Injector problem

RENATO MOSTERT

MEMBER
2004 VOLKSWAGEN JETTA
1.6L
4 CYL
2WD
MANUAL
140,000 MILES

Hi, i'm having injector problems injector 1.2.3 are dead however injector 4 appears to be stuck open when I just switch on vehicle it fires others are not working! I replaced them but still same problem. Checked all sensors as well as wiring they too are fine. Any help please i'm far from diagnostic tools. Please!

Friday, June 26th, 2020 AT 8:06 AM

4 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

I would be happy to help. I need to know the correct engine size. It should be a 1.8T, 2.0L, 2.8L, or a 1.9L diesel.

Let me know. Also, let me know if you have checked body grounds around the PCM and engine compartment.

Take care,
Joe

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Friday, June 26th, 2020 AT 7:57 PM

RENATO MOSTERT

MEMBER
2 POSTS

Hi Joe,

Unfortunately its not a diesel vehicle it is gasoline and it has a 1.6lt engine. All ground wires I have cleaned and none have any damage.
Regards,
Renato

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Friday, June 26th, 2020 AT 11:31 PM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Hi,

Okay, this must be one for a different location and not offered in the US. But lets try something. Since I don't have info on the 1.6L, I will need you to trace the wire from the injector to the power-train control module. At that point, back probe the wire and see if there is an injector pulse.

I am basing this on the idea that all sensors are good as mentioned.

Joe

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Saturday, June 27th, 2020 AT 8:48 PM

STEVE W.

MECHANIC
15,233 POSTS

If the single injector is shorted on and the others appear dead but changing the injectors didn't help I would think the injector driver FET inside the engine control module has failed and is shorted. That would turn on that injector when the key comes on but the others wouldn't work.
A 2004 would likely be known as the VW Bora in other countries, Jetta is the north american and South African name.

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Saturday, June 27th, 2020 AT 9:03 PM