Still Rich - ideas???

[Bernie Benz]

The ECU with O2 feedback should be able to handle small differences  
in fuel pressure, but if the regulator is stuck open, full dead head  
pump pressure and not relieving back to the tank, could cause an  
apparent injector problem.

Bernie


On Jan 15, 2008, at 2:43 PM, Brandon Rogers wrote:

> Good points about the injectors, Bernie.  Of course my problem is also
> that the car was rich before having RC rebuild them - and it's still
> rich - so I guess I was thinking injectors just isn't the issue....
>
> But that said I do have a local friend who has a set of 15k mile 3B
> injectors I can borrow - and I will.
>
> One thing I forgot to mention is that I should probably check fuel
> pressure, too, right?  Even tho it is a 2 year old (6000 miles?) FPR.
>
> Thanks much for the input - any more thoughts guys?
>
> Brandon
>
>
>
> -----Original Message-----
> From: Bernie Benz [mailto:b.benz at charter.net]
> Sent: Tuesday, January 15, 2008 3:09 PM
> To: Brandon Rogers
> Cc: 200q20V mailing list
> Subject: Re: Still Rich - ideas???
>
>
> Brandon,
>
> Sounds like you're relying on rebuilt and tested injectors as being
> good, without further proof?
> Could be injectors leaking, not shutting off tightly. Have you talked
> with RC about this possibility? Do you have another set to try? After
> idling for some time do all plugs all look the same? All or some wet
> with gas? Gas in the oil?
>
> Bernie
>
> On Jan 15, 2008, at 1:19 PM, Brandon Rogers wrote:
>
>> My exhaust, not my bank account that is.....
>>
>> So anyway still chasing a rich idle and or decel condition.  As a
>> reminder, here's the situation:
>>
>> Car is a 1984 urquattro with 3B conversion.  It has been rich since
>> the
>> motor swap 4.5 yrs ago.  It passes Colorado's tough rolling road
>> emissions so I think it runs fine under load - its idle and decel
>> that I
>> think are messed up.  While driving and I come to a stop with windows
>> down, a very rich exhaust smell wafts into the cabin pretty much  
>> every
>> time - it is strong enough to become a real annoyance - and I know
>> something just ain't right.  The exhaust is just plain rich when
>> idling
>> - When I park, the air around the car is rich exhaust.  If I drive to
>> the store (1 mile) with windows down by the time I get back my  
>> clothes
>> smell - the wifey usually comments, "you drive the red car to the
>> store?"  "Yep."
>>
>> So so far:
>> - No Codes
>>
>> - swapped _back_ in the new 02 sensor I installed during the motor
>> swap
>> - I had swapped it out 3 years ago for the old one chasing the rich
>> running.  No change either time.
>>
>> - swapped in a bone stock ECU - no change
>>
>> - swapped in 2 different MAFs - one a 3B one an RS2 - no change
>>
>> - replaced the temp sender in back of head - no change
>>
>> - replaced the FPR (2 yrs ago) - no change
>>
>> - pressure tested for boost leaks numerous times
>>
>> - had injectors serviced by RC Engineering
>>
>> - swapped in a known good TPS - no change
>>
>> - removed Idle Stabilizer and thoroughly sprayed with throttle body
>> cleaner
>>
>> The one thing is that I should check is the wiring for the Temp  
>> Sender
>
>> on the back of the head.  I don't think the MFTS has an effect but
>> maybe
>> I'm wrong.  MFTS was new at swap - and remember it's been rich the
>> whole
>> time.  At least I don't recall it ever not being rich....
>>
>> Can anybody think of anything else??????  This is driving me nuts.
>>
>> TIA-
>>
>> Brandon
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