Question about 2001 Daewoo Lanos

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Engine idles at 1500rpm & check engine lamp comes on after 5 sec

I cleaned the throttle area and checked for false air through inlet manifold. All good.

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Try removing the Idle rev valve and cleaning it with carburettor cleaner.

Posted on Nov 23, 2008

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I get a whistling noise i think is coming from throttle body


Your whistling is quite possibly a vacuumn hose leak on the passenger's side, top of the engine. Look closely at the hose connections coming from the PCV. Small holes can develop in these vacuum line connections, and you will experience a rough idle, as well as the "whistling" noises.

Jul 06, 2014 | 1999 Ford Explorer

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MAP - Manifold Absolute air Pressure sensor


1.9) MAP- Manifold Absolute air Pressure (sensor)

What is it? The MAP sensor is a device tomeasure the relative air pressure drop in the inlet manifold, as compared toatmospheric air pressure, when the engine is running.

Where is it located? The MAP sensor is most frequently sited either remotely on the middle ofthe fire wall (bulkhead) at the back of the engine compartment, on the innerwing (fender), on the side of the air ducting or directly bolted on to theintake manifold plenum. A vacuum hosefrom the inlet manifold connects remotely located MAPs, but if sited on themanifold plenum there is a direct connection on its underside.

How does it work? When the engine is at idle the throttle plate is fully closed and thevacuum within the inlet manifold is at its greatest, 20 inches (~500mm) mercury.On older MAP designs, sealed bellows (as in a weather barometer) expand orcontract in response to pressure change and this moves an armature in or out ofan electrical coil. The voltage output fromthe coil reflects the position of the armature and therefore the air pressure.
Modern MAP sensors aresmall, membrane-mounted, solid-state, Piezo electronic, strain-gauge sensor devicesproviding the ECU with electrical signal corresponding to the absolute airpressure within the inlet manifold. The air pressure taken in conjunction withair temperature (IAT) provides the ECU with information on the overallmass of air taken in by the engine and it can therefore calculate theappropriate amount of fuel to inject, providing power whilst minimizingemissions. This device also helps adjustthe engine to accommodate pressure decrease with increase in altitude. In normally aspirated engines MAPs measureinlet pressure decrease in the inlet manifold relative to atmospheric pressure butin turbo charged engines MAPs are also capable of measuring the positive (over)pressure of air (boost) delivered to the inlet manifold from the turbo charger.

Symptoms of a faulty MAP
Associated OBD2 error codes DTCs: P0105 - P109; P0121, P0129; P0236 - P0238;P1296, P1297

  • Poor starting/erratic idling/engine stall - with the MAP not sending the correct inlet air pressure signals to the ECU, incorrect fuel injection volumes then result. The imbalance in the fuel/air ratio often leads to rough engine performance and poor starting and stall. The engine might be kept running at start up by pumping the accelerator pedal
  • Sluggish performance/power ceiling - the engine may seem to perform normally in the lower rev range but will severely run out of power above about 3000 rpm
  • Poor fuel economy. The ECU tends to supply an over rich fuel mix to the engine in the absence of signal from the MAP resulting in very poor fuel economy. The reason for this is that if the MAP has no signal this means no vacuum = fully open throttle = engine is under load. To match this 'open throttle' signal the ECU increases the injection cycle to supply more fuel.

How to Check? The device has three electricalpins, one for 5 volts reference, one for 0 volts ground and the third (themiddle one generally) is the 'signal' output. Put a voltmeter positive connector on the 'signal' pin of the connectedsocket (back probe by inserting a bit of wire). Apply suction to the vacuum input, even sucking on it with your mouth,should result in a measurable voltage output. At normal air pressure (open throttle) the voltage seen should be 0volts. As vacuum is applied the voltageoutput should change to about 5 volts (throttle closed at idle). If no transition seen the MAP is faulty.

How to Fix? Replace it


NEXT 1.10) IMR - Intake Manifold Runner valve

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

Engine revs at idle 3.0


Could be one of 5 things going on.. First check for vacuum leaks. You may hear a hissing. If you hear nothing , then check the air intake manifold gasket. This is where the air intake manifold bolts onto the motor. To check this you can start the car up, and spray brake cleaner, engine cleaner, or even wd 40 directly on the intake manifold right where it bolts onto the motor.. If there is any difference in the idle, up or down, that is your problem. This should be checked first as it can save a lot of unnessecary work. If there is no change in the idle, I would check the throttle positioning sensor. This could be sticking and making the car idle high. The next thing to check is the air idle sensor. This is usually located on the side of the throttle body. It has a mushroom shaped plunger inside that controls how much air your engine gets. If this valve sticks, it can be cleaned as well as cleaning the inside of the throttle body where the plunger makes it's contact. A bit of dirt inside there will affect the air flow. If it ends up not being one of these things, but I'm sure it is, have a look at the EGR . This allows exhaust air to be burned or re burned. The EGR can cause idling problems, but usually you'll have black smoke and rough idling with it. Hope this helps you out

Jan 04, 2013 | 1992 Ford Taurus

1 Answer

My chrysler pacifica hesitates at 40 mph and it wont go any faster what could it be


Is your engine management light on (mil) test it with obd scanner for code if light is on. If not you might have an air or a vacuum leak. This is very common! Open the hood and listen for a hissing sound when the engine is running. Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow. If it is hard to pinpoint take some brake cleaner or starting fluid around the intake manifold and vacuum lines and see if the engine stumbles or if the idle is affected. Be extremely careful when doing this!

Also, your throttle body may be carboned up and need to be cleaned! This can cause all sorts of idle and hesitation problems. This is caused by the throttle plate not seating properly. The First thing i would do is clean out the throttle body with some throttle plate and intake cleaner and a small brush.

Another common cause would be the Idle Air Control motor. This is very common on older cars. The IAC motor gets lazy and cant keep up with the fast idle changes. Also when the IAC motor is out, I rec to check the passages for carbon build up. If they are plugged they need to be cleaned out.

Possible Causes
Check for air leaks in the Air Induction system (e.g., in the intake manifold)
Check for air leaks in the PCV system and in its related hoses and/or valve
Idle air inlet passage or throttle bore is dirty or full of deposits
IAC valve has failed
Throttle plate, throttle shaft or linkage is damaged or sticking
TP sensor is out-of-range or "skewed" high

Sep 16, 2012 | 2007 Chrysler 300c AWD Sedan New Cars

1 Answer

THE CAR JERKS WHEN IN IDLE MODE BUT WE RECENTLY SERVICED IT WITH GOOD GENUINE PARTS.


You do not state the age of the car or the type or the size of engine or whether it is petrol or diesel. On older E class models a fault in the over voltage protection relay would cause cars to be very jerky in idle. In general on petrol models I would start with the throttle body. Remove the air ducting between the air filter cleaner and the throttle. Make sure the interior of the throttle, the throttle plate and throttle area behind the throttle plate is really clean. Ensure that all all air ducting joints and vacuum lines to the inlet plenum are free of any leaks. On some engine variants the cam sensor oil seal over time can fail allowing oil to contaminate the electrical connection. Thoroughly cleaning the socket and replacing the 'o' ring usually fixes this. On diesels (3.2 CDi etc) the EGR feed pipe from the exhaust manifold around the back of the engine to the inlet manifold can become clogged with soot. Push a frayed bit of hand brake cable through it to clean it; clamping the cable in a drill chuck can make for a very effective flexible interior wire brush around pipe pipe corners etc. Any further information you can provide as per the opening statement would help in the diagnosis

Nov 10, 2010 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

Motor dies unless you keep your foot on the gas, but not all of the time. sometimes hard to start.


Sounds like an idle problem. The solution should cost you nothing. Remove the air trunking between the air cleaner and the throttle body. Have a clean cloth and some WD40 spray ready. Clean the throttle interior and the outside of the throttle plate. Apply pressure with your finger tips to the throttle plate to rotate it and continue cleaning the throttle area behind the plate and is possible the back of the throttle plate itself. Pay special attention to the edges of the throttle plate. Mounted onot the the throttle body exterior you will find the idle air control valve. This is an electrically operated device that permits measured amount of air past the throttle plate when the engine is at idle to ensure that the engine does not stall. These idle controllers can take two forms a) a simple valve on a passageway around the throttle plate or b) a geared motor that opens the throttle plate a tiny amount. Which ever system is used everything should be spotlessly clean. The IAC valve body can be removed to aid in the cleaning process. Take care not to rip any gaskets etc as you can use them again during reassembly. With everything cleaned up it should be much better. Put everything back together. If problem persists check all vacuum pipes making connection with the inlet manifold for leaks; spraying suspect areas with WD40 will result in a small jump in revs if you hit on a vacuum leak. Also check that your EGR valve is functioning properly and is closing at idle.

Oct 09, 2010 | 2003 Jeep Grand Cherokee

2 Answers

Truck idles at 1500rpm 5.0engin


idle air control valve issue, timing is advanced too far, or your throttle needs adjusted at the throttle body going into the intake where your throttle cable connects to throttle body.

Aug 01, 2009 | 1991 Ford F150

3 Answers

The engine light recently came on and now the engine spurts at acceleration.BMW328


when the engine light comes on the defect on the engine can be a blocked exhaust system or an air leak to the manifold. the oxygen senser monitors the runnig condition of the car and will inform you that the engine is not run correctly. diagnostic can tel you the defect

Jun 13, 2009 | 1997 BMW 328

2 Answers

IDLE PROBLEM


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 14, 2009 | Chevrolet 1500 Cars & Trucks

2 Answers

3.0 jaguar s type wont idle


Check breather pipes, common thing on the jags, dragging oil residue and bad air into throttle, look for oil residue on engine.Good luck Davelee

Mar 23, 2009 | 2000 Jaguar S-Type

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