Question about 2003 Chevrolet Impala
I have a 3.8 impala that just had head gaskets intake gaskets new plugs and a new upper intake plenum redone and car still wont go lots of fire but plugs are soaked with gas why the fuel dumping and not starting (temp sensor???)
Dheck all your ground straps. Also, check your fuel pressure regulator with a pressure gauge. But if you have one ground off it can cause the car to overfuel. Hope this helps. Phil
Posted on Jan 19, 2009
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Posted on Jan 02, 2017
Tips for a great answer:
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the negative battery cable from your Nissan Maxima. Wait at least 10 minutes in
order to prevent the engine cooling fan from causing any potential harm while
your hands are near it. Additionally, the engine must be completely cool in
order to safely remove the air intake manifold.
a screwdriver to remove the hose clamps around the air intake duct. Gently pull
the duct from the rest of the manifold.
the accelerator cable, cruise control cable, hoses and electrical connections
from the throttle body. Coolant may be lost through some of the hoses, which
can be prevented by utilizing hose clamps or plugs. Be prepared with a catch
pan underneath the hoses to collect any major spills.
the spark plug wires from both the spark plugs and the retainers on the plenum.
Unbolt the distributor cap. Use a pen and tape to label each wire with its
location so that you can easily return each wire to its exact location once the
air intake manifold has been put back in place.
the ground strap, which is attached to the upper plenum of the air intake
manifold and use a socket wrench to loosen the bolts. There are 11 bolts on the
upper intake plenum.
the upper plenum, which should still be attached to the throttle body. While
the upper plenum of the Maxima's intake manifold is removed, it is a good idea
to clean the mounting surfaces as well as the inside of the manifold with a
stiff wire and brake cleaner. Use lint-free mechanics' rags to wipe away carbon
Removing the Lower Plenum
the cooling system by inserting a catch pan beneath the radiator's drain bolt.
Unscrew the drain bolt and hold up a 3/8 hose with a funnel on the end of it to
direct the coolant to the catch pan. Open the drain fitting with a pair of
pliers and remove the radiator cap.
the radiator hose from the thermostat housing and disconnect the electrical
connections from the coolant temperature switch and the coolant temperature
sensor. Label these connections with tape and pen as described above for the
upper plenum hoses and wires.
the bolts to disconnect the coolant pipes at the transmission's end of the
the bolts on the lower manifold by turning them in 1/4-turn increments until
they can be removed by hand. The manifold may need some gentle nudging to be
released from the cylinder heads, but do not pry it loose -- doing so can cause
damage to the sealing surfaces, leading to vacuum leaks.
a scraper to remove any gasket material and sealant from the outer parts of the
manifold and cylinder heads. Clean the mating surfaces with lacquer thinner or
acetone so that a new gasket can be applied to the lower manifold.
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