jens94850 Posted January 30, 2006 Report Share Posted January 30, 2006 I posted this at Turbo bricks (first post there) and thought I'd try it here. Never had to ask RWD help before....I have a 1988 740 turbo wagon that I recently acquired with a rich running condition. I've worked on these for a while, so I figured it would be an easy fix. It's got some miles on it so I replaced/went over all the common culprits. Cleaned PCV nipple, checked all vacuum hoses (replaced a few). replaced two intercooler lines, new ECT sensor, new FPR, new O2 sensor, new plugs and coil wire. Still, the car runs a little rich, worse at hot idle. All grounds are good for motor. All four injectors are ticking like they work. I also tried adjusting the richness out of the 007--not enough adjustment available to clear it up.The problem is not huge, it is a slight rich smell with a idle miss every 2-3 seconds at hot idle and in gear--also enough that the car would fail emissions.Finally I went through the entire Chilton's manual diagnostic at the ECU, AMM and injectors.The only discrepencies were these:1.) AMM gets .5v less than battery when checked at AMM terminals 1 and 5. 2.) AMM shows 3.0 ohms at AMM terminals 6 and 7 (specs say it should be 3.7 ohms.3.) Injectors uniformly showed 2.5-2.6 ohms accross the leads (book said approximately 16 at cold--car had been run about one hour previous to tests.)I am frustrated...usually I would have it fixed in an hour...but I am also past my level of certainty....Is any one of those three things enough to cause the richness?I think the injectors are not the problem as they tick normally and are uniform in reistance. So, is the 3.0 instead of 3.7 ohms the culprit? I have never known an AMM to cause just a slight rich situation (car runs fine with plenty of power, but is always a bit rich). Usually there are other problems....I've spent a bit on parts already. I'd like to be sure before shelling out the $$$ for an AMM. Thanks. Link to comment Share on other sites More sharing options...
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