Hard starting when hot is usually a retarded timing problem. Or a slow starter. But since turning the GPs on (what happens when you remove the temp sensor) solves the problem, I'll bet on the timing.
Full Answer
Why does my car have trouble starting when the engine is warm?
The most common reason a car is hard to start when warm is due to a defective crankshaft or camshaft position sensor. However, it could also be caused by a clogged air filter, faulty battery connection, vapor lock, or a bad ground connection.
What can cause a golf 1 not to start?
Running out of gas, a clogged fuel system or a broken fuel pump will all prevent the vehicle from starting. Faulty spark plugs and a broken starter can also be problems in this case.
What are common problems with VW Golf?
Below are some of the model's most common problems reported by its users:Engine Misfire. ... Interior Accessories Problems. ... Fuel Pump Failure. ... Transmission Issues. ... Power Window Failure. ... Premature Brake Wear. ... Mass Air Flow (MAF) Sensor Failure. ... Overheating Engine.More items...•
What causes a Volkswagen to not start?
Battery Problems One of the most common reasons a car won't start is a problem with the battery. In many cases, the battery isn't supplying enough power to the starter system. The engine may crank slowly but not start. Often the lights on the dashboard won't light up.
My Golf mk4 TDI will start if left over night first time but when I try again it won't start
Timing is likely out of spec, you need a vag-com to set timing on a TDI. even the dealer who did mine didn't know this and screwed it up. I set mine with this vag-com program from ross-tech and now it starts great and gets better fuel econ.
Need to know where the speed senser is located on a vw golf tdi mk4
on the gearbox, between cockpit and engine. On the gearbox are only 2 sensors. one for reverse lamp, and one for speed.
My Golf Mk4 TDI's lights have started pulsing with the sound of the engine idling rough however rev counter stays pretty steady. putting a multimeter across the battery whilst ignition is off gives a..
voltage sounds kinda high for while its running. the voltage regulator in the alternator sounds like it is bad. i would replace the alternator.
Turbo problem...dealer replaced valve...still
If you have a problem that isn't caused by something obvious, you need a Ross tech VCDS cable. This is a laptop computer diagnostic cable to talk to the car's computer. Without it you cannot do the more advanced tests.
Golf mk4 tdi major oil leak from lower engine. oil warning light on
If is loosing oil too fast the light will come up,because oil pump won't compesate for oil pressure lost without proper oil level.Anyhow,i'm thinking oil pan has bad gasket or, or possibly could be hole in the pan.It happens when small rock on the road hits pan so hard it will make a hole.Cheap materials like Magnesium sulfate that are commonly used on VW's these days are just not quality.Hope I could help you..
How do I change the speed sencer
What model golf is it ? I have a 98' mk4 tdi, mine speed sensor is just on top and to the rear of the gear box. easy to reach, 22mm spanner required. Hope this helps !
Why is it so hard to start a hot engine?
When the engine is too hot, fuel can't circulate properly due to the way in which vapor obstructs it and therefore ...
Why won't my car start when it's too hot?
When the engine is too hot, fuel can't circulate properly due to the way in which vapor obstructs it and therefore the engine wouldn't start as easily as it should or it wouldn't start at all. A car engine would keep on gaining temperature until a while after it was shut off.
Why does gasoline evaporate in summer?
Sometimes gasoline refiners change from a higher volatility fuel to a lower one when summer approaches due to the way in which hot weather causes fuel to evaporate easier. If refiners change back to a higher volatility fuel while the engine is still exposed to days of high temperatures, this could cause the fuel to evaporate too much creating too ...
How long does a car engine keep gaining temperature?
A car engine would keep on gaining temperature until a while after it was shut off. During this period of time is when the highest amount of vapor would be circulating around and therefore that is when the chances it obstructs the engine are bigger as well.
Can a hot engine cause a car to not start?
Reviewed by. H.R. Helm. on Nov 15, 2019. Although usually engines exposed to cold weather is the most known problem related to car starting difficulties, hot engines might bring obstacles as well. Many people realize that the car does not start as easily as it should when the engine is hot and do not know what to do about it.
Why is my car not starting when it's warm?
Several faults can cause your car not to start when warm. Photo in the Public Domain. If your car is hard to start when warm, you can trace the issue to one or more several potential faulty components, for example: Clogged air filter. Corroded or loose battery terminal or cable. Corroded or loose engine ground connection.
Why is my starter hard to start?
Internal starter motor connections wear down over time, causing a hard-to-start condition when the engine temperature rises. A starting motor use brushes (carbon bars) and a commutator (slip ring) to allow current flow to the armature and keep the windings spinning inside.
Why does my engine start when it's warmed up?
Sometimes, a faulty fuel pump check valve may cause starting problems when the engine has been warmed up.
What happens if fuel injectors are hot?
If the fuel lines are hot, under hot weather conditions and a hot engine, the fuel will have room to evaporate inside the line , creating a hard-to-start condition. Other symptoms of a bad FPR:
What happens when a fuel line sticks in the close position?
If the vent line clogs or the valve in the line sticks in the close position, vapor will mix with the fuel as it rushes out of the tank, causing engine performance issues.
How long does it take to diagnose a warmed engine?
One or more electrical sensors. Sometimes, diagnosing a hard-to-start warmed engine can take you a few minutes; othertimes, it may take some probing around different potential components or systems.
What happens if an engine starts for a couple of seconds?
If the engine starts for a couple of seconds or seems like it wants to catch, most likely not enough fuel or no fuel is reaching the cylinders. Concentrate on the fuel system: fuel pressure regulator, fuel filter, fuel pump, check valve in the pump assembly, fuel injectors, etc..
What happens when an engine is hot?
When the engine is hot, disconnect the coolant sensor and see if the engine starts quickly. If the engine starts fast, it is not hot glow plugs that make starting faster -- it would either be more fuel injection advance or more fuel injected during engine crank.
What causes a fuel charge to ignite?
It is the high temperture of the air in the cylinder that ignites the fuel charge caused by air being highly compessed. That's how compession ignition works. If you can not get a good amount for air in the cylinder the temperture of the air is lower causing a no fire in that cylinder.
