Low Compression Help and Possible Fix - ACDelco X66P

JohnnyTightlips

JohnnyTightlips

Motorhead
Greenie N00B Member
Greenie Member
This has helped a few cars in the past with low compression to free up rings that have carbon build up.

  1. Get the car hot then let take out the plugs.
  2. Pour 4oz into each cylinder
  3. Let it sit overnight or a day or two.
  4. Suck out the fluid from each cyl.
  5. Change your oil as it will seep into it, do some cheapo oil.
  6. Drive the car for 50ish mile with decent revving and engine braking, similar to a motor break in.
  7. Change the oil to the good stuff and then check compression when you get a chance.

ACDelco X66P Fuel Injector and Upper Engine Cleaner - 16 oz
 
The 6 cylinder Engine restore crap from "restore" has always worked well to get some final life out of people's engines. Specifically the 6 cylinder version. Although I'd never condone or recommend any of this crap, I've seen it work as a "bandaid" many times.
 
Is there an alternative to that ac Delco x66p that isn't discontinued and doesn't cost $100+ on ebay to get ahold of?
 
Had compression test done 200-190-150-180. They said when they added oil to cyl 3 compression increased. 123k on the engine. Was going to buy a used one and swap it but thought maybe this could help while I save a little more funds. Think it’s worth it?
 
Jmt3388 said:
Had compression test done 200-190-150-180. They said when they added oil to cyl 3 compression increased. 123k on the engine. Was going to buy a used one and swap it but thought maybe this could help while I save a little more funds. Think it’s worth it?
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It's not super hard to do or spendy so it might be worth doing if you have the time. If anything it won't hurt the motor just clean up some carbon around the rings.
 
I work for GM and have used this stuff to correct issues with carbon on valves but never for oil consumption/low compression. It is definitely strong and should work for that purpose.

If you decide to clean your valves with this stuff, simply rotate each cylinder where the intake valves are closed.

Fill the port with the fluid and allow it to soak for 3 to 4 hours.

Take a plastic pick tool and scrape around the valve stem area where most carbon builds up.

Use a mighty vac or suction tool to remove excess fluid.

Repeat on the other ports.

After cleaning the valves this way you will smoke a little bit but should clear up. You could also pour some onto the butterfly valves in the manifold to clear up any carbon built onto them.
 
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