2nd Generation Specific 1986-1992 Discussion

Flat Spot When Secondaries Open

Old 02-22-2005, 12:59 PM
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I've noticed a slight flat spot when the secondaries open on my NA, once I get by it comes alive.



Definetely smells a bit rich, but I don't know why that would be the case.



Any ideas?
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Old 02-22-2005, 01:57 PM
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dreaded 3800 rpm stumble?
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Old 02-22-2005, 02:01 PM
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Originally Posted by Baldy' date='Feb 22 2005, 02:57 PM
dreaded 3800 rpm stumble?



Hmm, yea I'm gonna say so.
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Old 02-22-2005, 02:09 PM
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Thought we had an FAQ, but can't find it.



It smooths out after the flat spot and like I said I can smell fuel, so I'm guessing it's not an injector issue.
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Old 02-22-2005, 02:14 PM
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When I first got my coupe, I had that problem. I don't have that problem now, but I'm not sure what fixed it. I cleaned up my aux. ports, made sure the actuators functioned properly, had my injectors cleaned, and I've cleaned up my grounds (all done at different times, while doing other modifications).
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Old 02-22-2005, 02:16 PM
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Yea, I am leaning towards it being grounds in this case. The injectors were cleaned when the engine was rebuilt, either a ground was missed somewhere or it's just bad.
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Old 02-22-2005, 05:14 PM
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Doing a regroundig is one of the best things ive done for my car yet, thats probably the problem.
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Old 02-22-2005, 07:54 PM
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you would also need to address grounding the ecu better for the 3800rpm stumble, adding bunch of grounds to the engine isnt the trick for that
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Old 02-22-2005, 08:53 PM
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I think I have found the root of this issue, on all past rx7's, on the harness that goes to the alternator and various other areas, there is a flat grounding strap that comes out of it.



I was unable to find the strap connected, however I did find what appears to be a torn off end of it.



Ran it directly to ground, even though I believe previously it went to the block.



I will do some road testing tomorrow and see what's up.
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Old 02-22-2005, 09:41 PM
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Not to thread jack, but whats a good way to ground the ECU, I really should do it.
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