Electronics > Beginners
Is this a bad sensor or are my O-scope settings off?
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McKay420:
After cleaning the injectors, the idle problem is still there, but it runs perfectly for the first 10 minutes now, compared to 1 minute before the cleaning.  Also, the acceleration hesitation reduced by about 80%.  There is still a slight hesitation, which after messing with it tonight, I figure could be the accelerator position sensor.  At 300,000 miles, it's seems very likely that it could be the rest of the problem with the acceleration.  I can squeal my tires now whenever I want (more like a "squeak" and not a squeal), which wasn't possible before.  The irritating part of the night, though was after starting the vehicle after reinstalling the injectors, my cheap $30 wifi scanner completely went to s***.  If I can't send it back, I may have to dissect it and see if there are any burnt traces or components.  It looks like it's just getting no power at all and I've tried it in 2 other vehicles.  Definitely gonna drop at least $100 this time on a new one, but who knows how long that will be.  It's driving me nuts not being able to read my fuel trims and other data.
Gregg:
I assume the fuel pump should draw 7 to 8 amps to pump 52psi to 8 injectors and would be quite surprised if the old pump can maintain the pressure drawing only 1.5 amps.
If the crankcase vent hose keeps filling with oil, the problem is more than valve stem seals; probably combustion products leaking past the rings.  It maybe the cylinder you found full of fuel, but coolant is the worst for making rings stick.  If you are losing coolant and can’t find where, it may be a head gasket problem. 
The best way I know to replace valve stem seals without taking off the heads is the compressed air through the sparkplug hole method. Don’t try to keep the engine at TDC with compressed air in the cylinder because if the air pressure should decide to rotate the crank while you have the valve spring off, it can cause the valve to fall in.  In other words, let the air pressure push the piston to BDC before taking off the valve spring keepers and make sure the cylinder doesn’t lose pressure.  A squirt of oil will help seal the rings.
Another relatively inexpensive diagnostic you may want is one of the USB otoscopes that you can look into the cylinders and see how scored they may be.
If you are considering rebuilding the engine and keeping the vehicle for another 200K miles or more, consider buying a brand new crate engine.
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