Best Answer

I have a 99 VW Passat. Having it not start has happened to me, several times, and it is infuriating. Esp. because it seems to be related to the computer. Did you happen to have run it for a short time, say, to move it in the driveway or something, and then turn it off? And then, the next time you went to start it, it wouldn't start? A mechanic told me that something in the computer gets confused if you do that--to never just run it for a minute and then turn it off--let it run for at least 5 mintues. I've had to have this car towed more than any other car I've ever owned, and I've owned an old Alfa Romeo and a Ford pickup. Grrr. Good luck.

It's the coolant temperature sensorEngines need a richer air/fuel mixture when they're cold than they do when warmed up. They can do this in several ways--dump in more gas, cut down the amount of air or screw with the ignition timing.

There are two problems described here, and both are caused by the same thing. The first is that the car won't start in the cold...which means the sensor is reporting the car's warmed up when it's dead cold. The extra gas the engine needs isn't coming in, so the engine will not start. The other, where the "computer is getting confused" after you start, shut down after a minute then try to restart, is that the engine isn't warmed up yet but the defective sensor claims it is. The engine still needs the gas, but it's not getting it so you don't start.

User Avatar

Wiki User

โˆ™ 2010-10-17 04:11:19
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What would cause a 1999 VW not to start on cold mornings but run perfectly any other time?
Write your answer...
Related questions

Hard to start 1994 jeep wrangler in mornings?

my jeep wrangler is starting to have a hard time to start in the mornings? my jeep wrangler is starting to have a hard time to start in the mornings?

What would cause a 2000 Toyota Sienna to crank but not start in the summer mornings but will start after the outside temperature heats up in the afternoon?

moisture on the ignition coils.spray them with silicon spray.

What cause a 1988 Volvo to not start but when jumped works perfectly and nothing is wrong with the battery?

try replacing the alternator

Why do mornings begin early in Antarctica?

Mornings can being early anywhere on earth: this phenomenon is not limited to Antarctica. Generally, the start time depends on the task at hand.

What percentage of Americans either drink tea or coffee to start their mornings?

The percentage of Americans that drink tea or coffee to start their mornings range from 50 percent to 80 percent. 50 percent of Americans drink coffee at least once a day.

What is special about mornings?

It is the beginning of a brand new day!!!! Kind of like you can start things over. And one good things about mornings is breakfast!!!

What would cause a 1988 Pontiac Firebird 2.8L V6 start and idle perfectly but start to spudder out at about 3500 RPM's?

Try changing the oils the relate to the spudder and idle. Then try and time it.

Should school start at 10 am?

So we can have time to get ready in the mornings without being in such a hurry!!

Would a warp engine head cause a car not to start?

Probably not, although it could lead to other problems which would cause your car not to start.

My 1989 prelude SI FI will not start in the mornings until you keep trying?

A 1989 Prelude SI FI that will not start in the mornings until you keep trying could mean that your air filter needs to be replaced. A dirty air filter could result in starting problems.

What happens when an air temp sensor goes bad?

A faulty intake air temperature sensor can cause a number of issues in a vehicle. Among these problems are taking longer to start on cold mornings and increased consumption of fuel.

How soon can you tell you are pregnant without a pregnancy test?

As soon as you start getting your nausea feeling in the mornings.

Why won't my 1992 Saturn Ion start first thing in the mornings?

Because there is no such thing as an Ion from that year!!!

What would cause a 2000 ford focus not to start first time in mornings - you have to put foot on gas for it to start?

adjust your idle screw at your throttle body and check your cold idle stage stitch at the end of your accelerator cable at your throttle body. it may also need adjusting

Using that to start a sentence?

That you have asked this question is perfectly reasonable.

Why won't Natural gas vehicles start on cold mornings?

on a cold morning the gas compacts and liquefy do to tempter thus your engine is not getting enough fuel to start

Why do lions sleep all day?

lions love to rest in the mornings and evenings because, they get to rest and start their hunting at night.

Will a bad tps cause engine not to start?

It could, along with dozens of other possibilities.

Why does a 1989 Tempo start in the afternoons but not in the mornings and how can you fix it?

Your distributor cap may have moisture on the contacts in the morning, but it dries out in the afternoon, thereby allowing you to start the vehicle later in the day.

What cause the engine to rev up when you start the car?

It's an automatic idle, the motor needs to run at a higher RPM for a few moments to lubricate the valves and pistons, perfectly normal operation.

Is it grammatically correct to begin a sentence with She?

It is perfectly fine to start a sentence with "She". However, it would be incorrect to start a paragraph with she.

My Subaru Forester 2002 does not start properly in the mornings since the check engine light came on What do you do?

Have vehicle scanned to determine the problem

What happens when you stereotype people?

it is perfectly normal. when you first set eyes on a person you start stereo typing them. even if you don't want to it is perfectly normal.

How do you survive sixth grade?

You survive it like all of your other grades. Of course this is the time where you start developing more, but trust it's perfectly normal and you'll get over it.

Brownish creamy mucus and about to start your period what does this mean?

It means you are perfectly normal.

Study guides

Create a Study Guide