I didn't remove the fuel rail to save time and not to mess with the injectors. I was following the ShopLife video. I may have to take the fuel rail off because of that last nut on the intake manifold.I'm not understanding why you didn't remove the fuel rail and disconnect the fuel line before you removed the intake manifold. IMHO, you've made your life much more difficult when you did that. If you're worried about putting the last nut back (in your other thread), remove the fuel rail so you have access. Problem solved.
Stick a shop vac with a crevice tool into the intake runners on the block side when you reinstall the intake manifold just in case something fell in.
I think 10 posts ago it was recommended that you change the upper and lower o-rings to the injectors. If you decide to do that, my personal preference is the label the injectors so they go back in the same sequence or better yet, do them one-at-a-time so they don't get mixed up. Having said that, I'm sure others will say it doesn't matter where they go back in
I tried P21 per MrMCar's recommendation to clean the engine. Holy crap I was impressed.
Don't forget the missing vacuum hose to your vacuum canister. It goes from the canister to a port on your firewall. 3.5mm ID vacuum hose.
Good idea to shop vac the intake runners before reinstalling.
I wasn't planning on changing the o-rings on the injectors since I wasn't taking them out but now I may have to.
Is this a good kit with Using Viton Fluoropolymer O-rings? $16.99 with Two Day Prime Shipping
Or should I just get the ones at FCP Euro?
$10.14 for 6 BMW Fuel Injector O-Ring (9.2 x 2.8mm) - Elring 13641437486
$5.36 for 6 Audi BMW Mini Porsche Fuel Injector O-Ring - Elring 893.889
Never heard of P21. Is the one you got?
$26.29 P21S 13001R Auto Wash Refill, 1000 ml
What missing vacuum hose to the vacuum canister? Do you have a picture or diagram?