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eauto
eauto, The Car Guy
Category: VW
Satisfied Customers: 15068
Experience:  ase certified tech
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I have a 2003 VW Jetta 2.0l. Recently, when it has either

Customer Question

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: 11 months ago.
Category: VW
Expert:  eauto replied 11 months ago.

did they replace the coil? is the engine light on?

Customer: replied 11 months ago.
No they did not replace the coil and Yes the engine light is on.
Expert:  eauto replied 11 months ago.

what codes are present?

Customer: replied 11 months 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.
Expert:  eauto replied 11 months ago.

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

Customer: replied 11 months 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.
Expert:  eauto replied 11 months ago.

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Customer: replied 11 months ago.
I just tried to start the car again and it back fired!
Expert:  eauto replied 11 months ago.

after getting the coil wet??

Customer: replied 11 months ago.
No. The hasn't started since this morning. I wanted to see if it would start after waiting a while.
Expert:  eauto replied 11 months 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

Customer: replied 11 months ago.
I'll let you know tomorrow when I do the testing.
Expert:  eauto replied 11 months ago.

great

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