car has some major issues

[CELWarrior]

This has been an ongoing problem for a while and my stealership cant seem to give me an answere and i cant figure it out as well. On cold start up there is a high pitch wine from the front accompanied by my car sputtering for 30sec - 1 min. then all calms down i pulled some codes (p1128. p0300. 0301, 0302, 0303, 0304.) i replaced the coils and plugs, the MAF is a month or two old, those were my ideas. the dealer said it was my cat or turbo?! i dont blow any smoke there is no shaft play and the blades spin fine and i have a gutted cat so it cant be that. and my car is in limp mode so i have no power. with the exhaust off at the downpipe it starts to misfire when i hit boost. This car just plain hates me. what could be plaguing my car

2000 A4 1.8T

[Seerlah]

The misfire codes are obvious. That is the reason your car sputters from 30 seconds started up to 1 min.

P1128, P0300, are the basis of your codes and the rest just tell which cylinders are mifiring. You can look up the meaning for the codes from here. I highly doubt spark plugs or ignition coils are your problem. It has more to do with a fueling issue. Check your fuel injectors to see if they are seated and plugged properly.

FWIW, I am doing the same thing tommorow. I have fueling issues and need to find out why.

[CELWarrior]

ya i was just thinking about that i know they are seated correctly cus i was doin some tinkering at work. I was thinking about a seafoam or running some injector cleaner. could it also be a coolant temp sensor cus ive heard some talk about that?

[Seerlah]

I am no expert, but maybe another can chimme in. But if you want to check the sensor, then clean the connectors. There are maybe 5 codes that are designated for issues with the coolant tempurature that can lead to the sensor being the issues (and there are other codes that have the sensor being a factor in it). In the codes you listed, none of the solutions granted by Ross Tech pointed to a bad coolant temp sensor. But once again, I am no expert.

I know tommorow I will heave to find out what is up with my fueling. I replaced the valve cover gasket for my engine, then threw 3 codes afterwards. One of my codes is the P0300, just as yours. Here is what Ross Tech said about that:

Possible Causes
Air Intake System leaking
Fuel Supply faulty
Injector(s) faulty
Ignition Cable(s) and/or Spark Plug(s) faulty
Ignition Coil(s) faulty
Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
Camshaft Position Sensor (G40) faulty
Possible Solutions
Check Misfire Recognition
Check Air Intake System
Check Fuel Supply
Check Injector(s) and Injector Sealing
Check Ignition Cable(s) and Spark Plug(s)
Check Ignition Coil(s)
Check Exhaust Gas Recirculation (EGR) Valve (N18)
Check Camshaft Position Sensor (G40)

So I will take those steps. I am thinking it is just a short in the ingition coil harness or something and it would be something silly like me just moving the harness a little bit to remedy. But I will check other things as recommended.

My advice for you, is to follow the recommended solutions on Ross Tech. Or wait for another more knowledgable about these sitiations to chimme in.

[CELWarrior]

well thank you for your input i have already put some fuel injector cleaner in my tank and hoping that makes some improvement

[CELWarrior]

to maybe make things a little clearer it only misses on cold start up and most of the time when i hit about 3000 rpm. but the odd part is on a rare occasion it will take off on my and easily go past the 3 grand mark and not misfire at all.

[Seerlah]

For some odd reason I think it is a really simple solution such as replacing spark plugs. When did you replace plugs (yes, I saw in your original post, but when?) and what are your mods, if any?

[CELWarrior]

plugs about a month ago. and all i got is a cone filter and a gutted cat but i haven't done anything about the rear o2 sensor yet. i just jutted it cus my "all powerful" stealership said that might be the problem

[Nebone]

Try a coolant temperature sensor. It's cheap and takes 2 minutes to change. It's right at the back of the head.

[CELWarrior]

i actually have one ordered it comes in tomorrow

[crono35]

may want to look into the ICM too. If you have a buddy with a 1.8T, just swap em out - it's right above your air box, held down by 2 screws. Takes 10 minutes to swap em and find out if that's causing your issue.

[CELWarrior]

i would but my year doesn't have an icm. im actually cleaning my MAF right now

[CELWarrior]

WTF i am kicking myself in the ass right now cleaning my MAF worked!!! i cant believe i ruled that out it was that simple

[CELWarrior]

nvm it still runs like crap on cold start up. Where is that coolant temp sensor located cus i cant seen to see it behind the head

[CELWarrior]

and the coolant temp sensor didn't do anything and i still have that stupid p1128 and random misfire codes