Question about 2004 Ford Freestar

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Mechanic says that system shows a vacuum leak but no visable hoses loose, what else could be causing this?

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Most annoying,you cant "see"an air leak.use petroleum jelly,one hose at a time,until you find the "leak".. patience IS mandatory.....

Posted on Sep 28, 2010


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I trouble with P0106, P0442, P0455

code p 0106 refers to manifold absolute pressure(MAP) sensor / barometric pressure (BARO) sensor---range /performance problem===causes --intake exhaust leak---wiring---MAP sensor---BARO sensor
code p 442 refers to evaporative emission(EVAP) system--small leak detected===causes --hose connections ---intake leak---EVAP cannister purge valve
it also refers to EVAP system ---large leak detected ---cap loose/ off ===causes --mechanical fault , hose connection EVAP pressure sensor
code p 0455 refers to EVAP system --large leak detected ===causes same as for p 0442 causes

Jul 07, 2016 | Plymouth Grand Voyager Cars & Trucks

1 Answer

My nissan murano 2004 won't stay running service engine soon light is on code reads large vacuum leak idk where or if that's what it is

The large vacuum leak will be what is causing your engine to die. Some tube, hose etc has come loose in the intake system and is allowing too muck air into the intake manifold, so much that the air flow sensor cannot compensate for it. Open the bonnet and look under the hood for any obviously loose hoses etc by tracing the air from the intake to the filter to the maf to the intake
Have you recently had a large backfire? This can blow apart an intake if there are any plastic bits in it's construction, and that will certainly cause an enormous leak. If nothing is obvious you will need the help of a mechanic....perhaps to scan the computer for the fault codes first?..

Apr 15, 2015 | Nissan Cars & Trucks

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code p0442 refers to evaporative emission (EVAP) system--small leak detected====causes hose connection/s---intake leak--EVAP canister---EVAP canister purge valve
it also refers to evaporative emission system --large leak detected (fuel cap loose/ off)===causes---mechanical fault--hose connection/s--EVAP pressure sensor.

Jun 14, 2014 | 2003 Toyota ECHO

1 Answer

04 grand cherokee, have replace all 4 oxigen sensors, replace gas cap and now is showing a 0442 code.

code p0442 refers to evaporative emission (EVAP) system--small leak detected.===causes---hose connections --intake leak---EVAP canister--EVAP purge valve
It also refers to large leak detected (fuel cap loose /off)===causes --mechanical fault---hose connections--EVAP pressure sensor.
No--- you do not need to drive it more Just need to fix the faulty unit.

Feb 21, 2014 | Cars & Trucks

1 Answer

Got Code P0440 Mechanic Said it is its a Vacuum Pump (assummining its the same thing as a leak detection pump) if so where is it located and how difficult is it to replace

code P0440 refers to evaporitive emissions (EVAP) system problem.Most likely problem is a vacuum hose leak or an intake system leak.Check all the vac. pipes for cracks or loose fitting.

Aug 06, 2013 | 2004 Jeep Liberty

1 Answer

2004 Mitsubishi EndeavorTroubleshooting Code P0442

code p 0442 refers to evaporative emission(EVAP) system---small leak detected ===causes --hose connections--intake leak---EVAP canister---EVAP canister purge valve
There is another section --large leak detected in the EVAP system===causes --mechanical fault---fuel cap loose / off--hose connections ---EVAP pressure sensor

Jun 20, 2012 | 2004 Mitsubishi Endeavor

1 Answer

Evaporator system, large leak

That can be caused by a large vacuum leak usually at the vacuum lines to the EVAP canister, or a loose fuel cap could have caused that DTC (Data Trouble Code).

Check the vacuum hoses very carefully for any cracks or broken lines especially the vacuum hoses to the EVAP canister.

Jun 12, 2010 | 2004 GMC Envoy

2 Answers

Anti freeze leak

it could be anything, hoses are common, have the system pressure tested to determine the cause of the leak, a dealer can do this.

Apr 29, 2009 | 1992 Saturn SL1

1 Answer

Code P0171

Here are the possible causes for a PO171:

  • Base engine mechanical problem causing a lean A/F condition
  • Check for air leaks in the Air Induction system (e.g., in the intake manifold)
  • Check for air leaks in the exhaust manifold and in the exhaust pipes
  • Check for air leaks in the PCV system and in its related hoses and/or valve
  • Fuel control sensor is out of calibration (e.g., ECT, IAT or MAP)
  • Fuel delivery component fault (clogged filter, low fuel pressure)
  • HO2S has failed (it may be contaminated with fuel, silicone or water)
  • Vacuum hose is disconnected, broken, leaking or loose
Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Mar 20, 2009 | 1998 Honda Accord

2 Answers


Some of these systems are controlled by vacuum. May want to start looking for a vacuum leak somewhere. Some mechanics spray starting fluid near the vacuum lines to test for leaks.

Jan 02, 2009 | 2000 Jeep Grand Cherokee

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