Went to my mechanic with an intermittent stalling problem on my 1973
504 injection. It felt like fuel starvation and I suspected some
sort of obstruction in the fuel line. He did a cold cylinder
compression test which showed 125psi for cylinders 1 and 4, and
120psi for 2 and 3. (I know the engine is supposed to be warm when
testing for compression.) This is what they did: Cleaned out the
gas tank, replaced the fuel filters, back and front, adjusted the
valves, changed oil and filter, replaced spark plugs and ignition
wires, and checked timing and fuel and oil pressures. They did an
exhaust analysis and compression testing after the engine warmed
up. Cylinder 1, 120psi; cylinder 2, 125psi; cylinders 3 and 4,
100psi. This left me scratching my head because the compression
should have gone up, not down, with the warm engine and left me
suspecting a valve adjustment screw-up. Could it be anything else?
Fuel pressure was good at 3psi (spec 1-2.5psi) and oil pressure was
also good at 3.5psi at 3000 rpm's. Emissions analysis was dismal--
11 percent CO, about 1000ppm HC, 6.5 percent CO2. The car has the
two-liter engine with a Kugelfischer mechanical fuel injection,
which the mechanics here do not know how to adjust. I have a very
complex procedure from the Peugeot manual, involving thermometers,
mirrors and cooling water, which caused them to run in the opposite
direction. Nobody that I know here has the fuel injector cleaning
apparatus for this particular model, but the previous owner claims
that he replaced the fuel injectors and had the injection system
adjusted 15,000 miles ago. The other thing that I noticed is that
the electrovalve (some sort of a fifth injector that works as a
choke for cold starts) had an outside seam leak and was dripping
fuel outside the intake, and the inside head was full of carbon. I
have not been able to find a replacement, so I coated the outside,
where it was leaking, with metal epoxy until I can find a
replacement, and that sort of mitigated the problem. By the way,
the old spark plugs that I took out were extremely sooty, indicating
that the mixture has been rich for quite a while. If anybody can
offer any suggestions or explanation, I will very much appreciate it.
Thanos Karydas
1997 106 Rallye
1973 504 XN2
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Received on Thu Jul 14 11:04:54 2005
