Quote:
Originally Posted by EC900
You done all the easy stuff. Could have a simple hidden vac leak. Tuning to and with a vac leak throws things up for grabs as I’ve found out, incl would be mixture. My vac leak came from under pedal cluster to brake booster, runs back thru tunnel hidden behind engine.
Seems the next step might be an eng. compression/leak down test to get idea on the overall performance. Condition of those old plugs would hold some clue as to type of fouling, as will new ones after a few more miles.
The smoke & oil substance would lead to believe time for a top end. How much smoke and how much oil spews out for how long (substance…water/moisture like bad gas or oil?)? Does smoking go away after few minutes. How’s the exterior leaks, possible head stud break or any noise from valve cover. On a well worn engine, rings and or valve guides has oil leaking into the cylinders is typical when engine sits for awhile.
What’s the mileage or rebuild history should be a clue, but the comp problem/leak test will verify.
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Wow brake booster leak. I haven’t tried doing a leak down test or compression test. Partly because it was running so good for months then suddenly one day ran poorly. Only 38k miles according to the title and the odometer, but could be wrong. The smoke clears up after a few minutes. Definitely oily substance from the exhaust. Like it’s way too rich. Has a couple leaks under the car that weren’t there when I first bought it. Didn’t notice any valve cover noises, but I can check again.