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  #16  
Old 07-10-2010, 12:07 PM
unclegoose unclegoose is offline
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Default Re: 2003 Ranger vacuum leak

Turns out my code is a 442.

I have replaced my gas cap 3 times...on to the next option.
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  #17  
Old 07-10-2010, 12:12 PM
Jp7 Jp7 is offline
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Default Re: 2003 Ranger vacuum leak

Quote:
Originally Posted by unclegoose View Post
Turns out my code is a 442.

I have replaced my gas cap 3 times...on to the next option.
442 sounds like an evap code
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  #18  
Old 07-10-2010, 05:23 PM
FireRanger FireRanger is offline
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Default Re: 2003 Ranger vacuum leak

P0442 is a vacuum leak in the evap system. Most often is the fuel cap, but you tried that already. Could be a crack in one of the hoses or the fuel filler, or the evap canister solenoid is fucked up and not closing all the way. It's trivial BS system so don't lose sleep over it.
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  #19  
Old 07-10-2010, 06:01 PM
Jp7 Jp7 is offline
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Default Re: 2003 Ranger vacuum leak

Quote:
Originally Posted by FireRanger View Post
P0442 is a vacuum leak in the evap system. Most often is the fuel cap, but you tried that already. Could be a crack in one of the hoses or the fuel filler, or the evap canister solenoid is fucked up and not closing all the way. It's trivial BS system so don't lose sleep over it.
Its still a pita though. Need to fix (at least where I live) to pass emissions.
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  #20  
Old 07-10-2010, 09:04 PM
unclegoose unclegoose is offline
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Default Re: 2003 Ranger vacuum leak

That is my problem....gotta get this thing to pass emissions, and I need to do it soon.

Gonna go over it good in the morning and see if I can't figure out where this "small" leak is. Such crap.
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  #21  
Old 07-10-2010, 10:00 PM
FireRanger FireRanger is offline
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Default Re: 2003 Ranger vacuum leak

If you reset the CEL with a scan tool or by resetting the battery, how long does it take for the light to come back on?
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  #22  
Old 07-10-2010, 10:06 PM
Jp7 Jp7 is offline
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Default Re: 2003 Ranger vacuum leak

Quote:
Originally Posted by FireRanger View Post
If you reset the CEL with a scan tool or by resetting the battery, how long does it take for the light to come back on?
it should run through the p1000 diagnostics and trigger a pending code before eliminating the 1000.


Evaporative Emission (EVAP) Leak Check Monitor



The Evaporative Emission (EVAP) Leak Check Monitor is an on-board strategy designed to detect a leak from a hole (opening) equal to or greater than 1.016 mm (0.040 inch) in the Enhanced EVAP system. The proper function of the individual components of the Enhanced EVAP system as well as its ability to flow fuel vapor to the engine is also examined. The EVAP Leak Check Monitor relies on the individual components of the Enhanced EVAP system to apply vacuum to the fuel tank and then seal the entire Enhanced EVAP system from atmosphere. The fuel tank pressure is then monitored to determine the total vacuum lost (bleed-up) for a calibrated period of time. Inputs from the engine coolant temperature (ECT) or cylinder head temperature (CHT) sensor, intake air temperature (IAT) sensor, mass air flow (MAF) sensor, vehicle speed, fuel level input (FLI) and fuel tank pressure (FTP) sensor are required to enable the EVAP Leak Check Monitor.

Note: During the EVAP Leak Check Monitor Repair Verification Drive Cycle clearing the continuous diagnostic trouble codes (DTCs) and resetting the emission monitors information in the powertrain control module (PCM) will bypass the minimum soak time required to complete the monitor. The EVAP Leak Check Monitor will not run if the key is turned off after clearing the continuous diagnostic trouble codes (DTCs) and resetting the emission monitors information in the powertrain control module (PCM). The EVAP Leak Check Monitor will not run if a MAF sensor failure is indicated. The EVAP Leak Check Monitor will not initiate until the Heated Oxygen Sensor (HO2S) Monitor has completed.

The EVAP Leak Check Monitor is executed by the individual components of the Enhanced EVAP system as follows:

The function of the EVAP canister purge valve is to create a vacuum on the fuel tank. A minimum duty cycle on the EVAP canister purge valve (75%) must be met before the EVAP Leak Check Monitor can begin.
The canister vent (CV) solenoid will close (100% duty cycle) with the EVAP canister purge valve at its minimum duty cycle to seal the Enhanced EVAP system from atmosphere and obtain a target vacuum on the fuel tank.
The fuel tank pressure (FTP) sensor will be used by the EVAP Leak Check Monitor to determine if the target vacuum on the fuel tank is being reached to perform the leak check. Some vehicle applications with the EVAP Leak Check Monitor use a remote in-line FTP sensor. Once the target vacuum on the fuel tank is achieved, the change in fuel tank vacuum for a calibrated period of time will determine if a leak exists.
If the initial target vacuum cannot be reached, DTC P0455 (gross leak detected) will be set. The EVAP Leak Check Monitor will abort and not continue with the leak check portion of the test.

For some vehicle applications: If the initial target vacuum cannot be reached after a refueling event and the purge vapor flow is excessive, DTC P0457 (fuel cap off) is set. If the initial target vacuum cannot be reached and the purge flow is too small, DTC P1443 (no purge flow condition) is set.

If the initial target vacuum is exceeded, a system flow fault exists and DTC P1450 (unable to bleed-up fuel tank vacuum) is set. The EVAP Leak Check Monitor will abort and not continue with the leak check portion of the test.

If the target vacuum is obtained on the fuel tank, the change in the fuel tank vacuum (bleed-up) will be calculated for a calibrated period of time. The calculated change in fuel tank vacuum will be compared to a calibrated threshold for a leak from a hole (opening) of 1.016 mm (0.040 inch) in the Enhanced EVAP system. If the calculated bleed-up is less than the calibrated threshold, the Enhanced EVAP system passes. If the calibrated bleed-up exceeds the calibrated threshold, the test will abort and rerun the test up to three times.

If the bleed-up threshold is still being exceeded after three tests, a vapor generation check must be performed before DTC P0442 (small leak detected) will be set. This is accomplished by returning the Enhanced EVAP system to atmospheric pressure by closing the EVAP canister purge valve and opening the CV solenoid. Once the FTP sensor observes the fuel tank is at atmospheric pressure, the CV solenoid closes and seals the Enhanced EVAP system.

The fuel tank pressure build-up for a calibrated period of time will be compared to a calibrated threshold for pressure build-up due to vapor generation.

If the fuel tank pressure build-up exceeds the threshold, the leak test results are invalid due to vapor generation. The EVAP Leak Check Monitor will attempt to retest again.

If the fuel tank pressure build-up does not exceed the threshold, the leak test results are valid and DTC P0442 will be set.
If the 1.016 mm (0.40 inch) test passes, the test time is extended to allow the 0.508 mm (0.020 inch) test to run.

The calculated change in fuel vacuum over the extended time is compared to a calibrated threshold for a leak from a 0.508 mm (0.020 inch) hole (opening).

If the calculated bleed-up exceeds the calibrated threshold, vapor generation is run. If vapor generation passes (no vapor generation), an internal flag is set in the PCM to run a 0.508 mm (0.020 inch) test at idle (vehicle stopped).

On the next start following a long engine off period, the Enhanced EVAP system will be sealed and evacuated for the first 10 minutes of operation.

If the appropriate conditions are met, a 0.508 mm (0.020 inch) leak check is conducted at idle.

If the test at idles fails, a DTC P0456 will be set. There is no vapor generation test with the idle test.
Note: If the vapor generation is high on some vehicle Enhanced EVAP Systems, where the monitor does not pass, the result is treated as a no test. Thereby, the test is complete for the day.

The malfunction indicator lamp (MIL) is activated for DTCs P0442, P0455, P0456, P0457, P1443 and P1450 (or P446) after two occurrences of the same fault. The MIL can also be activated for any Enhanced EVAP system component DTCs in the same manner. The Enhanced EVAP system component DTCs P0443, P0452, P0453 and P1451 are tested as part of the Comprehensive Component Monitor (CCM).


P0442 - EVAP Control System Leak Detected (Small Leak) The PCM monitors the complete EVAP control system for presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.


Possible Causes

After-market EVAP hardware (such as fuel filler cap) non-conforming to required specifications
Small holes or cuts in fuel vapor hoses/tubes
Canister vent solenoid stays partially open on closed command
Damaged, cross-threaded or loosely installed fuel filler cap
Loose fuel vapor hose/tube connections to EVAP system components
EVAP system component seals leaking (EVAP canister purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve assembly)

Last edited by Jp7; 07-10-2010 at 10:08 PM.
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  #23  
Old 07-11-2010, 04:42 PM
unclegoose unclegoose is offline
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Default Re: 2003 Ranger vacuum leak

Wow, thanks for all the info...

Didn't mean to hijack this thread by they way.

Found a disconected tube coming off the rear axle. could that have anything to do with it?
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  #24  
Old 07-11-2010, 05:30 PM
FireRanger FireRanger is offline
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Default Re: 2003 Ranger vacuum leak

No, that would be the breather tube for the rear axle. No connection.
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  #25  
Old 08-14-2010, 03:28 AM
Jamie Jamie is offline
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Default Re: 2003 Ranger vacuum leak

Am having the same problem on my 99 4.0 where is the pcv at on that one
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  #26  
Old 08-15-2010, 03:58 AM
Jimbo Jimbo is offline
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Default Re: 2003 Ranger vacuum leak

The PCV line goes from the PCV on the back of the drivers side valve cover to just under the throttle body. The rubber 90 degree elbow I had problems with is the one just inder the throttle body. The crack was on top of the hose in the middle.
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  #27  
Old 08-15-2010, 09:02 PM
Jamie Jamie is offline
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Default Re: 2003 Ranger vacuum leak

Thanks red
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  #28  
Old 10-03-2013, 06:02 PM
Leslie81 Leslie81 is offline
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Default Re: 2003 Ranger vacuum leak

Hello , I am having the same PCV elbow issue and refuse to pay the $65 the Ford dealer wants to replace the entire thing when all I need is the elbow. I have had it rigged with black electrical tape and clamps for the last 2 months but it is not working effectively because I keep having to redo it to keep the check engine light off. You say to but heater hose, but my question is how does that work when one end of the elbow is twice the size of the other end?
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  #29  
Old 10-03-2013, 06:31 PM
Logan03CO Logan03CO is offline
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Quote:
Originally Posted by Leslie81 View Post
You say to but heater hose, but my question is how does that work when one end of the elbow is twice the size of the other end?
Without you creating a signature I'm not sure what year & engine you have - but since you’re posting in a thread about a 2003 4.0 SOHC, I'll assume it applies to you...

I also have a 2003 & I don't recall it being dramatically different diameters between the two ends. I thought it was that way for all 4.0 SOHC's on the 2001+ models.

That said, if yours is truly that big of a difference, I would assume you can find a simple 'universal type' replacement PCV elbow that will suit your needs from someone like Dorman (Keyword Search = PCV Elbow). They have all sorts of 'reducing elbows' that would work fine when paired with a couple hose clamps.

Here are some random pictures from Google that show the typical PCV elbow on the 4.0 Ranger:

EDIT: After a second look - These seem to be showing the elbow towards the front of the engine (other end of the PCV hose) - But my main point should still be valid. lol



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Last edited by Logan03CO; 10-03-2013 at 06:40 PM.
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