Question about 2002 Mercury Cougar
I had to put a lot of gasket maker to seal the Upper Intake Manifold/ Plenum just so the vehicle would stay running, but hasn't kept the Lean code from reappearing. Is it possible for it to warp, because every single bolt that holds the Upper Manifold on is tight, yet it does not sit flush on the Lower Manifold.
You could take it to a machinery shop and have it machined but you would have to do both surfaces.
Posted on Dec 11, 2014
Testimonial: "Is it possible for the Upper Manifold to Warp?"
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Posted on Jan 02, 2017
SOURCE: Failed Emissions test. OBD
The trick to setting all the monitors is:
Make sure you have more than 1/4 tank of fuel but no more than 3/4.
Clear codes then Do Not cycle key off. Start vehicle and drive,make sure you do at least 2 minutes of steady spead between 40-50 mph and at least 2 minutes at 50-65 mph, usually about a 20 to 25 mile drive will set them..
If you turn the ignition off before the monitors complete then EVAP will have to see a 6 hour cold soak before it will attempt to run again.
Posted on Mar 24, 2009
SOURCE: V6 engine failure
Doubtful if anyone poured water in there. Your head gasket failed and allowed coolant to fill the cylinder overnight. This is called hydrolock. Coolant cannot be compressed so when the compression stroke occurs, the weak point is the connecting rod or the piston top which can simply cave in. This can also happen to vehicles when driving through flooded areas if the air intake is too low. Head resurfacing is normal and best way to prevent future gasket failure. The only thing you did not mention is if the mechanic checked the affected cylinder bore for bulge. The additional pressure that bent your rod can often push the cylinder walls out of shape. If that happens the rings on the piston will not seal, making the entire job worthless.
Posted on Sep 10, 2009
Testimonial: "This is the exact type of response I was looking for. Your information was extremely helpful in my understanding of the cause of failure. Thanks."
SOURCE: i have a 97 grand
Posted on Jun 11, 2011
Tips for a great answer:
Jul 23, 2012 | 2001 Buick Regal
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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