Idle is usually @ 650rpm and the car shakes when it drops to 500rpm when the rad fan turns on. 75aces Administrator
Full Answer
Why is my VW Golf idling rough?
There are quite a few reasons why your Volkswagen Golf could be idling rough. An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition.
Why does a diesel engine idle rough?
A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist. If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.
What causes a fuel injector to go bad on a VW Golf?
If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air. There are many reasons why a fuel injector may go bad, as well as different symptoms relative to how they went bad. For more, check out Volkswagen Golf bad fuel injector symptoms.
What does the Check Engine light mean on a Volkswagen Golf?
Hopefully, the check engine light is on. It can tell you a lot about what is going on with your Golf. You can either go to the local parts store and ask them to scan the vehicle for you, or you can do this yourself. Most of them will do that as a courtesy (obviously they want to sell the parts). Alternatively, code scanners are pretty affordable.
Why does my car shake when I turn on the fan?
The fans can cause the vehicle to shake and vibrate. If you suspect the problem lies with the fans, start there. Check for any broken fins, extra noises, debris, or other obvious signs of damage. If the fans appear to be okay, and do not look out of balance or restricted, turn your attention to the engine.
What are the symptoms of a faulty cooling fan switch?
Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.
How do I know if my radiator fan relay is bad?
Keep a lookout for the following bad cooling fan relay symptoms:The engine runs hot or overheats. ... The cooling fans don't work. ... The cooling fans keep running. ... Warning lights. ... Poor air conditioning performance. ... Swapping Relays. ... Measuring the Relay Coil's Resistance. ... Listening for Noises.More items...•
When should radiator fans kick on?
about 200 degrees FahrenheitYour radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.
What are the symptoms of a failing thermostat?
Thermostat failure symptoms that you should knowHigh temperature readings. The main symptoms of a failing thermostat are related to engine overheating. ... Erratic changes in temperature. ... Leaking coolant. ... Increased fuel consumption. ... Unusual noises.
What sensor turns on the radiator fan?
coolant temperature sensorOn most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor.
What relay controls the radiator fan?
cooling fan relayThe cooling fan relay is the relay that controls the engine's cooling fans. When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans.
How do you test a radiator fan control module?
0:344:50How to test the radiator fans - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo just right off the bat. We can see if we give this 12 volts and you gotta be careful you gottaMoreSo just right off the bat. We can see if we give this 12 volts and you gotta be careful you gotta know which one which one's your wire. You can see that the fans are working.
How do you test a radiator fan resistor?
2:573:34WHAT RADIATOR FAN RESISTOR IS. WHAT IT DOES AND ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipSomething like that and they're not very expensive you can check out in the description of the videoMoreSomething like that and they're not very expensive you can check out in the description of the video below. We'll.
Why does my TDI cooling fan run after shutting the engine off?
Rest assured—this is in fact normal operation. The after-running of the cooling fans is deliberate and can sometimes last up to 16 minutes after switching the engine off. The after-running process prevents excessive engine compartment temperatures caused by the diesel particulate filter regeneration cycle.
Does the thermostat control the radiator fan?
The thermostat opens and closes when there is a need to. How it works is simple. When the temperatures outside are cold the thermostat stays closed and the coolant stays in the engine. When the coolant reaches the working temperature the thermostat opens and the coolant circulates through the cooling system.
What temperature does a fan clutch engage?
about 170°FAt what temperatures do fan clutches engage? Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature). They reduce the temperature about 20°F before disengaging.
Why is my Volkswagen Golf idling?
There are quite a few reasons why your Volkswagen Golf could be idling rough. An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition.
Why is my golf idle?
Ignition System. Here are the main components of the ignition system, as well as what would cause them to make your Golf idle roughly. Spark Plugs – One of the absolute most common causes (if not the most common reason that your Golf may be misfiring) is the spark plugs.
Why does my fuel injector go bad?
If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air. There are many reasons why a fuel injector may go bad, as well as different symptoms relative to how they went bad. For more, check out Volkswagen Golf bad fuel injector symptoms.
Why is my golf engine running so lean?
The heat of the exhaust can also bake the wiring going to/from them over time. If an oxygen sensor goes bad, it can make your Golf run too lean (or rich). A super lean running engine will often idle rough.
What happens if a coil pack goes bad?
If a coil pack goes bad, it’ll cause a misfire and rough idle condition. Really, your Golf will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Golf happens to have them, ...
What happens when the fan comes on?
After a moment the idle will return to normal. Then once the fan turns off the idle will jump a bit and then return to normal. Sometimes (but not very often) the engine seems like it will stall when the fan comes on.
Does idle jump up when A/C is on?
As best I remember the idle does jump up when the A/C is on, but it does it the same way as when the radiator fan kicks-on: the idle drops low first (sometimes almost stalling for a moment) and then comes up to a bit higher than an idle without the A/C or radiator fan being on.
