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

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


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


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

1 Answer

My 2002 Chevy Blazer starts, then RPMs drop and it stalls. I take the key out, then insert it again, start it again and it runs fine. It does this intermittently - 3 times this week. Today, it did it, but...

What all did the mechanic check ? Just codes . Did the mechanic check engine sensor data paramitors ? Checks
DEFINITION: The engine runs unevenly during idle. If the condition is severe, the engine or the vehicle may shake. The engine idle speed may vary in RPM. Either condition can be severe enough to stall the engine.
Preliminary Check
Refer to Symptoms - Engine Controls .
Sensor Checks
• Check the heated oxygen sensor (HO2S).
Check for silicon contamination from fuel or from an improperly-used sealant. The sensor will have a white powdery coating. The sensor will produce a high but false signal voltage, or indicate a rich exhaust. The control module will reduce the amount of fuel delivered to the engine, causing a severe driveability problem.
• Check the throttle position (TP) sensor. If a sticking throttle shaft or binding linkage causes a high TP sensor open throttle indication, the control module will not control the idle. Monitor the TP sensor voltage. A scan tool or voltmeter should read less than 0.85 volts with the throttle closed.
• Check the engine coolant temperature (ECT) sensor using the scan tool in order to compare the engine coolant temperature with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more than or less than the ambient air temperature on a cold engine, check for a high resistance in the coolant sensor circuit or the sensor itself.
• Check the manifold absolute pressure (MAP) sensor response and accuracy.
Fuel System Checks
• Check the fuel pressure. Refer to Fuel System Diagnosis .
• Check to determine if a rich or lean system causes the condition. Drive the vehicle at the speed of the complaint. Monitoring the fuel trim will help to identify the problem.
- Lean--The long term fuel trim is more than 150.
- Rich--The long term fuel trim is less than 115.
• Perform the fuel injector balance test. Refer to Fuel Injector Balance Test with Tech 2 .
• Check the fuel injector driver circuit.
1. Disconnect the injector harness connector at the injectors.
2. Connect an injector test lamp between the terminals of each injector connector and note the lamp while cranking.
3. If the test lamp fails to blink at any connector, the test lamp has a faulty injector drive circuit harness, connector, or terminal.
• Perform the fuel injector coil test. Refer to Fuel Injector Solenoid Coil Test .
• Check the evaporative emission (EVAP) control system.
Ignition System Checks
• Check the ignition output using the J 26792 Spark Tester or the equivalent. Refer to Distributor Ignition (DI) System Diagnosis .
• Check for the following conditions:
- Wet plugs
- Cracks
- Wear
- Improper gap
- Burned electrodes
- Blistered insulators
- Heavy deposits
• Check the spark plug wires by connecting a DMM to the ends of each wire in question. If the meter reads over 30,000 ohms, then replace the wires.
Additional Checks
• Check for vacuum leaks. Vacuum leaks can cause a higher than normal idle and low idle air control (IAC) counts.
• Check the IAC operation. Refer to Idle Air Control (IAC) System Diagnosis .
• Check the control module grounds for being clean, tight, and in their proper locations.
• Check the scan tool to determine if the control module is receiving an A/C signal. If a problem exists with the A/C ON, check the A/C system operation.
• Check for the exhaust gas recirculation (EGR) being ON while idling which will cause roughness, stalling, and hard starting.
• Check the battery cables and ground straps. The cables and straps should be clean and secure.
• Check the crankcase ventilation valve for proper operation by placing a finger over the inlet hole in the valve end several times. The valve should snap back. If the valve does not snap back, replace the valve.

Apr 18, 2017 | 2002 Chevrolet Blazer

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