jrwill

I'm new to Audi and german vehicles in general, just picked up this 2000 Audi a4 1.8t quattro a few weeks ago. Just recently it started acting funny and popped a CEL, on cold starts it struggles really hard, misfires, and sounds like its going to die, then within 30 seconds it evens out and sounds perfect. There's some pretty off and on hesitation while driving as well, I've noticed it more on hot days, and if I turn the A/C on it really hesitates to the point where it's undrivable and I stall it.

When I originally scanned the code, it was just P1128, did some searching and I have a MAF on the way, hopefully to fix that one. I went today and got the codes rescanned to see if anything has changed because it seems to have gotten worse and came up with this list.

P1128
P0300
P0301
P0302
P0303
P0304

Seems like a misfire in every cylinder and I have no clue what could be causing that.

jseklund

Disconnect your MAF, clear the codes, and idle it. See if it still misfires. If so, see if a specific cylinder is misfiring. You may have a bad coil pack at that point, and it may be bad enough it is throwing off other cylinders.

However, my guess is disconnecting the MAF will not make it run perfect, but will alleviate the misfire and that points to the MAF being bad...so the new one may be the fix.

The next thought I have is the Coolant Temperature Sensor (CTS). It cost less than $20 and is relatively easy to replace. They tend to go bad and cause cold start issues.

jrwill

So I got a new MAF, installed it and everything was running amazing! Way better than when I bought it. Then just a few days ago, it starts misfiring again. I can drive the car lightly and it runs fine, once I start to open the throttle there's a really jerky stuttering and loss of power until i back off again.

Got a code scanner and I have 7 codes now! woohoo! At a total loss right now, I have no clue what I'm doing anymore.

p1128
p0300
p0301
p0303
p0302
p0304
p0411

jrwill

I also forgot to mention that when I installed the new MAF, all the codes cleared themselves within a day and it was running flawlessly.

clancy

Check this thread. https://www.audiworld.com/forums/tt-...olved-1955853/