Well, I did another test and tried an old trick I remembered. I put 1/2 an ounce of oil in each cylinder before testing and got readings over 220psi on all cylinders. And since the oil settles on the piston, and not the valves, this shows that my rings are bad i guess.
What got me worried enough to check this out in the first place was this....
On the interstate @70mph, the car would pull 12#'s of vacuum.
I had 2 coils die and I drove around for a few weeks with intermittent spark.
After replacing coils, car ran fine, but not only pulls 9-10#'s of vacuum @ 70mph.
..This shows the engine is working harder to keep the car moving.
My theory, which could be WAY off, is that while those coils were misfiring, it allowed the fuel to wash the cylinder walls of oil and damage those cylinders. (The 2 low cylinders are the ones that had bad coils)
Now I do want to rebuild the motor with forged crap, but not now, or any time soon. Is there anything I can do to squeeze 5-7K more miles out of this motor?
And has anyone else run 11# of boost on a motor with 95K miles?
Well, I did another test and tried an old trick I remembered. I put 1/2 an ounce of oil in each cylinder before testing and got readings over 220psi on all cylinders. And since the oil settles on the piston, and not the valves, this shows that my rings are bad i guess.
What got me worried enough to check this out in the first place was this....
On the interstate @70mph, the car would pull 12#'s of vacuum.
I had 2 coils die and I drove around for a few weeks with intermittent spark.
After replacing coils, car ran fine, but not only pulls 9-10#'s of vacuum @ 70mph.
..This shows the engine is working harder to keep the car moving.
My theory, which could be WAY off, is that while those coils were misfiring, it allowed the fuel to wash the cylinder walls of oil and damage those cylinders. (The 2 low cylinders are the ones that had bad coils)
Now I do want to rebuild the motor with forged crap, but not now, or any time soon. Is there anything I can do to squeeze 5-7K more miles out of this motor?
And has anyone else run 11# of boost on a motor with 95K miles?
well, here's my problem... If I had a supercharger, I would remove it... But i currently have a T-70. I'm running on average 10.9:1 A/F and a local shop called modular madness did the tuning. At the last dyno pull It was making 468/555 at the rear. I tried lowering the boost, but I got a CEL because I was running rich due to less boost. I would have to get a re-tune to drop boost and thats $450.
...I guess I could drive normal, but I'm sure everyone on here knows how hard that is...
Is there any way to verify if the problem is the head gaskets?
What places do leakdown tests and dont charge out the a$$ for it?
You can pick up your own leakdown tester at just about any parts store. The inexpensive ones usually run around $50-$80. All you need is access to a compressor.
Another advantage to doing a leak down test is you can almost always hear where the leak is coming from. If it is getting by the intake valve, you should be able to hear it reversing back into the intake manfold. You could open the throttle blase to listen even better.
If it is going past the exhaust valve, you should be able to hear it going through the exhaust. I actually put my ear to the tailpipe. You would be surprised how well you can hear a significant leak through an exhaust valve.
If it is getting by the rings or valve guides, you will hear the escaping air through the PCV valve opening or the oil filler neck.
Here is a decent writeup:
http://www.moddedmustangs.com/forums/cylinder-leak-down-testing-vt3705.html
one more thing... What is the "standard/acceptable" leak down percentage?
What is normal? And what is the limit?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?