Question about 1999 Ford Taurus
Receiving message of emission evaporative system large leak on tester. Check engine light is on.
Error messages like this are typically caused by air leaks at one of several key places: (1) at the gas tank filler neck; (2) at the charcoal canister; or (3) one of the larger vacuum hoses under your hood.
A loose hose is probably the most common problem--over time, the plastic nipples to which those hoses attach weaken and can break off. Thus, a hose can look like it's in the right place, but it's not actually creating a seal at one end.
You can try to listen for this with the engine running and the hood open. Do you hear any kind of a "hissing" sound like you might hear when using one of those spittoon-things at the dentist? That's a major vacuum leak, right there. Many leaks aren't noisy enough to hear over the sound of the engine, though, so don't consider an absence of noise a statement that everything is just OK down there.
The problem at the fuel filler neck was endemic to certain GM vehicles, but it appears in other cars, too. Believe it or not, there's a vapor recovery hose that is attached at some point of the fuel filler neck to catch evaporation off the tank. Some cars also have another pickup right at the top of the gas tank, too. If one of these has worked loose or rotted, you'll start getting strange vacuum readings and a check engine light.
Hope this helps. Finding the cause of this problem usually takes more time (and money) than the actual fix.
Posted on Dec 02, 2012
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Posted on Jan 02, 2017
SOURCE: 2002 escape check engine light
The most common fault that Escape has with emission control is the EGR pressure sensor failing. The code for this is p0704 (from memory) and if this the the code you have then i recommend replacing that part first. This would not effect the cold start performance however, I would suggest that this is a separate issue. Recommend having the throttle body cleaned and the idle reset to help cold start issue.
Hope this helps, Mark.
Posted on Dec 03, 2008
P0453 is for the fuel tank pressure sensor. This code means that the voltage on the sensor was greater than 4.5V during key on engine off or during any engine operating mode.
Normal voltage from this sensor with no vacuum or pressure on the system should be 2.37 to 2.97V.
PCM sends a reference voltage of 5V to the sensor and tells if there is pressure or vacuum in the fuel tank by the voltage that returns from the sensor.
Possible causes are:
Usually it is a loose connector at the sensor or a bad sensor.
It mounts on top of the fuel tank,has a 3 wire connector. To replace it you have to push down on it and twist,if I remember right CC.
Posted on Mar 10, 2009
This code is refering to an area close to where you fill your gas tank. There is a box back there that has a job of capturing the gas vapors from your gas tank the computer in your car has found a problem in that system but it would depend on what the code said (small leak ) would be the evap box has a leak. If the code said (gross leak) it is a loose gas cap or bad gas cap . If it is the evap box you will need to have a shop hook up a smoke machine to find the leak
Posted on Mar 23, 2009
NUMEROUS THIS CAQN CAUSE THAT LEAK.U NEED TO FIL THE SYSTEM W/ A SKOKE MACHINE AND FIND THE LEAK WHERE SMOKE IS COMMING OUT.GOOD JOB FOR A SHOP
Posted on May 07, 2009
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