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Re: Poor low end perf. when cold 700 89

posted by  someone claiming to be John Sargent on  Tue Nov 21 12:06 CST 2000 [RELATED]

You might also check the coolant temperature sensor. To do this, remove the wiring harness from the fuel injection control unit. Take the wire harness connector out of it's housing by removing the screw at the bottom and pushing on the wires. Find terminal 2 (which is connected to the coolant temperature sensor), and connect an ohm meter betwen it and ground. The resistance of the coolant temperature varies according to temperature according to a logarithmic chart, but you should have from 2,280 to 2,720 ohms at 68 degrees F., about 3,800 ohms at 50 degrees F., and about 330 ohms at 176 degrees F. The coolant temperature sensor is installed in the head and it is just under cylinder 3 intake port. To replace it, it is best to remove the intake manifold. I just replaced one in one of our three 740 turbo cars, and it made a big difference in the running and economy. It was about 9.5 meg ohms to ground at 50 degrees F. The car started okay, but it was a dog off the line, no torque at low rpm.





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