Question about 2000 Ford Taurus

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I have a vacuum leak somewhere. I've changed the plenum gasket @ new plugs. I cleaned the plenum all surfaces, but when I switch on the defrost, the engine speed increases, but won't decel fast enough for me.

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Have a smoke machine put on it ,to find the vacuum leak

Posted on Oct 12, 2010


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What can cause the car not to start after changing the valve cover and intake gaskets?

Changing the intake gasket requires removal of distributor I believe. Did you get it back in the exact correct position?

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Engine misfire acura 01 mdx

Check out the fuel pressure and fuel flow. There is a filter basket in the injector ,just in side the where the fuel line connects ,it can be removed with a small self taping screw , take care not to damage it. also check the injector spray and volume of fuel injected over a given time.

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How to remove air from cooling system 1999 nissan maxima

Remove 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.

Use a screwdriver to remove the hose clamps around the air intake duct. Gently pull the duct from the rest of the manifold.

Disconnect 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.

Disconnect 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.

Disconnect 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.

Remove 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 buildup.
Removing the Lower Plenum

Drain 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.

Remove 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.

Remove the bolts to disconnect the coolant pipes at the transmission's end of the intake manifold.

Loosen 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.

Use 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.

Jul 08, 2012 | 1999 Nissan Maxima

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What you are doing is chocking the system and there is only 2 possible reasons why you can do this 1st you may have a large vacuum leak like the PCV hose or disconnected brake booster hose or intake manifold gasket,the other possible is the EGR is stuck open or a failed MAP sensor

Sep 13, 2011 | 1997 Chevrolet S-10 Pickup

1 Answer

Diagnostic code reading P0171 and P0174 already changed Mass Airflow Sensor and still getting same codes. What do you suggest next?

The most common cause for these codes is a vacuum leak and the most common cause for the vacuum leak is the plenum gaskets. With the vehicle cold you should be able to spray carb spray around the area where the plenum bolts to the heads and hear the RPM's change when you hit the leak. If this is the case the plenum gaskets are a fairly easy do it yourself repair.

Nov 08, 2010 | 2004 Chevrolet Tahoe

1 Answer

I have a pontiac grand am 2001 and it has a misfire on cylinder 3 and i changed the spark plugs and the coil packs and it didnt help much do you know what could be wrong with it?

A very common issue with these engines are fuel injectors going out on the 3.4 or 3.1L. Another issue are vacuum leaks around the plenum gasket. You can spray throttle body cleaner around the plenum gasket and listen for rpm changes.If the rpms change while doing this the plenum gasket may have a leak.

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1 Answer

Changing the spark plugs on a 2000 forerunner

the upper intake will have to remove the plenum to access the spark plugs...usually you are able to unbolt the plenum only and disconnect the front connectors and/or vacuum lines. and tilt the plenum up and out of the way to access the plugs... take care when doing this you can damage the engine if not careful. make sure you get a new intake plenum well as the valve cover gaskets...the rubber rings that seal the spark plug tubes from oil tend to leak causing a misfire. you already have to pull the plenum might as well do the valve cover gasket while you are so far in it.

Aug 22, 2009 | 2000 Toyota 4Runner

1 Answer

2000 ford windstar won't stay running

Sounds like you got a vacuum leak somewhere on that thing. Do you hear any hissing while its running. You can take some carb cleaner in aerosol can and spray it around the intake while its running to check for vacuum leaks. If it has one big enough the thing will change idle. Visually look for some sucked in vacuum lines on that thing. There is an IAC valve on top of the throttle body tap on it with a screwdriver and see if it idles. Lastly I hate to tell you those things were bad for upper plenum gasket leaks, you will need the upper plenum oring gaskets 6 I think, and the isolator bolts that hold it down, and 1 big upper plenum oring gasket. And the pcm will need a reflash when done should take care of the Check Engine Light.

Jan 26, 2009 | 2000 Ford Windstar

1 Answer

95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Nov 17, 2008 | 1995 Chevrolet Blazer

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