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Originally Posted by XfireZ51
I'm willing to bet that the fluctuation is due to the fact the VSS sensor doesn't have a solid signal ground. Its probably jumping to the power ground.
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I'm not following here Dominic...
VSS (as now wired), doesn't have a dedicated ground? Or the DD needs another ground? Or just 2 better connections? (which I'm about to do)
Do I need to trace the leads from the VSS, from the case connector???
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I had this happen once when TPS sensor was connected to my WB so I could see TPS% as part of WB O2 datalog. Worked great until one day it didn't. TPS was all over the place. Needless to say motor ran like crap. Until I removed the TPS signal from the WB and then everything worked. I was using power ground for the signal ground. Didn't like that. Needs to be separate which is why ECM has separate sensor grounds from power grounds. Each sensor needs a reference ground along w reference signal. Some sensors may share.
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