 hole injectors, you might see lower emissions on the 4 hole injectors.

I recently replaced the heat shield and insulated the fuel rail and the #3 injector and I replaced the injector orings and cleaned the injector tips at the same time. There was definitely some gunk built up on the tips…interestingly the #3 had the most buildup. Didn’t see any cracks in my injectors though. Ran a little smoother and possibly a little more throttle response after getting it all back together.

Wonder what caused your injectors to crack?