Examples
of vacuum leaks include: leaking intake manifold gasket, broken PCV valve or PCV hose, disconnected vacuum line, cracked vacuum line, ripped intake snorkel - faulty fuel injector - damaged engine computer (PCM)- low fuel pressure - leaking head gasket - low compression in the affected cylinder - valves that are out of adjustment - bad mass airflow sensor (random misfire).
Speaking
of vacuum leaks what about the brake booster?
In the course of helping my friend sort out a lean condition with his Mercedes GLK280 we have to pinpoint the source
of a vacuum leak in the intake plumbing.
Surely, there must be alternative means to determine the exact source
of a vacuum leak?
Other than an occasional rough start - starts fine but stumbles and hunts for a few seconds - I don't see any indication
of a vacuum leak.
Nor could I find any indication
of a vacuum leak - no whistling and all the hoses seem intact.
Regarding the tangent, yes, an ill - fitting dipstick can be the cause
of a vacuum leak.
Depending on the hissing sound you are referring to, this may suggest you have a bit
of a vacuum leak, which may be preventing the motor from starting.
Some reports from the field have shown that one source
of a vacuum leak is the O - ring seal between the brake master cylinder and brake booster.
Not exact matches
Documents
leaked by Snowden showed that the National Security Agency went much further by
vacuuming up huge troves
of email and other digital data.
In - House Laboratory Testing Facility including accelerated product shelf life analysis and
vacuum leak testing
of container / closure compatibility, to reduce your risk.
One option
of subjecting MAP packing to a
leak test is based on the generation
of a
vacuum and the implementation
of carbon dioxide as a testing gas.
Submerges your package, applies a
vacuum to improve sensitivity, allowing location
of leaks via streams
of bubbles.
After the sort
of prolonged delivery that requires the use
of forceps or a
vacuum, you may find it difficult to go to the bathroom, or you may experience urine
leaks because
of temporary changes in your pelvic and perineal nerves and muscles.
But maintaining this partial
vacuum in an industrial plant is difficult, and up to 25 per cent
of the magnesium vapour may be reoxidised by air that
leaks into the system.
Also, if there is even the slightest
leak in the
vacuum bag (after its come out
of the pressure canner), there is a risk
of botulism.
You mention two issues: fast idle hard brakes Both
of these point to a
vacuum leak.
If you don't do car repairs yourself, take it to a garage and mention the fault code (P0506) and your suspicion
of the cause, a potential
vacuum leak.
Some people have stated listening for a
vacuum leak noise and if located within a vicinity disconnect and add a new line
of the same diameter and get a cigar and blow smoke from the cigar in the line.
There are more advanced tests which can be performed such as
Vacuum Tests,
Leak - Down Tests, Dry and Wet Compression tests, which will give a more specific picture
of the engines health but these might be out
of the scope
of the query.
Vacuum leaks are the ground loops
of the automotive world.
I googled for P0506, and the first page I found also mentions
vacuum leak as the first possible cause
of failure: https://www.obd-codes.com/p0506... although to be fair, there are some other possible causes as well.
did not have a problem with the grinding
of metal but the stuttering sound i had a
vacuum leak on the drivers side on the bottom side
of the pvc hose couldn't see it but felt it with my hand also with misfiring i changed the coil pack cleared it up!!
Since the intake manifold pressure is directly measured to calculate the intake air volume and decide the amount
of fuel to inject, a
vacuum leak theoretically can not contribute to a lean condition like this.
The brake booster runs off engine
vacuum, so a
vacuum leak can also affect the amount
of force you need to exert on the brakes to stop.
There are many other problems I would suspect like
vacuum leaks, fuel supply issues, and ignition issues all
of which would be much cheaper to fix.
Have the system inspected and serviced (which means having the refrigerant evacuated, system
leak tested,
vacuumed if no
leaks found, then correct gas quantity inserted along with all the oil that the recovery machine pulled out
of the lines).
Makes a lot
of sense, I heard a lean condition can cause it to heat up more too, and the bike was running hotter than usual at idle so this would make sense, gonna go ahead and try to fix the airbox fittings or buy a new one, and start going through the trouble shooting to see if I can find any
vacuum leaks, ill keep you updated on my findings!
My bad, forgot to update in these comments lol But I got everything sorted out fine, followed some
of the trouble shooting tips from your answer, and I cleaned the carbs one last time to be sure, also cut some mounts up on the air box so I could push it more flush up against the carbs without them stopping it, and made sure to screw it down real tight, Bike works amazingly now, there's still a slight
vacuum leak from 1 - 2 fittings but at least now I know exactly what it is, just got ta decide if im gonna fix it or buy a new airbox, thanks for your help man!
A
vacuum leak can trigger a «check engine» light because the fuel system is running too «lean,» meaning it has a greater mix
of air than is ideal.
Remember you'll need new gaskets to do this or your new engine will have plenty
of issues (like
vacuum leaks in the intake which will allow unmetered air into the intake system, and exhaust
leaks which will allow air into the exhaust track allowing for really crappy gas mileage.).
It is not unusual for the
vacuum actuated portion
of the petcock to fail and the owner to clip and plug the
vacuum line going to the intake boot to eliminate the associated
vacuum leak.
Are you talking about
vacuum pipes that are used to move the flaps that control the flow
of hot / cold air into the cabin, or are you talking about using a
vacuum pump to test if your A / C refrigerant pipes are
leaking?
An easy way to check for the
leak is to pull a
vacuum line off the intake and suck a small amount (1 - 2oz)
of transmission fluid into the intake via that
vacuum line.
Having just replaced the PVC valve on a 2013 TSI and still getting a P2177 code I started looking for
vacuum leaks and would like to know if it is normal for a good PCV valve to expel a small amount
of air through the vent hole?
If you're confident that there are no
vacuum leaks, MAF's can give lower - than - expected measurements over time due to fouling
of the sensor.
That won't tell you were the
leak is (unless it's huge and you can hear the air getting back into the system), but it will tell you if you have one, and it will also give you an idea
of the size
of the
leak (by how fast the
vacuum is lost).
Could mistakes in any
of this introduce an internal
vacuum leak?
You can test for the presence
of a
leak without expending any R134a by sucking the system down to a
vacuum.
If it's neither
of these things then it could conceivably be a
vacuum leak caused by a split pipe or perished rubber seal somewhere on the inlet side
of the fuel system.
If the
vacuum is
leaking, it will mimic the symptoms
of a bad IAC valve.
It's also good for finding exhaust
leaks — an exhaust
leak upstream
of the O2 sensor can pull in extra oxygen and mimic a
vacuum leak, even if it's not large enough to make any noise.
When emission controls started to proliferate in the late»60s, some cars had literally dozens
of vacuum lines and connections, and any one
of them represented a potential
vacuum leak.
If the vehicle stalls upon touching the brake pedal, that could be due to a
vacuum leak in the brake booster system but only
of course if the vehicle has power brakes.
If everything is fine then I do a smoke test
of the intake system to check for
vacuum leaks.
Other possible causes
of a high idle include
vacuum leaks, a malfunctioning throttle and, rarely, a PCM / ECM malfunction.
In most cases, the issue
of «self acceleration» is caused by one
of the following; a damaged throttle body,
vacuum leak, electronic throttle control, or idle control valve issue.
A
vacuum leak can cause an engine to idle high due to the excessive amount
of air flow into the fuel injection system.
Extensive amounts
of time are used to detect
vacuum leaks without testing for proper operation
of the EVAP
leak detection pump.
There are many causes
of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), malfunctioning idle air control (IAC) valve,
vacuum and EGR
leaks, inadequate fuel delivery or pressure (clogged fuel filter, dirty fuel injectors), and contaminated or old gasoline.