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Thread: Help me with my Evap leak please?

  1. #1

    Help me with my Evap leak please?

    So, I got a CEL and when I had it scanned it came back as p4055 or something I don't really remember but I do remember he said it meant "gross evap leak". I just tried spraying the lines by the alternator where I had been screwing around with carb cleaner and didn't notice any change in idle is the change big enough I would definitely hear it or do I need to listen really close for a small change or something?

  2. #2
    Member mini_FD's Avatar
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    have fun. i have that same one. I started with the egr valve. It is possible that its stuck open. I can be a bad solenoid. I have a few of those i can give you for free if you pay for shipping. It can be the charcoal canister in the rear under the black plastic held by 12 mm bolts. There is also a sensor and valve under the drivers rear bumper accompanied by rubber hoses. It can also be your gas cap which i highly doubt it is. I replaced mine and nothing. John saw that my intake tube was a little loose. check all the connections.

    My thing is you can get a smoke test by a mechanic or you can buy parts like i did and waste money finding which part it is.

  3. #3
    You know I've never actually Checked out my EGR since I got the car and I know alot of people have had issues with them so I guess thats a good place to start.

  4. #4
    Member mini_FD's Avatar
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    its a beach because you need a small socket 12 mm to get to it drivers side. The transmission can get in the way.

  5. #5
    ugh...

  6. #6
    EGR is also known to cause the idle to surge right?

  7. #7
    Member mini_FD's Avatar
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    its possible. get a smoke test. I am getting one in the next week.

  8. #8
    Member mini_FD's Avatar
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    DTC P0455: EVAP SYSTEM EXCESSIVE LEAK DETECTED
    Condition
    DTC is set when PCM detects high pressure (no vacuum) in fuel
    tank measured immediately after purge control is stopped with Canister
    Drain Cut Valve (CDCV) closed. Possible causes are:
    * Purge solenoid valve malfunction.
    * CDCV malfunction.
    * Loose or missing fuel filler cap.
    * Charcoal canister malfunction.
    * Rollover valve malfunction.
    * Cracked fuel tank or leaking fittings.
    * Clogs or leakage in system hoses.
    * Fuel tank pressure sensor malfunction.
    Diagnosis & Repair Procedure
    1) Ensure FREEZE FRAME data has been recorded. Check service
    bulletins. Go to next step.
    2) Turn ignition off. Turn ignition on. If DTCs P0443 and/or
    P1449 are not present, go to next step. If DTCs P0443 and/or P1449 are
    present, repair those DTCs first.
    3) Inspect fuel filler cap. Ensure filler cap is secure and
    not leaking. If cap is an after-market brand (non-OEM), replace with
    factory brand cap. Go to step 29). If cap is okay, go to next step.
    4) Turn ignition on. Using scan tool, select SIMULATION TEST.
    Simulate PRGV PID at 50 per cent. If valve is heard operating, go to
    next step. If valve does not operate, replace solenoid purge valve. Go
    to step 29).
    5) Using scan tool, select SIMULATION TEST. Simulate CDCV
    PID. If valve is heard operating, go to next step. If valve does not
    operate, replace canister drain cut valve. Go to step 29).
    6) Perform evaporative emission control system inspection.
    Follow scan tool manufacturer's instructions. If system leaks, go to
    next step. If system passes, problem is intermittent (not current).
    7) If evaporative system tester is not available, go to next
    step. Using EVAP tester, check evaporative system. Follow
    manufacturer's instructions. If system passes, go to next step. If
    system fails, diagnose and repair system. After repairs, go to step
    29).
    8) Review steps necessary to perform drive cycle mode No. 4.
    G - TESTS W/CODES - TESTS
    Article Text (p. 38)
    2000 Mazda MX-5 Miata
    For Yorba Linda Miata
    Copyright 1998 Mitchell Repair Information Company, LLC
    Monday, May 12, 2003 01:43PM
    See DRIVE CYCLE PROCEDURE under SELF-DIAGNOSTICS - INTRODUCTION -
    MIATA, MILLENIA, MPV & PROTEGE article. If mode No. 4 is possible, go
    to next step. If mode No. 4 is not possible, go to step 23).
    9) Turn ignition on. Ensure fuel gauge is between 1/4 and 3/4
    full. Using scan tool, monitor PID data for the following:
    * BARO V is 21.3 in.hg or more.
    * ECT is 14-95 F (-10-32.5C).
    * IAT is 14-140F (-10-60C).
    * FTL V is .24-2.0 volts.
    If any signals are not within specification, cool engine as
    necessary and recheck. If all signals are within specification, go to
    next step.
    10) Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS -
    INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Perform drive
    cycle mode No. 4. See DRIVE CYCLE PROCEDURE under SELF-DIAGNOSTICS -
    INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Using scan
    tool, check CDCV and FTP results. If FTP does not change, evaporative
    system monitoring is inoperative. Go to next step. If FTP changes, but
    does not reach .59 in.hg, there is a large leak. Go to step 16). If
    FTP reaches .59 in.hg, but suddenly returns to atmospheric pressure,
    tank will not hold vacuum. Check rollover valve and fuel tank. Repair
    or replace as necessary. After repair, go to step 34).
    11) Turn ignition on. Connect vacuum pump to purge solenoid
    valve. Apply vacuum. Purge solenoid valve should hold vacuum. Using
    scan tool, select SIMULATION TEST and PRGV PID. Set duty cycle to 50
    per cent. Purge solenoid valve should release vacuum. If purge
    solenoid valve operates as specified, go to next step. If purge
    solenoid valve does not operate as specified, replace purge solenoid
    valve. After repair, go to step 29).
    12) Disconnect fuel tank pressure sensor hose. Using scan
    tool, check FTP V PID. If PID is 2.25-2.75 volts, go to next step. If
    PID is not 2.25-2.75 volts, replace FTP sensor. After repair, go to
    step 29).
    13) Connect vacuum pump to fuel tank pressure sensor. Apply
    1.97 in.hg to sensor. Using scan tool, check FTP V PID. If PID is .45-
    .55 volt, go to next step. If PID is not .45-.55 volt, replace FTP
    sensor. After repair, go to step 29).
    14) Remove catch tank in engine compartment. Inspect for
    damage or clogging. If catch tank is okay, go to next step. If catch
    tank is faulty, replace and go to step 29).
    15) Remove charcoal canister. Inspect for damage or clogging.
    If charcoal canister is okay, go to next step. If charcoal canister is
    faulty, replace canister. After repair, go to step 29).
    16) Turn ignition on. Connect vacuum pump to CDCV. Apply
    vacuum. CDCV should not hold vacuum. Using scan tool, select
    SIMULATION TEST and CDCV on. CDCV should hold vacuum. If CDCV operates
    as specified, repair leaking evaporative system hoses. After repair,
    go to step 29). If CDCV does not operate as specified, replace CDCV.
    After repair, go to step 29).
    17) Using scan tool, perform whole system inspection. Follow
    G - TESTS W/CODES - TESTS
    Article Text (p. 39)
    2000 Mazda MX-5 Miata
    For Yorba Linda Miata
    Copyright 1998 Mitchell Repair Information Company, LLC
    Monday, May 12, 2003 01:43PM
    scan tool manufacturer's instructions. System pressure should drop and
    hold for at least 2 minutes. If system does not hold vacuum, leaks are
    present. Go to next step. If system holds vacuum, no leaks are
    present. Go to step 29).
    18) Disconnect fuel tank pressure sensor hose. Using scan
    tool, check FTP V PID. If PID is 2.25-2.75 volts, go to next step. If
    PID is not 2.25-2.75 volts, replace FTP sensor. After repair, go to
    step 29).
    19) Connect vacuum pump to fuel tank pressure sensor. Apply
    1.97 in.hg to sensor. Using scan tool, check FTP V PID. If PID is .45-
    .55 volt, go to next step. If PID is not .45-.55 volt, replace FTP
    sensor. After repair, go to step 29).
    20) Connect scan tool. Perform evaporative emission control
    system inspection check from charcoal canister to fuel tank. Follow
    scan tool manufacturer's instructions. If readings are not as
    specified, go to next step. If readings are as specified, go to step
    27).
    21) Inspect fuel tank and sending unit for leakage or damage.
    If fuel tank and sending unit are okay, go to next step. If problems
    are found, repair as necessary and go to step 29).
    22) Check fuel shut off valve. See SYSTEM & COMPONENT TESTING
    - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If valve is okay, go to
    next step. If valve is faulty, replace fuel tank. Go to step 29).
    23) Inspect rollover valve operation. See SYSTEM & COMPONENT
    TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If rollover
    valve is faulty, replace fuel tank. If rollover valve is okay, repair
    hoses between charcoal canister and fuel tank. After repair, go to
    step 29).
    24) Connect scan tool. Perform evaporative emission control
    system inspection check from charcoal canister to purge solenoid
    valve. Follow scan tool manufacturer's instructions. System pressure
    should drop and hold for at least 2 minutes. If system does not hold
    vacuum, leaks are present. Go to next step. If system holds vacuum, no
    leaks are present. Go to step 29).
    25) Inspect purge solenoid valve. See SYSTEM & COMPONENT
    TESTING - MIATA, MILLENIA, MPV, PROTEGE & 626 article. If purge
    solenoid valve is okay, go to next step. If purge solenoid valve is
    faulty, replace valve and go to step 29).
    26) Remove charcoal canister. Inspect for damage or clogging.
    If charcoal canister is okay, go to next step. If charcoal canister is
    faulty, replace canister. After repair, go to step 29).
    27) Turn ignition on. Connect vacuum pump to Canister Drain
    Cut Valve (CDCV). Apply vacuum to CDCV. Vacuum should be released.
    Using scan tool, select SIMULATION TEST. Turn CDCV from OFF to ON.
    Apply vacuum to CDCV. Vacuum should be held when CDCV is turned on. If
    system operates correctly, repair hoses between CDCV and charcoal
    canister. If system does not operate correctly, replace CDCV and go to
    next step.
    28) Connect all connectors. Turn ignition on. Ensure fuel
    gauge is between 1/4 and 3/4 full. Using scan tool, monitor PID data
    for the following:
    G - TESTS W/CODES - TESTS
    Article Text (p. 40)
    2000 Mazda MX-5 Miata
    For Yorba Linda Miata
    Copyright 1998 Mitchell Repair Information Company, LLC
    Monday, May 12, 2003 01:43PM
    * BARO V is 21.3 in.hg or more.
    * ECT is 14-95 F (-10-32.5C).
    * IAT is 14-140F (-10-60C).
    * FTL V is .24-2.0 volts.
    If any signals are not within specification, go to next
    step. If all signals are within specification, go to step 32).
    29) Perform evaporative emission control system inspection.
    Follow scan tool manufacturer's instructions. If system fails, go to
    next step. If system passes, repair is complete. Go to step 6).
    30) Turn ignition on. Ensure fuel gauge is between 1/4 and
    3/4 full. Using scan tool, monitor PID data for the following:
    * BARO V is 21.3 Hg or higher.
    * ECT is 32-95 F (0-35C).
    * IAT is 50-140F (0-60C).
    If any signals are not within specification, cool engine as
    necessary and recheck. If all signals are within specification, go to
    next step.
    31) Erase DTC. See CLEARING CODES in appropriate SELFDIAGNOSTICS
    - INTRODUCTION article. Review steps necessary to perform
    drive cycle mode No. 4. See DRIVE CYCLE PROCEDURE under SELFDIAGNOSTICS
    - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article.
    If mode No. 4 is not possible, go to next step. If mode No. 4 is
    possible, go to step 33).
    32) Perform evaporative emission control system inspection.
    Follow scan tool manufacturer's instructions. If system fails, replace
    PCM. After repair, go to step 6). If system passes, repair is
    complete. Go to step 6).
    33) Perform drive cycle mode No. 4. See DRIVE CYCLE PROCEDURE
    under SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE
    article. Using scan tool, check system readiness test results. If
    evaporative system has been monitored, go to next step. If evaporative
    system has not been monitored, go to step 30).
    34) Using scan tool, verify TEST #10:22:00 in DIAGNOSTIC
    MONITORING TEST RESULTS. If test does not exceed MAX value, go to next
    step. If test exceeds MAX value, replace PCM. After repair, go to next
    step.
    35) Using scan tool, verify PENDING TROUBLE CODE DTC and
    DIAGNOSTIC MONITORING TEST RESULTS. If any DTCs are present, go to
    applicable test and repair as needed. If no DTCs are present, testing

  9. #9
    Wow, quite the list of stuff to do Ill have to try and get my hands on a scan tool soon. Thanks for posting that here.

  10. #10
    Member mini_FD's Avatar
    Join Date
    Aug 2009
    Location
    Melbourne Beach, FL 32951
    i posted it on mine as well to read the possibilities.

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