[urq] urq Hot Start Issues

[Mike Sylvester]

Typically hot start issues with CIS are vacuum related. 
When cold, the cold start injector will fire, when warm it will not, so
if you have a vacuum leak there is not enough vacuum to lift the
throttle plate.  If the throttle plate doesn't lift the engine gets no
fuel.
You can demonstrate this on a normal running car by removing the oil
fill cap and try to start the car.  You get the same crank but no fire.

A way to prove this is the problem,if you have 2 people and a 3mm allen
wrench, insert it in the CO adjustment and when the engine is cranking
angle the wrench and lift up.  This will manually lift the throttle
plate and the engine will fire.

Mike

> -------- Original Message --------
> Subject: [urq]  urq Hot Start Issues
> From: Ken LiPani <mentosman42 at gmail.com>
> Date: Tue, February 18, 2014 3:59 pm
> To: urq at audifans.com
> 
> 
> I had similar problems when I purchased my URQ. Was waiting for a ferry
> after picking it up and as soon as the ferry arrived I went to start the
> car(after sitting for 10 mins) and it just cranked and didnt even sputter.
> After cranking it for a bit I was smelling the exhaust and didnt smell much
> fuel so I was thinking the fuel pump died or the fuel gauge is wrong and I
> ran it out of gas. Walked down the street and got a can and some gas from a
> station and put it in the car and the gauge went up a bit so I knew the
> gauge was good then went to start it and she fired right up. Made sure to
> keep her running all the way home.
> 
> As for what solved the problem, it was some combination of replacing the
> fuel lines, getting new injectors, new fuel accumulator, pulling
> apart/cleaning the fuel distributor, and replacing the pressure regulator
> on the side of the block(the thing with the two fuel lines going to it).
> 
> That pressure regulator is supposed to vary the fuel pressure depending on
> the vac/boost it sees(if I am remembering this correctly) so if you had a
> fuel pressure tester setup(basic CIS test kit) you could hook it up in line
> and rev the engine to different vac/boost levels and see what pressure you
> are getting out. Mine wasnt varying the pressure at all so I replaced
> it(there is a guy that actually rebuilds these).
> 
> 
> Hope this is some help.
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