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I have a 2003 VW Jetta 2.0l. Recently, when it has either

Customer Question
rained or gets damp outside...
I have a 2003 VW Jetta 2.0l. Recently, when it has either rained or gets damp outside, my car won't fire. The ignition itself tries to turn the car over but the engine won't fire. The auto dealership changed the control module but that didn't help. Can
you let me know what is causing this or what route I can take to eliminate other possibilities?
Submitted: 2 years ago.Category: VW
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Answered in 1 hour by:
12/13/2015
VW Mechanic: eauto, The Car Guy replied 2 years ago
eauto
eauto, The Car Guy
Category: VW
Satisfied Customers: 16,740
Experience: ase certified tech
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did they replace the coil? is the engine light on?

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Customer reply replied 2 years ago
No they did not replace the coil and Yes the engine light is on.
VW Mechanic: eauto, The Car Guy replied 2 years ago

what codes are present?

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Customer reply replied 2 years ago
Don't know. So far 2 of the 3 times this has happened, the car has started. The time it didn't, no codes showed up.
VW Mechanic: eauto, The Car Guy replied 2 years ago

The symptoms point to the coil ..spray a little water on it with a spray bottle and then try to start it...

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Customer reply replied 2 years ago
Ok. I will replace the coil and see what happens. Thank you. I just purchased a code reader off Amazon so if it happens again I can see if it gives me an error code. Thank you.
VW Mechanic: eauto, The Car Guy replied 2 years ago

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Customer reply replied 2 years ago
I just tried to start the car again and it back fired!
VW Mechanic: eauto, The Car Guy replied 2 years ago

after getting the coil wet??

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Customer reply replied 2 years ago
No. The hasn't started since this morning. I wanted to see if it would start after waiting a while.
VW Mechanic: eauto, The Car Guy replied 2 years ago

I would guess its the coil.................

We will have to pinpoint what the engine is missing.

Spark

Fuel

Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition

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Customer reply replied 2 years ago
I'll let you know tomorrow when I do the testing.
VW Mechanic: eauto, The Car Guy replied 2 years ago

great

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