Fuel Injector Question

[tricountytrail]

Looking for opinions anyone think this injector was leaking cylinder compress on that cylinder.
Pintel cap was missing on removal but oring was found in manifold. Engine was low on power checked plugs wires fuel pressure reg for paint all good. Compression test is next once injectors are back. Rethinking maybe I had a compression leak in the number 4 cylinder where the Pintel cap was missing and maybe leaking thru that o-ring.


"Your set of eight Delphi injectors flow tested 'okay' right out

of the box ( after an initial exterior cleaning / de-greasing ), and


flow tested at about a 5 % flow balance ( 78 to 82 cc ). An 5 % flow


balance is not great for a used set of injectors, should be a little


better. Spray patterns were normal in all of the injectors. All of the


injectors held pressure ( no leaks ).
The engine would have run okay with these injectors, maybe a tiny


bit rough.
Will have them in the ultrasonic tank and finished tomorrow


morning. Should get a little better after cleaning."

First pic showing cylinder blowby
second pic is what all other injectors looked like.
Never heard anything noise wise but twin 496s and hatch was not open at cruise.
looking for thoughts.

 

[Bondo]

Ayuh,..... Yer injectors sit in the intake manifold, not in the head, so a loss of compression is either rings, or valves,...

 

[alldodge]

Should have the injectors flow tested from idle to at least 5000 rpm. If they do not balance then need to be replaced if cleaning doesn't fix.

If the O ring was not sealing very well there would be a vacuum leak which would impact idle and performance.

 

[rustybronco]

Injector cap remains could be on an Intake valve. Compression and leakdown tests are in order.

 

[QBhoy]

You may have a more serious issue if the injector wasn’t fuelling properly (if I’ve read you right). You may have a damaged valve or worst case a damaged piston as a result. Hopefully not.