[s-cars] Help with codes- Bucking continued

Tue Mar 30 22:03:09 EST 2004

Bob,

My problem was also intermittent...Just a repeat on my FYI, see if you
can swap MAF's with someone.

Chris

--- Bob DG <bobS6 at msn.com> wrote:
> 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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