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Old 12-18-2019, 09:23 PM   #26
vcolper
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By oscillating I meant the engine idle, not the dwell meter needle. The dwell stays pretty steady at 67.
the dwell isnt changing by adjusting the mixture with the ox sensor disconnected. When I connect it it doesnt change. doesnt default to 45 either
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1986 740T parts car, 1994 940 na, 1993 945T. 1991 940T(sold), 1992 940T(sold), 1991 240(sold), 1991 240 parts car, 1992 240 5sp parts car(sold), 1984 242 GLT SOLD, 1973 Triumph TR6 project(sold), 2003 Silverado Daily Driver
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Old 12-18-2019, 09:53 PM   #27
dl242gt
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Your dwell meter needle should oscillate but be centered around the numbers I mention. Staying at one location either means something like the o2 sensor is bad. It could also be that you have some wiring harness issues where something is grounded out or connected wrong. Are the two grounds on the intake manifold each going to a separate location? I mean the ones toward the rear of the intake manifold. They are grounds for the lambda controller and each have to go to a separate bolt on the manifold. Is terminal 7 grounded out all the time? That would make the engine rich and have a high dwell number. Might even be a bad lambda controller or an incorrect one on a car this old. There are only a few connections to check. You can go in the right kick panel and check the wiring on the connector to the computer. If you can find one a green book wiring diagram for your year is nice to have.
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Old 12-18-2019, 09:57 PM   #28
dl242gt
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BTW the most proper way to set the mixture is to disconnect the o2 sensor. Then set the mixture with a CO tester connected before the cat. There is a test port on the top of the stock down pipe for this. Once you have the mixture set proper mechanically. Then reconnect o2 and fine tune with the dwell meter. You may have to rev the engine for 30 seconds or so then idle and recheck to keep the o2 sensor hot.
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