2nd Generation Specific 1986-1992 Discussion

what wires directly from the computer of an 86 n/a do i ground

Old Nov 21, 2005 | 03:52 PM
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matts86fc3s's Avatar
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what ground wires on the computer do i splice in extra grounds for to help this problem? also what are the ground wires on the secondary injectors that i splice in extra grounds for?
Old Nov 21, 2005 | 09:19 PM
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There is a ground that goes from your wiring harness to the top of the one rotor housing under your upper intake manifold. That should help the problem.
Old Nov 21, 2005 | 10:09 PM
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from what part of the wiring harness??
Old Nov 22, 2005 | 08:58 AM
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If you are talking about splicing extra grounds into the ECU's wiring harness, the ground pins are 2C, 2R, 3A and 3G. What I did before I added these grounds was to test each one with my voltmeter. All should be reading -0- volts. All of mine were, so I didn't add any spliced grounds. If yours are showing a voltage reading other than 0, then you might benefit from adding a solid ground to the cars frame.
Old Nov 22, 2005 | 11:48 AM
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alright cool cool, how do i check wich pins are what tho? would they be lettered and numbered?
Old Nov 22, 2005 | 02:04 PM
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Unfortunately, the pins aren't lettered and numbered. That would be too easy. However, in the FSM in the section on Fuel and Emissions, there is a diagram that shows which pins are which.
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