My check engine light is on again for misfire codes and fuel trim running lean. I thought I should look for a vacuum leak. anyone else have any ideas?

 

What cylinder? I would check the plugs first, & swap the misfiring one. If it stays on that cylinder, swap the coil pack. If it moves to that cylinder, you need a new coil pack.
The LTFT, can be a faulty, O2, or EGT sensor that isn't bad enough yet to throw a code. Yes, you can check for boost leaks, but what bank were these on? The same?

 

I will check tomorrow. I have Vag-Com I will just copy them all down and post here. thanks for the help

 

Check for a leak..

 

The misfires have left and have not returned

Here is a small list of current faults I just cleared :

17538 - Fuel trim : Bank 1 (mult): system too lean
P1130 - 35 - 00 --

17536 - Fuel trim : Bank 2 (mult): System too lean
P1128 - 35 - 10 --- Intermintent

These are the things I am going to check:

- MAF sensor
- Fuel pressure
- Intake system for leaks
- O2 sensors before and behind cats
- Fuel injectors

 

Do you have a Vag-com you can log block 115 & see if the actual & request is the same.? I would also check the EGT sensors, as per the Bentely manual. You can just unhook the MAF & drive it around, after you clear the codes, if they don't come back, try cleaning the MAF, if that doesn't work you will need a new MAF.

 

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