Question about Cars & Trucks

1 Answer

High steady idle caused by vacuum leak? - Cars & Trucks

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 1,045 Answers

You can do a smoke test and see where the smoke is being drawn into the sys. Hope this helps.

Posted on Apr 27, 2017

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

1999 Mercury Villager Causes Of High Idle?


usually it is a vacuum leak which is letting more air into the engine. With engine running, use a spray water bottle and mist around all vacuum lines, the power brake booster and engine seams. Then try any vacuum line to the transmission. Could also be a burst vacuum shift diaphram if so equipped.

Aug 31, 2015 | 1999 Mercury Villager

1 Answer

High idle


Vacuum leaks or fuel pressure, or ECM.
When you press the accelerator you allow more air into the engine. The same extra air can get into the engine through leaks in the Vacuum system. Sometimes using a spray bottle of water and spraying the seams of the Intake manifold on a running engine can reveal the opening. Also spray any Vacuum lines and the Brake booster. A leak will change the RPM.
A high fuel pressure can cause an increase in RPM.
ECM- has a lot to due with timing and fuel demands.
Binding Linkage. Disconnect the throttle linkage and see if the RPM drops. If it does not, shut off the engine and work the Air horn Butterfly and check for smooth operation. It is possible that a mounting screw on the Butterfly shaft has slipped and the flap is binding or dirty.

May 21, 2013 | 2001 Mercury Sable

1 Answer

Idle


Sounds like a vacuum leak. This will cause the idle speed to be high. Additionally most cruise controls are operated by vacuum pressure. Look around the intake manifold for disconnected rubber hoses. May have popped off from dry rot or stretched out etc. Find the vacuum leak and fix it, both problems should go away.

May 04, 2013 | 1994 Mercedes-Benz C-Class

1 Answer

1994 Toyota 4runner runs intermittently, no vacuum sounds as if there is a leak, all fluids topped off, truck cranks over and does start but will not stay running. Idle changes drastically until hot. Once...


You should check you MAF sensor. clean your throttle body and change your spark plugs. shouldn't be anything if you say there is NO vacuum leak.would recommend searching your PCV valve for a vacuum leak

Feb 07, 2013 | Cars & Trucks

1 Answer

Ford explorer idling too high


High idle is in almost all caused caused by a vacuum leak on the engine, get a can of carburetor spray and spray around the top of the engine, if you hit a leak it will make the engine sound different and there will be a sucking noise. Also check for hoses that are leaking that connect to the intake vacuum source. If no leaks are found you will need the system scanned for faults in the idle speed control system.

Sep 10, 2012 | 1993 Ford Explorer Limited

2 Answers

The idle is sticking on park


High idle speed is usually caused by a sticking idle air control valve or a vac leak. The computer controls idle speed by how much air is allowed into the intake manifold.
is the check engine light on ?

Aug 26, 2012 | 1997 Chevrolet Tahoe

1 Answer

Cods P1747,P0750,P0755,P0743


OK, so is it still setting the codes? Or has that gone away with the transmission harness repair? The idle is controlled by the Idle Air Control (IAC) solenoid. Ford has had a lot of trouble with these. However, the symptom is usually low idle speeds that cause the engine to stall. I think I would be looking for vacuum leaks. Ford 4.6L engines are notorious for the PCV hoses leaking at the elbow where it connects to the back of the throttle body.

Mar 12, 2012 | 1995 Ford Thunderbird

3 Answers

High idle with new iac valve no difference 1509 trouble code


With the engine running take a can of aerosol spray WD-40 and spray it at the vacuum lines, the throttlebody and the intake manifold gaskets. At one point you should here the engine speed decrease. If you do, concentrate the spray around the area until you are able to pinpoint the vacuum leak. If you don't find a leak, try clamping the line to the brake booster with your fingers and see if that makes a difference in the idle speed, if so the diaphram is at fault and needs replacement. Thanks, Dana

Sep 21, 2009 | 2000 GMC Safari

2 Answers

Flatlining at 3000 RPM


maybe the cam timing is off. If the engine was torn down and reassembled wrong, that would do it. Connect a vacuum gauge to the intake manifold and see what you get for vacuum readings.
It should be about 17 inches at idle. And, it should be steady.

d3b9af0.gif
  1. NORMAL READING: Needle between 51-74 kPa (15-22 in-Hg) and holding steady.
  1. NORMAL READING DURING RAPID ACCELERATION AND DECELERATION: When engine is rapidly accelerated (dotted needle), needle will drop to a low (not to zero) reading. When throttle is suddenly released, the needle will snap back up to a higher than normal figure.
  1. NORMAL FOR HIGH-LIFT CAMSHAFT WITH LARGE OVERLAP: Needle will register as low as 51 kPa (15 in-Hg) but will be relatively steady. Some oscillation is normal.
  1. WORN RINGS OR DILUTED OIL: When engine is accelerated (dotted needle), needle drops to 0 kPa (0 in-Hg). Upon deceleration, needle runs slightly above 74 kPa (22 in-Hg).
  1. STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally flicks (sharp, fast movement) down and back about 13 kPa (4 in-Hg), one or more valves may be sticking.
  1. BURNED OR WARPED VALVES: A regular, evenly-spaced, downscale flicking of the needle indicates one or more burned or warped valves. Insufficient hydraulic valve tappet clearance will also cause this reaction.
  1. POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are not seating.
  1. WORN VALVE GUIDES: When the needle oscillates (swings back and forth) over about a 13 kPa (4 in-Hg) range at idle speed the valve guides could be worn. As engine speed increases, needle will become steady if guides are responsible.
  1. WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine rpm is increased, weak valve springs (6513) are indicated. The reading at idle could be relatively steady.
  1. LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.
  1. IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low reading.
  1. INSUFFICIENT SPARK PLUG GAP: When spark plugs (12405) are gapped too close, a regular, small pulsation of the needle can occur.
  1. INTAKE LEAK: A low, steady reading which can be caused by an intake manifold or throttle body gasket leak.
  1. BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket (6051) or warped cylinder head-to-cylinder block surface.
  1. RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be normal but as the engine rpm is increased, the back pressure caused by a clogged muffler, kinked tailpipe or other concerns, will cause the needle to slowly drop to 0 kPa (0 in-Hg). The needle then may slowly rise. Excessive exhaust clogging will cause the needle to drop to a low point even if the engine is only idling.
    When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the system will upset the fuel mixture and cause concerns such as rough idle, missing on acceleration or burned valves. If the leak exists in an accessory unit such as the power brake booster (2005), the unit will not function correctly. ALWAYS FIX VACUUM LEAKS.

May 25, 2009 | 1994 Ford Mustang

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

17 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...