2004 Audi A4 1.8T ISSUES

[Mike.G]

Greetings everyone!

I'm new to this page just registered today so if I should've posted this somewhere else instead of here please let me know as I'm not so savy still :)

So just recently I purchased a 2004 Audi 1.8T. The car of course came with certain issues but none seemed to be big or fixes that would result in big money investments.
The check engine light was on but the guy who sold it to me said it was because something was wrong with the engine and it couldn't pass the smog, BUT THE CAR DRIVES.
So I said ok and purchased it and was willing to work on it myself especially because the price was quite reasonable which is $1700 and it had 90k miles.

I drove it for a week or so until I accelerated at one point and the engine light started flashing. I immediately took it to the closes autozone to get the OBD II and see which codes popped up.

The codes that showed up were the following:
P0171 system too lean bank 1
P0301 Cylinder 1 misfire
P0201 Cylinder 1 injector circuit malfunction
P0706 Transmission range sensor
P0811 Excessive clutch slippage

Now the first thing I did was buy a new valve gasket cover and the tools needed to replace it. No shit the car had issue. During the process I was surprised to find out that the plastic/rubber that's supposed to be in the middle WASN'T THERE AT ALL! My spark plugs were literally swimming in oil. After replacing that I got rid of the P0171 error which to me was a success.

Now after doing some research when it comes to errors P0706 and P0811 which are both connected to the transmission I came to the conclusion that replacing the sensor might fix it. But then I recalled the day I bought it, as the car started moving, water started gushing out from under the car from somewhere near the drivers side. So the new issue that popped up in my head is that my TCM was flooded.
Which one is more possible or more common with these models or could it be both. I just thought that due to the excessive clutch slippage it might just be the sensor but then the water I believe was not a good sign either.

(additional information in case it could help identify the problem more easily: the car feels almost like it got kicked by a horse when it's put in reverse; sometimes runs on high RPM for no reason; it doesn't change gear; sometimes feels like it was put in neutral all of a sudden at which point I have to release the gas, give it a second and step on it again to accelerate)

And my last question is regarding errors P0301 and P0201. I found multiple solutions to both. But there was one that specifically stood out as it was listed as a solution to both my problems. And that is replacing my fuel injector? Should I start there?

(Additional information: weak acceleration, sometimes rough idle)

The reason why I'm asking is because I wanna start with what's obvious and could most possibly be the problem this way avoiding spending money on fixes that would make no sense.

If you guys have question or need pictures I am also willing to attach to make it easier for you to help me :)

Thank you,
Mike

[5ktq]

I'd measure the resistance of cyl one injector, make sure it's not open. Check the wiring. I think it's much more likely to be the wiring than the injector itself.

The trans codes.. no idea, I don't believe in autos so I don't know anything about them. Hopefully someone here has some advice.

Whoever worked on it before that entirely missed the one gasket would work me a bit...

[Mike.G]

If I'm not mistaken the resistance should be between 12 and 13 Ω am I right?

[Mike.G]

So I just ordered this part a couple of days ago because when I was going over all the hoses and the wiring to make sure everything is in place and doesn't look off, I saw that this specific part was being held together by ELECTRICAL TAPE! (WTF!?)
I did some research and found out that this hose leaking could cause a misfire which threw me off a bit.

The specific part I'm talking about is this:

https://www.ebay.com/itm/221966700675

Could this be the cause to my misfire?

[IndoReef]

Yes that could cause a misfire as your car will have a boost leak. That is called the suction jet it acts as a venturi

[refueler]

The suction jet leaking creates a large vacuum leak which is generally cause of the p0171 DTC for the lean condition. Can't help you with the Audi automatic transmission.

[Mike.G]

Thanks for confirming guys! :)

I'll wait for the part to arrive, replace it and report again...

[Gin+]

The engine stuff can be sorted out with a little patience and research. The transmission on the other hand is probably where your going to run into real issues. The p0811 and your “freewheeling” description would be a red flag to me suggesting internal damage or lack of fluid. The p0706 is basically telling you the tcu is having an issue sensing what gear you have selected, usually it’s the “range sensor” has gone defective. The horse kick when you put it in reverse (depending on how severe) could be a sign of “emgergancy mode” from the p0706 code or an issue with the valve body or solenoid. The tcu could still be a cause of some of that but the freewheeling is really conserning. You could pull the pan, inspect, change fluid but I wouldn’t expect much and it’s a lot of effort.

Personally, I’d start looking for a used transmission while sorting out the engine.

[Mike.G]

I've actually been parking the car basically making sure that whenever I have to leave I don't have to put into reverse but just into D instead and go.
Until just recently when me and my wife were looking for something for her Laptop and as we were in a hurry I wasn't thinking and I just parked the car nose first. When we had to leave we realized what I've done. And yet, after I started the car, I put it into R and the kick wasn't as bad as I remember and the car reversed very smoothly.
I guess what I'm trying to say is the kick wasn't as bad as I remember it.
Yeah engine wise I'm pretty confident that I'll be able to fix it in a matter of weeks (1 month at most) which also depends on the speed of the delivery of my parts.
The transmission right now is the real concern and I'm hoping that is something that I can fix.
As for the tranny range sensor I'm gonna take the wheel and brake of this weekend and give it a look just to make sure that it's clean. I've heard stories of people who just had to clean it and it ended up working like new.

[Gin+]

If you had vcds, you could test the different positions of the shift lever. Also, if the gear selection indicator on the gauge cluster is "inverted" then the tcu is in emergency mode.

[Mike.G]

So I just replaced my suction Jet it was a pretty easy process and now it looks like brand new.
The car seems to accelerate faster and the misfire is not as bad. But regardless there still is one.
The only question I have now is in regards to a new sound I hear when I accelerate. It's sounds like a short air release like a high pitched noise.
What could that be? After 3 seconds or something, it's gone.

Also when I was installing the hoses I didn't think about it until I was done, but is there a specific way in which the hoses have to be disconnected and reconnected again. Like an order or something or it doesn't matter?

[EuroxS4]

So I just replaced my suction Jet it was a pretty easy process and now it looks like brand new.
The car seems to accelerate faster and the misfire is not as bad. But regardless there still is one.
The only question I have now is in regards to a new sound I hear when I accelerate. It's sounds like a short air release like a high pitched noise.
What could that be? After 3 seconds or something, it's gone.

Also when I was installing the hoses I didn't think about it until I was done, but is there a specific way in which the hoses have to be disconnected and reconnected again. Like an order or something or it doesn't matter?

Sounds like you have slot going on.Id be checking for vacuum leaks for the misfire.Check you injector wiring harness.Also check to make sure you pcv is intact as it’s a common failure point.

In regards to the transmission it sounds like it’s either low on fluid or too far gone to save.This is why I avoid an audi with a automatic trans.Although their newer cars are much better when it comes to transmissions.


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[Mike.G]

I found an easy trick to check the PCV. Just run the car idle and take of the oil cap. If it makes a strong suction noise it's leaking, if there almost no resistance and no suction noise as I open it, it's fine. How reliable is this trick?

[EuroxS4]

theres a better way.If the car is running like shit at idle.There should be 2 hoses on the driver side near or under intake.clamp one of the hoses off and see if it the idle evens out.I dont remember which hose try both.one at a time.that is the correct way to test the pcv.

[tequilashots]

So I just replaced my suction Jet it was a pretty easy process and now it looks like brand new.
The car seems to accelerate faster and the misfire is not as bad. But regardless there still is one.
The only question I have now is in regards to a new sound I hear when I accelerate. It's sounds like a short air release like a high pitched noise.
What could that be? After 3 seconds or something, it's gone.

Also when I was installing the hoses I didn't think about it until I was done, but is there a specific way in which the hoses have to be disconnected and reconnected again. Like an order or something or it doesn't matter?

Trying to replace my own suction jet.

Any pics for the process, or a page with step by step instructions?

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[jpulll]

Trying to replace my own suction jet.

Any pics for the process, or a page with step by step instructions?

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It’s pretty easy. The hardest part will be removing the one-time use clamps. Either snip them or wrestle them with screw drivers.

SJP is at the rear of the intake manifold. Basically disconnect hoses, remove SJP, install new one, reconnect hoses with new clamps. Done.


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[Mike.G]

I have finally gotten rid of the misfire. The first injector was what caused it so replacing it fixed the problem. Of course now I'm still left with the transmission sensor and the clutch slippage. That might be a sign of a failing tranny so I'll just take it to a mechanic for that.

What I'm curious about now tho, is this white smoke coming out of my exhaust. It's a weird situation because it's not always there. It takes about 20min of driving for the smoke to start appearing. It's not really dense, doesn't smell bad like fuel or oil. But the oil warning keeps popping up on my dash board. After the checking it tho, it's still there at optimal levels. Also I might add, I usually drive from my town to the nearest one for groceries, work and so on. That takes about 20min of driving and once I get to a light and the car is idling, the smoke starts to appear.

Any idea what that could be?

[CyberPMG]

Is it an oil level warning or an oil temperature warning? The B6 cluster only shows the coolant temperature and not the oil temperature. If it's an oil level warning, the oil level sensor may be going bad and needing replaced.

White smoke would be more indicative of coolant burning than oil (would be blue/black). Could be the coolant line to the turbo has a leak or some other coolant leak that's allowing coolant into the engine. Check connections and gaskets for signs of any leaks.

As for the transmission, you might want to consider doing a fluid flush and fill to see if that addresses the problem first before diving into a rebuild/replacement.

[Mike.G]

Is there a link or something to a guide on how to do the tranny fluid flush & fill? I've never done it before and I really don't want to mess it up.

[tequilashots]

Is there a link or something to a guide on how to do the tranny fluid flush & fill? I've never done it before and I really don't want to mess it up.

For sure, I hope this helps.

Knowledge Is power

https://www.pelicanparts.com/techart...eplacement.htm

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[Mike.G]

For sure, I hope this helps.

Knowledge Is power

https://www.pelicanparts.com/techart...eplacement.htm

Sent from my SM-G955U using Audizine mobile app

Great thank you :) have you managed to replace your suction jet?


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[RAUDI-Ä4]

Hello, I am having similar problems with my b6 1.8t. I got a P0262: Cylinder 1 injector circuit high, P0301: Cylinder 1 misfire detected, P0411 Secondary air injection system incorrect flow detected, and catalyst system efficiency below threshold bank 1. I was doing some research and narrowed it down to the fuel injector wires. Could not find a link to buy one anywhere online, I know there is a thread on here where a guy made his own with new wires and pinning them into the harness connector. is there any way to buy a full wiring harness or should I look for some part outs. The car has a rough idle you can tell there is a misfire, very slow acceleration and if you step on the gas too fast it makes a weird popping noise from the exhaust but it is fast like a machine gun. But I can get her up to speed on the highway if I accelerate slowly ( which is why I believe it is the injection wires).

[jpulll]

Hello, I am having similar problems with my b6 1.8t. I got a P0262: Cylinder 1 injector circuit high, P0301: Cylinder 1 misfire detected, P0411 Secondary air injection system incorrect flow detected, and catalyst system efficiency below threshold bank 1. I was doing some research and narrowed it down to the fuel injector wires. Could not find a link to buy one anywhere online, I know there is a thread on here where a guy made his own with new wires and pinning them into the harness connector. is there any way to buy a full wiring harness or should I look for some part outs. The car has a rough idle you can tell there is a misfire, very slow acceleration and if you step on the gas too fast it makes a weird popping noise from the exhaust but it is fast like a machine gun. But I can get her up to speed on the highway if I accelerate slowly ( which is why I believe it is the injection wires).

There isn’t an injector harness, that I know of, that is produced commercially.

I got my connectors which included 6 inch pigtails from https://www.diyautotune.com/product/...ils-bosch-ev1/. Click the link and it’ll take you directly to the page you need.


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[RAUDI-Ä4]

I believe you are correct, i could not find a manufactured harness anywhere, do you think the problem is the wires as well? i am meeting a guy tomorrow who is parting out a b6 a4 so hopefully they are in good shape

[jpulll]

I believe you are correct, i could not find a manufactured harness anywhere, do you think the problem is the wires as well? i am meeting a guy tomorrow who is parting out a b6 a4 so hopefully they are in good shape

The wires usually short out right at the connector, underneath the rubber boot.


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