4.9 help again

Yes im back and need more help. If you remember what was
happening before... well its the same thing. Fuel in the
oil, black smoke, high idle. and for some reason when i
just crack the throttle blades a millimeter it drops a
bunch in RPM and idles worse. It revs fine though...???
it has a fast and clean sounding rev, and idles ok. I
took the oil pan off and took a look and although i have
not completely checked all the cylinder walls, they look
good, no scoring. They are nice and shinny. Also as you
might not know, the 4.9 throttle body has two separated
blades, im assuming one for one bank and the other for
the other bank. Well i look in them and one is slightly
coated in a black layer, looks normal, but the other is
the same but wet with what i think is fuel. Also after i
finally timed it right (i think) it is idling really
high, like 2500. And when i turn the distributor till it
idles nice at 900 it indicates a spark after top dead
center. ??? the crank mark is off the marker chart. This
might be unrelated to my real problem but its still a
problem, maybe crank pulley was taken off and not put on
right? But anyway, could my other problem be really bad
rings ( But wouldnt it be blowing blue smoke?) or a stuck
injector? Low fuel pressure? Another thing to add, LOTS
OF FUEL IN OIL. Please help again... sorry. I just want
it fixed. I also took on to someone saying it could be a
bad sensor, but i dont have a scan tool to check codes,
but check engine light is on.

Ok, yeah i was hoping that wouldnt be an option but oh
well. I proly wont be able to get it to a shop, ill have to
bring the shop to me. I've got a couple friend mechanics.
But still any insight on the problem youd be great. I think
i could narrow it dont a bunch more. I can check a bunch of
things, and could proly get my hands on a code reader. Im
just so confused about the black smoke and not blue when
the oil is black within 40 mins of run time on a new oil
change and fuel in it. Plus i dont wanna pay 100 bucks for
a diagnosis when i could do what they do at the shop.
Thanks for the reply though!

And if it does turn out to be fuel on the throttle blade, take a look at the air filter. If there's a black spot on one spot, it's the PCV dumping a ton of oil/fuel, which would indicate excessive blowby (Which the compression test would've picked up).

I drained the oil and took the oil pan off to take a look
and the whole bottom end is really clean and shinny. No
indications of scored cylinder walls yet. I let it sit with
no oil pan for almost two days and found a puddle of gas
under the engine. I turned the engine about 2 revolutions
and im going to see if more fuel is found tomorrow. There
was a lot of fuel on the garage floor but could this have
just been leftover that eventually made its way down? Or
does this indicate a stuck injector. I will be installing a
fuel pressure gauge soon to see if pressure is being lost
overnight.

Thats what i meant haha sorry.

I just thought of something though... could a bad
thermostat make it run rich because coolant sensor is
sensing cooler temps and adds fuel? just a guess, and this
proly wouldn't be making it run rich enough for fuel to be
in oil.

Patrick wrote: orange wrote: I just thought of something though... could a bad thermostat make it run rich because coolant sensor is sensing cooler temps and adds fuel? just a guess, and this proly wouldn't be making it run rich enough for fuel to be in oil. Did you read my ?TID=2195&PN=1">Recent thread? No, a bad thermostat wouldn't lead to fuel being dumped like what you appear to be experiencing, although it would lead to a very rich running condition. I suspect you've got stuck (in the open position) injectors. Get that fuel pressure test done!

Thanks! Will do, and get back with you guys.

Cool, i will do that procedure. Could a stuck injector get
restuck after its free easily? The reason i ask is because
when i first tested them, 5 of 8 were stuck shut, and after
a night with 44k injector cleaner soaking they all worked
(at least clicked) when 12v was going to them. So im
confident they all fire but maybe one that didnt get
cleaned all the way got stuck open?

Oh and by the way, after i turned the motor a bit about 24
hours ago, there is more fuel on the ground coming from the
crank case. So im pretty confident i have a stuck injector,
whether this is my only problem or not.

CFoss wrote: I think that depending on the type you could get a click (open/closed), but not a full seal when closed.

Good point. An injector that opens and closes may not necessarily be shutting off completely when closed.

Doing a leak-down test using a fuel pressure gauge connected to the schrader valve on the fuel rail seems like the best option to me at this stage of the game.

 

Not from what I've seen. We're talking a very small amount of fuel being left over, most of it gets shot down the exhaust manifold and burns the catalytic convertor up. The engine will run choppy as hell if this is the case, and your check engine light will illuminate if it's a '96 or later engine.