Re[2]: HOT Start Problem Still UN- Resolved..FD???? 86,5KCST

[gabel@acmepower.com (Glen Abel)]

    Brett, I have done another thing... lets say the car does not start..k? 
     I HOTWIRE (JUMP OUT RELAY) to the fuel pump, the think is running, and 
running,,,, for 15 to 20 sec... Why would it not start THEN???? The gauge says 
the pressure as at the FD... Its just not making it to the injectors.

In doing this I just dont buy the check valve theory.


______________________________ Reply Separator _________________________________
Subject: Re: HOT Start Problem Still UN- Resolved..FD???? 86,5KCSTQ
Author:  Brett N Augsburger <augsbbn@Eng.Auburn.EDU> at Internet
Date:    11/13/97 11:04 AM


On Thu, 13 Nov 1997, Glen Abel wrote:
     
>      OK I was almost positive that new injectors would do the trick. NOT 
>      SO! The guy at the Audi shop was telling me my problems before I could 
>      get the words out of my mouth. He said you need injectors and sounded 
>      SO confident that I look no further and just bought em'.  
>      
Sounds like a typical mechanic! Replace the most expensive things first 
and be sure not to properly diagnose the car. Then you can hit the 
customer up for more new parts until the actual faulty part is found! Then 
tell the customer "Each part I replaced contributed to the problem."
     
>      Anyway we are now down to one of two things, Fuel Dist, and/or bypass 
>      valve.  Lets eliminate fuel pump, check valve. The pressure is there! 
     
Hold on a second! Have you checked the pressure when hot? You would have 
to leave the gage on while it warmed up. Your symptoms point directly to a 
check valve. It also is not an expensive part compared to injectors!
     
>      and how! The problem is that the Throttle plate is not picking up when 
>      started hot... I can take the air cleaner off bring the car up to 
>      temp, and get it so that it doesn't start and all I have to do to get 
>      it to start is lift the plate, Now I know there's vacuum there, enough 
>      to lift the plate, but In a hot condition something is telling the 
>      Fuel Distributor not to provide fuel. Is it sticking? I tried Jamming 
     
Very doubtful that the FD plate is sticking. When the plate is lifted it 
allows the fuel plunger thingie to drop, it does not apply pressure. 
Therefore, the only way it would stick is if the bearing mechanism stuck 
and in such a case it would do so in all conditions.
     
>      a plug in the top of the air boot (Commonly referred to as "MR PEANUT" 
>      by my ex-girlfriend)  and it did start but still sputtered. 
>      
     
Again, typical of a check valve.
     
>      ANYBODY BTDT??? Its thermally related...... Why ???? I need a better 
>      book!!! 
> 
CHECK VALVE, CHECK VALVE, CHECK VALVE!
     
(No promise, but _highly_ likely!)
     
Brett Augsburger
'86 5kcstq