When should injector o-rings be replaced?

PsRumors · May 27, 2013

Had a conversation with Brian at BTS earlier this week and he mentioned it was probably a good idea to do injector o-rings due to age, truck has 131k miles.

What are some signs of needing o-rings? I have had several oil analysis done and nothing has been noted.

Patrick Feeley · May 27, 2013

Hard to say and it seems to vary a lot. My 94 was at 175k when the O-rings failed. Up to that point it started and ran fine and did not use oil between the 5k interval oil changes. When they failed it used 8 quarts in 150 miles. Some folks will see an increase in oil usage, some will start having hard starts (especially when warm), and some will be like mine (catastrophic). My 97 has 185k on the originals (knock-on-wood). Cheers!

mudslinger02 · May 27, 2013

Got a buddy that has 255k on his 97 250 original injectors & o-rings, hpop, hell even original fuel pump lol.

PsRumors · May 27, 2013

All righty. Seems I don't have any problems, no reason to repair some thing that ain't broke.

Tom S · May 27, 2013

I think that you are trying to head off having an issue that creates a hard hot start or sudden oil usage for instance.

TyCorr · May 28, 2013

I never changed the ones in my 00 until two years ago when I ran stg 2's for a while. Removed the.stock injectors at 258k and the orings were still.decent looking but were brittle upon removal. Now they are.back in their bores at 265k with new orings.

Justin@DP-Tuner · May 28, 2013

I wouldn't replace them until you have an issue with them. "If it ain't broke, don't fix it".

As for my 2001 7.3L... It has 244,000 miles with original injectors, o-rings, HPOP, turbo... The only time the valve covers had to come off was when I did glow plugs(which lasted 230,000 BTW).

TyCorr · May 28, 2013

Thats pretty much how I felt Justin. Mine made that suctiony sound when I removed them. Similar to when you take a bite out of a fresh peach....sssshhhhhhhhhhhhwwwwwwwppppop. It was pretty.obvious they were comfy.

Justin@DP-Tuner · May 30, 2013

TyCorr said:
Thats pretty much how I felt Justin. Mine made that suctiony sound when I removed them. Similar to when you take a bite out of a fresh peach....sssshhhhhhhhhhhhwwwwwwwppppop. It was pretty.obvious they were comfy.

Great way of describing it! LOL