Question about 2000 Ford Expedition

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Po455code large leak changed gas cap check engine light came back on. whats most likely the issue and is there a port somewhere on the engine to smoke test it and find out where the leak is coming from

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Check engine light is on. EVAP small leak

You need to check the purge and vent solenoids for proper operation. You need to check the pressure sensor for out of range ( defective ). You need to check the filler neck for cracks and make sure the clamps are tight. You need to check the vapor lines for loose fit. I've seen at the charcoal cannister where the lines connect it may not be on strait. A smok test will reveal this if its not sealing. You may have a leaking rollover valve or fuel pump seal on top of the tank. You may just have a vacuum leak under the hood, These trucks have an Evap management valve also that can be leaking or out of specs. Look on the emmisions lable or vacuum chart under the hood. This will show you the underhood components.

Posted on Jul 15, 2009

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moparownr
  • 667 Answers

SOURCE: locating vacuum canister and testing it

The purge solenoid should be in the hard plastic vent lines that run under the tube between the intake and the air filter, ablove the transmission, it is common for vibration holes to be worn in the hard plastic tubes causing a vacuum leak. The purge solenoid is small and it has an electric wire coming from it. I 'think' your canister is in the front lower left corner under the hood, you may have to remove splash shields to see it. The problem is most likely in the hard plastic lines at the solenoid. Let me know if this helps.

Posted on Oct 27, 2009

  • 3 Answers

SOURCE: I have 1997 F150,check engine light came on, took

maybe a fuse is blown? did you have the mechanic check the fuses? or even check all your relays and wiring?

Posted on Dec 10, 2009

dttech
  • 4803 Answers

SOURCE: My 2001 Ford Escort ZX2 service engine soon light comes on and says I have a faulty gas cap or a vacuum leak?

It would be really nice to know EXACTLY which code you are getting. However, since you mentioned gas cap, I will assume that you are getting Diagnostic Test Code (DTC) P0457.

First, you need to understand that DTCs (or fault codes) NEVER tell you what parts to replace. They only tell you which of the many circuits and systems monitored by your onboard computer network is malfunctioning. The circuit or system must then be properly diagnosed to determine the actual CAUSE of the failure. To do that, you need to follow the correct diagnostic procedure and you also need to know how the system is supposed to work, so you will know a malfunction when you see it.

Here is what is causing your confusion:
The standard definition for DTC P0457 is "Evaporative Emission System Leak Detected (fuel cap loose/off)"
Please note here that the part about the fuel cap is in parenthesis. The MAIN description is "Evaporative System Leak Detected." This fuel cap part is only because this code is very often caused by people not putting their fuel cap on correctly, forgetting to put their fuel cap on at all or losing it, or refueling their engine with the engine running. So, this part of the DTC description is NOT telling you to replace the gas cap. It is only telling you to check for a loose or missing gas cap for a possible cause because it is so common.
What the code REALLY MEANS is that there is a HUGE leak in your EVAP system.

Please also note that a fuel tank pressure (FTP) sensor that is not working correctly can also cause the computer to "think" that there is a huge leak when there is not...Hence, the need for proper diagnosis.

The operation of the FTP needs to be verified to make sure it is not "lying to the computer. All of the hoses, lines, tubes, charcoal canister, and other components of the EVAP system need to be inspected for cracks, tears, breaks, etc. that would cause a leak in the system.

Posted on Feb 03, 2012

dttech
  • 4803 Answers

SOURCE: gas cap light and check engine light on 2001 ford taurus ses

Sorry, but there is no "sensor at the fuel cap". Therefore, there is no code that says "sensor at the fuel cap". There is, however, a Diagnostic Test Code (DTC) That indicates a possible problem with the fuel cap.
(HINT: When you want information on codes, it is usually wise to include the code number that you are getting - that way, it can be looked up, instead of GUESSING at what the problem is from a code description that some generic code reader is telling you..)
DTC P0457 is defined by SAE J2012 as "Evaporative Emission System Leak Detected (fuel cap loose/off)"

At this point, I am ASSUMING this is the code you got.

This DTC is set when the Powertrain Control Module (PCM) detects that there is an in-tank pressure drop that is more than 7in. H2O within 30 seconds directly after refueling, or there is excessive purge (fuel Vapor) flow more than .06 lbs. per minute. Possible causes are:
> Fuel filler cap not installed after refueling
> Fuel filler cap loose or cross-threaded

There are other malfunctions that can also cause this code to set, but it will be accompanied by other codes indicating other possible failures.
If there are no other Evaporative Emissions System codes present, then there is most likely a problem with the way your fuel cap was put on the last time you got fuel.

Check your fuel cap and make sure it is on correctly and is tight.

Posted on Apr 19, 2012

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1 Answer

How to fix evap lager leak on a 2006 chevy hhr


The light will go off, if the problem was fixed. Gas caps don't cause a large leak. Unless you put fuel in it with the car running. Large leaks are usually the vent solenoid stuck open, a break in the line or charcoal canister.

Feb 07, 2015 | 2006 Chevrolet HHR LS

1 Answer

Check engine light/evap leak


Getting a smoke test is the right direction to go in.
The computer vents the gas tank to the vapor canister while the engine is running. It also pressure tests the system for leaks. Some where between the gas tank and the vapor canister there may be a leaking hose or valve. Or it could be the gasket on top of the tank where the pump assembly went in.
The gas cap could have been a source for the leak, the other things are not involved.

Apr 24, 2013 | Oldsmobile Cars & Trucks

2 Answers

Check engine light came on went to auto zone said it was gas cap. Bought new gas cap. reset engine light. two days later check engine light is back on. what next?


Hi, if the code was P0455, there are other possible reasons. The computer fuel tank pressure sensor has detected a leak which could also be in the vapor canister, or the hose from the canister to the purge valve, or the purge valve itself may be leaking. Please inspect the system for these leaks. I may be able to provide some pics of these parts if you tell me your model, year, and engine info.

Evaporative Emission Control System Leak Detected (no purge flow or large leak)
What does that mean? This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
Symptoms You likely won't notice any drivability problems.
Causes A code p0455 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system
Possible Solutions With a p0455, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, and/or
  • Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary

May 14, 2011 | Chevrolet 2500 Cars & Trucks

1 Answer

Got numerous "tighten gas cap" messages. finally


computer is seeing a large evap leak. most common cause is gas cap left loose this is why it is throwing up that message. since you have already done that we know there is a leak somewhere else. look underr vehicle and should see a black rectangular box close to gas tank this is the evap canister check the lines hooked to this and just do a visual inspection of hoses see if one has come off. may need to have it checked out we have a machine that hooks into system and pressurizes with "smoke" the smoke leaks out of the problem area and helps diagnose .

Nov 22, 2010 | 2006 Chevrolet Silverado 1500 2WD

1 Answer

My engine light came on. The OBD reads emissions leak large. I have already bought a new gas cap and the light came back on. Any suggestions.


Why would you buy a gas cap?
You were told a large leak,diagnose those issues ,by having the EVAP System smoke tested and repaired

Oct 19, 2010 | 2008 Chevrolet Impala

1 Answer

My check gas cap light is on but no check engine light came on


The check gas cap light was in response to complaints of the check engine light being on for loose/missing gas caps. So now when the PCM sees a large EVAP leak the first thing it does is illuminate the check gas cap light (on models equipped with the light). Since it doesn't know if the gas cap is on or not it can have other issues like a vent solenoid stuck open which the PCM would be unable to distinguish between that and the gas cap left off.

There will still be a trouble code in the PCM for the EVAP system.

Oct 05, 2010 | 2005 Buick LaCrosse

4 Answers

Just failed inspection on my 2004 Grand Am (engine light is on) with a fault code P0455. (4C; 2.2L). What kind of damage am I looking at & can I fix this myself? Pretty please help me!


P0455 definition

Technical Description Evaporative Emission Control System Leak Detected (no purge flow or large leak)
What does that mean? This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine. you shouldn't notice any drivability problems.
Causes A code p0455 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • Other leak or damaged piece in EVAP system
Try checking the gas cap to see if it is loose. If it is tight then try replacing it. If that doesn't work then there is a hoe somewhere in the evap system. The easiest way to find this kind of leak is with a fogging machine. which means shop which means$$. You can check for yourself. Look for any disconnected hoes,etc. You might be able to hear if there is a vacuum leak when the car is running, it will be a hissing sound. If you can smell gas and the car isn't running, there is a leak somewhere.

Good luck and hope this helped.

Feb 03, 2010 | 2001 Dodge Ram 2500 Truck

1 Answer

2006 Saturn Relay Check Engine Light


PO455 is a large evaporative fuel leak. A bad fuel cap is ONE of the things that COULD be the problem. Fuel system cleaning only lightened your wallet. Reading your post is confusing. Did all this start AFTER the Valvoline Wallet Flushing? If so , they left something loose or disconnected. I would find a qualified repair shop to fix the problem, and if it has anything to do with what Valvoline did, make them pay the bill.

Nov 12, 2009 | 2006 Saturn Relay

2 Answers

Check engine light


you were told your vehicle has small/large evap leak detected? The leak could be coming from any number of components. Fuel tank seal, evap purge valve, check valve. The best way is to find the leak with a smoke machine. It is designed to find leaks in the evap system. There is a port with a green cap in the engine compartment. This is where the hose from the machine attaches to. Turn machine on. Where ever you see smoke, this is where the leak is.

May 20, 2009 | 2002 Chrysler Concorde

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