Random misfire, intermittent hard start

[Matt E.]

Hi, I'm new to the forum. My son has a 2015 A3 2.0t premium plus. It has a random misfire under load. It's usually right after it shift into 2nd or 3rd around 2000rpm, give or take. It'll misfire a few times but go away if you continue to accelerate. I work on heavy trucks and have a heavy truck scanner. I was able to check codes with it and no active or inactive codes are set. When I look at the misfire parameters all four cylinders show 3 or 4 misfires on the last drive cycle. My son also said that intermittently he has a hard start condition (I have not experienced the hard start). It's very intermittent but seems like it only happens when the engine is warm. Has anyone had similar issues or any ideas what might be causing this?

Thanks!

Matt

[cliffcoggin]

Matthew.

Not casting aspersions on your particular code reader, but many are incapable of correctly reading Audi codes. It may pay you to get it done professionally, or to get a OBD11 reader which seems to be successful amongst knowledgable users here.

[Matt E.]

I am aware of that issue which is why I pointed out the type of scanner I was using. There is no check engine light, nor has there been. I have pulled misfire codes from this car before with that scanner (that time it just needed plugs and coils) and it is showing the misfires on the previous cycle. I think it just doesn't misfire enough times to trigger the code.

[Stevey Y]

4 hours ago, Matt E. said:

I am aware of that issue which is why I pointed out the type of scanner I was using. There is no check engine light, nor has there been. I have pulled misfire codes from this car before with that scanner (that time it just needed plugs and coils) and it is showing the misfires on the previous cycle. I think it just doesn't misfire enough times to trigger the code.

Hi with the correct scanner I have no doubt there would be codes of some description, these vehicles log everything including the day/date of the incident plus the times and frequency of the misfires, you wont get a light on until whatever is causing this goes terminal, there are a lot of scan tools on the market that for not much outlay will retrieve the resulting codes, come back with them and we may well be able to help.

Steve.

[Matt E.]

Do you have a recommendation on what scan tool I should use? Or, does anyone have a recommendation for a reputable Audi shop in central New Jersey? I've dealt with a couple and was not very happy.

Thanks

[Steve Q]

Obd11, vcds, vagcom or Ross tech are all good. 

[Matt E.]

Ok, thanks