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PostPosted: Wed Jun 06, 2018 12:09 pm 
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Joined: Sun Aug 21, 2016 10:43 am
Posts: 227
Location: Germany
While chasing my drivability issues I checked the crank sensor on my car wiring too. Maybe it is of use for others so I share what I've found.

The crank sensor signal is very improtant but also very sensible as it is a low voltage signal (only caused by inductive effects) and changes with up to 5 kHz. Lotus uses a twisted pair cable but that's not enough signal protection. Better to use a high quality shielded cable and earth the shielding at one (!) end to the ground (preferable to sensor earth at the ECU side but engine ground will work too). Run the cable separately from the rest of the wiring. In the original loom it runs parallel to the injection and spark driving cables which cause a lot of noise input into that wiring. I routed a new cable via the fuel filler side from the sensor to the ECU to get a clean crank signal.

I've found older reports on this forum about the ECU speedo sensor not working properly which causes the 5500 rpm rev limit to cut in. The speedo sensor works with the same principle and is prone to signal disturbance as well. A shielded cable to this sensor has been reported to solve issues there too.


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PostPosted: Thu Jun 07, 2018 6:53 am 
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Joined: Tue Jul 13, 2004 12:50 pm
Posts: 3887
Location: Lancs
Congratulations..All a bit technical for me but I followed your progress with great interest.. Great result,


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PostPosted: Fri Jun 08, 2018 9:51 am 
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Joined: Sun Nov 20, 2016 8:40 am
Posts: 56
Location: Lincs
thommo wrote:
Congratulations..All a bit technical for me but I followed your progress with great interest.. Great result,



I once thought I want to build my own house (my dad was a master builder), I was not trained in this domain but, guess what? I did it.

Started in the foundation, then floor, then builder put the structure up (economics), I did the rest, piece by piece.

My point being, don't look at the whole thing, piece by piece most of us can do it, with help/time.

My car should of been finished at Christmas, time....


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PostPosted: Fri Jun 08, 2018 1:15 pm 
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Joined: Tue Jul 13, 2004 12:50 pm
Posts: 3887
Location: Lancs
Thanks for those kind thoughts . . .


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