[s-cars] Help with codes

[Bob DG]

Yes, violent loss of power. If I accelerate slowly- no probs. I cleaned the MAF connection contacts- didn't solve the problem. Again- it is intermittent. All MAF problems I have had were not intermittent.

----- Original Message -----
From: chris chambers
Sent: Friday, March 19, 2004 11:11 AM
To: Bob DG; s-car-list at audifans.com
Subject: Re: [s-cars] Help with codes


Bob,

by violent bucking do you mean under hard acceleration ~ 4k rpm's the
car "bucks" and feels like the engine lost all power? But if you
accelerate slowly you don't have the problem?

I had this problem, it wasn't an overboost problem but the MAF thinking
I was overboosting. It could be either a bad MAF or if you are lucky
like me it is a dirty connection at the MAF. What happens is becasue
the ECU thinks you are overboosting it cuts off the fuel.

Read here:

http://www.sjmautotechnik.com/20vboost.html#oboost

Here is a cut and paste:
Overboost Cutout? ECU fault code 2224?  


If you are encountering an overboost condition which is causing the ECU
to cut the fuel pump, and you have stored the 2224 ECU fault code, here
are some items to check out.  

You may have a leak in the boost hoses between the turbo exit
connection and the throttle body. If you have a hand pump or an air
compressor, you can make up an adapter to fit into the hose that
connects to the turbo inlet, and this will allow you to pressurize the
air from the turbo inlet, through the turbo exit hose, through the
intercooler, from the intercooler exit hose, and from the metal intake
pipe to the throttle body and check for any leaks. Use a pressure
regulator set to about 15psi if you are using an air compressor.  

You can also do a visual check of the turbo exit hose underneath the
car and look for any signs of oil leaking out of the turbo exit hose,
indicating a leak. Normally a small amount of oil vapors and mist are
sucked in by the turbo from the crankcase breather system, and this oil
mist will typically show up outside the hoses, or intercooler
connections if a pressure leak is occurring. Check and or replace the
ribbed intercooler exit hose as well, these often split open on the
bottom side, in-between the wire re-enforced rib areas, due to the
crankcase breather oil mist in the system. Removing the hoses and
inspecting them is also a good idea on high mileage engines.  

If you don't have any leaks in these hoses, check the vacuum/boost hose
that connects from the back of the intake manifold to the ECU inside
the car. See below for details. Engine Control Unit (ECU) Vacuum/Boost
Line

I have run across a couple of 20V Turbo cars which had a 2224 code
stored inside the ECU and were getting the overboost fuel pump cutout,
even though the boost was only going up to 1.0-1.2 bar. In the first
case this would occur only when the throttle was quickly floored, and
would not happen if the throttle was gradually opened all the way. In
the first case, it ended up being a defective MAF sensor. In the other
case it was only a poor connection at the MAF sensor. Try using some
contact cleaner on the MAF connector and terminals, and see if the
overboost problem is eliminated.  

HTH
Chris


--- Bob DG <bobs6 at msn.com> wrote:
> I had my codes pulled, something like "Max air pressure exceeded" or  
> something around those words. I was having an intermittent issue with
>  
> violent bucking under high boost pressure- I assume these things are  
> related? Car has Lehmann stage 3+, RS2 bits, FMIC.
>  
> Can someone point me in the right direction?
>  
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