Question about 1984 Chevrolet Monte Carlo

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Bad Vacuum Leak

How can you tell if the vacuum lines to the emission control is not working properly?

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  • yadayada
    yadayada May 11, 2010

    There is more than one vacuum line, what paticular system are you having trouble with?? Describe it please

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Sometimes the engine will rev high and other times the computer will look for the idle and will go up and down in the rpms 

Posted on Sep 11, 2008

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I would like to know what the code PO455 on a 2007 Mitsubishi Endeavor means.


Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
help.jpg What does this mean? Tech notes
The P0455 it's a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.
help.jpg What does this mean? When is the code detected?
Evaporative Emission System (EVAP) control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0455 Mitsubishi Description
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Read more: http://engine-codes.com/p0455_mitsubishi.html#ixzz3NlVyARyX

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Dec 30, 2014 | Cars & Trucks

1 Answer

What is a vacuum line in a Nissan murano?


Vacuum lines are on the engine for several different reasons. Power Brake boosters are connected to the engine by a vacuum hose, other vacuum lines go to the emission system and other engine controls.

You can spray those hoses/line with regular carb cleaner with the engine running, and if there is a leak, you will notice the engine changes RPM's when you spray near the leak. Only do this in an open area and in short burst. The "cleaner" is FLAMMBLE, so test one area and then let it air out before moving to the next area.

Reading the OBDII engine codes may help you pinpoint the leak by saying it's small, large, or, from a specific component.

The gas cap not being tightened properly, or with debris on the seal can trigger an engine light also, check that as well.

dc870b43-b73d-4ba5-9c80-572d5b231a88.jpg

Sep 17, 2014 | 2005 Nissan Murano

2 Answers

How to repair engine code po442 2009 mazda 5?


Check the purge solenoid under the hood common problem in mazda 5 6 cx7.

Jul 11, 2014 | Mazda Cars & Trucks

1 Answer

Vacuum line leak


If one vacuum line is cracked, it is time to replace ALL of the vacuum lines. They run the power brakes, control all of the air conditioning and heater controls and on some cars they are part of the emission control system.

Jan 20, 2014 | 2006 Cadillac STS

1 Answer

P0442-Evaporator emission control system leak(small leak) P0455-Evaporator emission control system leak(gross leak) Have replaced gas cap with Dodge cap from dealer.


The purge solenoid is by the engine and is connected to the vacuum system. Check the vacuum lines going to this and the lines that may be connected to the vacuum port it comes from. Check for seals on the solenoid if it is directly in the intake manifold. Other things to check are the lines (plastic) that go to the charcoal canister and fuel tank. If the light has been on for a while I would start with the pugre solenoid. If you have a vacuum leak there it would go from small to gross.
Small leaks are checked by the ECM constantly, gross leaks are some that has broke/cracked.

Jun 28, 2011 | Dodge Grand Caravan Cars & Trucks

2 Answers

My 1995 subaru legacy lsi cuts out when I rev the engine around 1 rpm. Plus the check engine light is on. I took it to the dealership and they couldn't fix it, but they got a code from the check engine...


code p 0441 refers to evaporative emission (EVAP) system --incorrect flow detected ==== causes --- hose connection/s--- intake leak---EVAP canister purge valve replace the purge valve

May 21, 2017 | 1995 Subaru Legacy

3 Answers

I have a p0442 code on my 2001 dodge Dakota how do I fix it?


This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. 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.

Mar 22, 2011 | 2001 Dodge Dakota

1 Answer

Po 442 po 455


P0442 - Evaporative Emissions System Leak Detected (Small Leak)

P0455 - Evaporative Emissions System Leak Detected (Gross Leak)

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition. The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

Causes:
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve
- Leak is in line between intake manifold

Solutions:
- Re-tighten or replace fuel tank filler cap
- Replace damaged or leaking EVAP canister
- Replace damaged or leaking lines.

Feb 10, 2011 | Chrysler Town and Country Cars & Trucks

1 Answer

Engine coad po442 how do i fix it


PO442 is the data trouble code for (evaporative emission control system leak detected "small leak") it means that the OBD-II system has detected a small vacuum leak in the evaporative control system.

You will need to find the vacuum leak in the evaporative control system, check for cracked or broken vacuum lines and hoses, especially the vacuum hoses and lines around the evaporative (Evap) canister and the (Evap) solenoid. Also check the gas cap seal for damage.

Vacuum hoses and lines should be checked very well for any cracks or breaks, because they usually hide under the vacuum line or hose.

May 02, 2010 | 2001 Dodge Durango

1 Answer

I have vacuum leaks .I have problems connecting the vacuum lines


you need to find your decal on the underside of hood or on the shield above the radiator cooling fan.

1997 PCED OBDII-A SECTION 1A: Description and Operation
Vehicle Emission Control Information Decal Each vehicle has a decal (Figures 1 and 2) containing emission control information that applies specifically to the vehicle and engine. The specifications on the decal are critical to servicing emissions systems.

typical decal
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Figure 1: Typical Vehicle Emission Control Information Decal for 49 States Vehicles




Figure 2: Typical Vehicle Emission Control Information Decal for California Vehicles




Figure 3: Typical Vehicle Emission Control Information Decal for Canadian Vehicles. In addition to the tune-up specifications and procedures, the emission decal shows a color-coded (shown in black and white) schematic of the engine vacuum system. The color coding on the schematic represents the actual color coding on the vacuum hoses. However, there will be instances when a hose color does not match the color on the decal.
Decal Location Typical location of the decal will be on the underside of the hood or the radiator support sight shield.

Apr 04, 2009 | 1997 Ford Windstar

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