My '93 1fz-fe is burning about a quart every 500 miles. Oil leaks are minimal. Spark plugs only have a few thousand miles but wet oil on them. I also did a leak down test (first I've done). The results seem reasonable from what I've read, though a few cylinders leaked out the intake.
My thought so far is valve guide seals. I just had the original catalytic converters replaced (rattling and excessive heat) so I would rather stop the oil consumption sooner than later. Current plan is to pull the head in October or November and have a machine shop rebuild it.
Does this seem like a reasonable diagnosis and solution?
Also, anyone happen to have recommendations for a good machine shop near Knoxville, TN to do the head work?
Leak down test results, engine hot:
Cyl. Psi in. Psi cyl
1. 80. 70
2. 80. 70
3. 80. 72
4. 80. 65
5. 80. 69
6. 80. 69
I read 20% leak is considered normal. 25% excessive. Leaks were out crank case (seemed normal, all seemed the same, and some also leaked out intake (so leaking intake valves I assume). No bubbles in coolant and none seemed to leak out exhaust.
I did take a few cylinders up close to 100 psi and the ratio did not change.
Valve cover gasket and tube seals are new. PCV is new. Most of the common oil leaks have new gaskets (currently leaks a drop in the garage every few weeks). I've tried different weight oils. All vacuum hoses are new. PAIR removed, EGR currently disabled. All evidence suggests the head gasket is original.
My thought so far is valve guide seals. I just had the original catalytic converters replaced (rattling and excessive heat) so I would rather stop the oil consumption sooner than later. Current plan is to pull the head in October or November and have a machine shop rebuild it.
Does this seem like a reasonable diagnosis and solution?
Also, anyone happen to have recommendations for a good machine shop near Knoxville, TN to do the head work?
Leak down test results, engine hot:
Cyl. Psi in. Psi cyl
1. 80. 70
2. 80. 70
3. 80. 72
4. 80. 65
5. 80. 69
6. 80. 69
I read 20% leak is considered normal. 25% excessive. Leaks were out crank case (seemed normal, all seemed the same, and some also leaked out intake (so leaking intake valves I assume). No bubbles in coolant and none seemed to leak out exhaust.
I did take a few cylinders up close to 100 psi and the ratio did not change.
Valve cover gasket and tube seals are new. PCV is new. Most of the common oil leaks have new gaskets (currently leaks a drop in the garage every few weeks). I've tried different weight oils. All vacuum hoses are new. PAIR removed, EGR currently disabled. All evidence suggests the head gasket is original.