Quote:
Originally Posted by Stretch
I'm a bit late to this party.
I assume this vehicle has been sitting for a while - as you mention "three year old gas"
Injectors are probably clogged and corroded. If you have a pop tester remove the injectors and see if they dribble / leak don't spray nicely. When working correctly these things stutter making a kind of a weird almost screeching noise. (Remember this is a CONTINUOUS injection system so they need to do this all the time)
The plunger for the fuel distributor also needs to be free and able to move nicely. The best way to check this is to remove it check visually for leaks and good motion. They can get a little sticky especially after sitting for a while.
The best thing you can do for the car is to chuck that old fuel - failing that use some sort of fuel stabiliser.
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As for messing about with the air flow potentiometer - well that might have been a bit of a mistake - they should read about 0.7 VDC between pins one and two at an idle of 800 rpm (ish). Problem is you need the good operating temperature - idle - and duty cycle for this to come good. So it can be a pain in the arse - very difficult to adjust this when you've got problems elsewhere on the engine.
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Let me clarify. The parts I pulled are off of a car that sat for three years. My car hasn't, I have been driving it for nearly two years. I have had a few parts fail before that I have replaced concerning the fuel and ignition system. It has new plugs (denso non-resistor), wires (NGK, seem to be better quality than Bosch), a good used distributor and rotor (seriously looked mint, Bosch & Beru), new injectors with deals and orings (Bosch), good used EHA, good used speedometer sensor, new oxygen sensor (Bosch). I also recently changed the entire fuel distributor/air plates assembly over because my air flow potentiometer was bad and I didn't want to mess with taking a known good one off and then having to get it adjusted correctly. This one was still at the factory set position. It also had the air plate adjustment at the factory position because the ball was still in the tower. Once I installed that, the engine ran better than ever before it started having the current issues.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.
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