[s-cars] Fuel Injector Problems

[Mark Strangways]

How's your FPR ?

Mark
----- Original Message ----- 
From: <calvinlc at earthlink.net>
To: "Mark Strangways" <Strangconst at rogers.com>; <s-car-list at audifans.com>
Sent: Tuesday, October 18, 2005 11:39 PM
Subject: Re: [s-cars] Fuel Injector Problems


>A quick update.  I took out the new injector and sprayed it with Gumout.
> After placing it back into the fuel rail this immediately caused the car 
> to
> run worlds better as well as maintaining the fuel pressure in the rail for 
> a
> longer period of time...many minutes above 20 psi vs. a few seconds.  This
> leads me to believe that the rich running condition is fouling the
> injectors.  It is also doing so in very short order because after letting 
> it
> idle for maybe a total of 40 minutes the fuel pressure bleeds off 
> noticeably
> quicker...not the rate it was doing before the gumout treatment but it is
> definitely quicker.
>
> What in the heck could be causing such a rich condition?  I put the O2
> sensor on the oscilliscope and it is only changing from rich to lean about
> once every 4-5 seconds at idle.  The car also tries to initially bog when 
> I
> give it gas in neutral.  Does this sound like a possible O2 sensor issue? 
> I
> mean it must be REALLY rich to be doing this.
>
> Should I just replace the O2 sensor and find out?  Do you guys recommend 
> the
> universal splice in type or the harnessed up type that is like twice as
> much?
>
> Thanks!
>
> --Calvin
>
>
> -----Original Message-----
> From: Mark Strangways [mailto:Strangconst at rogers.com]
> Sent: Tuesday, October 18, 2005 6:39 PM
> To: calvinlc at earthlink.net; s-car-list at audifans.com
> Subject: Re: [s-cars] Fuel Injector Problems
>
>
> Can U find a spare ecu for that model ?
> Maybe the ECU is locking up with impedance problems?
>
> Do they hold pressure ok disconnected electrically ?
> Maybe it's all just coincidental ?
>
> Mark
> ----- Original Message -----
> From: <calvinlc at earthlink.net>
> To: <s-car-list at audifans.com>
> Sent: Tuesday, October 18, 2005 8:28 PM
> Subject: [s-cars] Fuel Injector Problems
>
>
>> OK guys.  This one has got me totally puzzled.  This is on a '91 200 20
>> valve but all experience here is applicable.  I have a problem earlier
>> this
>> summer where an injector was "hung open."  i.e. it was allowing fuel to
>> seep
>> through even after the ignition had been shut off.  I replaced the
>> injector
>> with a new one.  Now the new one is having the same problem not more than
>> 40
>> miles later.  All the cylinders are showing signs of running rich.  Is it
>> possible that they are running so rich that the fuel injectors are 
>> getting
>> clogged so badly that they are "hanging open"???  Has anybody got any
>> ideas.
>> BTW, through some wierd coincidences the injectors, the old bad one and
>> the
>> "new" bad one were in two different cylinders, 4 & 5.  I am at my wits 
>> end
>> and getting tired of working on this thing.  It has been down for almost
>> two
>> months due to this problem!  Thanks for any help!
>> --Calvin
>>
>>
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>
>
>
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