[mackskibum]

Well gang- it looks like its time to tear into my 85 3.2. 112,000 mi, uses 1 qt-250 miles between outright burning and a rear main seal leak. I have been chasing a miss/rough idle for a while and decided to get serious this afternoon. Performed a leakdown test as follows:

Luke warm engine, loosened plugs, ran for about 30 sec and removed. Leakdown and compression as follows:

1. 4%, 140psi
2. 4%, 140psi
3. 6%, 145psi
4. 40% 120psi
5. 10% 120psi
6. 40% 120psi

Looked ugly. Put new plugs in, drove until warmed up (oil cooler thermostat was open)

Looked at #4 and #6 again.

#4 remained the same- 40%, 120psi.
#6 got better- 12%, 140psi.

Removed leakdown tester, ran 50psi shop air into the adapter for the tester, inserted plugs into the two cylinders that had air pressure coming out. Leak is to the exhaust.

After the test run (10 miles or so) plugs 1,2,3,4,6 looked normal. Number 5 was already black with soot. I believe this to be from the DME compensating due to the dead #4.

Do you think top end will cure my mess or am I in complete deep *****?

Thanks for looking!

Dave