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Old July 23rd 05, 09:53 PM
Comboverfish
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Extruder wrote:
> My check engine light is on and the codes read bank 1 and 2 lean fuel. Any
> ideas on what's causing these faults.


Mostly upper intake plenum seals on the 3.8 V6. There are updated
seals and sealed bolts to cure this. The intake manifold to head
gaskets can leak vacuum (among other things) as well, but they are a
less likely cause of P0171 and P0174 codes, and more time consuming to
replace than upper plenum seals.

The seals shrink esp. when cold, and cause a cold start vacuum leak
sometimes accompanied by a rough idle.

Toyota MDT in MO

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