Still Rich - ideas???

Bernie Benz b.benz at
Tue Jan 15 14:08:47 PST 2008


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?


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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