nunnink23

TG - But is 3858941 the right Volvo application? BUP posted earlier that my OEM injector Volvo # is 3857398, and SB mentioned that the Black/Yellow equivalent is 25170301.

Not doubting that those are the right ones, just confused with all the part numbers being thrown around haha!

BUP

that is the purple / pink marked injector for apps of the 4.3 L Gi . Volvo lists this for the 4.3 Gi
EF and WT models only. they do not list for any V-8's. that was an easy one to remember.

If I can find my list I can post the injectors Volvo used from mid 90's to 2001 or thru 02 TBI apps.

Have to get back to work.

Tail_Gunner

I am quite sure you will find this is the right injector but carry on..Bup does volvo use color codes on there injector's....Its priority tech is it not??? The key is being able to run at 30lbs of pressure and a 454 injector....ive tried to find the penta number with no luck.

http://www.dynamicefi.com/TBI_Fueling.php

SB

GM used color codes (paint marks) on the TB Injectors. Volvo/Merc/etc used GM injectors of course.
THe paint marks wore off pretty easy and over time. I believe they used this for easy reference in 'bins' when the vehicles where assembled.

nunnink23

I will try them anyway. The ones SB sent will be here tomorrow I think, so I will see if they work. If not I can try your set, and maybe the Walker set. I decided that if the new injectors don't solve it, I think I am going to invest in the Diacom.

nunnink23

TG - I will update everyone tonight after I try the new injectors. I will read that link over this afternoon as well. Thanks for the info. It does seem very hard to find the 30 psi injectors.

SB - Are the ones you sent me the equivalent of a black/yellow injector? I know you mentioned one of the applications was for a 454.

I read on a TBI performance website that some truck injectors that run at 13 psi will actually flow less under high psi conditions. I wonder if this is true.

Tail_Gunner

What a tangled mess ive crossed the numbers to the tj11 to a 90lb injector and the tj17 to a 45lb injector...Merc and volvo used the tj17 on all the blocks using mefi and tbi at 30 lbs psi....The original part number for the volvo... well std motor parts tried to duplicate that but was unsuccessful in the yr 2000. It seems running 30lbs psi with tbi injectors is a black art GM gave up on it in 95 the problem was repeatabilty by the way your fuel pressure regulator is also suspect running those at 30lbs is bit of a job so to speak. I to have been having a small surge issue when going to wot and have come to the conclusion that the tbi is on its way out and new carb is in my future. Intresting back to the future so to speak

nunnink23

Ugh. I am very nervous. My new injectors should be at my house shortly. I will be at my boat around 6:30 tonight to put them in... I really hope they work.

So the TJ 17's wont work then as a back up plan? I guess that means I only have the two walker ones to try (maybe)...

Were you mentioning I might have a fuel pressure issue? Im 99% sure I don't, because I haven't taken my gauge off yet, and it has been 33 PSI when running.

I just cant fathom what would go wrong on a TBI. They are so incredibly simple. Do you think converting to a carb will kill resale? I would love to convert to MPI. I already have the MEFI IV computer for it. Just need a manifold, distributor, injectors, and maybe a new wiring harness?

Tail_Gunner

Well you have to remeber a few things the tb is automotive and the injectors were designed and to be used @ 13psi....Volvo changed that or GM delphi who know's ...to run at 30 lbs which required different spring rate's for the pressure regulator and those rebuild kit's are no longer availible either and the same with the injectors's who really knows the original spec...Now you need to get that spray pattern or fuel delivery issue cleaned up and there's little reference points to work with. Its either injectors that cannot handle 30psi (they stick open) or your fuel pressure regulator (internal you cant measure it) Now if you can find a injector that can handle 30psi and is the right flow rate then your home..The 11's should work by cross reference as the 17's by cross reference but the 17's are clearly smaller than the 11's. So you have to play around with them i guess.... or find a authorized dealer who still has the originals in stock or you might just call obd and see if they know the original injector size or can recomend a new injector and and reflash your mefi 4 back to new again. Let's see how the new injectors work

nunnink23

No luck. Wont start at all now. Before it would start but with a ton of effort.. At least two mins of cranking. I just don't get it.

Are these injecotors smaller?

Also - I think I remember the factory ones sticking out of the pods further. But maybe I'm wrong.