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Re: '85 ur-q Cold Start Problem
-- [ From: human * EMC.Ver #2.5.02 ] --
> Does this sound like the warm up regulator? regards, Mike
It sounds *exactly* like the warm up regulator. But I thought a sensor and
the ECU handled that function in cars newer than 82/83 or so? Well, anyway,
if you do have one, (it's that thing on the side of the engine block that
two fuel lines go to) I would be almost certain that's the problem.
The warm up regulator is block temperature sensitive and uses gasoline as a
hydraulic fluid to adjust the fuel pressure to the injectors. So all it
does is enrich the mixture - a lot - when the engine is cold. It's function
can be tested with a set of fuel pressure gauges - wish I could remember the
specs, but you install the gauge set up into the engine and measure the
regulator's output from cold through warm. I think it's supposed to drop
from about 50 psi to about 12 or so (memory glands weak).
Anyway, your symptoms are exactly what I have experienced twice with bad WU
reg's. They're expensive, but used ones work. I even ran a Volvo one my
neighbor gave me once. Worked fine! same Bosch casting, but it was "upside
down". They're easy to change. - two banjo bolts, one electrical connector
and two vacuum lines of different sizes. Check all your vacuum lines for
quality while you're at it.
Hope I helped.
Under the wrench: 82ish Coupe (glub glub) 73 F250 "rust never sleeps"
Outstanding in their field: 80 5k, 81 5kt, 87 5ks (royal blood)
so what am I driving? ugh.
7 Kelsey Road
Lee NH 03824