[s-cars] Help with codes- Bucking continued

Tue Mar 30 23:31:02 EST 2004

I drive by 93 now.
Some stations label there premium as 91.. for god sakes :)

Mark
----- Original Message ----- 
From: "Mike Sylvester" <msylvester at verizon.net>
To: "Bob DG" <bobS6 at msn.com>; "s-car-list" <s-car-list at audifans.com>
Sent: Tuesday, March 30, 2004 11:27 PM
Subject: Re: [s-cars] Help with codes- Bucking continued

> Bob,
> I don't know that the 94 fixed your problem, but what are you saving by
> running 93 or 91?  10 cents a gallon? $2.00 a tank?
> If that allowed you to get a little more timing advance or bump the boost
a
> few psi it would be a pretty inexpensive upgrade.
>
> If every station had 94 I wouldn't buy anything else, they don't so I have
> to settle for 93.  I don't fool around with anything less.  Some might say
> the car doesn't need it,
> but for $100 a year why take the chance.
>
> Mike
>
>
> ----- Original Message ----- 
> From: "Bob DG" <bobS6 at msn.com>
> To: "s-car-list" <s-car-list at audifans.com>
> Sent: Tuesday, March 30, 2004 9:20 PM
> Subject: Re: [s-cars] Help with codes- Bucking continued
>
>
> So to update the list on my bucking at high boost levels/max air pressure
> exceeded code- I thought I'd try a couple of tanks of Sunoco 94  octane.
> Since then I have had NO bucking/hesitation. Is my problem really that
> intermittent or am I going to have to keep spending $2.00 a gallon??????
FYI
> car has Lehmann stage 3, RS2 manifold + turbo, Stromung, FMIC.
>
> ----- Original Message -----
> From: chris chambers
> Sent: Friday, March 19, 2004 9:15 PM
> To: Bob DG; s-car-list
> Subject: Re: [s-cars] Help with codes
>
> Bob,
>
> Sounds exactly like what I had...and it was intermittent.
> Accelerate fast and it happens, accelerate slowly and it doesn't.
> Cleaning the contacts only helps if it is dirty contacts on the MAF or
> the connector, Could be a bad MAF...:o(
>
> Do you have anyone near you that you can swap MAF's with to see if that
> solves it?
>
> Good luck
>
> HTH
> Chris
> --- Bob DG <bobS6 at msn.com> wrote:
> > 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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