I smell unburnt fuel from the engine bay when running-I'll try giving background (1 Viewer)

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Joined
Aug 28, 2003
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351
Location
Pearland, TX
I originally thought my problems may span from the TPS but...

But the more I am tinkering-the more I don't think the TPS is the
problem. I felt my engine was running VERY rich due to an unburnt
fuel smell I have been getting in just the last 10-15 days.

I have kept nearly immaculate service on this engine-replacing
EVERYTHING leaking, wrong, etc with "new" Toyota parts-anyone who
knows me knows I HATE aftermarket drivetrain products by experience.

I noticed a small sweating below the intake/exhaust manifolds against
the engine beside 5/6 cylinders. At first I thought it was my block
heater leaking a bit-so I drained took out, re-greased and installed a
new gasget, for tight re-install. The Sweating was/is sooo thin it is
hard to pinpoint its source and is too thin to put a finger on and get
enough to identify a smell. Then I thought it was my valve cover
gasget as I had done my valve clearances not too long before noticing
this-took off again-cleaned up-checked the gasget
texture/condition-all was good. the "Stain" of the sweating was
there-but I figured-"Yeah man, I got this licked now."

Now I get a bad fuel smell and within the last 10-15 days my mileage
has dropped by like 2mi/gal-highway. And while in Moab my bro noticed
a slight blow of darker exhaust-rich-but only one time in 3 days of
driving. I now think it may be my intake/exhaust gasget and the
intermittent "rich" looking exhaust is CPU compensation for lost fuel
at these cylinders from a leak-could I be somewhere on target here?

What says the list?? And I can't imaging the "split" I-manifold is
THAT prone to warpage. Do you think it may by #5 or #6 injectors??

I am somewhat strapped by time to do a long weekend fix, so wondering
if anyone may have some other ideas to hush my paranoia.
 
Look at your fuel injectors, seals started leaking on mine and the mileage dropped to like 6mpg.
 

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