CIS gurus, please advise (tech)...

[open.seas at verizon.net (Chris)]

Initially sees like vapor lock, but if it sat for a day, that should 
have cured it.

Sticky Plunger? Isn't there a direct line of fuel to the cold start
injector? That could explain why the cold start injector had fuel, but
not the others. If I recall correctly, the plungers are matched to the
specific fuel distributor. That suggests that a tiny bit of debris could
mess up the FD. Maybe cleaning the plunger and its path might be one
thing to try.  That's my theory, anyway.

Chris

Allyn wrote:
> Fellow listers,
> 
> OK, so the Rieger is playing games with me as of late.
> 
> Background: A few months back, on a particularly hot day, wouldn't
> start after being shutdown hot for 5 minutes.  Gave an initial
> sputter but no continuous fire, suggesting there was some fuel, but
> not continuous.  After 10 more minutes of waiting, fired right up.
> Problem did not reappear until recently (below).
> 
> Problem: After filling up on gas (also a pretty hot day, a few weeks
> ago), no start.  Acting identical to last time (brief sputter as 
> cranking begins, but no complete start).  I let it sit for a day - no
> dice.  Have to pull 'er home from the base.  Weeks go by - still no
> dice.  I start troubleshooting:
> 
> - spark perfect (as suspected). - Cracking a fitting loose reveals
> cold start injector has full fuel pressure and flow supplied from
> fuel distributor. - Cracking an injector line fitting loose reveals
> no (0) fuel pressure or flow from the injector line outlet of the
> fuel distributor. - I crack the other 3 lines - same result. - With
> all 4 lines cracked, and the air flow sensor plate lifted, I cycle
> the fuel pump again - no flow.  I note that sensor plate does not
> appear to have 'normal' resistance to lifting (it has significantly
> less). - In this condition, I crack the cold start injector line
> again - plenty of pressure and flow. - I lower plate, secure fuel
> pump, allow all pressure to bleed away through cold start line.  I
> then lift the plate.  Doing so causes further fuel to come from the
> cracked fitting (from the top of the control plunger I assume - the
> volume seemed sufficient).
> 
> So... I'm thinking DPR, but I've honestly never seen one fail in such
> a manner.  It would have to have failed completely shut (or for some
> reason being given full reverse current from the controller), in
> order to cause these symptoms.  Is there some other path through the
> fuel distribution block that I should check on?  Any other imput here
> is welcome, as I intend to tear into it further in the morning.
> 
> Thanks in advance Al
> 
> 
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