Looking for help on a CIS problem. I have a 1983 Modial 4v U.S. version. The car had not been driven for a while. I have replaced the fuel distributor with a rebuilt unit, changed the spark plugs, distributor rotors and caps spark plug wires and fuel filter. The problem is that the car starts but after 15-20 seconds the idle goes up to 3000 rpm and stays there until the throttle is snapped. then the idle goes down to about 500 rpm and the car stalls. The car is running rich since the spark plugs are getting black and you could smell the exhaust. here is what I have tried so far. 1. tested for spark at both banks, spark is present. 2. tested TDC sensors and RPM sensors. All okay 3. Disonnected cold start injector and warm up regulator-NO change. 4. Measured system fuel pressure at fuel distributor inlet--95-100 psi!!!!! Which I believe is too high. 5. Measured gas volume at return line with key on engine off -- Volume is 700ml/30 seconds 6. Tried to lean mixture with fuel distributor adjustment screw, still no change. 7. Checked return line and feed line for any obstruction, found none.
Until you get the regulated supply pressure down, and the amount of fuel returned up during the fuel return test up, it doesn't make sense IMO to be attempting mixture adjustments. Can you give a little more background on your status: 1. Is the "rebuilt" FD the same FD that you had before the rebuid? Do you know if the rebuilder confirmed the regulated supply pressure on his/her test set-up? The good news is that your results do match having an improperly adjusted (or malfunctioning) pressure regulator (i.e., at a higher pressure, less fuel would be returned), but the bad news is that it seems way, way off. Do you have the option to return the rebuilt FD to the rebuilder to confirm/deny the pressure regulator adjustment? 2. Did you have the same "supply pressure too high" problem on the "before rebuid FD" and the "after rebuild FD"? 3. Even though the regulated supply pressure is obviously wacky (if you can trust your gauge ), have you also measured the control pressure? Is it a reasonable value (e.g., something below the regulated supply pressure as expected) or a non-reasonable value (e.g., same as the regulated supply pressure)? PS An '83 US MondialQV has a cold start air valve that should cause the cold start idle to go to something (crazy ) like 3000 RPM so this is quasi-normal -- unless you've already disabled it.
