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Valve Stem Seals Differences

So looking at replacing my valve stem seals and notice a couple big differences between FelPro (SS72861) and GM Genuine (10212810,12564852) seals. First is that the GM Genuine exhaust and intake are separate product numbers and look different, while the FelPro set supposedly has both but they...
- pkufeldt
- Thread
- Oct 4, 2023
- Replies: 13
- Forum: Engine Performance + Maintenance
Instant 10psi drop in fuel pressure

I have a 1999 K1500 Suburban with a 5.7l. It exhibits an instant 10psi drop in fuel pressure when the fuel pump stops while doing a key on engine off test. It goes from 61-62psi (in spec) while the pump is running to 51-52psi (out of spec) when it is off. It holds there. I have followed the...
- pkufeldt
- Thread
- Sep 15, 2023
- Replies: 20
- Forum: Engine Performance + Maintenance
Misfires return

1999 Suburban K1500 5.7L 133k miles I have been tracking down a long standing misfire problem with my suburban and have done many repairs and tests along the way in an attempt to fix. Here is the sequence: P0300 and P0306 DTCs appear Arbitrarily replaced plugs, wires, disty rotor and cap...
- pkufeldt
- Thread
- Aug 2, 2023
- Replies: 5
- Forum: Engine Performance + Maintenance
Newbie Looking at O2 sensor data

Pretty sure I have wrecked my cat but I thought I would post something and see if anyone could help confirm. Just finally fixed a long standing misfire stemming from a worn distributor. As part of diagnosing the misfire, before I figured out it was the distributor, I replaced the stock SFI...
- pkufeldt
- Thread
- Jul 24, 2023
- Replies: 7
- Forum: Engine Performance + Maintenance