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internal88
internal88, VW Mechanic
Category: VW
Satisfied Customers: 2517
Experience:  I've been working in the automotive industry for over 10 years. Diagnostic is my strength.
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Engine has a miss I put a tester on it ODB and it shows a

Customer Question

Engine has a miss I put a tester on it ODB and it shows a miss in different Cyls at different times I am not sure if its the fuel pump, map sensor, or just spark plugs.
Submitted: 1 year ago.
Category: VW
Expert:  internal88 replied 1 year ago.

Hello, I'm Brandon - VW Tech.

It is most likely the ignition coil is bad.

Expert:  internal88 replied 1 year ago.

This is the main reason why it is misfiring.

Expert:  internal88 replied 1 year ago.

Bremi is a good VW brand.

Expert:  internal88 replied 1 year ago.

please rate me positive for the prompt service. Thank you!

Customer: replied 1 year ago.
What do you think about the MAS being bad?
Expert:  internal88 replied 1 year ago.

Yes, it is possible the mass air flow sensor is faculty.

Is the check engine light on?

Customer: replied 1 year ago.
engine chk light came on but fault was cyl miss .
I will check coil(s) tomorrow and get back to you.
Expert:  internal88 replied 1 year ago.

You have a OBD2 data logger to check the coil performance?

Expert:  internal88 replied 1 year ago.

This is computer where it can check the spark duration.

Customer: replied 1 year ago.
I am down to # ***** cyl not firing spark is good compression 160. is there any module that fires #1 or relay or anything?
Expert:  internal88 replied 1 year ago.

The module and the coils are together as one unit. VW have a change on the coil. You need to get the latest coil from the dealer. Their unit is most up to date.

Customer: replied 1 year ago.
Changed coil pack from another VW that was running fine --same problem #1 cyl pulled plug wire while running and it made no difference, how about a bad injector?I am going to pull VC tomorrow to see if I have a valve spring problem or some other problem. Compression of 160 doesn't sound like a spring but I'll check anyway. Is there any module that controls #1 CYL.
Expert:  internal88 replied 1 year ago.

Yes, a stuck injector can cause a miss. I will check the schematic tomorrow morning. Will keep you posted.

Expert:  internal88 replied 1 year ago.
Hi, I am getting back to you.
Are you sure the engine you have is a 3.6 liters? Because 3.6 liters came out in 2006 not 2002.
Customer: replied 1 year ago.
No it is 3.0(2.8)
Expert:  internal88 replied 1 year ago.
I would like you to do this test.
1. Have the car running the engine and spraying a (MIST) of water on the wires. If the car suddenly starts to run rough or even stalls, then you can go ahead and replace the wires. Don’t use your hands to check, or you’ll get a jolt!
2. Buy a bottle of techron put it in the fuel tank and run the car in the highway. The techron will help clean the fuel injector.
Try these test first before spending money on parts.
Customer: replied 1 year ago.
I still have this miss in # ***** CYL it seems like a bad injector when I plug the injector in it gets very rich in #2 and fouls the spark plug the smell of raw gas is heavy. does the modual on the coil pack control the the injectors?
Expert:  internal88 replied 1 year ago.

Motronic Engine Control Module (ECM) control the fuel injector not the coil.

Expert:  internal88 replied 1 year ago.

The injector can be leaking a cause the injector to fail.

Expert:  internal88 replied 1 year ago.

The fuel injector can be changed individually.

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