Quote:
Originally Posted by gabedrummin
Compression test shows cylinder 4,5,6 at 150 psi and 1,160 2 ,155 3 ,150 I used two different gauges and still got a difference of about 10 psi from bank 1 to 2 I also ran the car with cylinder 4 coil unplugged and it still backfire . Very confusing results . Bank one plugs looked black color where as bank 2 the insulators are cleaner .
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So your vacuum test is good.
10 psi difference as the greatest spread is ok.
So I think you valve train is good.
Blows my valve leaking theory all to hell thou.
Are all three plugs from bank 1 blackish???
Blackish plugs are either oil fouled or very rich fuel/air mixture.
Or not firing every time.
So you have to figure out if they look oil fouled or not burning well because of a to rich mixture.
What kind of fuel mileage do you get.????
I would get a spark tester the kind you put between the coil pack and the spark plug so you can test current to the plugs on bank 1
there is a chance your coil packs are not getting energized.
If so that would be a wiring issue.
If that checks out ok then I would look at the injectors.