Fuel in oil on new engine rebuild

[78 280zcar]

OK, I finally got to look at the fuel injectors. I built up pressure and it looks as though all the injectors are leaking. If I sent them into witchhunter.com, would the cleaning and such help the leaking or am I looking at new injectors?

Any comments please let me know!

Oh and I did a compression test, it was 130psi across the board. Tried putting oil in each cylinder and opened the throttle and tested them again all the same readings 130 across. I think I have a shitty compression tester, it looks 30 years old!

[78 280zcar]

any comments on my last post, anyone! My injectors came back clean and all good!

[scoutman75]

hey

do you have noid light? the wiring may be shorted and the injector spraying constantly

while its running,if the cyclinder isnt firing the fuel will get by the rings had the same problem with my 77 when i got it

[78 280zcar]

No I sure dont have a noid light, is there another way to test besides the troublshooting in the FSM. I tested everything that they had in the FSM and found no problems with the voltage or anything on the wiring for the injectors.

[First Gen Z]

You should also check the cold start valve. I that is stuck open you get a constant flow of fuel.

[78 280zcar]

I went ahead and sent the cold start valve in to get it checked with the injectors and they said it is still good. I will have to wait until I get them back on the car to see if it works out. I am really kinda concerned about the compression readings I got, thats pretty low readings arent they?

[kenz240z]

If the compression readings were similar wet & dry then the valves are most likely leaking. Perhaps it is time to take off the head & have it rebuilt. You'll be able to inspect the cylinders & pistons with head off. The engine block seems to hold up well with high mileage.

Were there any signs of the engine burning oil? Dark smoke out the tail pipe?

[Zrush]

Isn't it normally white smoke for oil burning and black smoke for a car that's loaded up or not burning all or most of the fuel? Wouldn't the spark plugs be totally trashed after this? (Dumb questions, sorry, but I'm trying to lean here)

Vicky

[kenz240z]

I should have said bluish smoke for burning oil...

Dry white smoke - running lean

Wet, wispy white smoke - burning coolant due to a coolant leak

Black smoke - burning rich

[78 280zcar]

Would it make a difference if I took the readings with the engine cold.

[LanceM]

Compression values depend upon the pistons used, the cc of the head, thickness of the head gasket, overbore, etc... 130 across all cylinders sounds good to me, differances between cylinders is what shows a problem. If your oil only smelled of gas and wasn't say a quart over full because of it I wouldn't worry about it with the short time you have been running it. Sure it wasn't a good thing but I don't see that it is worth the trouble for a tear down unless the oil filter is filled with metal filings. Pull the valve cover and look at the cam, you would probably see the greatest wear there first due to the pressures involved if you had really thin oil. With all of the injectors leaking you were running rich, and while it was shut off they leaked down and would have washed the cylinders down, but again how bad?? I'd say rings before bearings and at worst you have probably taken 10K miles off of the life of the engine, which with a rebuild is probably good for 200K anyway. Fix the injectors and drive it, if it's bad you'll know soon enough and it won't cost much more to fix it then if it is broke than to tear it down now and replace everything that still might be good. Just my $.02..

[78 280zcar]

Thanks for the replys guys. Today I put the injectors back on they are fine now and hold pressure. But now the car runs like it has a blown head gasket or cracked head:stupid:, now what! I was hoping as I told another guy is that there maybe water in the distributor cap or something like that but there wasnt. . There was water on the spark plugs when I pulled them back out, not coolant but just water, you know that smell when oil and water mix well thats what they smelled like. Oh and I forgot to mention that when I started it up a big ol puff of white smoke came out, "Yikes", what would that be?