bbywu - MAF reading was 1.04v

Quick update - Cleaned MAF, removed Y pipe and Cleaned N75 with electrical cleaner. Also went at the throttle body although there was minimal dirt to be seen. I did see traces of oil in the Y pipe towards the F pipe, is this normal?
Unfortunately there was no change to the cold start, still lumpy and missing. I managed to see 0.8 bar on an empty carriageway this afternoon so ignore my previous comment.

Next up is coilpacks..

P.S I was unable to take coolant temp readings, I couldn't find an option to log it?

 

mafs/plugs/coils. sounds as if you diy. why not new plugs with new coils.

 

Will do, thanks for all the input

 

I was hoping this was a simple quick easy fix - bad or dirty MAF. 1.04 sound okay, and you cleaned the MAF and then some.

 

In an effort to keep the thread up to date I took the car out for a quick drive after work. Again a minute or so after start up as the warm idle tried to settle in the car began misfiring. I took a closer look at MAF readings which fluctuated constantly between 1.5 & 2.0v. This settled into a fairly constant 1.5v once warm at idle

Misfires showing:


I saw another 2 misfires in cylinder 6 over a period of 10 mins when fully up to temp, none on boost

Making up a shopping list of goodies to do along with the coilpacks (sparks, exhaust heatshields etc.)

Would anyone suggest replacing o2 Sensors whilst i'm in there or would that be overkill?

 

Recommend replacing the 2 variocam brackets when you do the plugs. They are cheap, easy to replace when you are doing the plugs, and a know failure point.

 

i think once you've ruled out NEW maf/coils/plugs simultaneously.. you'll know more. hoping.

 

Any updates on this? I have something similar going on. On a cold start with the AC on, the idle dips and the engine dies?! Without AC, it is pretty much normal; it does seem to surge up above 1k rpm a bit but returns back to normal fairly quickly. Once warmed up, idle is normal (with and without AC). I also noticed acceleration in low rpm in 1st and 2nd gear is a bit choppy; high rpm and WOT seems fine.

I'm thinking small boost leak? MAF is new but the issue started before replacing the MAF, so likely unrelated. I feel like it got a bit worse over time, that's why I'm thinking boost leak. No codes.

Thoughts?

 

My issue was finally resolved a few weeks ago. According to my mechanic, the gasket on the throttle body was folded over slightly. $3 part with minimal labor fixed the problem for me. Maybe Markski is onto something with his incessant boost testing

 

Awesome! Cleaning the throttle body is on my list as well.

 

Which gasket on the throttle body, if you don't mind me asking? Was it the short length of tube that connects the Y-pipe to the T-B? I can see how this could be "folded over" if the clamp comes off.

 

gummed up/semi dirty TB from lots of city driving and less WOT than the car would like. try some more often WOT events. think about how infrequently in the city anyone ever WOT's. the gas here is dirty shyte and the gummy works will cause cels to throw.

also.. possible miniscule split in the f hose. never was the maf. try my first suggetion. it has worked for me. GL.. it's frustrating when all else seems fine. this i know.

 

Cleaning the tbs on my Audis is a regular thing along with maf cleaning/replacement usually puts them back to normal= no problem 996tt yet lol.

 

I'll check throttle body first since i can do that myself. I assume it is were where the Y pipe connects and is easily accessible?

Since the car was dealer serviced all its life, I assume the throttle body has never been cleaned. If that doesn't solve it, I'll have my mechanic smoke it for boost leaks.

At least the ABS/PSM error has not resurfaced, so it looks like the new MAF fixed that problem.

 

disconnect the mad harness at the air box and see if it goes away..