CIS-E DPR

[Cody Forbes]

"Spare" fuse was the warmup problem. Now it fires right up and runs decent. Disconnecting the DPR with the engine cold and idling now causes it stall. 

-Cody Forbes (mobile)

> On Dec 30, 2015, at 11:28 PM, Huw Powell <audi at humanspeakers.com> wrote:
> 
> That is really only true of the "hybrid" we called "cis-turbo".
> 
> The (later - my 83 5kt was straight cis) turbocharged systems are far more finicky of parameters than their naturally aspirated stablemates.
> 
> Still good info, though!
> 
> (and thanks, blush)
> 
>> On 12/30/2015 10:56 PM, dgraber460 at aol.com wrote:
>> Also don't forget the sage advice of the late Phil Payne;
>> For CIS there are 3 CRITICAL factors that must be precisely in spec
>> 1 fuel pressure
>> 2 fuel pressure
>> and most importantly
>> 3 fuel pressure!
>> I drove my URQ for months with the FP gauge connected under the hood
>> while I dialed it in.
>> The DPR has an adjustment screw on the bottom under the brass plug. If
>> you can get cold pressure set but not full warm pressure or vice versa,
>> you might need to take the regulator apart and adjust that screw to get
>> the 2 end points in range. At 5,280 ft altitude I spent months adjusting
>> the pressure. AND - Don't forget the hex bolt on the lower side of the
>> fuel distributor with it's internal piston and shims.
>> Daunting task! Good luck.
>> Cody - as a pro you probably already know all that, but thought I'd
>> throw it in for any others that might be fighting the same battle.
>> I must say that had it not been for Huw and Phil, I would not have stuck
>> with URQ ownership as long as I did. They solved my problems answered my
>> questions and "talked me off the ledge" time after time.
>> 
>> Dennis
>> Denver
>> 
>> 
>> -----Original Message-----
>> From: Cody Forbes <cody at 5000tq.com>
>> To: audi <audi at humanspeakers.com>
>> Cc: quattro <quattro at audifans.com>
>> Sent: Wed, Dec 30, 2015 11:56 am
>> Subject: Re: CIS-E DPR
>> 
>> I'm going to buy you a tee shirt that says "CHECK THE "SPARE" FUSE, lol.
>> Then I'm going to buy one for myself so I remember it ;-).
>> 
>> -Cody Forbes (mobile)
>> 
>>>> On Dec 30, 2015, at 1:21 AM, Huw Powell <audi at humanspeakers.com>
>>> wrote:
>>> 
>>> Oh yeah, I'm sure you checked the "spare" fuse, right?
>>> 
>>> And remember, CIS had a purely mechanical version.  It will work with
>> no working electronics at all (E won't start well though).
>>> 
>>>> On 12/29/2015 11:32 PM, Cody Forbes wrote:
>>>> Quick question since I'm fluent in CIS, but not -E. Is it safe to
>> presume that disconnecting the electrical connector from the DPR with
>> the engine running should have a noticeable effect?
>>>> 
>>>> I haven't made up a DPR adjustment wiring harness yet. I just
>> finished replacing all of the injector seals after they failed a smoke
>> machine test miserably, but while certainly A problem, that wasn't THE
>> problem. Just as a quick check I disconnected the DPR and it made zero
>> difference in the idle. The engine is lean. For testing purposes I
>> cranked the metering plate adjustment screw to get it to run well enough
>> to establish a good idle (and recorded the change). Again tried
>> disconnecting the DPR and no change. This is on a cold engine. I have
>> already pulled the DPR and checked its screens which were clean as new.
>>>> 
>>>> Thursday I'll make a harness and check the current, but in the
>> meantime this info will help me gather my thoughts.
>>>> 
>>>> -Cody Forbes (mobile)
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>> 
>>