JoshhB

Hey guys. I'm brand new on these forums and have just purchased a 2001 A4 1.8T AWM engine code. my car is cranking for a very long time before starting, this is both cold and hot starts. once it finally starts there is still a large stumble before it levels out at 900rpm. it has been getting slowly worse and the only code I am getting is a P0172.

I have changed the spark plugs and coil packs so far. before spending any more money I want to get a more solid idea of what this could be.

4Driver4

I'd be very curious to know what the P0172 code means.
I'd also be interested in what codes VAG-COM shows.
Maybe check the temp sensor reading through the measuring blocks.

Reggie

http://www.obd-codes.com/p0172 Google can be your friend.

So a couple of things could be causing this. A leaking injector being one. I would run a can of BG 44K through the car gas tank. Some people like seafoam - it is stronger but maybe more appropriate in this situation.

After that you almost have to go to a independent shop to get to the root cause

JoshhB

unfortunately I dont have access to a vag-com. I just have a cheap OBD2 reader. I will have to pick one up soon

JoshhB

thanks reggie! I will try that out in the morning and see.

JoshhB

Also wondering if this could be related. Around the same time these symptoms began my central locking pump **** the bed. whenever I get in my car I can hear the locking pump going for a solid 10 seconds or so, could that be drawing too much power on startup and making it harder to turn over?

4Driver4

My point exactly. Posters who take the time to at least Google the code get better answers. I'm happy to help, but I'm not a librarian.

My guess is a boost leak.