I've got a customer with a '87 5.0 on my dyno right now. He came in running very rich, and he lowered his fuel pressure. The A/F is good right now. He got his best power at 246, but then the power started dropping like crazy (246, 225, 196) even though he wasn't making any more changes. I thought the distributor might be slipping, that wasn't the case. I had him pull some plugs. They look like this:
The richness obviously explains the soot, but what about that corroded spot? Is it arcing there? Any explanations for the dramatic loss in power?
They're gapped at .040, and I realize they should be a little more, but I can't believe that would have a major effect.
The richness obviously explains the soot, but what about that corroded spot? Is it arcing there? Any explanations for the dramatic loss in power?
They're gapped at .040, and I realize they should be a little more, but I can't believe that would have a major effect.